柏金,孙思楠,王谦.进排气结构参数对微型自由活塞发动机扫气过程影响的数值模拟研究[J].内燃机工程,2021,42(5):42-51.
进排气结构参数对微型自由活塞发动机扫气过程影响的数值模拟研究
Numerical simulation study on the influence of intake and exhaust structure parameters on scavenging process of micro-free piston engine
DOI：10.13949/j.cnki.nrjgc.2021.05.007
关键词:微型自由活塞发动机  扫气过程  扫气效率  间距  倾角  孔径  
Key Words:micro-free piston engine  scavenging process  scavenging efficiency  distance  angle  diameter  
基金项目:国家自然科学基金重点项目(No.51606088和51876083));江苏大学高级人才科研启动14JDG146
作者单位E-mail
柏金* 江苏大学 能源与动力工程学院 perking@aliyun.com 
孙思楠 江苏大学 能源与动力工程学院  
王谦 江苏大学 能源与动力工程学院  
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摘要:在微型自由活塞动力装置单缸压燃的研究下，结合单次冲击燃烧可视化试验，针对简化模型的进、排气口间距L、进气道倾角α、排气道倾角β，进气道孔径Din以及排气道孔径Dout展开数值模拟计算以应用于双气缸研究中，使整个运行工况更加平稳且高效。当进、排气口间距不断增大，其换气过程的扫气效率逐渐下降；同时，进气口与排气口的扫气角成一定夹角时，在燃烧室内形成气流涡旋，可以提高其扫气效率。当进、排气道孔径不断增大时，扫气效率呈现先上升后下降的趋势，也进一步说明孔径对其扫气过程有明显影响。分析表明进、排气结构最佳设计尺寸为：进、排气口间距取1mm，进气道倾角取30°，排气道倾角取60°，进气道孔径为0.5mm，排气道孔径为0.6mm，该设计尺寸为研究微型自由活塞发动机进排气结构的往复运动做了理论铺垫。
Abstract:In the micro free piston cylinder pressure power plant under the study of combustion, combined with a single impact combustion visualization test, simplified model for intake and outake of the distance L, intake angle α, exhaust angle β, exhaust diameter Din and Dout conduct numerical simulation to study, applied to double cylinder to make the operation more smooth and efficient. When the distance between intake and exhaust ports increases, the scavenging efficiency of air exchange process decreases gradually. At the same time, when the scavenging angle of the intake and exhaust ports becomes a certain Angle, an airflow vortex is formed in the combustion chamber, which can improve the scavenging efficiency. When the aperture of inlet and exhaust ports increases, scavenging efficiency increases first and then decreases, which further indicates that the aperture has a significant effect on the scavenging process. The analysis shows that the optimal design size of the intake and exhaust structure is as follows: the distance between the intake and exhaust ports is 1mm, the inclination angle of the intake port is 30°, the inclination angle of the exhaust port is 60°, the intake port diameter is 0.5mm, and the exhaust port diameter is 0.6mm. This design size provides a theoretical foundation for the study of the reciprocating movement of the intake and exhaust structure of the micro-free piston engine.
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