评价不同湍流模型在轴流泵性能预测中的应用.分别采用标准k-ε模型、RNGk-ε模型、SST模型以及基于滤波器的湍流模型(FBM)数值模拟了比转速为600的轴流泵内部流动;计算了其扬程、扭矩、效率,并与实验值进行对比;分析了4种模型计算的轴流泵流场中的压力、速度分布.结果表明,在最优工况附近,4种湍流模型都能较精确地预测轴流泵的外特性;在非设计工况下,标准k-ε模型、RNGk-ε模型、SST模型预测的外特性与实验值相差较大,FBM模型则可以大幅度提高非设计工况的预测精度.
To evaluate predictive capability of a turbulence model for performances of an axial-flow pump, the standard K-ε model, RNG k-ε model, SST model and filter-based model(FBM) are used to simulate the flows in an axial-flow pump respectively. Based on computations, the head, torque and efficiency of the axial-flow pump are predicted. To help shed light on the justification of these models, the numerical results are compared with experimental results. Distributions of pressure and velocity within the axial-flow pump are analyzed. Although all four models give satisfactory predictions in the optimal operating condition, a good agreement between numerical predictions and experimental date at off-design conditions is only obtained by using FBM model.