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Blockage effects on viscous fluid flow and heat transfer past a magnetic obstacle in a duct 被引量:1
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作者 张喜东 黄护林 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期346-351,共6页
The effect of lateral walls on fluid flow and heat transfer is investigated when a fluid passes a magnetic obstacle. The blockage ratio β that represents the ratio between the width of external magnet M y and the spa... The effect of lateral walls on fluid flow and heat transfer is investigated when a fluid passes a magnetic obstacle. The blockage ratio β that represents the ratio between the width of external magnet M y and the spanwise width L y is employed to depict the effect. The finite volume method (FVM) based on the PISO algorithm is applied for the blockage ratios of 0.2, 0.3, and 0.4. The results show that the value of Strouhal number St increases as the blockage ratio β increases, and for small β , the variation of St is very small when the interaction parameter and Reynolds number are increasing. Moreover, the cross-stream mixing induced by the magnetic obstacle can enhance the wall-heat transfer and the maximum value of the overall heat transfer increment is about 50.5%. 展开更多
关键词 magnetic obstacle blockage ratio strouhal number heat transfer
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Aerodynamic effects on a railway tunnel with partially changed cross-sectional area 被引量:4
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作者 LI Wen-hui LIU Tang-hong +3 位作者 MARTINEZ-VAZQUEZ Pedro XIA Yu-tao CHEN Zheng-wei GUO Zi-jian 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2589-2604,共16页
The present study numerically explored the aerodynamic performance of a novel railway tunnel with a partially reduced cross-section.The impact of the reduction rate of the tunnel cross-section on wave transmissions wa... The present study numerically explored the aerodynamic performance of a novel railway tunnel with a partially reduced cross-section.The impact of the reduction rate of the tunnel cross-section on wave transmissions was analyzed based on the three-dimensional,unsteady,compressible,and RNG k-εturbulence model.The results highlight that the reduction rate(S)most affects pressure configurations at the middle tunnel segment,followed by the enlarged segments near access,and finally the exit.The strength of the newly generated compression wave at the tunnel junction where the cross-section abruptly changes increases exponentially with the decrease of the cross-sectional area.The maximum peak-to-peak pressureΔP on the tunnel and train surface for non-uniform tunnels is reduced by 10.7%and 13.8%,respectively,compared with those of equivalent uniform tunnels.Overall,the economic analysis suggests that the aerodynamic performance of the developed tunnel prototype surpasses those conventional tunnels based on the same excavated volume. 展开更多
关键词 high-speed train railway tunnel CROSS-SECTION transient pressure blockage ratio
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Aerodynamic Design of a Subsonic Evacuated Tube Train System 被引量:5
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作者 Tian Li Xiaohan Zhang +1 位作者 Yao Jiang Weihua Zhang 《Fluid Dynamics & Materials Processing》 EI 2020年第1期121-130,共10页
The so-called Evacuated Tube Train(ETT)is currently being proposed as a high-speed transportation system potentially competitive with airplane transportation.Aerodynamic resistance is one of the most crucial factors f... The so-called Evacuated Tube Train(ETT)is currently being proposed as a high-speed transportation system potentially competitive with airplane transportation.Aerodynamic resistance is one of the most crucial factors for the successful design of an ETT.In the present work,a three-dimensional concept ETT model has been elaborated.The aerodynamic characteristics of the subsonic ETT have been numerically simulated under different conditions.The train’s running speed varies from 600 km/h up to 1200 km/h,and the blockage ratio is in the range between 0.1 and 0.3.As the blocking ratio and running speed increase,the resistance of the head car increases greatly,while the resistance of the middle car changes slightly.The aerodynamic resistance of the tail car is affected by the shock wave emerging in the wake flow.Two different design criteria for the maximum allowed aerodynamic resistance are proposed for aerodynamic parameter matching.With an increase in the blockage ratio and running speed,the atmospheric pressure in the tube should be decreased to achieve a balance. 展开更多
关键词 Evacuated tube train aerodynamic resistance blockage ratio shock wave
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Shock wave mitigation using zig-zag structures and cylindrical obstructions 被引量:3
