Numerical prediction method for internal reflux and reflux vortex cavitation of vane pump

Abstract

The invention discloses a numerical prediction method for internal reflux and reflux vortex cavitation of a vane pump. The numerical prediction method is used for predicting the internal reflux and reflux vortex cavitation phenomenon of the vane pump when the vane pump operates under a small-flow working condition. The method comprises the following steps: 1) separately carrying out numerical calculation on steady flow in a pump and cavitation flow in the pump under different working conditions in CFD software, extracting flow field information, and obtaining impeller cavitation bubble distribution; and (2) based on a numerical calculation result in the step (1), carrying out numerical calculation of unsteady flow in the pump , and setting related pressure pulsation monitoring points, andperforming unsteady numerical simulation on the typical working condition points, and extracting flow field and pressure pulsation information; and 3) comparing the dominant frequencies of the monitoring points based on the step 2), carrying out phase correlation analysis on the pressure pulsation signals to obtain the number of unstable flow units and corresponding axial and radial characteristics, and comparing and analyzing critical working condition points of backflow and backflow vortex cavitation based on the flow field information of the step 1) and the step 2).

Description

technical field [0001] The invention belongs to the technical field related to vane fluid mechanical cavitation, and in particular relates to a numerical prediction method for internal backflow and backflow vortex cavitation of a vane pump. Background technique [0002] Vane pumps are widely used in important national economic fields such as aerospace, petroleum, chemical industry, and water conservancy. They have the advantages of simple structure, reliable performance, and convenient maintenance. When the pump is operated under design conditions, especially in small flow conditions, backflow is likely to occur at the inlet of the centrifugal pump, and the pressure in the center of the backflow vortex is extremely low, and a low-pressure area is likely to appear in the suction pipeline, and the low-pressure area will cause Cavitation occurs. [0003] Cavitation phenomenon generally exists in pump rotating machinery and other hydraulic machinery. For pump rotating machinery...

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Problems solved by technology

Due to the problems of long design period and high design cost in the test method; therefore, in order to solve this problem, a numerical prediction method of centrifugal pump backflow and backflow vortex cavitation based on CFD numerical calculation is proposed

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