后掠式叶片轴流泵固液两相流数值模拟与优化

针对轴流叶轮在污水固液两相流介质中的磨损问题,该文设计了不同后掠式叶轮结构方案进行优化设计,分别对后掠角度为40°、65°、90°的后掠叶片和原型叶片进行固液两相流数值模拟和试验对比,并分析了不同后掠方案叶轮内固体颗粒的分布特性。数值模拟结果表明,随着后掠角度的增加,叶片压力面固相体积分数会逐渐减少,而叶片吸力面上固相体积分数会先增加后减小,叶轮内固相的径向流动越明显并且叶片后掠角度越大,固相就越难与叶片压力面接触,而越易与叶片吸力面接触;颗粒直径越大,后掠叶片压力面上固相体积分数越大,而叶片吸力面进口边靠近轮毂处的固相体积分数增加;颗粒浓度越大,后掠叶片压力面上固相体积分数减少,叶片吸力面上...

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Bibliographic Details
Published in农业工程学报 Vol. 30; no. 11; pp. 76 - 82
Main Author 施卫东 邢津 张德胜 陈刻强 程成
Format Journal Article
LanguageChinese
Published 江苏大学流体机械工程技术研究中心,镇江,212013 2014
Subjects
优化
后掠叶片
固液两相流
数值方法
泵
numerical methods
solid-liquid two-phase turbulent flow
back swept blade
泵
后掠叶片
optimization
优化
pumps
固液两相流
数值方法
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Summary:针对轴流叶轮在污水固液两相流介质中的磨损问题,该文设计了不同后掠式叶轮结构方案进行优化设计,分别对后掠角度为40°、65°、90°的后掠叶片和原型叶片进行固液两相流数值模拟和试验对比,并分析了不同后掠方案叶轮内固体颗粒的分布特性。数值模拟结果表明,随着后掠角度的增加,叶片压力面固相体积分数会逐渐减少,而叶片吸力面上固相体积分数会先增加后减小,叶轮内固相的径向流动越明显并且叶片后掠角度越大,固相就越难与叶片压力面接触,而越易与叶片吸力面接触;颗粒直径越大,后掠叶片压力面上固相体积分数越大,而叶片吸力面进口边靠近轮毂处的固相体积分数增加;颗粒浓度越大,后掠叶片压力面上固相体积分数减少,叶片吸力面上固相体积分数增加。当优化后的后掠叶片角为90°时,该叶片结构优化了固体颗粒的分布,可大幅降低叶片轮缘处的磨损,提高了轴流叶轮在污水介质中的使用寿命和运行可靠性。
Bibliography:11-2047/S
By changing the inlet edge blade shape of the plane to get different degrees of the back swept blade, simulating the back swept degree of 40°, 65°and 90° of axial flow pump blades and original prototype blades pump of the three-dimensional solid-liquid two-phase flow channel to get the characteristic curves and distributions of solid particles within the impeller. Characteristic curves show that the back swept angle will reduce the efficiency and head of the pump, which means the reduction grows with the growth angle. With the increase of the particle diameter, the particle moves backward to the pressure surface, therefore the solid phase volume fraction increases, meanwhile the solid phase volume fraction at the suction surface near the hub of the inlet side also increases; with the increase of particle volume fraction, the solid phase volume fraction at the pressure surface reduces and the solid phase volume fraction at the suction surface of the blade increases. It is predictable that the solid ph
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.11.010