Analysis of sheet cavitation with bubble/bubble interaction models
Analysis of sheet cavitation with bubble/bubble interaction models
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DOI：
10.1063/1.5095781
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发表时间：
2019-07
影响因子：
4.6
通讯作者：
M. Adama Maiga;O. Coutier-Delgosha;D. Buisine
中科院分区：
文献类型：
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作者：
M. Adama Maiga;O. Coutier-Delgosha;D. Buisine
作者Adama Maiga、Coutier-Delgosha和Buisine最近提出了一种基于气泡/气泡相互作用的新空化模型[“基于气泡-气泡相互作用的新空化模型”，Phys. Fluids 30，123301（2018）]。该模型包含了气泡间的所有非线性相互作用项，仅输入局部速度散度，而经典的Rayleigh-Plesset或Gilmore模型只考虑了气泡间的线性相互作用项，需要局部压力的演化。在之前的出版物中，该模型已经针对单个气泡生长和崩溃的情况进行了验证。在本文中，相同的模型被应用到配置的高速空化流的文丘里型线和二维翼型部分，其中实验的基础上的X射线成像最近已经进行。基于两种情况下的流速场，计算了局部速度发散，并提取了从前缘到空腔尾流的一维平均发散演化，并将其用作模型验证的输入。最大汽泡和汽相体积的变化规律与实验结果吻合较好。然后定义一个典型的速度发散演化，并将我们的模型与包括多个气泡之间相互作用的修改后的Rayleigh-Plesset方程进行比较。它证实了最大气泡的半径演化是系统地更好地估计新模型，由于它的能力，不断考虑到大气泡与小气泡的相互作用。最后，该模型被用来调查的尺度效应，通过应用6个不同的时间尺度的空化发展覆盖超过5个数量级。研究表明，气泡大小并不与尺度成比例变化，而是根据经验确定的规律变化。作者Adama Maiga、Coutier-Delgosha和Buisine最近提出了一种基于气泡/气泡相互作用的新空化模型[“A new Cavitation model based on bubble-bubble interactions，”Phys. Fluids 30，123301（2018）]。该模型包含了气泡间的所有非线性相互作用项，仅输入局部速度散度，而经典的Rayleigh-Plesset或Gilmore模型只考虑了气泡间的线性相互作用项，需要局部压力的演化。在之前的出版物中，该模型已经针对单个气泡生长和崩溃的情况进行了验证。在本文中，相同的模型被应用到配置的高速空化流的文丘里型线和二维翼型部分，其中实验的基础上的X射线成像最近已经进行。根据这两种情况下的流场，计算了局部速度散度，并得到了从前缘到尾缘的一维平均散度的演化。
A new cavitation model based on bubble/bubble interactions has been recently proposed by the authors Adama Maiga, Coutier-Delgosha, and Buisine [“A new Cavitation model based on bubble-bubble interactions,” Phys. Fluids 30, 123301 (2018)]. It includes all nonlinear interaction terms between two bubbles, and the only input is the local velocity divergence, while the classical Rayleigh-Plesset or Gilmore models only take into account the linear interaction terms and require the local pressure evolution. In this previous publication, the model has been validated against cases of single bubbles growths and collapses. In the present paper, the same model is applied to configurations of high-speed cavitating flow on a Venturi profile and a two-dimensional foil section, where experiments based on X-ray imaging have been recently conducted. Based on the flow velocity fields available in the two cases, the local velocity divergence is calculated, and a one-dimensional mean divergence evolution from the leading edge to the wake of the cavity is extracted and used as an input for the model validation. The evolutions of the biggest bubble and the volume of vapor are both found in good agreement with the experiments. A typical velocity divergence evolution is then defined, and our model is compared to the modified Rayleigh-Plesset equation that includes the interactions between multiple bubbles. It confirms that the radius evolution of the biggest bubble is systematically better estimated by the new model due to its capability to continuously take into account the interactions of big bubbles with smaller bubbles. Eventually, the model is used to investigate the scale effect, by applying 6 different time scales of cavitation development covering more than 5 orders of magnitude. It is shown that the bubble size does not vary proportionally to the scale, but according to a law that is empirically determined.A new cavitation model based on bubble/bubble interactions has been recently proposed by the authors Adama Maiga, Coutier-Delgosha, and Buisine [“A new Cavitation model based on bubble-bubble interactions,” Phys. Fluids 30, 123301 (2018)]. It includes all nonlinear interaction terms between two bubbles, and the only input is the local velocity divergence, while the classical Rayleigh-Plesset or Gilmore models only take into account the linear interaction terms and require the local pressure evolution. In this previous publication, the model has been validated against cases of single bubbles growths and collapses. In the present paper, the same model is applied to configurations of high-speed cavitating flow on a Venturi profile and a two-dimensional foil section, where experiments based on X-ray imaging have been recently conducted. Based on the flow velocity fields available in the two cases, the local velocity divergence is calculated, and a one-dimensional mean divergence evolution from the leading edg...