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On the hydrodynamics of hydraulic machinery and flow control 被引量:6
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作者 陈红勋 马峥 +6 位作者 张伟 朱兵 张睿 魏群 张正川 刘超 何建武 《Journal of Hydrodynamics》 SCIE EI CSCD 2017年第5期782-789,共8页
Hydraulic machinery mainly includes turbine and pump, which is closely related to national economy and people's livelihood involving aerospace industry, marine engineering, hydropower engineering, petroleum industry,... Hydraulic machinery mainly includes turbine and pump, which is closely related to national economy and people's livelihood involving aerospace industry, marine engineering, hydropower engineering, petroleum industry, chemical industry, mining industry, biomedical engineering, environmental engineering, agricultural water-soil engineering, etc.. The internal flow of hydraulic machinery is extremely complex, and its characteristics can be summarized as high Reynolds number, multi-scales, inhomogeneous and vortex-dominant unsteady turbulence which interact with the rotating dynamic boundary(rotor blade). Based on the analysis of the internal flow characteristics of hydraulic machinery, the author and his research team successively proposed a rotation correction model, a curvature corrected filter-based model, a scalable detached eddy simulation method, and a non-linear hybrid RANS/LES turbulence model to capture unsteady flow structures and then predict hydraulic performance and dynamic characteristics more accurately. According to the analysis on the internal flow, the corresponding flow control measures were put forward. It was verified by experiments that these methods could significantly improve the hydraulic performance, anti-cavitation performance and dynamic characteristics(pressure pulsation and vibration) of hydraulic machinery in a certain range of operating conditions. In addition, the mechanism how flow control measures influence internal flow was analyzed in depth, aiming at finding a feasible and effective way to improve hydraulic performance, anti-cavitation performance and dynamic characteristics of hydraulic machinery. 展开更多
关键词 hydraulic machinery unsteady flow turbulence model flow control method dynamic characteristic
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Computation method and control strategy of rotating separation flows in hydraulic machinery
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作者 Chao-yue Wang Fu-jun Wang +3 位作者 Hao Wang Hao-ru Zhao Zhi-feng Yao Ruo-fu Xiao 《Journal of Hydrodynamics》 SCIE EI CSCD 2022年第6期1006-1020,共15页
Rotating separation flow(RSF)in hydraulic machinery is characterized by the large flow separations and complex vortical structures induced by the effects of strong rotation,large curvature and multiple wall surfaces,a... Rotating separation flow(RSF)in hydraulic machinery is characterized by the large flow separations and complex vortical structures induced by the effects of strong rotation,large curvature and multiple wall surfaces,and conducting efficient engineering computation and putting forward effective control strategy for the RSF are important topics in the inner flow theory.To meet these engineering requirements,the studies on computational method and control strategy of the RSF are conducted in this paper.In terms of the computational method,the time-scale-driven(TSD)hybrid unsteady Reynolds-averaged Navier-Stokes/large eddy simulation(URANS/LES)modelling strategy is clarified,and an adaptive TSD hybrid model is established based on the RSF characteristics in hydraulic machinery,thereby avoiding the problem of non-monotonic grid convergence and improving the robustness.Besides,a novel vortex-feature-driven idea suitable for the RSF is further developed inspired by it.In terms of the control strategy,the secondary flow generation mechanism in a rotor domain is revealed,and the relationship between natural secondary flows and blade loading distributions is grasped.On the basis of it,an active control strategy with general significance is proposed,and a general alternate loading technique(GALT)is established.Both aspects can provide generalized paradigms with expandable potential,which are of benefit to the efficient computation and effective control of the RSF in hydraulic machinery. 展开更多
关键词 Rotating separation flow hydraulic machinery engineering computation turbulence model flow control blade loading
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Parallel Simulation of 3-D Turbulent Flow Through Hydraulic Machinery
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作者 徐宇 吴玉林 《Tsinghua Science and Technology》 SCIE EI CAS 2003年第6期697-701,707,共6页
Parallel calculational methods were used to analyze incompressible turbulent flow through hydraulic machinery. Two parallel methods were used to simulate the complex flow field. The space decomposition method divides... Parallel calculational methods were used to analyze incompressible turbulent flow through hydraulic machinery. Two parallel methods were used to simulate the complex flow field. The space decomposition method divides the computational domain into several sub-ranges. Parallel discrete event simulation divides the whole task into several parts according to their functions. The simulation results were compared with the serial simulation results and particle image velocimetry (PIV) experimental results. The results give the distribution and configuration of the complex vortices and illustrate the effectiveness of the parallel algorithms for numerical simulation of turbulent flows. 展开更多
关键词 parallel simulation hydraulic machinery particle image velocimetry (PIV) turbulent flow VORTICES
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Comparison of the Convergent and Divergent Runners for a Low Head Hydraulic Turbine
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作者 Zbigniew Krzemianowski Romuald Puzyrewski 《Journal of Energy and Power Engineering》 2015年第12期1037-1046,共10页
The paper presents a method of the runner blades design for simple case of hydraulic turbine. Two differently shaped channels of meridional cross section were examined. The quantitative evaluation was performed by mea... The paper presents a method of the runner blades design for simple case of hydraulic turbine. Two differently shaped channels of meridional cross section were examined. The quantitative evaluation was performed by means of 3D algorithm. It has been found that, divergent runner prevails convergent from dissipation point of view. Although, the influence of draft tube has not been analyzed, the presented method is important for the designers of low head hydraulic turbines which are not the matter of standardization due to variety of environmental conditions. 展开更多
关键词 hydraulic machinery design inverse problem 2D model
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Effects of rare-earth Y addition on microstructure and mechanical properties of lead-tin bronze
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作者 REN Xiao-yan REN Ji-ping +3 位作者 ZHANG Guo-wei XU Hong WEN Li-ming SUN Gang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2018年第1期84-87,共4页
Piston pump rotor is one of the indispensable parts of hydraulic machinery,whose performance and quality determine the drive efficiency and service life of the piston pump.This paper mainly studies the effect of rare-... Piston pump rotor is one of the indispensable parts of hydraulic machinery,whose performance and quality determine the drive efficiency and service life of the piston pump.This paper mainly studies the effect of rare-earth yttrium(Y)on the microstructure and properties of the wear layer in piston pump rotor.The material of the wear layer is composed of lead-tin bronze.By adding different contents of rare earth Y,observe the change of microstructure and properties of lead-tin bronze.Through comparison,the addition of rare-earth Y can improve the tensile strength and elongation of lead-tin bronze,and the organization of lead particle morphology has become much smaller and uniformer than that without rare-earth.However,if the amount of rare-earth is too high,the tensile strength and elongation decrease,and the lead particles in the organization also have the tendency to grow up.Finally,it is concluded that when the amount of rare earth is 0.04%,the comprehensive performance is the best. 展开更多
关键词 lead-tin bronze rare-earth yttrium(Y) piston pump rotor hydraulic machinery
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