第42卷第5期 2013年10月
小型内燃机与摩托车
SMALLINTERNALCOMBUSTION ENGINEAND MOTORCYCLE
某小型汽油机功率提升的试验研究周颖林漫群阎希成王雪雁王志东朱保华
（天津大学内燃机研究所天津300072）
Vol.42No.5 Oct.2013
摘要：针对某款典型小型汽油机提升额定功率的需求，选取另款高功率参考样机，在发动机动力台架上测试充量系数、机械效率，分析功率不足的原因，将提升功率的方向锁定在充量系数提升。通过 TJUEngineTUST105型稳流试验台试验，考察样机和参考样机的进排气系统零部件流通特性，结果表明样机仅消声器流动阻力高于参考样机。样机匹配参考样机消声器，功率有所提升。在此基础上，从提高进气系统动态进气量的角度增加进气管长度，利用进气波动提高进气充量。最终通过两机型反拖试验发现，冷机状态下二者进气充量系数基本相当，鉴于此，样机外特性试验中在进气道外表面少量喷水强制冷却，使样机额定功率达到目标值。
关键词：功率提升充量系数稳流试验
中图分类号：TK411*.3
文献标识码：A
文章编号：16710630(2013)05002604
Experimental Study on Power Improvementof a
DiminutiveGasolineEngine
Zhou Ying,Lin Manqun,Yan Xicheng,Wang Xueyan,Wang Zhidong,Zhu Baohua
Tianjin Intermal Combustion Engine Research Institute, Tianjin University (Tianjin, 300072, China)
Abstract:This paper, aiming at the power improvement of one typical diminutive gasolineengine, comparing with another higher power reference engine, charge coefficient and mechanical efficiency were tested and the facts of power inadequacy were analyzed.The improvement of charge coefficient was focused on.The compo-nents of inspiring and expiring system of both engine were tested separately on the TJUEngine TUST105 steady flow rig. The experimental results show that only muffler flow resistance of sample engine is poor than the ref-erence, After power was promoted by matching reference engine muffler, the length of intake pipe of the sam ple was increased to enhance the instant charge by utilizing intake fluctuation. On motoring condition, the charge coefficient was close to each other. Finally the target power was reached by additional cooling of the in take port surface.
Keywords:Power improvement, Charge coefficient, Steady flow experiment
引言
本文针对某款典型小型汽油机有进一步提升动力的设计要求，通过发动机台架试验的方法诊断样机的改进方向。为便于诊断的可操作性，与一款相同排量的高功率参考样机进行对标试验，分别进行功率摸底，并测取充量系数和机械效率，通过对试验结果的分析，
本文拟从提高充量系数的角度提升样机功率，并通过稳流试验台试验，对比两样机进排气系统零部件的流动特性，指导提升充量系数的具体环节。
样机状态及目标要求
样机与参考样机均为单缸机，相关技术参数参见表1。
作者简介：周颗（1977-），女，硕士，工程师，主要从事发动机工作过程分析研究。万方数据