非定常空化流动涡旋运动及其流体动力特性

赵宇; 王国玉; 黄彪; 胡常莉; 陈广豪; 吴钦

doi:10.6052/0459-1879-13-177

非定常空化流动涡旋运动及其流体动力特性

doi: 10.6052/0459-1879-13-177

北京理工大学机械与车辆学院, 北京 100081

基金项目: 国家自然科学基金资助项目（51239005，9876543）.

详细信息

作者简介:
王国玉，教授，主要研究方向：水动力学.E-mail：wangguoyu@bit.edu.cn

中图分类号: O357.5
计量
- 文章访问数: 1377
- HTML全文浏览量: 58
- PDF下载量: 2141
- 被引次数: 0
出版历程
- 收稿日期: 2013-06-13
- 修回日期: 2013-07-17
- 刊出日期: 2014-03-18

STUDY OF TURBULENT VORTEX AND HYDRAULIC DYNAMICS IN TRANSIENT SHEET/CLOUD CAVITATING FLOWS

Beijing Institute of Technology, School of Mechanical Engineering, Beijing 100081, China

Funds: The project was supported by the National Natural Science Foundation of China (51239005, 9876543).

摘要

摘要: 采用大涡模拟方法对绕水翼云状空化的水动力特性和非定常流场结构进行研究. 基于实验结果对数值方法进行验证，分析空化与流场内部涡旋结构之间的相互作用以及对水翼动力特性的影响. 研究结果表明：大涡模拟方法可以准确模拟绕水翼流动的非定常过程. 在无空化条件下，升阻力系数存在斯特劳哈数St = 0.85 的主频波动，这是由水翼尾部涡旋结构的发展脱落引起的；在云状空化条件下，升阻力系数存在St = 0.34 的高能量密度低频波动，这是由大规模云状空泡团的发展和脱落引起的；云状空化阶段的升阻力系数在St = 0.5~1.5 的范围内都存在较高的波动，这是由于空化现象对水翼尾缘涡旋结构的发展和脱落产生影响，在不同发展阶段，空化现象不同程度地降低尾缘涡旋结构脱落频率.
- 空化 /
- 涡旋结构 /
- 动力特性 /
- 大涡模拟
Abstract: Studies are presented for a Clark-Y hydrofoil fixed at an attack angle of α=8° at a moderate Reynolds number, Re=7×10⁵, for both noncavitating and sheet/cloud cavitating conditions. The numerical simulations are performed via the commercial code CFX using a transport equation-based cavitation model, and the turbulence model utilizes the large eddy simulation (LES) approach with a classical eddy viscosity subgrid-scale turbulence model. The results show that numerical predictions are capable of capturing the initiation of the cavity, growth toward the trailing edge, and subsequent shedding, in accordance with the quantitative features observed in the experiment. The primary frequency, St =0.85, of the hydrodynamic fluctuations can be observed for noncavitation. It is induced by the shedding of the vortex structures at the trailing edge of the hydrofoil. The primary frequency, St =0.34, of the hydrodynamic fluctuations is induced by the growing up and shedding of the cavity, which can be observed for sheet/cloud cavitation. At the same time, some medium amplitude peaks are observed ranking from St =0.5 to St =1.5. These are due to the divergence influences from cavitation in different phases. These influences may lead to changes of vortex shedding frequencies at the trailing edge of the hydrofoil.
- cavitation /
- vortex structures /
- dynamic characteristic /
- large eddy simulation

HTML全文

参考文献(23)

刘筠乔, 鲁传敬, 李杰等. 导弹垂直发射出筒过程中通气空泡流研究. 水动力学研究与进展, 2007, 22(5): 549-554 (Liu Yunqiao, Lu Chuanjing, Li Jie, et al. An investigation of ventilated cavitating flow in vertical launching of a missile. Journal of Hydrodynamics (Ser.A), 2007, 22(5): 549-554 (in Chinese))

Cervone A, Bramanti C, Rapposelli E. Experimental characterization of cavitation instabilities in a two-bladed axial inducer. Journal of Propulsion and Power, 2006, 22 (6): 1389-1395

