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Date of Publication:2022-10-04

Journal:大连理工大学学报

Affiliation of Author(s):能源与动力学院

Volume:57

Issue:5

Page Number:453-458

ISSN No.:1000-8608

Abstract:Reactor coolant pump (RCP )of CAP1400 reactor coolant system is designed welded directly to the steam generator (SG)channel head,which makes the flow field in the SG channel head outlet nozzle non-uniform. To study the influence of inflow distortion on RCP performances, comparisons of energy, hydrodynamics and cavitation characteristics between non-uniform and uniform inflow conditions are carried out by CFD method through modelling integrally the channel head of SG and RCP impellers.Calculation results show that at 0.7Q0-1.2Q0 the inflow distortion reduces pump head and impeller torque by 1.8％-5.1％ and 1.9％-6.4％ respectively,and efficiency is not affected.With the decrease of head,axial loading drops slightly whereas radial loading increases significantly under non-uniform suction flow.As cavitation occurs,the critical NPSH of the pump increases,anti-cavitation performance is reduced and cavitation area appears obvious asymmetric.

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