滚流强度对LPG发动机混合气形成的影响  

The effects of the tumble on the formation of stratified mixture structure in a liquid phase LPG injection engine

作　　者：杨杰[1] 蔡少娌[2] 齐运亮[3] 耿德强[3] 许伯彦[3] 

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]济南大学机械工程学院,山东济南250022 [3]山东建筑大学机电工程学院,山东济南250101

出　　处：《山东建筑大学学报》2009年第5期396-401,共6页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(50576047);清华大学汽车安全与节能国家重点实验室开放基金项目(KF2007-08);山东省自然科学基金项目(Y2006F02)

摘　　要：通过与实验结果比较,在验证了所提出解析方法可行性的基础上,采用计算机数值解析方法研究了两种不同进气阀升程曲线下,火花点火进气道LPG喷射发动机的缸内滚流强度和不同燃料喷射期时对分层混合气构造的影响。结果表明:滚流在压缩行程初期形成,在接近压缩过程上止点时,虽然燃烧室中心区域依然残存部分滚流,但其它区域滚流已经畸变、破碎成众多小尺度涡流。并且在较小的进气阀升程曲线下的进气过程形成的滚流强度也较大,此时再配合在进气行程中后期喷射更容易形成分层混合气构造。The effects of the tumble are investigated under two different intake valve lift curves and the different injection timing on the formation of stratified mixture based on validated computational method through comparing the computational result of an existing case with the corresponding experiment. The results show that the tumble is formed at the initial stage of the compression stroke. At the end of compression, although a part of residual tumble vortex still exist in the central part of the combustion chamber, the tumble in other parts of the combustion chamber breaks into small vortices and eddies. The stronger tumble could be formed under a smaller intake valve lift in the intake process, and thus the stratified mixture could be more easily formed under intermediate and later stage of intake stroke.

关 键 词：稀薄分层燃烧 CFD 滚流 数值模拟 LPG 

分 类 号：TK432[动力工程及工程热物理—动力机械及工程]