同济大学学报（自然科学版）2013，Vol.41Issue(4)：565-570,582,7.DOI:10.3969/j.issn.0253-374x.2013.04.014
喷油开始时刻对缸内直喷汽油机性能的影响
Start of Injection Impacts on Performance of a Direct-injection Spark-ignition Engine
摘要
Abstract
A numerical simulation was carried out on cylinder flow, mixture formation and combustion process of a turbo-charged gasoline direct injection engine, and then on the basis of the test data about the break specific fuel consumption, emission and combustion, an analysis was made of the best time to start the injection on engine performance.The results show in the case of 5 000 r·min-1, the injection started at 400° crank angle obtains an optimal mixture formation, when it presents the best fuel economy and combustion stability with distribution, the higher turbulence kinetic energy around the spark plug at spark time and the shortest 10% ~90% burning duration as well as the lower HC emission.While the best time to start the injection is retarded at 30° crank angle with 2 000 r·min-1.When the injection starts in advance, the wall film increases, and the decreased equivalence ratio and the lower turbulence kinetic energy around spark lead to a lower burning rate, so HC emissions, fuel economy and combustion stability may go bad.The same situation occurs in a delayed injection, the mixture uniformity worsens at spark time because of insufficient mix, consequently engine performance is deteriorated.关键词
喷油开始时刻/汽油缸内直喷/喷雾/燃烧/排放Key words
start of injection/ gasoline direct injection/spray/ combustion/ emission分类
能源科技引用本文复制引用
韩文艳,许思传,周岳康,任健康..喷油开始时刻对缸内直喷汽油机性能的影响[J].同济大学学报（自然科学版）,2013,41(4):565-570,582,7.
