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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Effects of Different Double-inlet Structures on Performance Improvement of Axial?flow Pump under Unstable Working Conditions

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第15期 Page: 115-121 Column: Date of publication: 2023-08-01
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）
Keywords:
axial-flow pump;  double?inlet;  saddle pattern;  tip leakage;  low flow rate;  numerical computation
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.
Last Update: 2023-08-01