一种车用燃油加热器燃烧器的流场数值分析  

Numerical simulation of the flow in a fuel burned vehicle heater

作　　者：王伟[1] 毛华永[2] 李国祥[2] 潘世艳[2] 巩厅房[2] 晋世强 郝胜兵 

机构地区：[1]河南机电高等专科学校,河南新乡453002 [2]山东大学能源与动力工程学院,山东济南250061 [3]河北宏业机械股份有限公司,河北泊头062150

出　　处：《山东大学学报（工学版）》2008年第3期64-68,共5页Journal of Shandong University（Engineering Science）

基　　金：山东省自然科学基金资助项目(Y2007F26)

摘　　要：由数值计算分析知:切向进气孔所产生的旋流对锥盖内表面形成冲刷,并影响一级燃烧室内部三层进气孔的进气,其旋流影响贯穿整个燃烧室.一级燃烧室的第一层进气孔所进气流在其燃烧室轴心碰撞翻转,形成锥盖内腔绕轴线分布的轴向涡流,从而加强了锥盖内表面的冲刷卷吸流动.而在一级燃烧室锥形缩口处,因进气分流孔的分流作用,使二级燃烧室的前端形成若干小旋涡,这些小旋涡与锥形缩口处的大旋涡并存,使燃烧室边缘区域的混合得到了强化.锥盖形燃烧器能减少流动死区,有利于油气的充分混合燃烧,从而减少积炭的生成.计算结果与样机试验数据基本吻合.The simulation results show that the swirl of intake air generated by tangent inlet holes washes the inner face of the cone-cover, which can influence the air intake of the three-layer inlet holes in the first combustor through the whole combustor. The air intake through the first-layer inlet holes of the first combustor crashes and turns at the center of the combustor, which forms axial swirls around the axis of the cone-cover cavity, so as to strengthen the wash and engulfment at the inner face of the cone-cover. At the cone shrinking part of the first combustor, many small swirls were produced at the forepart of the second combustor for the diffluence effect of the intake diftluent holes; which coexist with the large swirls at the cone shrinking part and intensify the mixture at the fringe area of the combustor. The cone-cover combustor can reduce flow stagnation and make full use of the full mixture and combustion of fuel and air, which will decrease soot formation. Simulation results basically agreed with the sample engine test data.

关 键 词：燃油加热器 燃烧器 气体流动 数值模拟 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]