排灌机械工程学报2024，Vol.42Issue(4)：358-364,7.DOI:10.3969/j.issn.1674-8530.22.0218
自循环机匣提高轴流泵稳定性的参数化研究
Parametric study on improving stability of axial-flow pumps with self-circulating casing
摘要
Abstract
In order to explore ways to effectively expand the stable operating range of axial-flow pumps,a single-channel steady numerical simulation of the self-circulating casing treatment was carried out on an axial-flow pump to analyze the influence of the circumferential coverage ratio,suction port position and throat height on the expansion and stability performance of water pumps,and to as well reveal the influence law and improvement mechanism of the self-circulating casing on the expansion and stability of axial-flow pumps.The results show that the self-circulating casing can effec-tively expand the flow range of the axial-flow pump,keeping the position of the suction port un-changed,increasing the circumferential coverage ratio and throat height can increase the flow margin,but the design point efficiency is reduced.The flow margin of the self-circulating casing with a throat height of 1.8 mm first increases and then decreases with the backward movement of the suction port po-sition,and the efficiency first decreases and then increases,indicating that there is an optimal position above the blade tip.Within the scope of the study,the flow margin reaches a maximum of 5.93%,and the efficiency at the design point is reduced by a minimum of 1.12%.Through the self-circulating ca-sing treatment,the area of the blockage area formed by the interaction between the blade tip leakage flow and the main flow above the blade tip is reduced,which is responsible for the extended flow range and increased efficiency of the axial-flow pump for small flow conditions.This study provides a reference for the expansion and stability of axial-flow pump under the end wall treatment of self-circulating casing.关键词
轴流泵/自循环机匣处理/流量裕度/设计点效率/叶顶泄漏流Key words
axial-flow pump/self-circulating casing treatment/flow margin/design point efficiency/tip leakage flow分类
农业科技引用本文复制引用
童志庭,原野,张志民,张超..自循环机匣提高轴流泵稳定性的参数化研究[J].排灌机械工程学报,2024,42(4):358-364,7.基金项目
国家自然科学基金资助项目(51976139) （51976139）
