[1]周勇胜,袁连冲,陈斌,等.不同双进口对轴流泵不稳定工况性能改善研究[J].中国给水排水,2023,39(15):115-121.
　ZHOUYong-sheng,YUANLian-chong,CHENBin,et al.Effects of Different Double-inlet Structures on Performance Improvement of Axial?flow Pump under Unstable Working Conditions[J].China Water & Wastewater,2023,39(15):115-121.
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不同双进口对轴流泵不稳定工况性能改善研究

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第15期 页码: 115-121 栏目: 出版日期: 2023-08-01
Title:
Effects of Different Double-inlet Structures on Performance Improvement of Axial?flow Pump under Unstable Working Conditions
作者:
周勇胜1， 袁连冲2， 陈斌3， 张华3， 杨陈4
（1.合肥工业大学 机械工程学院，安徽 合肥 230009；2.南水北调东线江苏水源有限责任公司，江苏 南京 210017；3.南京合工智能环保研究院有限公司，江苏 南京 211500；4.蓝深集团股份有限公司，江苏 南京 211599）
Author(s):
ZHOU　Yong-sheng1， YUAN　Lian-chong2， CHEN　Bin3， ZHANG　Hua3， YANG　Chen4
（1. School of Mechanical Engineering， Hefei University of Technology， Hefei 230009， China； 2. The Eastern Route of South?to?North Water Diversion Project Jiangsu Water Source Co. Ltd.， Nanjing 210017， China； 3. Nanjing Hegong Intelligent Environmental Protection Research Institute Co. Ltd.， Nanjing 211500， China； 4. Lanshen Group Corp. Ltd.， Nanjing 211599， China）
关键词:
轴流泵;  双进口;  马鞍形;  叶顶泄漏;  小流量;  数值计算
Keywords:
axial-flow pump;  double?inlet;  saddle pattern;  tip leakage;  low flow rate;  numerical computation
摘要:
针对轴流泵在小流量时流量-扬程曲线表现出马鞍形的不稳定工况区问题，为轴流泵设计了一种叶轮进口边前方近轮缘处的双进口结构，包括喇叭形与圆筒形两种几何形状。此方法在泵的几何结构上表现为加装了内筒式分隔板，以加装的内筒与进水管内壁之间的间距值δ作为变量参数，分别研究了此参数大小和两种形状对轴流泵外特性曲线及内部流场的影响。结果表明，叶轮进口前双进口结构设计能够有效改善小流量时轴流泵叶轮进口边前端的流场分布，减少叶顶泄漏对主流的影响，提高不稳定区内的扬程，减小不稳定区内扬程曲线的正斜率，扩大了安全运行流量区间。3 个比选间距δ值中，δ = 10%D2内筒带来的扬程提升效果最好。喇叭形双进口比圆筒形双进口在设计流量以下区间的扬程提升值高，但两种形状的扬程差别在3%以内，工程中可选用圆筒形结构。
Abstract:
This paper designed a double?inlet structure installed in front of the impeller leading edge for axial-flow pump which included two geometric shapes: horn and cylinder, so as to solve the problem that the flow-head curve of axial?flow pump shows saddle pattern at low flow rate. For geometric structure of the pump, this method was represented by installing an inner cylinder separator. The distance δ between the installed inner cylinder and the inner wall of the inlet pipe was selected as a variable parameter. The influences of the size and shape of the inlet structure on the flow?head characteristic curve and internal flow field of the axial?flow pump were investigated, respectively. The double?inlet structure design in front of the impeller inlet effectively improved the flow field distribution at the front end of the inlet edge of the axial?flow pump at low flow rate, reduced the impact of tip leakage on the main stream, increased the head in the unstable flow area, reduced the positive slope of the flow-head curve in the unstable flow area, and expanded the safe flow range. Among the three δ values, the inner cylinder with δ equals to 10% of D2 had the best lift performance. The head increased by the horn type double?inlet was higher than that by the cylindrical type double?inlet in the section below the design flow. However, the lift difference of the two shapes was less than 3%, and the cylindrical structure was recommended to be selected in the project.
更新日期/Last Update: 2023-08-01