3D Start-up Transition Process of Full Flow System for Shaft-extention Tubular Pump Station

被引：0
|
作者：
Xu H. [1 ]
Gong Y. [1 ]
Cao C. [2 ]
Chen H. [1 ]
Kan K. [3 ]
Feng J. [1 ]
机构：
[1] College of Agricultural Science and Engineering, Hohai University, Nanjing
[2] Power China Huadong Engineering Co., Ltd., Hangzhou
[3] College of Energy and Electrical Engineering, Hohai University, Nanjing
来源：
Kan, Kan (kankan@hhu.edu.cn) | 1600年 / Chinese Society of Agricultural Machinery卷 / 52期
关键词：
Additional slap doors; Shaft-extension tubular pump; Start-up process; Three-dimensional numerical simulation;
D O I：
10.6041/j.issn.1000-1298.2021.04.015
中图分类号：
学科分类号：
摘要：
In order to analyze the transient characteristics of tubular pump during non-regulative operating condition, a shaft-extension tubular pump with rapid-drop gate and slap doors attached was established, and a 3D numerical simulation for start-up process was investigated numerically. The rational speed was deduced by utilizing the moment balance equation. The movement of the gate with additional slap doors was specified based on the laying mesh and dynamic mesh technology. The simulation results showed good agreements with the test results. The result showed that the starting speed and the change of flow rate had obvious influence on the pressure gradient in the impeller section. The pump head was increased firstly and then decreased to the rated head during the start-up process. The maximum start head was 6.38 m at the time of 2.25 s, and the maximum pressure difference between front and rear of the slap door was 2.61 m. As a result, the outlet gate with additional slap doors could effectively reduce the maximum start head and improve the safety factor of the pump unit. Meanwhile, the additional slap doors on the gate played a good role in the shunt during the start-up process, which can avoid the system instability caused by excessive water pressure in the outlet passage when the impeller speed rose fast and the gate was not fully opened. © 2021, Chinese Society of Agricultural Machinery. All right reserved.
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页码：143 / 151
页数：8
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