内燃机气道及缸内气体流动特性研究  

STUDY OF THE FLOW CHARACTERISTICS OF THE INLET PORTS AND IN-CYLINDER FOR INTERNAL COMBUSTION ENGINE

作　　者：王天友[1] 刘大明[1] 沈捷[2] 韩义勇[2] 金成吉[2] 朱杰[2] 谷峪[2] 刘书亮[1] 姜泽军[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]广西玉柴机器股份有限公司,广西玉林537005

出　　处：《工程热物理学报》2008年第4期693-697,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No．50576063)

摘　　要：本文对某型号内燃机气道稳态流动和缸内气流运动特性进行了研究.气道流动特性稳态计算结果与气道稳流试验结果相吻合,流动特征参数偏差在3%左右.瞬态计算结果表明,在进气行程初期,缸内涡流和湍流迅速增强,随后涡流变化缓慢,而湍流强度迅速下降.在气门叠开时,存在进气和排气回流现象.进气时,进气阀边缘处是缸内气体最大速度出现位置,气门最大升程时该处速度达到134.4 m/s;切向气道缩口处最大速度高达134.7 m/s,此处存在一定的进气节流损失.The transient and steady-state three-dimensional numerical simulation of air flows in inlet ports and cylinder of a practical four-valve diesel engine was performed in this paper. The results of steady-state simulation are in good agreement with its test results, and the deviation is at about 3%. It is found from the transient simulation results that the swirl and turbulence are enhanced in earlier stage of reduction, and then the variety of swirl is slow, but the turbulence drops quickly. There is the intake and exhaust backflow phenomenon during the valve overlap. The maximum speed appears at the edge of the intake valves during the reduction, and when it is at the highest valve lift, the speed reaches 134.4 m/s; the speed of tangential intake port necking also reaches 134.7 m/s, and in this place there is certain intake throttle loss.

关 键 词：内燃机 气道稳流试验 多维数值模拟 缸内气体流动 

分 类 号：TK124[动力工程及工程热物理—工程热物理]