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Experimental study on knock sources in spark ignition engine with exhaust gas recirculation

机译：废气再循环火花点火发动机爆震源的实验研究

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摘要

The presented study aims to experimentally investigate the sources of influence of exhaust gas recirculation on the tendency toward knock in the spark ignition engine. The three main sources of influence of exhaust gas recirculation on the engine tendency towards knock are known. The influence on flame propagation changes the profile of combustion and therefore the end-gas pressure and temperature profile. The thermal influence changes the thermal properties of the end-gas mixture and consequently its temperature profile, while the chemical influence changes the kinetic behaviour of the end-gas mixture. The study is based on the results from experimental setup with spark ignition engine that uses cooled exhaust gas recirculation system and air heater installed into the intake manifold. Experimental tests that employ a new approach were performed, where intake temperature is varied by air heater when engine is operated with different levels of exhaust gas recirculation. In this way the end-gas temperature and exhaust gas recirculation percentage were varied while the influence on flame propagation was partially compensated by the change of spark timing. The obtained results show that there is no clear chemical influence of the exhaust gases on the tendency towards knock as the cases with low and high levels of exhaust gas recirculation are all mixed when the temperature of the end-gas is set to the same values. This leads to the overall conclusion that the predominant factor in a tendency towards knock is the end-gas temperature profile.
机译：本研究旨在通过实验研究废气再循环对火花点火发动机爆震趋势的影响。已知废气再循环对发动机爆震趋势的三个主要影响源。对火焰传播的影响会改变燃烧曲线，从而改变最终气体的压力和温度曲线。热影响改变了最终气体混合物的热性能，并因此改变了其温度曲线，而化学影响改变了最终气体混合物的动力学性能。该研究基于火花点火发动机的实验装置的结果，该装置使用冷却的废气再循环系统和安装在进气歧管中的空气加热器。进行了采用新方法的实验测试，当发动机以不同水平的废气再循环运行时，进气温度会通过空气加热器来改变。这样，改变了最终气体温度和废气再循环百分比，同时通过火花正时的改变部分补偿了对火焰传播的影响。所获得的结果表明，当将尾气温度设定为相同值时，由于低和高水平的废气再循环情况都混合在一起，因此废气对爆震趋势没有明显的化学影响。由此得出总体结论，爆震趋势的主要因素是最终气体温度曲线。

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