对置活塞二冲程发动机耗气特性研究

发布时间：2018-02-04 12:24

本文关键词： 内燃机对置活塞二冲程进气压力排气背压耗气特性　出处：《内燃机工程》2016年06期 　论文类型：期刊论文

【摘要】：针对对置活塞二冲程发动机对扫气效率优化和功率目标匹配的需求,基于试验和理论分析研究了发动机的耗气特性。采用试验数据和数学模型联合得到发动机的等效流量系数,分析了不同进排气参数、气口开启面积等对发动机耗气量的影响规律。研究结果表明:耗气量只由扫气压力、排气压力和绝热效率三个因素决定,与发动机转速无关;该发动机的等效流量系数近似等于0.272;不同曲轴转角所对应的流量系数与气口开启面积有关,当气口开启面积增加到一定值(4 500~4 668mm2),并继续增加时流量系数保持不变。
[Abstract]:In order to meet the need of optimization of scavenging efficiency and matching of power target for the two stroke engine with opposite piston. Based on the experimental and theoretical analysis, the gas consumption characteristics of the engine are studied. The equivalent flow coefficient of the engine is obtained by using the test data and the mathematical model, and the different inlet and exhaust parameters are analyzed. The results show that the gas consumption is determined only by three factors, i.e. scavenging pressure, exhaust pressure and adiabatic efficiency, and has nothing to do with engine speed. The equivalent flow coefficient of the engine is approximately equal to 0.272; The flow coefficient corresponding to different crankshaft rotation angles is related to the opening area of the air port. When the opening area of the air port increases to a certain value of 4500,4668mm ~ 2, the flow coefficient remains unchanged.
【作者单位】：北京理工大学车辆动力系统技术重点学科试验室;
【基金】：国家部委级基础研究项目(B2220110005)
【分类号】：TK401
【正文快照】： 0概述区别于四冲程发动机,OP2S发动机气缸中的废气不是被活塞推出气缸的而是由预先压缩到一定压力的空气扫除的。在没有增压低负荷低转速工况下,对置活塞二冲程发动机的扫气过程是不存在的,发动机很难起动甚至不能起动[1-2]。而增压器的匹配主要有三种方法:试验法、发动机耗气

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