压缩余隙对发动机性能的影响
杨海龙1,2，辛欣1,2，杨永春1,2，刘斌1,2，刘阳1,2，刘波1,2
1.内燃机可靠性国家重点实验室，山东 潍坊 261061;
2.潍柴动力股份有限公司发动机研究院，山东 潍坊 261061
摘要：为确定某柴油发动机压缩余隙设计范围，进行尺寸链公差分析、燃烧仿真分析、台架试验验证。通过尺寸链公差得出压缩余隙设计范围为1.08~1.32 mm；燃烧仿真分析结果表明，压缩余隙为0.8~1.4 mm，NOx排放、483烟度及燃油消耗率变化满足性能一致性要求；台架试验验证结果表明，压缩余隙为0.96~1.26 mm，NOx排放、483烟度及燃油消耗率的变化满足性能一致性要求。综合分析，发动机压缩余隙设计范围为0.96~1.26 mm。
关键词：压缩余隙；性能；一致性；公差
Influence of compression clearance on engine performance
YANG Hailong1,2, XIN Xin1,2, YANG Yongchun1,2,LIU Bin1,2, LIU Yang1,2, LIU Bo1,2
1.State Key Laboratory of Engine Reliability,Weifang 261061,China;
2.Engine Research Institute,Weichai Power Co., Ltd., Weifang 261061,China
Abstract：In order to determine the design range of compression clearance of a diesel engine, dimensional chain tolerance analysis, combustion simulation analysis, and bench test verification are carried out. The design range of compression clearance is 1.08~1.32 mm through the dimensional chain tolerance analysis. The combustion simulation analysis results show that the compression clearance is 0.8~1.4 mm, and the changes of NOx emission, 483 smoke value and fuel consumption rate meet the requirements of performance consistency. The bench test verification results show that the compression clearance is 0.96~1.26 mm, and the changes of NOx emission, 483 smoke value and fuel consumption rate meet the performance consistency requirements. Based on the above analysis, the design range of engine compression clearance is 0.96~1.26 mm.
Keywords:compression clearance; performance; consistency;tolerance
