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Solution of idle LBO problem for high FAR aero combustor
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作者 CHIN Jushan ZENG Qinghua 《推进技术》 EI CAS CSCD 北大核心 2024年第10期96-104,共9页
The paper sheds light on the idle lean blow off(LBO)problem for high fuel air ratio(FAR)com⁃bustor,which is impossible to be addressed with traditional aero combustor design.A significant improvement in aero combustor... The paper sheds light on the idle lean blow off(LBO)problem for high fuel air ratio(FAR)com⁃bustor,which is impossible to be addressed with traditional aero combustor design.A significant improvement in aero combustor design is required to resolve the idle LBO issue.The authors detailed a practical and efficient solu⁃tion,which not only solved the idle LBO issue but also defined the aero-thermal design for high-FAR combustor.The design will usher in a new era of aero combustor. 展开更多
关键词 Aero engine COMBUSTOR Idle lean blow off High fuel air ratio Concentric circle zoning combustion
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3D FEA simulation of 4A11 piston skirt isothermal forging process 被引量:2
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作者 董万鹏 陈军 《中国有色金属学会会刊:英文版》 EI CSCD 2008年第5期1196-1200,共5页
To eliminate the defects during piston skirt isothermal forming process,simulations under different process parameters such as the deformation temperature and friction factor were analyzed with the rigid-plastic FEA.D... To eliminate the defects during piston skirt isothermal forming process,simulations under different process parameters such as the deformation temperature and friction factor were analyzed with the rigid-plastic FEA.Deformation pattern,metal flow and influence of process parameters were concluded.The prediction load value with a relative error of 4.98% is more accurate to the testing one than that from the empirical formula whose relative error is up to 50.8%.Finally,based on the simulation results,an improved process at 300 ℃ and 0.005-0.05 s-1 was verified without any defects by the physical try-out. 展开更多
关键词 有限元分析 活塞裙 等温成型 燃烧机车
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Development of performance and combustion system of Atkinson cycle internal combustion engine 被引量:7
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作者 LIU FuShui SUN BaiGang +4 位作者 ZHU HuaRong HU TieGang DU Wei LI XiangRong ZHANG Zheng 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期471-479,共9页
The application of hybrid vehicle is a practical technical solution to the energy shortage and the environmental pollution.The internal combustion engine(ICE)plays a key role in the development of the hybrid vehicle.B... The application of hybrid vehicle is a practical technical solution to the energy shortage and the environmental pollution.The internal combustion engine(ICE)plays a key role in the development of the hybrid vehicle.Based on the requirements of the hybrid vehicle and the characteristic of Atkinson cycle,a set of designing methods for the Atkinson cycle gasoline engine is presented through the analysis of the optimized matching for the compression ratio,valve timing and the combustion chamber.The designing method has been verified by the bench test and the results show that the fuel consumption can be improved by12%–15%with the reduction of the low speed torque by 10%,and the low fuel consumption region in the fuel map extends significantly with the rated power almost keeping constant.It may be of great reference for the development of hybrid vehicle technology in China. 展开更多
关键词 hybrid vehicle Atkinson cycle compression ratio valve timing combustion chamber
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Investigation of the combustion deterioration of an automotive diesel engine under transient operation 被引量:9
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作者 ZHANG LongPing LIU ZhongChang +1 位作者 TIAN Jing SUN ShiJie 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期480-488,共9页
With increasingly stringent emission regulations and demand for fuel economy by the public,the combustion and emission problems of automotive diesel engines during transient operation have become vital and urgent issu... With increasingly stringent emission regulations and demand for fuel economy by the public,the combustion and emission problems of automotive diesel engines during transient operation have become vital and urgent issues.In this study,combustion deterioration has been experimentally analyzed using a heavy-duty turbocharged diesel engine running under transient conditions(constant speed and increasing torque).Optimization of the transient combustion process was performed by adjusting the fuel injection parameters.The results indicated that the notable combustion deterioration relative to steady state operation while transient was a function of the delay in the air-supply to the turbocharged engine,and took the form of combustion phasing delay,resulting in rapidly increasing smoke emission and fuel consumption.However,the delay in combustion phasing can be controlled by advancing the fuel injection timing,effectively increasing thermal efficiency.Unfortunately,smoke and NO x emissions increased at the same time.The deterioration in combustion phasing can also be improved by increasing injection pressure,resulting in decreased smoke emission while NO x emission increased.It is worth noting that the effective thermal efficiency first increased and then decreased as fuel injection pressure increased during transient operation. 展开更多
关键词 diesel engine transient operation combustion deterioration injection parameters combustion optimization
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