摘要
采用欧拉-拉格朗日多相流模型对双吸式离心泵内的水流和泥沙颗粒运动进行了模拟,运用离散相冲击模型对叶片及轮毂的磨损情况进行了预测,分析了变速调节对离心泵泥沙磨损的影响。结果表明:设计工况下,叶轮磨损严重的位置主要集中在叶片头部以及轮毂面上靠近叶片吸力面的区域,叶片吸力面磨损强度大于压力面,数值模拟结果与现场观测结果相吻合;提高水泵转速后,叶轮流道中的相对流速分布变均匀,叶片和轮毂面的磨损明显改善,高强度磨损面积减小,磨损区域变分散。
In order to study the influence of variable speed regulation operation on sediment erosion in a centrifugal pump, water flow and sediment movement in a double-suction centrifugal pump was simulated using an Euler-Lagrange multiphase flow model, and the erosion rates were predicted with a particle erosion model in this paper. The erosion pattern of the blade and hub surfaces at different rotating speeds was analyzed. The results show that at design point, the blade inlet and hub surface close to the suction side are se- verely abraded, and the suction side of the blade is subject to more severe abrasion than the pressure side. The numerical results are in good agreement with the practical situation, A comparison of the erosion rates indicated that the sediment erosion of the impeller at higher rotating speed is effectively controlled. The impeller rotating at a higher speed makes the relative velocity distribute more u- niformly, which is conducive to reduce the erosion rates. The high erosion-rate area is reduced remarkably and the abrasion region becomes more dispersed on the blade and hub surface.
出处
《中国农村水利水电》
北大核心
2016年第8期201-204,208,共5页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51422906)
关键词
变速调节
泥沙磨损
离心泵
数值模拟
variable speed regulation
silt erosion
centrifugal pump
numerical simulation
