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Sensitivity and effect of key operational parameters on performance of a dual-cylinder free-piston engine generator

Journal of Central South University 2022年第7期29卷 2101-2111页

作者： ZHANG Zhi-yuan FENG Hui-hua JIA Bo-ru ZUO Zheng-xing School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

The free-piston engine generator(FPEG)is regarded as the next generation of energy conversion system which may replace traditional engines in the *** effect of key operational parameters like excess air ratio of input mixture and ignition position on the engine performance of a dual-cylinder FPEG was investigated,and their sensitivity was analyzed in this *** operating compression ratio of the system is susceptible to changes in excess air ratio and ignition *** the same time,it decreases from 15.8 to 6.6 when excess air ratio increases from 0.85 to 1.15,but it increases from 6.1 to 13.3 as ignition position increases from 15 mm to 20 *** operating frequency and indicated power are more sensitive to changes in excess air ratio than ignition *** it is the opposite for the indicated thermal efficiency and friction *** air ratio and ignition position have a quite similar influence on heat ***,from the perspective of system operation and performance,it is preferable to keep excess air coefficient slightly below *** contrast,when selecting ignition position,it is of great importance to comprehensively consider the risk of structural damage caused by the increase in the compression ratio and in-cylinder gas pressure.

关键词： free piston engine generator excess air ratio ignition position operation characteristics sensitivity analysis thermal efficiency

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Experimental and numerical evaluations on characteristics of vented methane explosion

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Journal of Central South University 2020年第8期27卷 2382-2393页

作者： SU Bin LUO Zhen-min WANG Tao LIU Lang School of Safety Science&Engineering Xi’an University of Science and TechnologyXi’an 710054China School of Energy Xi’an University of Science and TechnologyXi’an 710054China

To research the characteristics of vented explosion of methane-air mixture in the pipeline,coal mine tunnel or other closed space,the experiments and numerical simulations were carried *** this work,explosion characteristics and flame propagation characteristics of methane in pipeline and coal mine tunnel are studied by using an explosion test system,combined with FLACS software,under different vented *** numerical simulation results of methane explosion are basically consistent with the physical experiment results,which indicates that the numerical simulation for methane explosion is reliable to be applied to the *** results show that explosion parameters(pressure,temperature and product concentration)of methane at five volume fractions have the same change ***,the explosion intension of 10.0%methane is the largest and that of 9.5%methane is relatively weak,followed by 11.0%methane,8.0%methane and 7.0%methane *** different vented conditions,the pressure and temperature of methane explosion are the highest in the pipeline without a vent,followed by the pipeline where ignition or vent position is in each end,and those are the lowest in the pipeline with ignition and vent at the same *** is no significant effect on final product concentration of methane explosion under three vented *** coal mine tunnel,it is indicated that the maximum explosion pressure at the airproof wall in return airway with the branch roadway at 50 m from goaf is significantly decreased while that in intake airway does not change *** addition,when the branch roadway is longer or its section is larger,the peak pressure of airproof wall reduces slightly.

关键词： methane-air flame propagation CFD simulation vented explosion ignition position peak pressure

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Numerical Investigations on the Impact of Turbulent Prandtl Number and Schmidt Number on Supersonic Combustion

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Fluid Dynamics & Materials Processing 2020年第3期16卷 637-650页

作者： Yongkang Zheng Chao Yan National Key Laboratory of Computational Fluid Dynamics Beihang UniversityBeijing100191China State Key Laboratory of Aerodynamics Mianyang621000China

The flow field inside the combustor of a scramjet is highly complicated and the related turbulent Prandtl and Schmidt numbers have a significant impact on the effective numerical prediction of such *** in many cases researchers set these parameters on the basis of purely empirical laws,assessing their impact(via parametric numerical simulations)is a subject of great *** the present work,in particular,two test cases with different characteristics are selected for further evaluation of the role played by these non-dimensional numbers:Burrows-Kurkov case and DLR *** numerical results indicate that these parameters influence ignition ***,the temperature distribution is more sensitive to them than to H2O mass fraction and velocity distributions.

关键词： Turbulent Prandtl number turbulent Schmidt number ignition position supersonic combustion

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