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通过求解雷诺平均N-S方程,采用NND格式和SST两方程湍流模型,对开/闭式凹坑二维和三维流动情况进行了模拟,得到了凹坑局部压力和热流的分布,并与试验结果进行了比较。计算结果表明,凹坑局部峰值压力和热流均出现在后沿附近,且闭式凹坑局部热流较开式凹坑更为严重;在三维流动情况下,由于侧壁的影响,开式凹坑峰值热流沿后沿展向变化较小,而闭式凹坑峰值热流会离开后沿中心而出现在后沿靠近侧壁的区域。
By solving the Reynolds-averaged Navier-Stokes equations and the NND and SST turbulence models, the two-dimensional and three-dimensional flow of the open / close pits are simulated and the distribution of local pressure and heat flow in the pits is obtained and compared with the experimental results A The calculated results show that the local peak pressure and heat flow in the dimple appear near the trailing edge, and the localized heat flow in the closed dimple is more serious than the open dimple. In the case of three-dimensional flow, due to the influence of the sidewall, the open dimple The peak heat flow changes less along the trailing edge, whereas the closed pocket peak heat flow leaves the trailing edge center and appears in the area of the trailing edge near the sidewall.