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作者 Arun Kumar R Vaibhav Pathak 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第6期1840-1851,共12页
The present study focuses on the mitigation of shock wave using novel geometric passages in the flow field.The strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstru... The present study focuses on the mitigation of shock wave using novel geometric passages in the flow field.The strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstruction,which in turn is expected to reduce the shock wave strength at the target location.In the present study the interaction of a plane shock front(generated from a shock tube)with various geometric designs such as,1)zig-zag geometric passage,2)staggered cylindrical obstructions and 3)zigzag passage with cylindrical obstructions have been investigated using computational technique.It is seen from the numerical simulation that,among the various designs,the maximum shock attenuation is produced by the zig-zag passage with cylindrical obstructions which is then followed by zig-zag passage and staggered cylindrical obstructions.A comprehensive investigation on the shock wave reflection and diffraction phenomena happening in the proposed complex passages have also been carried out.In the new zig-zag design,the initial shock wave undergoes shock wave reflection and diffraction process which swaps alternatively as the shock front moves from one turn to the other turn.This cyclic shock reflection and diffraction process helps in diffusing the shock wave energy with practically no obstruction to the flow field.It is found that by combining the shock attenuation ability of zig-zag passage(using shock reflection and diffraction)with the shock attenuation ability of cylindrical blocks(by flow obstruction),a drastic attenuation in shock strength can be achieved with moderate level of flow blocking. 展开更多
关键词 Blast wave mitigation blockage ratio Geometric obstructions Shock wave reflection and diffraction Zig-zag structure
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Numerical simulation and analysis of aerodynamic drag on a subsonic train in evacuated tube transportation 被引量:19
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作者 Yaoping ZHANG 《Journal of Modern Transportation》 2012年第1期44-48,共5页
The aerodynamic drag on a train running in an evacuated tube varies with tube air pressure, train speed and shape, as well as blockage ratio. This paper uses numerical simulations to study the effects of different fac... The aerodynamic drag on a train running in an evacuated tube varies with tube air pressure, train speed and shape, as well as blockage ratio. This paper uses numerical simulations to study the effects of different factors on the aerodynamic drag of a train running at subsonic speed in an evacuated tube. Firstly, we present the assumption of a steady state, two dimensional, incompressible viscous flow with lubricity wall conditions. Subsequently, based on the Navier-Stokes equation and the k-c turbulent models, we calculate the aerodynamic drag imposed on the column train with a 3-meter diameter running under different pressure and blockage ratio conditions in an evacuated tube transporta- tion (ETT) system. The simulation is performed with FLUENT 6.3 software package. An analyses of the simulation re- sults suggest that the blockage ratio for ETT should be in the range of 0.25-0.7, and the tube internal diameter in the range of 2-4 m, with the feasible vacuum pressure in the range of 1-10 000 Pa for the future subsonic ETT trains. 展开更多
关键词 subsonic train evacuated tube transportation aerodynamic drag blockage ratio
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Flame Propagation Characteristics of Propane-Air Mixture in Ducts with Obstacles 被引量:2
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作者 卢捷 王成 宁建国 《Journal of Beijing Institute of Technology》 EI CAS 2004年第4期394-397,共4页
An experimental study on acceleration mechanism of flame propagation of propane-air mixture in ducts with obstacles was conducted. The acceleration mechanism of flame propagation is mainly due to the positive feedback... An experimental study on acceleration mechanism of flame propagation of propane-air mixture in ducts with obstacles was conducted. The acceleration mechanism of flame propagation is mainly due to the positive feedback of the turbulence region induced by obstacles for combustion process. It can be seen from the experimental results that the maximum explosion pressure can increase by 20%, the maximum rate of pressure rise can increase by 10 times and the flame propagation velocity can increase by 20 times when obstacles are present. 展开更多
关键词 gas explosion propane-air mixture flame propagation blockage ratio
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Aerodynamic simulation of evacuated tube maglev trains with different streamlined designs 被引量:12
