排灌机械工程学报Issue(11)：948-954,7.DOI:10.3969/j.issn.1674-8530.13.6059
多工况高抗汽蚀性能的诱导轮设计
Design of inducer with excellent suction performance under multi-operating conditions
摘要
Abstract
Two inducers respectively with constant-and variable-pitch are designed to improve the suc-tion performance of a low specific speed centrifugal pump with a flow rate ratio of 30 (maximum flow rate over minimum one )based on a design principle that the head generated by an inducer should match the suction head of the main impeller of a pump.The cavitating flows in the centrifugal pumps with two inducers are simulated by using the SST turbulence model and the mixture cavitation model under a few working conditions,and the head breakdown characteristics and bubble distribution fea-tures are analyzed to disclose the mechanisms for the head breakdown caused from cavitation at various flow rates.The performance curves of the pumps with the two inducers are measured on a high-speed pump test rig.The predicted hydraulic and suction performance curves are compared with the measure-ments,and good agreement is achieved.It is confirmed that the design principle adopted here can be as an essential guidance on design of inducer with excellent suction performance.The head breakdown curves with decreasing inlet pressure are different from one flow rate to another.The slope of the head breakdown curve at a high flow rate is sharper than that at a low flow rate and the head declines slowly with reducing net positive suction head available.The shape of the curve at a middle flow rate is in rectangular shape.Compared with the constant-pitch inducer,the variable-pitch inducer is subject to an even smaller incidence angle and even high head,allowing a high-speed centrifugal pump to have a more wide range of flow rate for stable operation.关键词
离心泵/诱导轮/变螺距/等螺距/汽蚀Key words
centrifugal pump/inducer/variable-pitch/constant pitch/cavitation分类
农业科技引用本文复制引用
李永鹏,陈晖,王文廷,杜玉洁..多工况高抗汽蚀性能的诱导轮设计[J].排灌机械工程学报,2014,(11):948-954,7.基金项目
中国航天科技集团公司支撑项目 （）
