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偏工况下壁面粗糙度对泵腔内流动规律的影响

Keywords: 壁面粗糙度,泵腔,圆盘摩擦损失,泄漏

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Abstract:

本文将结合雷诺时均方程、RNGk-varepsilon湍流模型和等效沙粒粗糙度模型,研究一离心泵泵腔内的流动规律与壁面粗糙度和运行工况的关系。研究表明:壁面粗糙度对离心泵外特性的影响存在一个峰值,此时绝对粗糙度的值为0.2mm;随着流量的增加,壁面粗糙度对叶轮前、后盖板所受扭矩的影响增加、对离心泵轴功率的影响减小。设计工况下,前泵腔中存在无量纲切向速度alpha值不变的核心流动区域。在核心流动区域内,随着粗糙度的增加,alpha值先减小,达到极小值后趋于稳定,稳定值为0.51。在前盖板附近,极小值往粗糙度较大的方向移动。小流量工况下,湍流核心区域消失,动、静壁面附近alpha值随流量的变化规律相反。大流量工况下,湍流核心区域减小,且更加靠近静壁面。

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