轴流式喷水推进器泵级内部流场的数值计算

采用数值计算的方法,研究了轴流喷水推进器泵级模型的内部三维紊流流场和性能。计算针对泵级的进口到喷水推进器的出口进行,包括进水区域、叶轮、导流壳区域的泵级整个流道。采用结构网格对计算区域进行剖分,应用NUMECA软件对控制方程进行求解。选用Spalart-Allmaras一方程紊流模型,使用时间推进法计算流场中的流动参数。并根据流场计算结果对泵级的流量-扬程特性和流量-效率特性进行了预测。计算与实验结果对比表明,二者取得了较好的一致,说明采用的计算方法具有较好的可信性及较高的计算精度。根据流场计算结果,对泵级的性能进行了分析。

NUMERICAL SIMULATIONS OF 3D TURBULENT FLOWS IN AN AXIAL-FLOW WATER-JET PROPULSION

The performance of an axial-flow pump stage and its interior flow field are studied numerically. The calculated region is from the inlet of pump stage to the outlet of thruster, including impeller, stator and spout. The region is spitted by structure grid, and governing equations are solved by NUMECA software. The flow fields are calculated by the method of time-marching scheme. The performances of flow rate-head and flow rate-efficiency of pump stage are predicted according to the computation results. The prediction results are compared with experimental ones, and calculated results are preferably consistent with the experimental data. It shows that this calculation method has higher creditability and computational accuracy. Furthermore, the performance of the pump stage is analyzed based on the computational results.