Study On The Entrainment Properties Of The Annular Self-excited Oscillating Jet Pump

Jet pump with its simple structure,easy processing,good sealing and no moving parts and other unique advantages has been widely used in various generating departments.Due to the constraints of energy efficiency and cavitation effection,the development of jet pump has encountered bottleneck.It has been shown that unsteady jets can improve the efficiency of jet pump to a certain extent.As a new type of pulsed jet self-excited oscillating jet At present,it is inclined to enhance the application of export impact crushing effect,and it has little reports on its improvement of entrapment performance and energy transfer efficiency.In this paper,the combination of annular jet and self-excited oscillating jet is proposed,and the idea of annular self-excited oscillating jet pump is put forward.The main work made herein are as follows:(1)The design concept and structural design of the annular self-excited oscillating jet pump are put forward,and the relevant numerical calculation model is established.Based on the principle of the highest efficiency,the structural parameters of the new self-excited oscillating jet pump are optimized,Better combination of structural parameters;(2)The internal flow field characteristics of the new self-excited oscillating jet pump are studied by using Fluent finite element analysis software.The distribution of pressure field,velocity field and turbulent flow field in the flow field of the new jet pump is revealed,Understanding of the mechanism;(3)Based on the basic theory of fluid mechanics and the stable equilibrium equation of gas core,the judgment condition of cavitation is analyzed,and the periodic development law of vortex cavitation airbag in the flow field of jet pump is studied.Using fluid network theory,The frequency analysis expression of the self-excited oscillating jet pump is deduced,and the oscillation effect and frequency characteristics in the flow field are studied.