Numerical Simulation of Three-Dimensional Cavitation Around a Hydrofoil
Numerical Simulation of Three-Dimensional Cavitation Around a Hydrofoil
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DOI：
10.1115/1.4004385
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发表时间：
2011-08
影响因子：
2
通讯作者：
Jing Yang;Lingjiu Zhou;Zhengwei Wang
中科院分区：
文献类型：
--
作者：
Jing Yang;Lingjiu Zhou;Zhengwei Wang
绕水翼的空泡具有明显的三维特征。采用全空化模型和修正湍流粘性系数的RNG k―e湍流模型，并将其与空化区汽液密度相关联，对绕水翼的空化进行了数值模拟，重点研究了空化的三维特征。本文对NACA66翼型在6 °攻角下的三维绕流流场进行了计算。结果表明，三维水翼的脱落频率与实验结果吻合较好。计算结果也反映了三维空泡的主要特征，即由于展向速度的影响，空泡呈月牙形。这种跨向速度是由于隧道侧壁附近的横向涡流引起的跨向压力梯度。
Cavitation around a hydrofoil has significant three-dimensional features. The full cavitation model and a RNG k―e turbulence model with a modified turbulence viscosity coefficient and which related to the vapor and liquid densities in the cavitating region were used to simulate cavitation around a hydrofoil, with emphasizing on cavity's three-dimensional features. Computations were made on the three-dimensional flow field around a NACA66 hydrofoil at a 6 deg angle of attack. The results show that the shedding frequency on the 3D hydrofoil agrees well with the experimental data. The computed results also capture the main feature of the 3D cavitation, which had a crescent shaped cavity because of the span wise velocity. This span wise velocity is due to the span wise pressure gradient caused by the lateral vortex near the side wall of the tunnel.