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
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.
王巍, 羿琦, 林茵, 徐瑞铎, 王晓放. 水翼表面布置射流水孔抑制空化[J]. 排灌机械工程学报, 2016, 34(10): 865-870.
WANG Wei, YI Qi, LIN Yin, XU Ruiduo, WANG Xiaofang. Impact of hydrofoil surface water injection on cavitation suppression. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(10): 865-870.
[1]关醒凡. 现代泵理论与设计[M]. 北京:中国宇航出版社,2011.[2]KRAVTSOVA A Y, MARKOVICH D M, PERVUNIN K S,et al. High-speed imaging of cavitation regimes on a round-leading-edge flat plate and NACA0015 hydrofoil[J]. Journal of visualization,2013,16(3):181-184.[3]LI D Q, GREKULA M, LINDELL P, et al. Towards numerical prediction of unsteady sheet cavitation on hydrofoils[J]. Journal of hydrodynamics, 2010, 22(S1):741-746.[4]KUIPER G. New developments and propeller design[J]. Journal of hydrodynamics,2010,22(9):7-16.[5]KAWANAMI Y, KATO H, YAMAGUCHI H, et al. Mechanism and control of cloud cavitation[J]. Journal of fluids engineering, 1997,119(4):788-794.[6]顾巍,何友声. 空泡流非稳态现象的流动控制[J]. 力学学报,2001,33(1):19-27. GU Wei, HE Yousheng. Flow control on unstable cavitation phenomena[J]. Chinese journal of theoretical and applied mechanics,2001,33(1):19-27.(in Chinese)[7]赵伟国. 水翼云空化及其控制机理研究[D]. 杭州:浙江大学,2012.[8]邬伟,熊鹰,齐万江. 基于翼剖面改型的空化抑制[J]. 中国舰船研究,2012,7(3):36-40,45. WU Wei, XIONG Ying,QI Wanjiang. Cavitation control of a 2-D hydrofoil under section reshaping[J]. Chinese journal of ship research,2012,7(3):36-40,45.(in Chinese)[9]邬伟,熊鹰. 一种抗空化翼型修形设计方法[J]. 上海交通大学学报,2013,47(6):877-883. WU Wei, XIONG Ying. A Reshaping method for anti-cavitating hydrofoil design[J]. Journal of Shanghai Jiao Tong University,2013,47(6):877-883.(in Chinese)[10]戴月进,张媛媛,黄典贵. 水翼表面粗糙带对空化抑制效果的数值研究[J]. 工程热物理学报,2012,33(5): 770-773. DAI Yuejin, ZHANG Yuanyuan, HUANG Diangui. Numerical study of the impact of hydrofoil surface roughness on cavitation suppression[J]. Journal of enginee-ring thermophysics,2012,33(5):770-773.(in Chinese)[11]张睿. 轴流泵失速和空化流动特性及其性能改善研究[D]. 上海大学,2014.[12]ARNDT R E A, ELLIS C R, PAUL S. Preliminary investigation of the use of air injection to mitigate cavita-tion erosion[J]. Journal of fluids engineering,1995,117(3):498-504.[13]SINGHAL A K, ATHAVALE M M,LI H, et al. Mathematical basis and validation of the full cavitation model[J]. Journal of fluids engineering,2002,124(3):617-624.[14]ASNAGHI A,JAHANBAKHSH E,SEIF M S. Unsteady multiphase modeling of cavitation around NACA0015[J]. Journal of marineence & technology Taiwan,2010,18(5):689-696.
