燕山大学学报2018，Vol.42Issue(2)：110-118,9.DOI:10.3969/j.issn.1007-791X.2018.02.003
驻涡渠化活塞形貌对提升汽油机压缩比的数值模拟
Numerical simulation of standing vortex channelization piston shape for improving gasoline engine compression ratio
摘要
Abstract
Six combustion chambers belong to two types of standing vortex combustion chambers and standing vortex-channelization combustion chambers were got by building a compression ratio of 9 gasoline engine piston top shape, the compression ratio of standing vortex type and standing vortex-channelization type are 10,11,12 respectively.The ignition and combustion characteristics of each combustion chamber were studied by means of experiment and numerical simulation.Results show that,the cylinder peak pressure of standing vortex-channelization type is 7% lower than standing vortex type when compression ratio is 10,and the cylinder peak pressure of standing vortex-channelization type is also lower than standing vortex type when compression ratio is 11,but the turbulence intensity of standing vortex-channelization type is higher due to the formation of obvious tumble in the later stages of compression stroke.The separating combustion chamber space effect by piston top convex ridge of standing vortex-channelization type with compression ratio of 12 is remarkable, which can effectively influence the time and space dimension of ignition and combustion process,and the pressure rise rate peak value is also the highest in six combustion chambers.With the increase of compression ratio,the cylinder peak pressure,peak temperature and mean indicated pressure of standing vortex type and standing vortex-channelization type combustion chambers are increased,and the emissions are gradually better,but the cylinder peak pressure of standing vortex-channelization type is 21.5% higher than standing vortex type in the same of compression ratio.Therefore, reasonable design of the piston top shape can effectively organize the cylinder flow field and improve the ignition and combustion quality,it is an effective means to improve the compression ratio of gasoline engine with low cost.关键词
活塞形貌/高压缩比/燃烧控制/数值模拟Key words
piston shape/high compression ratio/combustion control/numerical simulation分类
能源科技引用本文复制引用
邸立明,赵鹏,孔凡树,齐田斌..驻涡渠化活塞形貌对提升汽油机压缩比的数值模拟[J].燕山大学学报,2018,42(2):110-118,9.基金项目
国家自然科学基金资助项目(51406174) （51406174）
河北省自然科学基金资助项目(E2014203066) （E2014203066）
