湖南大学学报（自然科学版）2016，Vol.43Issue(2)：64-69,6.
LNG 发动机低速工况下瞬态燃烧过程试验研究
Experimental Study on the Transient Combustion Process of LNG Engine under Low-speed Conditions
摘要
Abstract
A test was conducted on a liquefied natural gas (LNG)turbocharged engine in the transient process of low-speed working condition.By secondary treating the measured transient cylinder pressure curve,various combustion state parameters were obtained.On this basis,the internal relation among these transient combustion characteristic parameters and the effect of these parameters on LNG engine perform-ances were analyzed.The results have shown that the variation range of 50% of the burnt point with the cycle number is about 5 o CA,and its fluctuation is mainly caused by the change of the combustion starting point.The peak values of 50% of the burnt point correspond to those of the combustion starting point, and so do the valley values.The peak values of 50% of the burnt point correspond to the valley values of maximum pressure rise rate and maximum cylinder pressure,whereas the opposite is true.The variation range of 10%~90% of the combustion duration is 30 ~45 o CA,and the rise of combustion duration be-comes one of the main reasons for the decline of LNG engine IMEP (indicated mean effective pressure)and NMEP (net mean effective pressure).The fluctuations of combustion characteristic parameters are mainly caused by the instability of the combustion start point.To precisely control the combustion start point be-comes an effective way to ensure that LNG engine has good transient performances at low speed and high intake pressure working condition.关键词
天然气/发动机/瞬态工况/燃烧/台架试验Key words
natural gas/internal combustion engine/transient condition/combustion/bench test分类
能源科技引用本文复制引用
付建勤,刘敬平,阳辉勇,徐伟,廖诚..LNG 发动机低速工况下瞬态燃烧过程试验研究[J].湖南大学学报（自然科学版）,2016,43(2):64-69,6.基金项目
国家自然科学基金资助项目（51376057），National Natural Science Foundation of China（51376057）；国家重点基础研究发展计划（973计划）资助项目（2011CB707201）；国家高技术研究发展计划（863计划）资助项目 （）
