压水室结构对离心泵径向力影响的数值分析  

Numerical analysis the influence of collector configurations on radial force for centrifugal pumps

作　　者：江伟[1] 李国君[1] 张新盛[1] 

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《排灌机械工程学报》2013年第2期93-97,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51076126)

摘　　要：采用SST k-ω湍流模型对不同压水室结构:单蜗壳、双蜗壳、导叶和蜗壳匹配同一叶轮的离心泵进行定常和非定常数值模拟.根据数值计算结果比较并分析3种不同结构压水室离心泵外特性、定常和非定常径向力特性.结果表明,在全流量下,单蜗壳和双蜗壳离心泵流量-扬程曲线变化平缓,效率高效区较宽;单蜗壳离心泵径向力远大于其他2种形式离心泵;导叶式离心泵径向力方向随着流量增加基本不变,其他2种形式离心泵径向力方向随着流量的增加变化较大且从隔舌向蜗壳出口移动;单蜗壳离心泵和双蜗壳离心泵径向力整体变化趋势呈椭圆分布,导叶式离心泵径向力变化无规律性;单蜗壳离心泵径向力平衡较差,瞬态径向力幅度波动远大于其他2种形式离心泵.分析结果可对离心泵径向力的认识和设计提供依据.Using SST k -ω turbulent model, both steady and unsteady numerical methods were applied to simulate centrifugal pumps with various collectors of single volute, double volute, and vaned diffuser with a volute, in which the same impeller was adopted. The overall characteristics, steady and un- sleady radial forces characteristics of the centrifl, gal pumps with three different collectors were com- pared and analyzed according lo tire simulated resuhs. The resuhs show that the c rves of capacity- head of both single volute and double volute centrifugal pump are flat and tire high efficiency areas are relatively wide. Radial force of the single volue centrifugal pump is much larger than that of the other two. As flow rate increases, radial toree direction of the vaned centrifugal pnmp changes slightly, while those of the other two change greatly and move from the tongue to the volute exit. The overall h＇end of radial forces of single volute and double volute centrifugal pumps is elliptic distrihution, and thai of the vaned centrifugal pump is irregular. Radial force halance of the single volute centrifugal pump is poor and transient amplitude fluctuations are much larger than the other two models. The re- search results can be beneficial reference for eognition and design of centrifugal pumps.

关 键 词：压水室 离心泵 定常与非定常 数值模拟 径向力 

分 类 号：TH311[机械工程—机械制造及自动化] S277.9[农业科学—农业水土工程]