Abstract
With the use of RNG k-ε turbulence model, SIMPLEC algorithm and CFD software, the turbulent flow in an axial flow impeller was numerically simulated in the clear water (single-phase) and the sandy water (solid-liquid two-phase) conditions. The distributions of solid concentration, velocity and pressure on the impeller of an axial flow pump were analyzed at the same particle diameter but different volume concentrations in sandy water. And these distributions were comparatively analyzed under the clear water and the sandy water conditions. According to the simulation results, the axial pump impeller will be damaged more easily and quickly in sandy water than in clear water. And the area more prone to damage on the axial flow impeller is predicated. The predicted vulnerable parts in an axial flow impeller are consistent with that in actual projects. This study shows that the numerical simulation results are the same as the actual situation, and it has guiding significance for the wear design of the axial flow pump.DOI: http://dx.doi.org/10.5755/j01.mech.24.3.13854
Highlights
Axial flow pump is a low head and high flow pump, whose simple structure is available for urban water supply, agricultural irrigation and water diversion projects [1-2]
The designs of the axial flow pump impeller are mostly based on the premise of clean water medium, which leads to the serious damage of the impeller in the actual operation, reduces the operating efficiency of pumps and increases their energy consumption
The turbulent flow in an axial flow impeller was numerically simulated in the clear water and the sandy water conditions
Summary
Axial flow pump is a low head and high flow pump, whose simple structure is available for urban water supply, agricultural irrigation and water diversion projects [1-2]. The designs of the axial flow pump impeller are mostly based on the premise of clean water medium, which leads to the serious damage of the impeller in the actual operation, reduces the operating efficiency of pumps and increases their energy consumption. This issue has attracted great attention from scholars, and has been studied theoretically and experimentally. The flow characteristics of solid-liquid two-phase flow were studied, and the results were compared with those in clear water
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