基于全空化模型，提出了修正RNGk-ε模型，并对NACA0015水翼的非定常空化流场进行了数值研究。基于标准RNGk-ε模型和修正的RNGk-ε模型，在8。和20。两种冲角及Re=3×10^5的条件下，针对不同空化数，分别预测了翼型周围的速度场、翼型表面的空穴形态以及非定常空化时空泡的演化过程。和试验结果对比，两个湍流模型都能较好地捕捉翼型周围的大空泡团，其中，标准的RNGk-ε模型能较好捕捉翼型头部的空穴，修正的RNGk-ε湍流模型能更好地模拟翼型表面的空穴形态、空泡脱落过程及其产生的回流。
Based on the full cavitation model, a modified RNG k-ε model is proposed to simulate the unsteady cavitating flow around NACA0015 airfoil. At attack angles of 8° and 20° with different cavitation numbers and Reynolds number of Re=3×10^5, the standard RNG k-ε and modified RNG k-ε are used to predict velocity vectors, vortex of cloud cavity as well as evolution process of time-dependent cavity shape respectively. Compared with experimental data, these two models can capture big bubbles around airfoil, while standard RNG k-ε model can more accurately capture the shape of cavity on the suction face of airfoil, and the modified RNG k-ε model can better simulate the coherent structure of cavity, the collapse of the big bubbles and the re-entrant flow.
参考文献
| [1] | Ashok K.Singhal;Mahesh M.Athavale;Huiying Li;Yu Jiang .Mathematical basis and validation of the full cavitation model[J].Journal of Fluids Engineering: Transactions of the ASME,2002(3):617-624. |
| [2] | Senocak I.;Shyy W. .A pressure-based method for turbulent cavitating flow computations[J].Journal of Computational Physics,2002(2):363-383. |
| [3] | 黄彪,王国玉,张博,余志毅.云状空化流动数值模拟的空化模型评价[J].北京理工大学学报,2009(09):785-789. |
| [4] | Vedanth Srinivasan;Abraham J. Salazar;Kozo Saito .Numerical simulation of cavitation dynamics using a cavitation-induced-momentum-defect (CIMD) correction approach[J].Applied mathematical modelling,2009(3):1529-1559. |
| [5] | G. Wang;M. Ostoja-Starzewski .Large eddy simulation of a sheet/cloud cavitation on a NACA0015 hydrofoil[J].Applied mathematical modelling,2007(3):417-447. |
| [6] | 季斌,罗先武,彭晓星,吴玉林,许洪元.绕扭曲翼型三维非定常空泡脱落结构的数值分析[J].水动力学研究与进展A辑,2010(02):217-223. |
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