Experimental and numerical investigation of unsteady cavitating flows through a 2D hydrofoil
Experimental and numerical investigation of unsteady cavitating flows through a 2D hydrofoil
复制标题
二维水翼非定常空化流的实验和数值研究
DOI：
10.1007/s11431-011-4369-1
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发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
Wang GuoYu
中科院分区：
文献类型：
--
作者：
Huang Biao;Wang GuoYu
本研究首先基于流动可视化和详细速度测量研究了水翼周围的非定常空化流，利用高速摄像机对流动结构进行可视化，并应用粒子图像测速（PIV）技术测量时均和瞬时速度场和涡度场。结果表明，水蒸气与两相区之间的传质过程存在很大的不稳定性，空化整体呈现自激振荡行为，具有较大的长度波动和蒸气云脱落，且空化结构依赖于水汽混合物和周期性涡旋脱落的相互作用。本实验研究的主要目的是为验证计算模型提供信息，并阐明空化流的非稳态多相传输过程。此外，重点关注附加湍流空化流的动力学，从k-ɛ二方程模型推导出基于滤波器的模型（FBM），并将旨在改进非定常模拟的条件平均方法应用于计算。总体而言，与标准 k-ɛ 模型相比，基于滤波器的模型显着提高了预测能力。
In the present study, firstly, the unsteady cavitating flows around a hydrofoil are studied based on the flow visualization and detail velocity measurement, a high-speed video camera is used to visualize the flow structures, and a particle image velocimetry (PIV) technique is applied to the measurement of the time-averaged and instantaneous velocity and vorticity fields. The results show that the unsteadiness of mass transfer process between the vapor and the two-phase regions is substantial, a self-oscillatory behavior of the whole sheet cavitation is obtained, with large length fluctuations and vapor cloud shedding, and also the cavitation structure depends on the interaction of the water-vapor mixture and the periodic vortex shedding. The main purpose of this experimental study is to offer information for validating computational models, and shed light on the unsteady multiphase transport process of cavitating flows. Furthermore, with an emphasis on the dynamics of the attached turbulent cavitating flows, a filter-based model (FBM) is derived from thek-ɛtwo-equation model, a conditional averaging method aimed at improving unsteady simulation is applied to computation. In comparison to the standardk-ɛmodel, overall, the filter-based model is shown to improve the predictive capability considerably.
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影响因子：
2
作者：
H. Fasel;J. Seidel;S. Wernz
通讯作者：
H. Fasel;J. Seidel;S. Wernz
影响因子：
2.4
作者：
Foeth, EJ;van Doorne, CWH;Wieneke, B
通讯作者：
Wieneke, B
影响因子：
2.8
作者：
R. Kunz;D. Boger;D. R. Stinebring;T. Chyczewski;J. Lindau;H. Gibeling;S. Venkateswaran;T. Govindan-T.-Govin
通讯作者：
R. Kunz;D. Boger;D. R. Stinebring;T. Chyczewski;J. Lindau;H. Gibeling;S. Venkateswaran;T. Govindan-T.-Govin
DOI：
10.1007/978-3-662-08797-8_16
发表时间：
2004
期刊：
--
影响因子：
--
作者：
A. Ruprecht;Thomas Helmrich;Iva Buntić
通讯作者：
A. Ruprecht;Thomas Helmrich;Iva Buntić
DOI：
--
发表时间：
1974
期刊：
--
影响因子：
--
作者：
B. Launder;D. Spalding
通讯作者：
B. Launder;D. Spalding