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| Comparison and analysis of turbulence models for numerical simulation of cavitation flow in hydrofoil with gap |
| LU Yuheng1, RAN Hongjuan1*, SHI Tianjiao2,LIU Yong1, QIAN Xinru1 |
| 1. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Nuclear Power Institute of China, Chengdu, Sichuan 610213, China |
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Abstract The CFD method was used to analyze the flow around a hydrofoil with a gap to compare the effects of different turbulence models on the calculation of clearance leakage cavitation and the flow characteristics. Hydrofoils with different angles of attack and clearances were selected and three commonly used turbulence models were chosen to calculate the cavitation caused by clearance leakage vortex. The results show that the density correction method RNG k-ε model is more accurate in predicting the shape of leakage cavitation and the velocity distribution in the main direction near the leakage vortex. Under the influence of wall conditions and airfoil wake, the velocity in the main direction at the location of leakage vortex has a larger value when the gap is 10 mm. For a small clearance, the shear cavitation inside the airfoil clearance is stronger, and the leakage cavitation above the airfoil is farther from the upper surface of the airfoil. When the clearance is increased to 10 mm, the vortex is allowed to develop for a longer distance and collapse more slowly. The fillet of the airfoil tip can guide the clearance flow to a certain extent, which makes the velocity distribution inside and near the clearance more uniform. The fillet can also have an effect on the location where the cavitation occurs.
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Received: 28 November 2018
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