Numerical simulation of unsteady cavitating flow on hydrofoil
Numerical simulation of unsteady cavitating flow on hydrofoil
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DOI：
10.3785/j.issn.1008-973x.2010.05.035
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Wang Le-qin Zhou Zhong-hai Wu Da-zhuan Hao Zong-rui
中科院分区：
文献类型：
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作者：
Wang Le-qin Zhou Zhong-hai Wu Da-zhuan Hao Zong-rui
采用改进的RNG k-e湍流模型，模拟了NACA0015型水翼在迎角为8°时的非定常空化流动，空化数为1和1.5，雷诺数为3×105。得到了非定常空化流的结构及其演化过程的流动特性。结果表明，再入射流在空腔的萌生和发展过程中起着重要作用。空洞首先出现在前缘。在同一位置形成的顺时针旋涡沿水翼表面向下游移动。空泡逐渐长大并从水翼脱落，脱落位置随空泡数的不同而不同。空腔的产生和发展过程伴随着压力的波动。大空化数空化流的压力波动幅度和频率明显大于小空化数空化流。
The unsteady cavitating flow around an NACA0015 hydrofoil at an angle of attack of 8°was simulated by a modified RNG k-e turbulence model with two different cavitation numbers of 1 and 1.5,and the Reynolds number of 3×105. The structure of unsteady cavitating flow was obtained and so were the flow characteristics of its evolution process. Results show that the re-entrant jet plays an important role in the initiation and development process of cavity. The cavity first appears in the leading edge. Then the clockwise vortex developed in the same location moves to downstream along the surface of hydrofoil. The cavity grows up gradually and sheds from the hydrofoil and the shedding locations are different according to the cavitation numbers. The initiation and development process of the cavity accompany the pressure fluctuation. The amplitude and the frequency of pressure fluctuation of cavitating flow with a large cavitation number are obviously greater than that with a smaller caviation number.