End-gas autoignition and detonation development in a closed chamber
End-gas autoignition and detonation development in a closed chamber
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封闭室内的尾气自燃和爆炸发展
DOI：
10.1016/j.combustflame.2015.08.018
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发表时间：
2015-11
影响因子：
4.4
通讯作者：
Chen, Zheng
中科院分区：
文献类型：
--
作者：
Yu, Hao;Chen, Zheng
人们普遍认为火花点火发动机的爆震可能是由末端气体自燃引起的。然而，自燃引起的压力振荡和爆轰发展的详细机制仍不清楚。本文采用一维模拟方法研究了封闭腔室中末端气体自燃和爆轰发展。考虑了不同初始温度和压力下的氢/空气混合化学计量，并在模拟中包含了详细的化学反应。目的是确定可能的末端气体燃烧模式，并了解自燃诱导压力波和爆轰发展的机制。根据燃烧室长度以及初始温度和压力的不同，末端气体燃烧有三种模式：正常火焰传播无自燃、自燃无爆轰发展和爆轰发展。气体自燃方式决定了压力振荡的幅值：自燃可引起类似于传统爆震的高幅值压力振荡；爆轰发展可以引起类似于超爆震的极高振幅的压力振荡。结果表明，增加初始温度、初始压力或燃烧室长度都可以诱导自燃和爆轰发展。跟踪了不同流动颗粒的状态演变，发现自燃发生时燃烧模式由恒压向恒容转换。分析了压力波与化学反应的耦合关系，探讨了自燃前加速与爆轰发展的机理。此外，还对不同点火进度值的末气自燃进行了模拟。结果表明，高反应性的终气有利于自燃和爆轰的发展。
It is generally accepted that knock in spark ignition engines might be caused by end-gas autoignition. However, the detailed mechanism for autoignition-induced pressure oscillation and detonation development is still not well understood. This work studied end-gas autoignition and detonation development in a closed chamber using 1D simulation. Stoichiometric hydrogen/air mixture at different initial temperatures and pressures was considered and detailed chemistry was included in simulation. The objectives were to identify possible modes of end-gas combustion and to understand the mechanism of autoignition-induced pressure wave and detonation development. Depending on the chamber length as well as the initial temperature and pressure, there are three modes of end-gas combustion: normal flame propagation without autoignition, autoignition without detonation development, and detonation development. The amplitude of pressure oscillation was found to be determined by the mode of end-gas autoignition: autoignition can induce high amplitude of pressure oscillation similar to conventional knock; and detonation development can cause extremely high amplitude of pressure oscillation similar to super-knock. It was shown that autoignition and detonation development can be induced by increasing the initial temperature, initial pressure, or chamber length. The evolution of states of different flow particles was tracked and the combustion mode was found to switch from constant-pressure to constant-volume when autoignition occurs. The coupling between pressure wave and chemical reaction was analyzed and the mechanism for autoignition front acceleration and detonation development was investigated. Moreover, autoignition in end-gas with different values of ignition progress was simulated. It was demonstrated that high reactivity of end-gas promotes autoignition and detonation development.
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影响因子：
10.4
作者：
Zhi Wang;Xu He;Jian-xin Wang;S. Shuai;Fan Xu;Dongbo Yang
通讯作者：
Zhi Wang;Xu He;Jian-xin Wang;S. Shuai;Fan Xu;Dongbo Yang
一维定容弹超爆震燃烧模式的实验研究
影响因子：
7.2
作者：
Yuliang Qi;Xin He;Zhi Wang;Jianxin Wang;Huiqiang Zhang;Yizhou Jiang
通讯作者：
Yizhou Jiang
影响因子：
4.4
作者：
H. Terashima;M. Koshi
通讯作者：
H. Terashima;M. Koshi
影响因子：
4.4
作者：
C. Yoo;T. Lu;Jacqueline H. Chen;C. Law
通讯作者：
C. Yoo;T. Lu;Jacqueline H. Chen;C. Law
影响因子：
4.4
作者：
R. Zhou;Jian-ping Wang
通讯作者：
R. Zhou;Jian-ping Wang