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作者 Xuyong CHEN Lifeng ZHAO +1 位作者 Jiaqing MA Yuansen LIU 《Journal of Modern Transportation》 2012年第2期115-120,共6页
Based on the Navier-Stokes (N-S) equations of incompressible viscous fluids and the standard k-ε turbu- lence model with assumptions of steady state and two dimensional conditions, a simulation of the aerodynamic d... Based on the Navier-Stokes (N-S) equations of incompressible viscous fluids and the standard k-ε turbu- lence model with assumptions of steady state and two dimensional conditions, a simulation of the aerodynamic drag on a maglev train in an evacuated tube was made with ANSYS/FLOTRAN software under different vacuum pressures, blockage ratios, and shapes of train head and tail. The pressure flow fields of the evacuated tube maglev train under different vacuum pressures were analyzed, and then compared under the same blockage ratio condition. The results show that the environmental pressure of 1 000 Pa in the tube is the best to achieve the effect of aerodynamic drag reduction, and there are no obvious differences in the aerodynamic drag reduction among different streamline head shapes. Overall, the blunt-shape tail and the blockage ratio of 0.25 are more efficient for drag reduction of the train at the tube pressure of 1 000 Pa. 展开更多
关键词 aerodynamic drag evacuated tube maglev train blockage ratio train head and tail
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Propagation velocity measurement for flame of gas explosion in horizontal tube 被引量:2
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作者 TAN Ying-xin HAN Yi 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2017年第1期21-26,共6页
In coal industry,gas explosion accidents emerge constantly,causing enormous casualties and poorer material property.In the course of studying gas exploding mechanism,the propagation velocity of the flame wave front is... In coal industry,gas explosion accidents emerge constantly,causing enormous casualties and poorer material property.In the course of studying gas exploding mechanism,the propagation velocity of the flame wave front is one of the most important factors.A set of flame velocity measuring system was designed according to the horizontal pipelined experimental facility of North University of China to study the effects of the quantity and blockage ratio of the circle ring obstacle on the flame propagation velocity in the inclosed tube.The research results show that the obstacle has obviously accelerating effect on the flame wave of gas explosion With the increase of quantity and blockage ratio of the obstacle,the flame accelerating effect becomes more obvious and the flame accelerating persistence is intenser,of which the effect of the quantity of the obstacle on the flame accelerating persistence is larger,but the effect of the blockage ratio of the obstacle on the flame accelerating persistenceis not obvious. 展开更多
关键词 flame propagation velocity quantity blockage ratio gas explosion
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Effects of potassium channel blockage on inverse stochastic resonance in Hodgkin-Huxley neural systems
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作者 Xueqing WANG Dong YU +3 位作者 Yong WU Qianming DING Tianyu LI Ya JIA 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2023年第8期735-748,共14页
Inverse stochastic resonance(ISR)is a phenomenon in which the firing activity of a neuron is inhibited at a certain noise level.In this paper,the effects of potassium channel blockage on ISR in single Hodgkin-Huxley n... Inverse stochastic resonance(ISR)is a phenomenon in which the firing activity of a neuron is inhibited at a certain noise level.In this paper,the effects of potassium channel blockage on ISR in single Hodgkin-Huxley neurons and in small-world networks were investigated.For the single neuron,the ion channel noise-induced ISR phenomenon can occur only in a certain small range of potassium channel blockage ratio.Bifurcation analysis showed that this small range is the bistable region regulated by the external bias current.For small-world networks,the effect of non-homogeneous network blockage on ISR was investigated.The network blockage ratio was used to represent the proportion of potassium-channel-blocked neurons to total network neurons.It is found that an increase in network blockage ratio at small coupling strengths results in shorter ISR duration.When the coupling strength is increased,the ISR is more significant in the case of a large network blockage ratio.The ISR phenomenon is determined by the network blockage ratio,the coupling strength,and the ion channel noise.Our results will provide new perspectives on the observation of ISR in neuroscience experiments. 展开更多
关键词 Inverse stochastic resonance(ISR) Small-world neuronal network Potassium channel blockage Network blockage ratio
