渣浆泵叶轮轴向间隙流动及泵体动态磨损特性研究

Investigation on the Impeller Axial Clearance Flow and Pump Casing Dynamic Wear Characteristics for Slurry Pump

为研究渣浆泵开式叶轮轴向间隙流动结构及泵体动态磨损特性,采用RNGκ-ε湍流模型和离散相模型,对开式叶轮渣浆泵内非定常固液两相流动进行数值模拟,分析了叶轮轴向间隙泄漏流及其与主流的相互干扰作用;建立了渣浆泵泵体动态磨损模型,由UDF函数实现对泵体壁面磨损过程的动态模拟,运用动网格技术实现间隙网格运动区域的动态更新,分析了泵体的动态磨损特性及泵体表面粗糙度对其磨损特性的影响;通过引入时间系数法来实现对实际时间周期内的磨损量预测,根据该模型的实际运行周期内的磨损量对不同时间系数的预测模型进行非线性修正,建立了基于时间系数法的磨损预测模型,算例计算结果验证了预测模型的可靠性,该研究为渣浆泵泵体的磨损寿命的预测提供了一个可行的方案。

In order to study the impeller axial clearance flow structure and dynamic wear characteristics of open impeller slurry pump casing.Unsteady solid-liquid two-phase flow in an open impeller slurry pump was simulated numerically using RNGκ-εturbulence model and discrete phase model.The axial clearance leakage flow and its interaction with the main flow were analyzed.The dynamic wear model of slurry pump casing is established.The user defined function was used to simulate the wear process of the pump casing,and the dynamic mesh technique was used to dynamic update the clearance mesh.The dynamic wear characteristics of the pump casing and the influence of roughness on the wear characteristics of the pump casing surface were analyzed.The time coefficient method was introduced to predict the wear in the actual time period.The models with different time coefficients were nonlinearly modified according to the actual wear amount during the operation period of the model.The wear prediction model based on time coefficient method was established.The results of an example verify the reliability of the prediction model.This study provides a feasible scheme for predicting the wear life of slurry pump.