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建立了基于微可压缩流体理论的相对运动的大涡模拟方法,并对混流式转轮流场进行了三维非恒定粘性数值模拟,计算方法采用了有限体积法和预测-校正方法,对固体边壁的处理使用了“壁函数”法。得到了混流式转轮的三维速度场和压力分布,与k ε模型计算结果进行比较表明,所建立的相对运动的大涡模拟方法对转轮性能预测更加精确、合理,对转轮改型设计具有十分重要的参考价值。
A large eddy simulation method of relative motion based on the theory of micro-compressible fluid was established, and the three-dimensional non-constant viscous numerical simulation of flow field was carried out. The finite volume method and prediction-correction method were used in the calculation. Wall processing uses the “wall function” method. The 3D velocity field and pressure distribution of Francis runner are obtained. Comparing with the results of k ε model, it is shown that the established large eddy simulation method of relative motion can predict the runner performance more accurately and reasonably. Has a very important reference value.