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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Numerical study of the effects of exhaust gas recirculation stratification on reducing the rate of pressure rise in dimethyl ether homogeneous charge compression ignition combustion
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Numerical study of the effects of exhaust gas recirculation stratification on reducing the rate of pressure rise in dimethyl ether homogeneous charge compression ignition combustion

机译：排气再循环分层对降低二甲醚均相充量压缩点火燃烧中压力上升速率影响的数值研究

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摘要

This work investigates the potential of in-cylinder exhaust gas recirculation stratification for reducing the rate of pressure rise in dimethyl ether homogeneous charge compression ignition engines and its coupling with both thermal stratification and fuel stratification. Numerical analyses were performed using a five-zone version of the CHEMKIN-II kinetics rate code and the kinetic mechanics of dimethyl ether. The effects of inert components were used to represent the presence of exhaust gas recirculation in calculations. Three cases of exhaust gas recirculation stratification were tested in terms of both thermal stratification and fuel stratification at a fixed initial temperature, fixed initial pressure and fixed fuelling rate at bottom dead centre. In order to explore the appropriate stratification of exhaust gas recirculation, the exhaust gas recirculation width (defined as the difference between the exhaust gas recirculation ratios in zone I and zone 5 in the five-zone model) which we employed was from 0% to 30%. The case of exhaust gas recirculation homogeneity (called case I), in which the exhaust gas recirculation width is 0%, was examined. In case 2, exhaust gas recirculation is located densely in a hot zone for combination with thermal stratification or in a fuel-rich zone for combination with fuel stratification. The last case (case 3) was the inverse of case 2. Ringing was reduced to an acceptable level in the case of fuel stratification with an appropriate exhaust gas recirculation distribution, which slowed the rapid burning during the compression stroke.
机译：这项工作研究了缸内废气再循环分层对于降低二甲醚均质充量压燃式发动机的压力上升率及其与热分层和燃料分层的耦合的潜力。使用CHEMKIN-II动力学速率代码的五区版本和二甲醚的动力学力学进行了数值分析。惰性成分的作用用来表示计算中存在废气再循环。在固定初始温度，固定初始压力和固定死点下的固定加油率下，对热分层和燃料分层进行了测试，分别测试了三种废气再循环分层情况。为了探究排气再循环的适当分层，我们采用的排气再循环宽度（定义为五区模型中I区和5区的排气再循环率之差）为0％至30 ％。研究了排气再循环宽度为0％的排气再循环均匀性的情况（称为情况I）。在情况2中，废气再循环密集地位于热区中以与热分层相结合，或者位于富燃料区中以与燃料分层相结合。最后一种情况（情况3）与情况2相反。在燃料分层的情况下，通过适当的废气再循环分布，振铃降低到可接受的水平，这减慢了压缩冲程期间的快速燃烧。

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