【摘要】 利用纹影光学系统和高速数码摄影机对定容燃烧弹内的新型代用燃料二甲基醚的喷雾和蒸发过程进行了系统的研究,并与柴油的喷雾和蒸发特性进行了比较。结果表明,二甲基醚的喷雾射程和锥角随环境参数变化的规律与柴油相似,但在相同条件下,二甲基醚的喷雾射程比柴油小,喷雾锥角比柴油大;二甲基醚的蒸发速度比柴油快。在喷雾的发展过程中,二甲基醚燃料在喷雾影像区域内的分布比柴油均匀。更多还原

【Abstract】 Spray characteristics and evaporating process of dimethyl ether(DME) fuel injected by a singlehole nozzle into a constant volume bomb at room temperature were investigated by using the schlieren optical system and a highspeed digital camera.Spray development photographs taken at different bomb pressures,injection pressures,nozzle hole diameters and injection quantities were analyzed and compared with those of diesel.Results show that DME spray has the similar development trend to the diesel spray with the variation of back pressure.However,spray tip penetration of DME is shorter and spray cone is wider than those of diesel.DME evaporation is much quicker than diesel spray,and concentration distribution of DME fuel in the spray is more uniform than that in the diesel spray.更多还原