【作者】 罗徐霖； 李岩松； 崔明利； 孔令逊； 李雪松； 许敏；

【Author】 Luo Xulin;Li Yansong;Cui Mingli;David L.S.Hung;Li Xuesong;Xu Min;School of Mechanical Engineering,Shanghai Jiao Tong University;University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University;

【机构】 上海交通大学机械与动力工程学院； 上海交通大学密西根学院；

【摘要】 闪沸喷雾作为一种相变喷雾形式,在替代燃料和零碳燃料的燃烧方面具有重要意义。然而当前的研究大部分集中在喷雾形态研究上,对燃烧机理的研究较少。故本文使用定容燃烧弹对稀薄工况下的闪沸喷雾雾化和燃烧过程进行分析,重点研究闪沸喷雾特性、混合气着火特性、火焰传播特性和燃烧放热特性。结果表明,闪沸喷雾能有效降低着火延迟,提升火焰速度,从而有利于能量转换,实现更快的放热率和更高的放热量。并且闪沸喷雾火焰前端形状更加规则,表明更加稳定的火焰传播,有助于提升发动机的热效率和稀燃条件下的燃烧稳定性。更多还原

【Abstract】 Flash boiling atomization,as a form of phase-changing spray,plays an important role in the combustion of alternative fuels and zero-carbon fuels.However,most of the current researches focus on the spray morphologies,and there are few studies on the fundamental combustion mechanism.Therefore,this research uses constant volume combustion chamber(CVCC) to analyze flash boiling spray and combustion under lean conditions,focusing on the fuel atomization,mixture ignition and flame kernel development,flame propagation and heat release characteristics.The results show that flash boiling spray can effectively reduce ignition delay and increase flame propagation speed,which is beneficial to energy conversion thus achieving higher heat release rate and larger cumulative heat release.Moreover,the flame front shape of flash boiling combustion is more regular,which suggests flash boiling spray has good potential to improve engine thermal efficiency as well as combustion stability.更多还原