柴油喷雾撞壁特性的定量研究  

Quantitative Study of Impingement Characteristics of Diesel Spray

作　　者：毛立伟[1] 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

出　　处：《燃烧科学与技术》2015年第6期521-529,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50636040)

摘　　要：在一个定容弹里,利用复合激光诱导荧光(PLIEF)技术定量研究了柴油喷雾撞击平板后的燃油分布.研究发现,在气、液相喷雾同时撞壁的条件下气相喷雾瞬态最大当量比出现在撞壁点附近,瞬态最低温度出现在瞬态最大当量比位置并与其发展规律截然相反.撞壁后气相壁面贯穿距离和壁面高度随时间发展逐渐增加,液相壁面贯穿距离和高度先随着时间增加而增大,到某一时刻后保持基本不变.气、液相壁面贯穿距离和壁面高度受各种参数的影响很大.根据实验数据,利用多元非线性回归法,拟合了可以较好预测气、液相壁面贯穿距离和壁面高度的经验公式.The planar laser induced exciplex fluorescence （ PLIEF ） technique was used to quantitatively study the fuel distribution of impinging ,Siesel spray in a constant volume bomb. It is found that the maximum transient equiva- lence ratio of impingement spray appears at the impingement position when vapor and liquid phase sprays impinge on the wall at the same time; that the minimum transient temperature occurs at the maximum transient equivalence ratio and shows an opposite trend. The vapor radial penetration distance and height increase gradually with time, while the liquid radial penetration distance and height first increase with time while and then remains unchanged after a certain moment. Both the vapor and liquid phase radial penetration distance and height are greatly affected by various parame- ters. According to the experimental data, the empirical formulas, which can better predict the vapor and liquid phase radial penetration distance and height, are fitted by the regression of multivariate nonlinear fitting.

关 键 词：柴油喷雾 撞壁特性 喷雾浓度和温度定量标定 壁面贯穿距离和壁面高度 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]