基于reynolds -average Navier-Stokes模拟和气泡动力学模型的叶片尖涡空化噪声数值研究

Ga-ram Ku, C. Cheong, Hanshin Seol
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引用次数: 1

摘要

本文提出了欧拉/拉格朗日单向耦合方法来预测叶尖涡空化(BTVC)引起的流动噪声。该方法由四个步骤组成:利用计算流体动力学技术进行流场模拟,利用涡模型重建翼尖涡,利用气泡动力学模型生成BTVC,利用声学类比进行声波预测。由于CFD方案固有的数值阻尼和湍流强度过大,导致翼尖涡结构的CFD预测在沿蒸汽方向上存在严重的强度低估问题,因此利用涡模型再生了沿自由流方向的翼尖涡。然后,采用基于Rayleigh-Plesset方程的气泡动力学模型,模拟了BTVC的产生和变化。最后,将每个球形气泡建模为单个源,其强度与气泡体积的时变速率成正比,从而预测了由BTVC引起的流动噪声。通过将预测结果与实测数据进行比较,验证了所提数值方法的有效性。
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Numerical investigation of blade tip vortex cavitation noise using Reynolds-averaged Navier-Stokes simulation and bubble dynamics model
In this study, the Eulerian/Lagrangian one-way coupling method is proposed to predict flow noise due to Blade-Tip Vortex Cavitation (BTVC). The proposed method consists of four sequential steps: flow field simulation using Computational Fluid Dynamics (CFD) techniques, reconstruction of wing-tip vortex using vortex model, generation of BTVC using bubble dynamics model and acoustic wave prediction using the acoustic analogy. Because the CFD prediction of tip vortex structure generally suffers from severe under-prediction of its strength along the steamwise direction due to the intrinsic numerical damping of CFD schemes and excessive turbulence intensity, the wing-tip vortex along the freestream direction is regenerated by using the vortex modeling. Then, the bubble dynamics model based on the Rayleigh-Plesset equation was employed to simulate the generation and variation of BTVC. Finally, the flow noise due to BTVC is predicted by modeling each of spherical bubbles as a monople source whose strength is proportional to the rate of time-variation of bubble volume. The validity of the proposed numerical methods is confirmed by comparing the predicted results with the measured data.
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CiteScore
0.60
自引率
50.00%
发文量
1
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