Abstract:The unsteady cavitating flow around NACA0015 oscillating hydrofoil is simulated by using FBM turbulence model and Zwart cavitation model. The development process of cavitation around the hydrofoil under different vibration conditions and different cavitation numbers is analyzed. The hydrodynamic characteristics and flow field structure during the vibration process are analyzed. The results show that the development of sheet cavitation is mainly affected by leading edge vortices. Due to the existence of leading edge vortices, there is a reverse jet near the hydrofoil wall at the trailing edge of the cavity and under the action of reverse jet, the shape and size of the sheet cavity will have a certain fluctuation range. Under the interaction of leading edge vortices and trailing edge vortices, the reverse jet continuously moves along the hydrofoil surface to the leading edge, and finally causes the attached cavity to shear and break into two parts. The development of the main part of the cavity still attached to the hydrofoil surface slowed down due to the action of the reverse jet. Due to the separation and shedding of leading edge vortices and large-scale cavities, the hydrodynamic curves of oscillating hydrofoil fluctuate, which is the main factor affecting the hydrodynamic characteristics of hydrofoil.
Key words: oscillating hydrofoil; unsteady cavitating flow; hydrodynamic characteristics
于安,王逸夫,雷婷婷. 绕振动水翼空化发展及水动力学特性研究[J]. 振动与冲击, 2022, 41(13): 265-274.
YU An, WANG Yifu, LEI Tingting. Cavitation development and hydrodynamic characteristics around oscillating hydrofoil. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(13): 265-274.
[1] Arakeri V H, Acosta A J. Viscous effects in the inception of cavitation on axisymmetric bodies[J]. Journal of Fluids Engineering, 1973, 95(4):519-527.
[2] Laberteaux K R , Ceccio S L , Mastrocola V J , et al. High speed digital imaging of cavitating vortices[J]. Experiments in Fluids, 1998, 24(5-6):489-498.
[3] Launder, B. E., and Spalding, D. B., The Numerical Computation of Turbulent Flows[J]. Computational Methods in Applied Mechanics and Engineering, 1974, 3(2):269-289.
[4] 袁建平, 侯敬生, 付燕霞,等. 离心泵回流漩涡空化的非定常特性研究[J]. 振动与冲击, 2018(16):24-30.
Yuan J , Hou J , Fu Y , et al. A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump[J]. Zhendong yu Chongji/Journal of Vibration and Shock, 2018, 37(16):24-30.
[5] T. H. Shih, W. W. Liou, A. Shabbir, et al. A new k-ε eddy viscosity model for high Reynolds number turbulent flows: Model development and validation[J]. Computers & Fluids, 1995, 24(3):227-238.
[6] Johansen S T, Wu J, Shyy W. Filter-based unsteady RANS computations[J]. International Journal of Heat and Fluid Flow, 2004, 25(1):10-21.
[7] 石磊, 张德胜, 陈健,等. 基于密度修正的滤波器模型在轴流泵叶顶区空化数值模拟中的应用与验证[J]. 振动与冲击, 2016(14期):41-46.
Shi L , Zhang D S , Chen J , et al. Application and verification of density correction method based filter based method for numerical simulation of cavitation in tip region of axial-flow pump[J]. Journal of Vibration & Shock, 2016.
[8] 杜佩佩,肖昌润,张露,等.基于RANS方法超空泡流数值计算方法研究[J].兵器装备工程学报, 2016,37(10):174-180.
Pei-Pei D U , Xiao C R , Zhang L , et al. Supercavitation Research on Numerical Simulation Method Based on Two-Equation RANS Model[J]. Journal of Ordnance Equipment Engineering, 2016.
[9] 黄彪,吴钦,王国玉.非定常空化流动研究现状与进展[J].排灌机械工程学报,2018,36(01):1-14.
Huang B , Qin W U , Wang G . Progress and prospects of investigation into unsteady cavitating flows[J]. Journal of Drainage and Irrigation Machinery Engineering, 2018.
[10] Kubota, A., Kato, H., Yamaguchi, H., A new modeling of cavitating flows: a numerical study of unsteady cavitation on a hydrofoil section[J]. Journal of Fluid Mechanics, 1992, 240 (1):59-96.
[11] Singhal, A.K., Li, H., Athavale, M.M., et al., Mathematical Basis and Validation of the Full Cavitation Model[J]. Journal of Fluids Engineering, 2002, 124(3):617-625.
[12] Kunz, R., Boger, D., Stinebring, D., et al., A preconditioned Navier--Stokes method for two-phase flows with application to cavitation prediction[J]. Computers & Fluids, Elsevier, 2000, 29(8):849-875.
[13] 王勇,陈杰,罗凯凯,等.基于改进Kunz模型的船用离心泵空化特性[J].排灌机械工程学报,2017,35(05):381-386.
Wang Y, Chen J, Luo K, et al. Analysis of cavitation characteristics of marine centrifugal pump based on modified Kunz model[J]. Journal of Drainage & Irrigation Machinery Engineering, 2017, 35(5):381-386.
[14] McCroskey, W. J., Unsteady airfoils[J]. Annual Review of Fluid Mechanics, 1982, 14:285-311.
[15] Ducoin A, Astolfi J A, Deniset F, et al., Computational and experimental investigation of flow over a transient pitching hydrofoil[J]. European Journal of Mechanics/B Fluids, 2009, 28(6):728-743.
[16] Yu A, Tang Q , D Zhou. Cavitation Evolution around a NACA0015 Hydrofoil with Different Cavitation Models Based on Level Set Method[J]. Applied Sciences, 2019, 9(4).