李冀辉，汪洋，徐帅卿，甄旭东，刘宇，胡耀辉.活塞运动规律对点燃式HFPE燃烧过程影响的仿真研究[J].内燃机工程,2017,38(6):23-28.
活塞运动规律对点燃式HFPE燃烧过程影响的仿真研究
Simulative Research of Impact of Piston Motion Law on Spark Ignition Hydraulic Free Piston Engine Combustion Process
DOI：
关键词:压自由活塞发动机；火花点燃；活塞运动规律；爆震  热功转换
Key Words:hydraulic free piston engine(HFPE)  spark-ignition  piston motion law  knock  thermal power conversion
基金项目:国家自然科学基金项目（51476113，51406135）
作者单位
李冀辉，汪洋，徐帅卿，甄旭东，刘宇，胡耀辉 1.天津大学 内燃机燃烧学国家重点实验室，天津 300072；2.潍柴动力股份有限公司 发动机技术研究院，潍坊 261000；3.天津职业技术师范大学 汽车与交通学院，天津 300222 
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摘要:使用仿真软件Converge，建立了点燃式液压自由活塞发动机(HFPE)的三维仿真模型。为了解决HFPE的爆震问题，提升其热效率，研究了不同活塞运动规律对HFPE的燃烧过程、爆震倾向与热功转换效率的影响。结果表明：火花点燃式HFPE的爆震燃烧发生在活塞边缘的末端混合气区域，是由若干个爆震核快速扩展而成，与曲柄连杆式火花点燃发动机爆震的发生地点和机理相同；通过改变活塞的运动规律，使活塞上行速度加快，在上止点附近停留时间变短，可以明显减小发动机的爆震倾向与爆震强度。利用优化的活塞运动规律，加上高达14的高压缩比，可以在一定程度上提升发动机的热功指示效率。
Abstract:A 3-D CFD model of spark-ignition hydraulic free piston engine(HFPE) was built by the simulation software of Converge. The impact of different piston motion laws on HFPE combustion process, knock tendency and thermal power conversion efficiency was investigated to control knock. The simulation results show that the knocking process of spark-ignition HFPE begins at the end of mixture region near piston edge. It's developed by the swift expansion of several knocking cores, and has the same location and mechanism as a crank-connecting-rod type spark-ignition engine does. By reducing piston mass, which can speed up the piston movement in compression stoke and reduce the duration near top dead center, the effect of decreasing knock tendency and intensity is obvious. Taking the advantage of mass-reduced piston movement together with high compression ratio (14), the engine thermal power conversion efficiency can be promoted to some extent.
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