Effects of cavitation in a nozzle on liquid jet atomization
Effects of cavitation in a nozzle on liquid jet atomization
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DOI：
10.1016/j.ijheatmasstransfer.2006.12.033
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
Akira Sou;S. Hosokawa;A. Tomiyama
中科院分区：
文献类型：
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作者：
Akira Sou;S. Hosokawa;A. Tomiyama
利用高速摄像机对二维喷嘴内的空化和喷嘴出口附近的液体射流进行了可视化，研究了不同空化和雷诺数σ、Re条件下空化对液体射流的影响。采用激光多普勒测速仪测量了喷嘴内液体速度，研究了空化对喷嘴内流动和液体射流的影响。研究结果表明：（1）喷嘴内的空化和液体射流可分为四个阶段：（无空化，波浪射流），（发展中的空化、波状射流），（超空化，喷雾）和（水力翻转，翻转射流），（2）喷嘴出口附近的液体射流取决于空化状态，（3）雷诺数对空泡和射流的影响不大，而主要受σ的影响;（4）出口附近空泡云溃灭引起的强烈湍流对韧带的形成起着重要作用。
Cavitation in two-dimensional (2D) nozzles and liquid jet in the vicinity of the nozzle exit were visualized using high-speed cameras to investigate the effects of cavitation on liquid jet under various conditions of cavitation and Reynolds numbers σ and Re. Liquid velocity in the nozzle was measured using a laser Doppler velocimetry to examine the effects of cavitation on the flow in the nozzle and liquid jet. As a result, the following conclusions were obtained: (1) cavitation in the nozzles and liquid jet can be classified into the four regimes: (no cavitation, wavy jet), (developing cavitation, wavy jet), (super cavitation, spray) and (hydraulic flip, flipping jet), (2) liquid jet near the nozzle exit depends on cavitation regime, (3) cavitation and liquid jet are not strongly affected by Re but by σ, and (4) strong turbulence induced by the collapse of cavitation clouds near the exit plays an important role in ligament formation.