撞击平板壁面的柴油喷雾的燃油分布研究  

Study on Fuel Distribution of Diesel Spray Flat Wall Impingements

作　　者：毛立伟[1,2] 苏万华[1] 裴毅强[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]中国第一汽车股份有限公司无锡油泵油嘴研究所,无锡214063

出　　处：《内燃机工程》2016年第6期98-104,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(50636040)

摘　　要：利用复合激光诱导荧光(PLIEF)技术,在一个高温高压定容弹内研究了柴油喷雾撞击平板后的燃油分布。研究结果表明:撞壁对燃油分布有重要影响。撞壁喷雾可以分为:(1)气液相喷雾同时撞壁,在近壁面形成近壁浓区,瞬时最大燃空当量比(Φmax)和最低温度(Tmin)存在于撞壁点附近;(2)气相喷雾撞壁液相喷雾不撞壁,近壁面当量比相对较高,Φmax和Tmin存在于撞壁点上方的自由射流段中;(3)气液相喷雾都不与壁面接触,相当于自由喷射。随着撞壁距离的增加,液相燃油质量分数增加,Φ>2的过浓区间的气相燃油质量分数减小,1<Φ≤2的较浓区间的气相燃油质量分数增加到一定数量并保持变化不大,0<Φ≤1的稀混合气区间的气相燃油质量分数逐渐增加。The Laser Induced Exciplex Fluorescence （PLIEF）：technique was used to quantitatively study the fuel distribution of diesel spray flat wall impingements in a constant volume bomb. It is found that, the spray wall impingements have an important impact on the fuel distribution. The spray wall impingements can be divided into three types： （1） the vapor-liquid phase spray wall co-impingements, with a rich mixture zone near the wall and transient maximum fuel-air equivalent ratio （φmax） and minimum temperature （Train） near the impingement point; （2） only vapor phase spray wall impingements with a high fuel-air equivalence ratio near the wall and φmax/Tmin in the free jet section above the impingement point; （3） no vapor nor liquid phase spray wail＇impingement, just like a free jet. With an increase in impinging distance, the mass fraction of liquid phase fuel increase, and the mass fraction of vapor phase fuel will decrease in the excessively rich mixture area of φ〉2 while in the richer mixture area of 1〈φ≤2, it still increase to a certain value and then keep unchanged, and in the lean mixture area of 0〈φ≤l, it still gradually increase.

关 键 词：内燃机 柴油喷雾 撞壁 燃油分布 复合激光诱导荧光 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]