顾巍, 何友声, 胡天群. 轴对称体空泡流的噪声特性与空泡界面瞬态特征. 上海交通大学学报, 2000, 34(8): 1026-1030 (Gu Wei, He Yousheng, Hu Tianqun. Noise feature of cavitation flows on axisymmetric bodies and transient characteristics of cavity interface. Journal of Shanghai Jiaotong University, 2000, 34(8): 1026-1030 (in Chinese))

Li CY, Ceccio SL. Interaction of single travelling bubbles with the boundary layer and attached cavitation. Journal of Fluid Mechanics, 1996, 322: 329-353

童秉纲, 尹协远, 朱克勤. 涡运动理论. 安徽:中国科学技术大学出版社, 2008 (Tong Binggang, Yin Xieyuan, Zhu Keqin. Vortex Dynamic Theory, Anhui: Press of University of Science and Technology of China, 2008 (in Chinese))

Arakeri VH, Acosta AJ. Viscous effects in the inception of cavitation on axisymmetric bodies. Journal of Fluids Engineering, 1973, 95(4): 519-527

Belahadji B, Franc P, Michel M. Cavitation in the rotational structures of a turbulent wake. Journal of Fluid Mechanics, 1995, 287: 383-403

Arndt REA. Cavitation in vertical flows. Annual Review of Fluid Mechanics, 2002, 34: 143-175

Gopalan S, Katz J. Flow structure and modeling issues in the closure region of attached cavitation. Physics of Fluids, 2000, 12(4): 3414-3431

Wang GY, Senocak I, Shyy W. Dynamics of attached turbulent cavitating flows. Progress in Aerospace Sciences, 2001, 37: 551-581

张博, 王国玉, 黄彪等. 云状空化非定常脱落机理的数值与实验研究. 力学学报, 2009, 41(5): 651-659 (Zhang Bo, Wang Guoyu, Huang Biao, et al. Numerical and experimental studies on unsteady shedding mechanisms of cloud cavitation. Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(5): 651-659 (in Chinese))

Huang B, Wang GY. Experimental and numerical investigation of unsteady cavitating flows through a 2D hydrofoil. Science China Technological Science, 2011, 54(7): 1801-1812

黄彪. 非定常空化流动机理及数值计算模型研究.[博士论文]. 北京:北京理工大学, 2012 (Huang Biao. Physical and numerical investigation of unsteady cavitating flows.[PhD Thesis]. Beijing: Beijing Institute of Technology, 2012 (in Chinese))

Huang B, Young YL, Wang GY, et al. Combined experimental and computational investigation of unsteady structure of sheet/cloud cavitation. ASME Journal of Fluid Engineering, 2013, 135: 071301

Huang B, Wang GY, Zhao Y, et al. Physical and numerical investigation on transient cavitating flows. Science China Technological Science, 2013, 56(9): 2207-2218

Ji B, Luo XW, Wu YL, et al. Numerical analysis of unsteady cavitating turbulent flow and shedding horse-shoe vortex structure around a twisted hydrofoil. International Journal of Multiphase Flow, 2013, 51: 33-43

Wang G, Ostoja-Starzewski M. Large eddy simulation of a sheet/cloud cavitation on a NACA0015 hydrofoil. Mathematical Modeling, 2006, 31(3): 417-447

Luo XW, Ji B, Peng XX, et al. Numerical simulation of cavity shedding from a three-dimensional twisted hydrofoil and induced pressure fluctuation by large-eddy simulation. ASME Journal of Fluids Engineering, 2012, 134(4): 041202

Qin Q. Numerical modeling of natural and ventilated cavitating flows.[PhD Thesis]. Minneapolis: University of Minnesota, 2004

Ji B, Luo XW, Peng XX, et al. Three-demensional large eddy simulation and vorticity analysis of unsteady cavitating flow around a twisted hydrofoil. Journal of Hydrodynamics, 2013, 25(4): 510-519

Dittakavi N, Chunekar A, Frankel S. Large eddy simulation of turbulent-cavitation interactions in a Venturi nozzle. Journal of Fluids Engineering, 2010, 132(12): 121301

Smagorinsky J. General circulation experiments with the primitive equations. Month Weath, 1963, 93: 99-165

Kubota A, Kato H, Yamaguchi H. A new modeling of cavitating flows: A numerical study of unsteady cavitation on a hydrofoil section. Journal of Fluid Mechanics, 1992, 240(1): 59-96

施引文献

资源附件(0)

访问统计