高温下掺氢燃气层流燃烧速度和稳定性研究  

Laminar Combustion Speed and Stability of Hydrogen-Doped Gas at High Temperature

作　　者：朱源 姜根柱[1] 王筱蓉[1] 苏傲成 ZHU Yuan;JIANG Genzhu;WANG Xiaorong;SU Aocheng(School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学机械工程学院,江苏镇江212003

出　　处：《车用发动机》2023年第6期26-32,共7页Vehicle Engine

基　　金：江苏省研究生创新基金项目(No.SJCX22_1930)。

摘　　要：基于定容燃烧弹系统结合高速纹影技术,研究了初始温度为450 K,初始压力为0.2 MPa,氢气含量为50%,70%和80%,当量比为0.7~1.4时的氢气-乙醇-空气混合燃气的层流火焰燃烧特性。对掺氢燃气的层流燃烧速度(LBV)以及火焰不稳定性进行研究。结果表明:扩大燃料中氢气的占比能提高混合燃气的LBV;氢气掺混含量为50%,70%和80%预混燃气的层流燃烧速度均在当量比为1.3下达到峰值,随后呈下降趋势。当氢气掺混含量为50%,70%和80%时,随着当量比的上升,L b逐渐减小,在当量比为1.4左右变成负值,火焰表面出现裂纹并发展出细胞结构,火焰呈现不稳定状态。Based on the constant volume combustion bomb system and high-speed schlieren technology,the laminar flame combustion characteristics of hydrogen-ethanol-air mixed gas were studied with initial temperature of 450 K,initial pressure of 0.2 MPa,hydrogen content of 50%,70%and 80%and equivalent ratio of 0.7-1.4.The laminar combustion velocity(LBV)and flame instability of hydrogen-doped gas were studied.The results show that increasing the proportion of hydrogen in fuel can increase the LBV of mixed gas.The LBV of premixed gas with three hydrogen contents all reach the peak at the equivalent ratio of 1.3 and then show a downward trend.With the increase of equivalence ratio,L b gradually decreases and becomes negative when the equivalence ratio is about 1.4.Cracks appear and develop to cell structure on the flame surface,and the flame is unstable.

关 键 词：混合气 层流燃烧速度 掺氢比 燃烧稳定性 

分 类 号：TK407.9[动力工程及工程热物理—动力机械及工程]