微燃烧室内截面突变对氢氧预混燃烧的影响  

Effects of sudden expansion on H_2/O_2 premixed combustion characteristics in micro-combustor

作　　者：潘剑锋[1] 陈琳琳[1] 卢青波[1] 刘启胜[1] 查正乾 PAN Jianfeng CHEN Linlin LU Qingbo LIU Qisheng ZHA Zhengqian(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2017年第2期150-154,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51376082;51206066);江苏省自然科学基金资助项目(BK20131253)

摘　　要：针对微燃烧室内部氢氧预混燃烧过程,建立耦合氢氧气相反应动力学机理的数值计算模型,利用CFD计算软件,在试验验证的基础上得到了带截面突变微燃烧室内的燃烧特性,并分析了截面突变尺寸和入口流速对于燃烧过程的影响.结果表明:采用截面突变的结构使得氢气和氧气混合更充分,燃烧更完全,并能提高微燃烧室内的流体温度;增加截面突变的尺寸,可以增加混合气在微燃烧室内的驻留时间,即使在较低入口流速下也能获得较高的燃烧室内部温度;在较低流速下,增加截面突变的尺寸,微燃烧室内的高温区域更宽;入口流速的增加导致氢气转化率降低,燃烧室内截面突变有利于缓解入口流速增加引起的氢气转化率下降的趋势.To investigate the hydrogen / oxygen premixed combustion process in micro-combustor,the numerical mechanism model of the coupled gas-phase reaction kinetic was established,and the numerical simulation was performed by CFD software. The combustion characteristics of micro-combustor with sudden expansion were obtained on the basis of experimental verification. The effects of sudden expansion size and inlet velocity on the combustion process were investigated. The results show that the sudden expansion can improve the mixing effect of hydrogen and oxygen and can make the combustion more complete to increase the fluid temperature in micro-combustor. The residual time of gas mixture in microcombustor is increased by the increasing of sudden expansion size to obtain high inside temperature even at low inlet flow rate. The conversion rate is decreased with the increasing of inlet flow rate. Microcombustor with sudden expansion can alleviate the decreasing of hydrogen conversion rate caused by the increasing of inlet velocity.

关 键 词：微燃烧室 气相反应 截面突变 燃烧特性 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]