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。
This paper introduces the authors primary research results of the study of the DME spray characteristics under high fuel injection pressure.This work investigated the general 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.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2001年第1期10-14,共5页
Transactions of Csice
基金
内燃机燃烧学国家重点实验室开放基金
关键词
二甲基醚
喷雾特性
试验
柴油
Dimethyl ether (DME)
Spray characteristics
Spray penetration
Spray angle
