Question

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以CFD技术为基础,对比转速84.5的单级单吸离心泵正反转运行时内部流动进行了三维定常全流场数值模拟, 计算采用雷诺时均方程和标准k-ɛ湍流模型, 压力和速度耦合采用SIMPLEC算法，研究了离心泵双向运行在同一转速，不同流量情况下，轴向力的特性分析，分析了离心泵在泵工况和透平工况下，盖板、叶片、内表面所产生的轴向力的变化情况，并说明了其产生的原因，进一步研究了泵工况及透平工况下总轴向力的变化趋势。模拟结果表明：随着流量的增大，泵工况下总轴向力逐渐减小，与经验公式变化趋势相吻合，透平工况下总轴向力逐渐增大，其原因还有待进一步研究。在各自的最优工况附近，透平工况的总轴向力是泵工况总轴向力的1.2倍左右。

Answer 1

With CFD technology as the foundation, contrast speed 84.5 single-stage single-suction centrifugal pump and transport the internal flow, the three-dimensional unsteady full flow field numerical simulation calculation, the Reynolds time-averaged equation and standard k - ɛ turbulence model, the pressure and velocity coupling the SIMPLEC algorithm, the centrifugal pump two-way operation at the same speed, different flow conditions, axial force characteristic analysis, analysis of the centrifugal pump in the pump working condition and turbine condition, cover, leaf, inner surface produced by the axial force changes, and illustrates the reasons, and further study the pump working condition and turbine conditions total axial force change trend. The simulation results show that with the increase of flow, pump under the condition of total axial force decrease gradually, and the empirical formula change trend match, turbine conditions total axial force increase gradually, its reason still needs further research. In their respective optimal condition near, turbine condition of total axial force is pump working condition the total axial force of 1.2 times the left and right sides.

Answer 2

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