小型二冲程汽油机气口主要参数的计算和确定  

Calculation and Determination of Main Parameters for Ports of Small Two Stroke Gasoline Engines

作　　者：史宗庄[1] 

机构地区：[1]天津大学天津内燃机研究所,天津300072

出　　处：《小型内燃机》2000年第3期16-24,共9页

摘　　要：本文以气口的比时面值为中心 ,系统地介绍了化油器式曲轴箱回流扫气小型二冲程汽油机对称配气正时气口各个主要参数的计算和确定问题。首先介绍了所需要的气口比时面值的计算和确定方法 ,其中对最早由A·C·奥尔林提出 ,现被我国内燃机教科书和设计手册采用 ,由气体流量方程式推导出的计算公式进行了修正 ,使其计算结果与现有小型二冲程汽油机的现实数据相一致。随后介绍了一种已知结构和运转参数 ,计算比时面值的新方法———系数计算法。最后介绍了由给定比时面值计算其所需气口配气相位角和气口高度的方法 。This paper introduces systematically calculation and determination of main parameters for symmetrically timing ports of small two stroke gasoline engines with carburetor and crankcase loop scavenging.The emphasis is specific time area values of the ports.First,it introduces the calculation and determination methods for the desired specific time area values of the ports.The formula,which is derived from gas flow equations and proposed by Aurin A C first and adopted by our teaching books and design manuals for engines,is revised.Therefore the calculated results agree with the practical data of the present small two stroke gasoline engines.Then it explains a method of calculation from coefficients——a new method for specific time area value calculation from the known structural and operational parameters.Finally,it introduces the calculation of the desired timing angles and heights of the ports from the given specific time area values.

关 键 词：二冲程汽油机 比时面值 气口 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]