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论文类型：期刊论文

发表时间：2017-12-01

发表刊物：ANNALS OF NUCLEAR ENERGY

收录刊物：Scopus、SCIE、EI

卷号：110

页面范围：1217-1223

ISSN号：0306-4549

关键字：Reactor coolant pump; Ultrathin-walled rotor-can; Shrink fitting process; Limited time; The heat capacity added layer

摘要：The rotor-can of reactor coolant pump (RCP) is generally assembled on the rotor using shrink fitting technique. The rotor-can is characterized by large height and ultrathin-walled cylinder, thus, its rigidity is weak and heat capacity is quite limited. The shrink fitting process has to be completed within a short limited-time, which makes it difficult for rotor to insert in the rotor-can completely. In order to solve this problem, a new method was proposed to extend the limited time by using a heat capacity added layer (HCAL) during the shrink fitting process. A thermal-mechanical coupled finite element (FE) model was developed to simulate the whole process. The transient heat exchange with a narrow gap between rotor and rotor-can during the shrink fitting process was taken into consideration. The limited time was predicted by calculating and analyzing the evolutions of temperature field and radial displacement field of the rotor-can. The simulation results indicate that the limited time of the shrink fitting process can be significantly extended with the increase of HCAL in thickness. Then, shrink fitting experiments were performed to confirm the extending effect of the HCAL. The experimental results of limited time show good agreement with the predicted values. The current results will certainly help the designer to improve the shrink fitting technique. (C) 2017 Elsevier Ltd. All rights reserved.