Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points
Numerical analysis of the unsteady flow in the near-tongue region in a volute-type centrifugal pump for different operating points
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DOI：
10.1016/j.compfluid.2010.01.001
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发表时间：
2010-05-01
影响因子：
2.8
通讯作者：
Blanco, Eduardo
中科院分区：
文献类型：
--
作者：
Barrio, Raul;Parrondo, Jorge;Blanco, Eduardo
本文研究了比转速为0.47的单吸蜗壳式离心泵舌部附近的非定常流动特性。在本研究中，通过商业CFD软件（求解三维非定常流的Navier-Stokes方程（3D-URANS））模拟了通过实验室提供的试验泵的流量。对数值模型进行了敏感性分析，以确定适当的网格尺寸、时间步长和湍流模型参数。将数值模型的预测结果与实验结果进行了对比，实验结果包括整体（流量-水头曲线和蜗壳前侧的静压分布）和非定常变量（在叶片通过频率下过滤的蜗壳前侧的非定常压力分布）。一旦验证，该模型用于研究与叶轮叶片和蜗壳舌之间的相互作用相关的流量脉动，作为流量的函数，对于标称流量的20%至160%的几个流量。该研究允许将叶片通道与舌附近区域中多个参考位置处的压力脉动以及切向和径向速度关联起来。数值模型也被用来评估叶轮舌间隙之间的泄漏流和通过一些特定的角度间隔离开叶轮的流量的演变，在一个单叶片通道。(C)2010爱思唯尔有限公司版权所有。
An investigation is presented on the unsteady flow behaviour near the tongue region of a single-suction volute-type centrifugal pump with a specific speed of 0.47. For this study, the flow through the test pump, which was available at laboratory, was simulated by means of a commercial CFD software that solved the Navier-Stokes equations for three-dimensional unsteady flow (3D-URANS). A sensitivity analysis of the numerical model was performed in order to impose appropriate parameters regarding grid size, time step size and turbulence model. The predictions of the numerical model were contrasted with experimental results of both global (flow-head curve and static pressure distribution at volute front side) and unsteady variables (unsteady pressure distribution at the volute front side filtered at the blade-passing frequency). Once validated, the model was used to study the flow pulsations associated to the interaction between the impeller blades and the volute tongue as a function of the flow rate, for several flow rates ranging from 20% to 160% of the nominal flow rate. The study allowed relating the blade passage with the pulsations of pressure and tangential and radial velocity at a number of reference locations in the near-tongue region. The numerical model was also used to evaluate the evolution of the leakage flow between the impeller-tongue gap and of the flow exiting the impeller through some specific angular intervals, during one single-blade passage. (C) 2010 Elsevier Ltd. All rights reserved.