Influence of Injection and Flame Propagation on Combustion in Motorcycle Engine - Investigation by Visualization Technique
Influence of Injection and Flame Propagation on Combustion in Motorcycle Engine - Investigation by Visualization Technique
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喷射和火焰传播对摩托车发动机燃烧的影响——可视化技术研究
DOI：
10.4271/2011-32-0566
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Iida
中科院分区：
文献类型：
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作者：
M. Yumoto;K. Goto;Shouichi Kato;M. Iida
为了直接研究喷油对燃烧的影响以及它们之间的关系，本文对摩托车喷油发动机的喷油、壁膜和初始火焰传播行为进行了可视化研究。用内窥镜观察火焰在燃烧室和进气道壁膜中的传播情况。测试了不同的喷射系统和喷射参数：喷射方向、定时和液滴大小，以研究混合物形成的影响。结果表明，低负荷条件下，燃烧室内混合气的不均匀性对燃烧稳定性有很大影响，其证据就是发光。它是由于大量液滴较大的液体燃料直接进入燃烧室或进气道内的混合气过于不均匀而引起的。在节气门大开的情况下，由于壁膜直接引入燃烧室，火焰中也有发光。最后，高雾化喷雾在保持低负荷条件下的燃烧稳定性和高负荷条件下的燃烧均匀性方面具有很大的潜力，并且没有因壁膜而导致的瞬态行为缺陷。
This paper reports visualization of behavior of spray, wall film, and initial flame propagation in an SI engine with port fuel injection system for motorcycle in order to directly investigate their influences on combustion and relations among them. Borescopes were used to visualize the flame propagation in the combustion chamber and wall film in the intake port. Various injection systems and injection parameters were tested: injection direction, timing, and size of droplets to investigate the effect of mixture formation. It is concluded that combustion stability under low load condition is greatly influenced by mixture inhomogeneity in the combustion chamber whose evidence is the luminous emission. It is caused by direct induction of considerable amount of liquid fuel with large size of droplets into combustion chamber or too inhomogeneous mixture in the intake port. Luminous emission in the flame was also seen under wide open throttle condition due to direct introduction of wall film into combustion chamber. Finally, great potential of highly atomized spray to keep combustion stability under low load condition and homogeneity under high load condition without defect of transient behavior due to wall film has been shown with injection timing of IVO.