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research-article

Numerical and Experimental Research on the Fluid Induced Forces of Clearance Flow in Canned Motor Reactor Coolant Pump

[+] Author and Article Information
Xu Rui

School of mechanical engineering, Shanghai Jiao Tong University, Shanghai 200240, China
sharry0727@sjtu.edu.cn

Long Yun

Research Center of Fluid Machin-ery Engineering and Technology, Jiangsu University, Jiangsu 212013, China
longyunjs@outlook.com

Yaoyu Hu

School of mechanical engineering, Shanghai Jiao Tong University, Shanghai 200240, China
huyaoyu@sjtu.edu.cn

Junlian Yin

School of mechanical engineering, Shanghai Jiao Tong University, Shanghai 200240, China
jlyin@sjtu.edu.cn

Dezhong Wang

School of mechanical engineering, Shanghai Jiao Tong University, Shanghai 200240, China
dzwang@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041756 History: Received April 15, 2018; Revised October 15, 2018

Abstract

Reactor coolant pump is one of the most important equipment of the coolant loop in a pressurized water reactor system. Its safety re-lies on the characteristics of the rotordynamic system. For a canned motor reactor coolant pump, the liquid coolant fills up the clearance between the metal shields of the rotor and stator inside the canned motor, forming a long clearance flow. The fluid induced forces of the clearance flow in canned motor reactor coolant pump and their effects on the rotordynamic characteristics of the pump are numeri-cally and experimentally analyzed in this work. A transient computational fluid dynamics (CFD) method has been used to investigate the fluid induced force of the clearance. A vertical experiment rig has also been established for the purpose of measuring the fluid in-duced forces. Fluid induced forces of clearance flow with various whirl frequencies and various boundary conditions are obtained through the CFD method and the experiment. Results show that clearance flow brings large mass coefficient into the rotordynamic system and the direct stiffness coefficient is negative under the normal operating condition. The rotordynamic stability of canned motor reactor coolant pump does not deteriorate despite the existence of significant cross-coupled stiffness coefficient from the fluid induced forces of the clearance flow.

Copyright (c) 2018 by ASME
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