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Comparative analysis between single-train passing and double-train intersection in a tunnel
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作者 Jianming DU Qian FANG +1 位作者 Xuan ZHANG Hualao WANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2024年第5期429-442,共14页
Aerodynamic pressure significantly impacts the scientific evaluation of tunnel service performance.The aerodynamic pressure of two trains running in a double-track tunnel is considerably more complicated than that of ... Aerodynamic pressure significantly impacts the scientific evaluation of tunnel service performance.The aerodynamic pressure of two trains running in a double-track tunnel is considerably more complicated than that of a single train.We used the numerical method to investigate the difference in aerodynamic pressure between a single train and two trains running in a double-track tunnel.First,the numerical method was verified by comparing the results of numerical simulation and on-site monitoring.Then,the characteristics of aerodynamic pressure were studied.Finally,the influence of various train-tunnel factors on the characteristics of aerodynamic pressure was investigated.The results show that the aerodynamic pressure variation can be divided into stage I:irregular pressure fluctuations before the train tail leaves the tunnel exit,and stage II:periodic pressure declines after the train tail leaves the tunnel exit.In addition,the aerodynamic pressure simultaneously jumps positively or drops negatively for a single train or two trains running in double-track tunnel scenarios.The pressure amplitude in the two-train case is higher than that for a single train.The maximum positive peak pressure difference(P_(STP))and maximum negative peak pressure difference(P_(STN))increase as train speed rises to the power from 2.256 to 2.930 in stage I.The P_(STP) and P_(STN) first increase and then decrease with the increase of tunnel length in stage I.The P_(STP) and P_(STN) increase as the blockage ratio rises to the power from 2.032 to 2.798 in stages I and II. 展开更多
关键词 Railway tunnel Aerodynamic effect Pressure characteristic Train speed Tunnel length blockage ratio
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An Aerothermal Study of Influence of Blockage Ratio on a Supersonic Tube Train System 被引量:5
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作者 SUI Yang NIU Jiqiang +4 位作者 YUAN Yanping YU Qiujun CAO Xiaoling WU Dan YANG Xiaofeng 《Journal of Thermal Science》 SCIE EI CAS CSCD 2022年第2期529-540,共12页
Evacuated tube transportation is an important development direction for the high-speed transportation technology of the future.However,a train running at supersonic speed in a closed tube can create an unstable aeroth... Evacuated tube transportation is an important development direction for the high-speed transportation technology of the future.However,a train running at supersonic speed in a closed tube can create an unstable aerothermal phenomenon,causing the temperature to rise sharply inside the tube and endangering the safe operation of trains and equipment.The blockage ratio is one of the key factors affecting the aerodynamic characteristics in the tube.In this paper,a 2 D axisymmetric model and Delayed Detached Eddy Simulation(DDES)based on the Shear Stress Transport(SST)k-ωturbulence model are used to study the aerothermal environment in the tube.The calculation method used in this paper was verified by a wind tunnel experiment.The aerothermal phenomenon and distribution of the flow field in the tube with different blockage ratios were compared and analysed.The results show that the aerothermal environment is significantly affected by the blockage ratio.A choking limit formed in the flow field will aggravate the aerodynamic phenomenon as the blockage ratio increases,which further deteriorates the aerothermal environment of the tube.Moreover,the existence of the choking limit,shock wave,and Mach disk make the flow field in the tube more complicated. 展开更多
关键词 tube train aerothermal environment blockage ratio choking limit numerical simulation
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Effect of Blockage Ratio on Heat Transfer and Pressure Drop in Rotating Ribbed Channels at High Rotation Numbers
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作者 DENG Hongwu LI Hua +2 位作者 TAO Zhi QIU Lu ZHU Jianqin 《Journal of Thermal Science》 SCIE EI CAS CSCD 2021年第3期902-913,共12页
