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| Impact of hydrofoil surface water injection on cavitation suppression |
| WANG Wei, YI Qi, LIN Yin, XU Ruiduo, WANG Xiaofang |
| Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China |
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Abstract To study the effectiveness of hydrofoil surface water injection on cavitation suppression, the unsteady cavitating flow around a 2-D NACA0066(MOD)hydrofoil at attack of 8° was simulated by RNG k-ε turbulence model combined with the full-cavitation model with the jet-flow ratio at 0.1, 0.2, 0.3, respectively. The structure of unsteady cavitating flow and the trend of lift and drag coefficients were obtained. Results show that water injection can barrier the reentrant jet rushing from the trailing edge to the leading edge of the foil so as to thus weaken the frequency of bubble shedding, thereby suppressing the development of sheet cavitation to cloud cavitation. With the increase of jet intensity, the inhibition of reentrant jet and the suppression effect of cloud cavitation is more significant. The fluctuation amplitudes of lift and drag coefficients are reduced, thus weakening the periodic oscillation of force on the hydrofoil surface. Although the time-averaged lift and drag coefficient show a downward trend, the lift-drag ratio has a rising trend. The lift-drag ratio increases from 6.11 with non-injection to 7.06 at the jet-flow ratio of 0.3, and the layout of water injection hole has the effect of drag reduction.
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Received: 14 December 2015
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