›› 2012, Vol. 42 ›› Issue (04): 871-876.
胡宗杰1, 肖春江1, 李治龙1, NilsHaneklaus1,2, 龚慧峰1, 吴志军1
HU Zong-jie1, XIAO Chun-jiang1, LI Zhi-long1, NILS Haneklaus1,2, GONG Hui-feng1, WU Zhi-jun1
摘要: 基于超声雾化和载气输运技术,设计了速度、全局当量比可独立控制的碳氢燃料多液滴流制备系统。所生成的多液滴流能够更加真实地模拟内燃机喷雾外围液滴群的流动与混合状态。采用高亮度LED光源,并从90°角度拍摄多液滴流散射光,获得了不同空气流量(10、20、30、40 L/min)和正庚烷供给速度(150、200、250、300 mL/h)下的多液滴流高速摄影图片。发现多液滴流离开喷嘴管出口后可保持一段时间的单向稳定流动。空气卷吸和液滴挥发的共同作用导致稳定段长度随出口速度升高而先增大后减小。当喷嘴管出口液滴流速度低于5.2 m/s时,在稳定段之后将出现明显的空气卷吸漩涡,而且出口速度越低,漩涡越多且形状更加规则。离喷嘴管出口较远时,液滴扩散范围增大和燃料挥发可能导致采用散射光法已逐渐无法观测到多液滴流。
中图分类号:
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