不同初始压力下氢气燃烧的胞状不稳定性及自加速性  

Cellular Instability and Self-Acceleration of Hydrogen Combustion at Various Initial Pressure

作　　者：暴秀超[1] 刘福水[2] 张正芳[1] 

机构地区：[1]西华大学交通与汽车工程学院,成都610039 [2]北京理工大学机械与车辆工程学院,北京100081

出　　处：《燃烧科学与技术》2014年第1期38-43,共6页Journal of Combustion Science and Technology

基　　金：四川省教育厅自然科学基金资助项目(11ZA283);"流体及动力机械"省部共建教育部重点实验室2011年学术成果培育基金资助项目(SBZDPY-11-20);西华大学重点基金资助项目(Z1120318)

摘　　要：采用高速纹影摄像系统和定容燃烧弹对不同初始压力下（0.1～0.5,MPa）氢气燃烧的不稳定性和自加速性进行了实验研究，分析了火焰胞状不稳定性的发展过程和变化规律，分别对比了火焰轮廓及火焰传播速度的自加速表现．研究结果表明，在火焰没有达到一开始就完全胞状化之前，随初始压力的增大，氢气燃烧的不稳定性增强；胞状不稳定的火焰会出现自加速，而稳定火焰不会出现自加速；火焰的加速特性在均布的胞状结构形成后便会出现，其始点与胞状不稳定的火焰临界半径一致，始点过后，火焰的传播速度（或燃烧速度）随着燃烧半径的增加（或燃烧时间的增加）而不断地自加速．An experimental study on the hydrogen combustion instability and self-acceleration was done at various initial pressure（0.1-0.5,MPa）by using constant volume combustion bomb and high speed schlieren system. The evo-lution and mechanism of hydrogen flame cellular instability were analyzed. The self-acceleration performance between flame profiles and flame propagation speeds was compared. The results showed：the hydrogen flame instability was enhanced with the increase of initial pressure,unless the flame was fully cellular at the beginning. Self-acceleration occurred to instable cellular flame but never to stable flame. The flame self-acceleration,whose starting time was the same as that of the critical radius of the flame,could be found after the uniformly distributed cellular took shape. The flame propagation speed（or burning velocity）accelerated with the increase of flame radius increasing（or burning time）after the initial phase.

关 键 词：氢气 定容燃烧弹 胞状不稳定性 自加速 

分 类 号：TK16[动力工程及工程热物理—热能工程]