At high rotation numbers,the rotational effects on heat transfer and flow could be diverse among the channels with different blockage ratios.However,most studies are conducted under low rotation number(less than 0.25)... At high rotation numbers,the rotational effects on heat transfer and flow could be diverse among the channels with different blockage ratios.However,most studies are conducted under low rotation number(less than 0.25)and selected blockage ratio.This paper experimentally investigates the effect of rib blockage ratio(ranges from 0 to 0.3)on pressure loss and heat transfer in a rotating square channel under high rotation number(up to 0.81).The ribs staggered on leading and trailing walls were oriented 90°to the mainstream flow.The Reynolds number and the wall-to-fluid temperature ratio varied from 20000 to 40000 and 0.08 to 0.2,respectively.The results showed that a larger blockage ratio resulted in a better heat transfer but a higher pressure drop.The optimum blockage ratio was 0.1 for the best thermal performance.The rotational effects were weakened in the passage with a higher blockage ratio,where the critical rotation number could not be observed.Moreover,the heat transfer enhancement induced by rotation was more significant when the temperature ratio increased.Finally,the correlations were developed for the pressure drop and the convective heat transfer on the leading and trailing edges. 展开更多
关键词 thermal performance rib blockage ratio high rotation number
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Study on the critical diameter of the subway tunnel based on the pressure variation 被引量:4
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作者 SUN ZhenXu YANG GuoWei ZHU Lan 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第10期2037-2043,共7页
When the subway train operates at a speed higher than 100 km/h,the corresponding aerodynamic issue becomes severe.To meet the future requirement for the speedup of subway trains,a research on the critical diameters of... When the subway train operates at a speed higher than 100 km/h,the corresponding aerodynamic issue becomes severe.To meet the future requirement for the speedup of subway trains,a research on the critical diameters of the subway tunnel for trains operating at 120 and 140 km/h has been performed based on passengers’aural discomfort caused by rail tunnel pressure variation.A three-dimensional computational fluid dynamic approach has been adopted for analysis.Meanwhile,trains with different airtight indices are considered and the pressure variations inside and outside the trains are both under investigation.Based on the corresponding criteria for different airtight indices,critical tunnel diameters for trains running at different speeds have been determined.This study would aid in the tunnel section design for future high-speed subway trains. 展开更多
关键词 tunnel pressure waves airtight index aural discomfort blockage ratio
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On minimum cavitation number of the ventilated supercavity in water tunnel 被引量:3
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作者 ZOU Wang YU KaiPing +1 位作者 ARNDTREA KAWAKAMIE 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第10期1945-1951,共7页
A numerical method consisted of the cavitation number correction and the model coefficient correction algorithms is presented to simulate the supercavity in water tunnel considering blockage and gravity effects based ... A numerical method consisted of the cavitation number correction and the model coefficient correction algorithms is presented to simulate the supercavity in water tunnel considering blockage and gravity effects based on the Logvinovich model.A model of the minimum cavitation number is also proposed based on the dimensional analysis theory,and the minimum cavitation number is formulated based on the model and numerical results using the nonlinear least square method(NLLS).The formula is verified by experiment to some extent. 展开更多
关键词 supercavity minimum cavitation number Froude number blockage ratio NLLS
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WALL EFFECTS ON FLOWS PAST TWO TANDEM CYLINDERS OF DIFFERENT DIAMETERS 被引量:2
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作者 JIANG Ren-jie LIN Jian-zhong 《Journal of Hydrodynamics》 SCIE EI CSCD 2012年第1期1-10,共10页
Flows past two tandem cylinders of different diameters placed centrally in a channel with fixed centre-to-centre spacing 6D and diameter ratio are simulated based on the Lattice Boltzmann Method(LBM).In all the simu... Flows past two tandem cylinders of different diameters placed centrally in a channel with fixed centre-to-centre spacing 6D and diameter ratio are simulated based on the Lattice Boltzmann Method(LBM).In all the simulations,the diameter of the smaller cylinder is chosen as the characteristic length.The Reynolds number based on the average inflow velocity is 20-120 and studies are over the range of blockage ratio 2-8.In both Small-Big Arrangement(SBA)and Big-Small Arrangement(BSA),the effects of the channel width and Reynolds number on the flow structures and force coefficients are studied.Results show that the flows in BSA are more regular than those in SBA for the same flow fields.In BSA with