模拟翼型热敏介质空化流的湍流模型修正与应用

In order to study the influence of turbulence models on the numerical simulation accuracy of cavitating flow of thermosensitive media, combined with the filter-based model (FBM) and the density-corrected model (DCM), based on the local grid scale and the gas-liquid two-phase mixed density, the turbulent viscosities of three turbulence models (k - ε, RNG k - ε and SST k - ω) were corrected. And using the original turbulence models and the corrected turbulence models respectively, with water at different temperatures as the medium, the single-phase and gas-liquid two-phase numerical simulations of the NACA0015 airfoil were carried out. The accuracy of the numerical simulation results was verified by comparing with the experimental data. The research results show that the corrected k - ε model eliminates the influence of the turbulence scale, and the cavitation development law calculated by the corrected RNG k - ε model is consistent with the experimental results. The corrected RNG k - ε model reveals the laws of cavitation and temperature change, reflecting a good correction effect and can provide a theoretical reference for the numerical simulation of cavitating flow of low-temperature thermosensitive media.

为了研究湍流模型对热敏介质空化流数值模拟精度的影响,结合滤波器模型(Filter-based model,FBM)和密度修正模型(Density-corrected model,DCM),基于局部网格尺度和气液两相混合密度,修正了3种湍流模型(k-ε、RNG k-ε和SST k-ω)的湍流粘度,并分别采用原始湍流模型和修正湍流模型,以不同温度的水为介质,对NACA0015翼型进行了单相和气液两相数值模拟。通过与实验数据比较,验证了数值模拟结果的准确性。研究结果表明,修正的k-ε模型消除了湍流尺度的影响,通过修正的RNG k-ε模型计算得到的空泡发展规律与实验结果一致。修正后的RNG k-ε模型揭示了空化与温度变化的规律,反映出较好的修正效果,可为低温热敏介质空化流数值模拟提供理论参考。