蒸发混合式汽车燃油加热器燃烧室配风模拟计算及改进设计  

Numerical Simulation and Structure Improvement of Air Distribution System for Combustion Chamber of Vehicle-Used Vaporized/Mixed Fuel Heater

作　　者：王桂华[1] 靳忠伟[2] 李国祥[1] 毛华永[1] 王伟[1] 薛建波[1] 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]上海理工大学动力工程学院

出　　处：《内燃机工程》2006年第4期35-38,共4页Chinese Internal Combustion Engine Engineering

基　　金：山东省优秀中青年科学家奖励基金(2004BS05004);清华大学汽车安全与节能国家重点实验室开放基金(KF200606)

摘　　要：对蒸发混合式汽车燃油加热器燃烧室配风系统的结构进行了改进研究。采用k-ε双方程模型,利用FIRE软件,对一台5 kW加热器配风系统各层进气孔的直径、数量、位置、旋向等参数对燃烧室内部流场的影响进行了模拟计算和分析,结果发现：燃烧室内中心涡和周向涡并存,后者流速慢,是形成积碳的主要区域。提出了能够扩大中心涡、减小周向涡的改进方案,试验表明,改进方案较好地解决了原加热器一级燃烧室缩口及周壁局部积碳较多的问题。The research on air distribution system optimum structural design of the combustion chamber in a vehicle-used vaporized/mixed fuel heater was done in this paper. With the k-ε model, the influence of structure such as diameter, amount, position and direction of the inlet holes on flow field was simulated by software FIRE. The simulating results show that the central swirl coexists with the circumferential swirl in the chamber, and the latter is the main carbon formation area because the velocity is slow. An optimum structural design was put forward which could make the central swirl larger and the circumferential swirl smaller synchronously. The accumulated carbon in chamber necking down and wall decreases obviously.

关 键 词：内燃机 汽车加热器 燃烧室 流场 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]