and,the force coefficients all fluctuate with constant amplitudes and a coupled frequency,the coupled frequency becomes small as the blockage ratio decreases and by an exact test we give out the relation of the blockage ratio and Strouhal number.As the blockage ratio decreases to 2,there exist pitchfork bifurcations in both SBA and BSA,and results show that the critical Reynolds numbers of pitchfork bifurcations for SBA and BSA are both between 60 and 80.In SBA with,the flow structure has a static asymmetric mode.It is found that the channel width has also an effect on the critical spacing where the flow changes from single body mode into co-shedding mode.By an accurate survey on flows past two cylinders with equal diameters placed inside a channel with the width,the relation between channel width and the critical spacing is given and results show that the critical spacing increases as the channel width increases. 展开更多
关键词 two tandem cylinders different diameters blockage ratio critical spacing Lattice Boltzmann Method(LBM)
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Flow past a bluff body subjected to lower subcritical Reynolds number 被引量:1
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作者 Pankaj Kumar Santosh Kumar Singh 《Journal of Ocean Engineering and Science》 SCIE 2020年第2期173-179,共7页
The paper aimed to study the flow structure at the wake of the bluff body with altered blockage ratio(BR)keeping the fixed aspect ratio(AR).The study was conducted by a finite volume technique using commercial softwar... The paper aimed to study the flow structure at the wake of the bluff body with altered blockage ratio(BR)keeping the fixed aspect ratio(AR).The study was conducted by a finite volume technique using commercial software Ansys-Fluent.The CFD analysis of the bluff body is mainly subjected to the lower subcritical Reynolds number range(5000 to 15,000)along with blockage ratio as an important factor.The flow parameters such as drag coefficient,pressure,and kinetic energy variations are analyzed here for the Reynolds number(Re)and BR.It was observed that at fixed Re,t he drag coefficient(C_(D))increases with an increase in the BR while decrease with increasing Re for a fixed value of BR. 展开更多
关键词 blockage ratio Bluff body Drag coefficient Reynolds number
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Investigation on low total temperature combustion characteristics of kerosene-fueled supersonic combustor
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作者 Jianping LI Kai WANG +2 位作者 Guiqian JIAO Zilong LIAO Jindong LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第7期192-208,共17页
In this paper,the combustion characteristics of kerosene-fueled supersonic combustor under the conditions of Mach number 2.0,the total temperature at 700 K and the total pressure at 520 k Pa(simulated flight Mach numb... In this paper,the combustion characteristics of kerosene-fueled supersonic combustor under the conditions of Mach number 2.0,the total temperature at 700 K and the total pressure at 520 k Pa(simulated flight Mach number at 3.5)were studied by using the flame stabilizing method of cavity and strut from three aspects such as blockage ratios,kerosene equivalence ratios,location and quantity of injection holes.The results showed that:(A)The combustor with the strut realized the independent and stable combustion of kerosene.The combustion-induced back pressure in the block test with blockage ratio of 20%and 10%destroyed the inlet flow conditions;while the blockage ratio was 7.3%and 5%,the incoming flow conditions when kerosene was burned stably were not destroyed.(B)The kerosene Equivalence Ratio(ER)was more likely to be disturbed upstream than the induced back pressure when it rose,and an excessively high-ER would reduce the combustion efficiency;when the equivalence ratio was constant,the combustion efficiency of the blockage ratio of 7.3%was higher than the blockage ratio of 5%.The combustion efficiencies were 0.86(ER=0.13)and 0.78(ER=0.19)when the blockage ratio was 5%,respectively;the combustion efficiencies were 0.89(ER=0.16)and 0.82(ER=0.19)when the blockage ratio was 7.3%,respectively;the combustion efficiencies were 0.51(ER=0.25),0.81(ER=0.3),0.65(ER=0.34)and0.62(ER=0.42)when the blockage ratio was 20%,respectively.(C)The porous injection provided behind the strut was beneficial to the atomization of kerosene and improved the combustion efficiency of kerosene;the second injection after the cavity would reduce the combustion efficiency due to insufficient oxygen and combustion space.This study expanded the working range of ramjet and provided a reference fuel injection scheme for Turbine-Based Combined Cycle(TBCC)engine. 展开更多
关键词 blockage ratio Combustion characteristics Combustion efficiency Kerosene equivalence ratio Low temperature
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