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环状出口气泡雾化喷嘴研究
引用本文:刘联胜,杨华,吴晋湘,闫运忠.环状出口气泡雾化喷嘴研究[J].工程热物理学报,2005,26(1):155-158.
作者姓名:刘联胜  杨华  吴晋湘  闫运忠
作者单位:河北工业大学能源与环境学院,天津,300132
摘    要:本文对环状出口气泡雾化喷嘴出口下游液膜的破碎过程进行了研究,发现气体的介入是促使液膜破碎的主要原因。利用DUALPDA对其下游流场的速度分布、颗粒直径分布以及通量分布进行了实验测量。发现喷嘴出口附近主流区域存在大量具有负向速度的颗粒,并且此处的颗粒平均直径显著减小,为气泡雾化机理提供了佐证;在喷嘴出口下游轴心处液雾呈现逆向流动趋势,证明此处存在负压回流;沿轴向的速度分布曲线与颗粒直径分布曲线的变化趋势说明气泡"爆炸"发生在出口下游5-15 mm距离内。

关 键 词:气泡雾化  喷嘴  速度分布  平均直径分布
文章编号:0253-231X(2005)01-0155-04
修稿时间:2003年3月22日

STUDIES ON THE ANNULAR-SPOUT EFFERVESCENT ATOMIZER
LIU Lian-Sheng,YANG Hua,WU Jin-Xiang,YAN Yun-Zhong.STUDIES ON THE ANNULAR-SPOUT EFFERVESCENT ATOMIZER[J].Journal of Engineering Thermophysics,2005,26(1):155-158.
Authors:LIU Lian-Sheng  YANG Hua  WU Jin-Xiang  YAN Yun-Zhong
Abstract:Experimental studies are made on the breakup of liquid sheet spurted from the annular spout effervescent atomizer. The squeeze of air in spout and the exploding of bubbles downstream the orifice dominate the breakup processes of liquid sheet. Velocity profile, drop-size distribution and flux distribution downstream the discharge were measured with DUAL PDA. Near the main flow of spray, there are many drops with negative velocity and the average drop-size decreases distinctly. That is caused by the exploding of large number of bubbles, and proves the effervescent mechanism. Because of the circumfluence downstream the spout, the spray near the axes flow backwards. The distribution of SMD and velocity of drops reveal that the bubbles explode at 5 to 15 millimeter down the spout.
Keywords:effervescent atomization  atomizer  velocity profile  distribution of SMD
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