The Design And Performance Research Of Annular Self-oscillating Jet Pump

Currently liquid jet pump technology development has been constrained by two factors: energy transfer efficiency and cavitation.In order to enhance the work water entrainment performance,increase the efficiency of energy transfer,suppress ultimate cavitation conditions,design an appropriate jet pump structure has great theoretical and practical significance for the jet pump technology breakthrough.Self-excited oscillation pulse jet eliminates the need for external excitation source,but in engineering applications tend to enhance the impact crushing effect,has yet to see its use in raising sucked fluid entrainment capacity and efficiency of the energy transfer reports.This article combined the advantages of annular jet and self-excited oscillation pulsed jet,presented the idea of annular self-oscillating jet pump,annular oscillating jet pump from annular jet,self-excited oscillation pulsed jet combine the advantages presented annular oscillating jet pump from the idea,and study from the following aspects:Firstly,presented the self-excited oscillation annular jet pump design philosophy and structure,and established it's dimensionless parameters based on the study of annular jet pump and self-oscillating chamber.By the limited space constrained jet no reflux conditions and engineering requirements identified the self-excited oscillation annular jet pump size and operating parameters,established the numerical model of the article.Secondly,constructed frequency characteristics equations of jet pump oscillation jet between the nozzle geometry and motion parameters.Analysed the vortex-induced jet pump cavitation characteristics influence on jet pump performance.Finally,by numerical simulation researched the self-oscillation frequency characteristics and the vortex induced cavitation characteristics of jet pump internal flow field,and its impact on the performance of the jet pump.Finally,according to the internal flow characteristics of jet pump established the average time performance equation of annular self-oscillating jet pump.Analysed the performance of new jet pump by numerical calculations and comparison of annular jet pump.According to the jet pump performance equation.Research the different of geometric parameters and operating parameters on the annular self-excited oscillation jet pump performance.And according to the results of numerical analysis of the shortcomings of this paper preliminary design structure in some way,and made improvements to address these issues and improve the efficiency of the jet pump.