液压自由活塞发动机直流扫气设计及优化研究

发布时间：2017-12-30 23:42

本文关键词：液压自由活塞发动机直流扫气设计及优化研究　出处：《内燃机工程》2016年06期 　论文类型：期刊论文

【摘要】：基于气门-气口直流扫气方式的设计及自由活塞本身运行特点设计了液压气门的控制策略,通过试验对气门控制策略进行了验证并获取了缸内压力及活塞运行曲线。将获取的部分试验数据作为三维仿真的边界条件,通过AVL FIRE ENGINE PLUS建立的三维仿真模型探讨了排气门正时、气口高度及扫气压力对给气比、捕获率及扫气效率的影响规律。在此基础之上,提出了一种基于给气比、捕获率及扫气效率的优化函数,优化计算结果表明:当扫气压力ps为0.16MPa、扫气口高度hs为26mm、排气门开启角EVO为48mm时,液压自由活塞发动机最大扫气效率ηs可达到84.7%。
[Abstract]:The control strategy of hydraulic valve is designed based on the design of direct current scavenging mode of valve and the operation characteristics of free piston. The valve control strategy is verified by experiments and the cylinder pressure and piston operating curve are obtained. Some of the test data obtained are taken as the boundary conditions of 3D simulation. Through the three-dimensional simulation model established by AVL FIRE ENGINE PLUS, the timing of the exhaust valve, the height of the vent and the ratio of the scavenging pressure to the feed gas are discussed. On the basis of this, an optimized function based on feed gas ratio, capture rate and scavenging efficiency is proposed. The optimized calculation results show that when the scavenging pressure PS is 0.16MPa, the height of the scavenging port is 26mm and the opening angle of the exhaust valve is 48mm. The maximum scavenging efficiency 畏 s of hydraulic free piston engine can reach 84.7.
【作者单位】：北京理工大学机械与车辆学院;
【基金】：高等学校博士学科点专项科研基金项目(20131101120019)
【分类号】：TK402
【正文快照】： 0概述自由活塞发动机具有较高的循环热效率及先进的电控技术使其成为国内外学者研究的热点[1-4]。单从扫气方式来看可以分为直流扫气与回流扫气两大类,其中直流扫气又分为气门-气口直流扫气[2]与气口-气口直流扫气[3]。本文研究对象为气门-气口扫气方式的液压自由活塞发动机(H

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