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Abstract In order to investigate the flow charateristics of residual heat removal pump under multi conditions，three-dimensional unsteady numerical simulations were conducted by using the SST turbulence model in ANSYS CFX．The performance、inner flow fields and pressure fluctuation of the residual heat removal pump under muiti conditions was obtained and compared with the experimental results．The results show that：the inner flow keep regular under 1.2Qd and 1.0Qd．However，with the decrease of the flow rate，The stall vortex generates near the suction side at the impeller and diffuser inlet associated with the onset of varying degrees of flow separation in the flow channels，which is intensified toward the outlet．The main frequency of pressure fluctuation at the outlet of impeller affected by the number of vanes is 7fz．The main frequencies at the outlet of both difusser and volute is 5fz，which are the blade passing frequency．The amplitudes of fluctuating pressure coefficient in all the monitoring points reach its minimum value under design condition，which increase gradually with the decrease of flow rate．It is concluded that the flow instabilites inside the pump occurs under small flow rate condition．
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Received: 14 July 2015
Published: 15 December 2016
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