燃料敏感性对部分预混燃烧影响的试验研究  

Experimental Investigation into Effect of Fuel Sensitivity on Combustion and Emissions of Partially Premixed Combustion

作　　者：郑尊清[1] 贺子晗 王浒[1] 王洋 尧命发[1] 张德福[2] ZHENG Zunqing;HE Zihan;WANG Hu;WANG Yang;YAO Mingfa;ZHANG Defu(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Maritime College,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津大学内燃机燃烧学国家重点试验室,天津300072 [2]天津理工大学海运学院,天津300384

出　　处：《内燃机工程》2019年第1期9-14,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51576138);天津科委一般项目(15JCYBJC21300)~~

摘　　要：配制辛烷值相同而敏感性不同的高辛烷值燃料,在一台改造的单缸试验发动机上进行了燃料敏感性对部分预混燃烧的燃烧和排放特性影响的研究。采用的不同敏感性的燃料为配制的甲苯参比燃料和市售92#汽油。研究结果表明:燃料敏感性越高,滞燃期越长,油气混合越充分,预混燃烧比例越大,NOx排放越高。燃烧重心(CA50)随着敏感性的增高先推迟后提前,敏感性为2的燃料CA50最迟。燃料敏感性越低,压升率越低,而市售92#汽油挥发性较强,预混比例较大,最大压升率最高;敏感性为2的燃料在上止点附近放热较多,指示热效率较高;汽油及敏感性为5和8的燃料的碳烟排放比其他燃料低。An experimental investigation was conducted into the effect of fuel sensitivity on combustion and emissions of partially premixed combustion on a modified single-cylinder testing engine fueled with different fuels of the same research octane number(RON)but different sensitivities.The fuels used were toluene reference fuels of different sensitivities of 0,2,5,8 and 11(with 11 the greatest),and a market gasoline with the RON of 92.The results indicate that with a fuel of higher sensitivity,the ignition delay is longer,the fuel/air mixture more homogeneous,and the premixed combustion stronger with more NO x.With the increase in fuel sensitivity,the CA50 first delays and then advances,resulting in the most delay of CA50 with the fuel having the sensitivity of 2.With a fuel of lower sensitivity,the rate of maximum pressure rise is smaller;but the rate of maximum pressure rise with the gasoline is the highest due to its stronger volatility and more premixed combustion.Moreover,with the fuel having the sensitivity of 2,the engine has the most heat release near top dead center,resulting in the highest thermal efficiency.With the gasoline and the fuels having the sensitivities of 5 and 8,engine soot is the lowest.The sensitivity of the gasoline with the RON of 92 is between 5 and 8.

关 键 词：甲苯参比燃料 部分预混燃烧 燃料敏感性 辛烷值 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]