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Pulse pressure loading and erosion pattern of cavitating jet
Engineering Applications of Computational Fluid Mechanics ( IF 6.1 ) Pub Date : 2019-11-26 , DOI: 10.1080/19942060.2019.1695675
B. Liu 1 , Y. Pan 1 , F. Ma 1
Affiliation  

Various erosion patterns generated through the cavitating water jet impacts under ambient pressure conditions were investigated in experiments and numerical simulations. A series of normalized stand-off distances ls/do ∈ [2.5 13.5] were studied during the erosion acceleration period. Two ring-like erosion areas were observed for comparatively low ls/do ∈ [2.5 6.5]. To gain insight into the pulse pressure loading on the erosion area, numerical calculations were performed using the volume of fluid (VOF) interface capturing methodology combined with the large-eddy simulation turbulence model. The erosion patterns are clarified based on the mass loss and distribution features of the eroded regions. The first ring, generated by the cavitation clouds impingement outside the central stagnation area, mainly contributes to the mass loss. The second ring moves inward, merges into the inner ring and eventually vanishes with increasing ls/do. High pressure pulsation is found around the locations of the maximum erosion and the approximate intermediate radius of the second ring. The pressure pulsation in the first ring area are dominated by the frequency of the vortices shedding from the jet nozzle. Several higher frequencies are found as the spectral features of the eroded regions in each pattern.



中文翻译:

空化射流的脉冲压力加载与冲蚀模式

在实验和数值模拟中研究了在环境压力条件下通过空化水射流冲击产生的各种侵蚀形式。一系列标准化的对峙距离s/dØε[2.5 13.5]在侵蚀加速期进行了研究。观察到两个环形侵蚀区域,相对较低s/dØ∈[2.5 6.5]。为了深入了解侵蚀区域的脉冲压力负荷,使用流体体积(VOF)界面捕获方法结合大涡流模拟湍流模型进行了数值计算。根据侵蚀区域的质量损失和分布特征,可以弄清侵蚀模式。由空化云撞击中心停滞区域外而产生的第一环主要是质量损失。第二个环向内移动,合并到内环中,并最终随着消失而消失s/dØ。在最大腐蚀和第二环的近似中间半径的位置附近发现高压脉动。第一环区域中的压力脉动主要由从喷嘴喷出的涡流的频率决定。发现了几种更高的频率作为每个图案中侵蚀区域的光谱特征。

更新日期:2020-04-20
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