Physical Modelling and Simulation of Leading Edge Cavitation : Application to an Industrial Inducer
Physical Modelling and Simulation of Leading Edge Cavitation : Application to an Industrial Inducer
复制标题
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Y. A. Bouziad;M. Farhat;Faiçal Guennoun;J. Kueny;F. Avellan;K. Miyagawa
中科院分区：
文献类型：
--
作者：
Y. A. Bouziad;M. Farhat;Faiçal Guennoun;J. Kueny;F. Avellan;K. Miyagawa
在本研究中，研究了两种用于空化模拟的CFD方法，并与三叶式工业诱导器的实验结果进行了比较。第一种模型是一种界面跟踪方法，第二种是VOF模型。研究发现，这两种模型都能很好地预测空化起始和主要空化尺寸。这两个模型也很好地预测了与头部下降相对应的阈值。研究还发现，空化引起的水头下降主要是由于能量损失的增加和供给能量的减少。此外，子午线分析表明，能量损失主要集中在空穴闭合下游的通道内。通过对流场的整体和局部分析，解释了水头下降的流体力学机理。事实上，前缘空化在到达喉部时会造成流动堵塞和流动不平衡。在前缘的压力侧，压力显著降低，从而允许空化的发生，从而影响能量传递。
In the present study, two CFD methods for cavitation modeling have been investigated and compared to experimental results in the case of 3-bladed industrial inducer. The first model is an interface tracking method and the second is a VOF model. It was found that both models allow a good prediction of the cavitation inception as well as the main cavity dimensions. The threshold corresponding to the head drop is also well predicted by both models. It was also found that the cavitation induced head drop is mainly due to an increase of energy losses and a decrease of the supplied energy. Furthermore, a meridian analysis of the rothalpy evolution clearly demonstrates that the energy losses are mainly located in the channel downstream to the cavity closure. The hydrodynamic mechanism of head drop is explained through a global and local analysis of the flow field. In fact, the leading edge cavitation causes a flow blockage as well as a flow imbalance as it reaches the throat. The pressure is significantly reduced at the pressure side of the leading edge, which allows cavitation occurrence and consequently influences the energy transfer.