| 液化石油气发动机燃油喷射过程的数值模拟及其试验研究 |
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| 引用本文： | 郑瑞,张煜盛,田威.液化石油气发动机燃油喷射过程的数值模拟及其试验研究[J].内燃机工程,2006,27(5):1-5. |
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| 作者姓名： | 郑瑞 张煜盛 田威 |
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| 作者单位： | 华中科技大学,能源与动力工程学院,武汉,430074 |
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| 基金项目： | 高等学校博士学科点专项科研项目;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 针对采用普通泵-管-嘴燃油系统的液化石油气(LPG)直喷式发动机,建立了考虑高压油泵柱塞偶件燃油泄漏量影响的燃油系统数学模型,并对燃油喷射过程进行了模拟计算及其计算结果的试验验证,揭示了LPG发动机燃油喷射过程的基本规律与工作特征。研究表明:由于LPG具有较高的饱和蒸汽压和可压缩性,致使其压力上升和下降都比较缓慢,供油持续期加长,油管内燃油残余压力较高,压力波动较大,容易发生二次喷射;通过增大出油阀卸载容积的办法,可以消除LPG的二次喷射等异常喷射现象。
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| 关 键 词： | 内燃机 柴油机 液化石油气 燃油喷射 数值模拟 |
| 文章编号： | 1000-0925（2006）05-001-05 |
| 收稿时间： | 09 1 2005 12:00AM |
| 修稿时间： | 2005年9月1日 |
Experimental and Numerical Study of LPG Fuel Injection Process in Direct Injection Diesel Engine |
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| ZHENG Rui,ZHANG Yu-sheng,TIAN Wei.Experimental and Numerical Study of LPG Fuel Injection Process in Direct Injection Diesel Engine[J].Chinese Internal Combustion Engine Engineering,2006,27(5):1-5. |
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| Authors: | ZHENG Rui ZHANG Yu-sheng TIAN Wei |
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| Affiliation: | College of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | This paper presented an experimental and computational study of the hydraulic phenomena and the dynamics of conventional pump-pipe-injector fuel supply system in a direct injection diesel engine operated with liquefied petroleum gas(LPG).The effect of the fuel leakage from the fuel pump and injector on the LPG supply process was taken into account.The simulation and experiment results show that in comparison with the conventional diesel fuel,retarded start of fuel injection,longer fuel injection duration,higher residual pressure and secondary injection phenomena for LPG are observed as a result of the higher compressibility and higher vapor pressure.The secondary injection phenomena are observed for LPG fuel injection and those can be controlled by increasing the relief volume of the delivery valve. |
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| Keywords: | IC engine diesel engine liquefied petroleum gas fuel injection numerical simulation |
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