二甲基醚(DME)喷雾一般特性的试验研究

尧命发  许斯都  金萍  王贺武  周龙保 

摘 要:介绍了在高压环境下对二甲基醚(DME)喷雾一般特性的试验研究结果,并与柴油的喷雾特性进行了比较。试验研究是在定容燃烧弹上进行的,用阴影法通过高速数字摄影机拍摄了二甲基醚和柴油的喷雾发展过程,应用计算机图像处理进行喷雾过程图像再现。研究结果表明:DME的喷雾贯穿距离比柴油小,喷雾锥角比柴油大;在喷雾自由发展过程中,DME的蒸发速度比柴油快;环境密度对DME喷雾特性的影响与柴油相似,即密度增大,锥角增大,贯穿距离减小。在燃烧室壁面附近,柴油的喷雾锥角迅速增大,而DME喷雾锥角几乎没有明显的变化。
关键词:二甲基醚(DME);喷雾特性;喷雾贯穿距离; 喷雾锥角
分类号:TK418.9 文献标识码:A

文章编号:1000-0909(2001)01-0010-05

An Experimental Study of the Dimethyl Ether (DME) General Spary Characteristic

YAO Ming-faNECL,Tianjin University,Tianjin 300072) 
XU Si-duNECL,Tianjin University,Tianjin 300072) 
JIN PingHebei Industry University) 
WANG He-wu(Xi'an Jiaotong University) 
ZHOU Long-bao(Xi'an Jiaotong University) 

AbstractThis paper introduces the authors primary research results of the study of the DME spray characteristics under high fuel injection pressure.This work investigated the genera l nature of DME injection for engine-like conditions in a constant volume combustion chamber.With the KODAK MotionCorder Analyzer,high speed motion pictures have been obtained.The results showed that the spray penetration of the DME was slower than that of diesel fuel,and the spray angle of the DME was wider than that of the diesel fuel.Compared with the diesel fuel spray,the DME evaporated much more rapidly in the free spray development,and the influence of the ambient gas pressure to the spray characteristics seemed the same as the diesel spray.The spray penetration decreased at high ambient pressure,but the spray angle increased at the same time.Near the chamber wall and impingement spray,the spray angle of the diesel fuel spray increased very fast,but that of the DME spray almost had no significant change.
Keywords
Dimethylether (DME);Spray character istics;Spray penetration;Spray angle

基金项目:内燃机燃烧学国家重点实验室开放基 金资助项目。
作者简介:尧命发(1968-),男,工学博士,助理研究员, 主要研究方向为内燃机燃烧过程及排放控制技术。
     尧命发(天津大学内燃机燃烧学国家重点实验室,天津 300072) 
     许斯都(天津大学内燃机燃烧学国家重点实验室,天津 300072) 
     金萍(河北工业大学) 
     王贺武(西安交通大学) 
     周龙保(西安交通大学) 

参考文献:

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收稿日期:2000年1月16日

修稿日期:2000年3月11日

出版日期:2001年1月1日