Device and method for testing blade pump backflow vortex cavitation

Abstract

The invention provides a device and a method for testing blade pump backflow vortex cavitation. The device and the method are used for testing the backflow vortex cavitation performance and dynamic characteristics of a blade pump under small flow working conditions. According to the device, the blade pump is fixed to a working table; one pressure pulsation sensor is mounted at an organic glass inlet pipe 1*Ds away from an impeller inlet; a plurality of pressure pulsation sensors are correspondingly mounted in the circumferential direction of a volute flow channel every 45 degrees; a pressure pulsation sensor is mounted at a position 2*Ds away from a pump outlet pipe; and a sensor and a collecting card are sequentially connected in series to a computer system provided with signal acquisition and data processing software. According to the testing method, based on the situation that backflow is generated at the pump impeller inlet, the mainstream flow of a pump inlet and the hydraulic performance of the pump inlet can be affected, the internal pressure pulsation information of the pump is collected in real time through the pressure pulsation sensor, and the internal flow condition ofthe pump during backflow vortex cavitation is combined to accurately identify and judge blade pump backflow vortex cavitation.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics, and the invention relates to an experimental test method for cavitation of a centrifugal pump, in particular to a test device and method for realizing the reflux vortex cavitation of a vane pump. Background technique [0002] Centrifugal pumps can be widely used in electric power, metallurgy, coal, building materials and other industries to transport slurry containing solid particles. They are widely used in aerospace, petroleum, chemical, water conservancy and other important national economic fields. They have simple structure, reliable performance and convenient maintenance. Etc. 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, causing steam bubbles and sudden bursts in the liquid water flow, and easily There i...

AI Technical Summary

Problems solved by technology

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, causing steam bubbles and sudden bursts in the liquid water flow, and easily There is a low-pressure area in the suction pipeline, and the low-pressure area will lead to cavitation. In severe cases, it will induce low-frequency pressure pulsation in the centrifugal pump and its piping system, resulting in strong mechanical vibration, consuming energy, and reducing the operating reliability and work of the pump. performance

Images