Annular Nozzle Jet Pump Performance Research Based On The CFD

Annular jet pump(AJP)is a kind of fluid machinery and mixed reaction equipment that uses high-speed jet as power to transfer momentum.It is widely used in engineering practice,such as AJP oil production in the crude oil production process,AJP for fishery fish transport,The use of annular jet pumps in water plants to pump liquid chlorine and helium,etc.,has contributed to the development of the national economy.The disadvantage is that due to the large loss of energy during the mixing process of the working fluid and the sucked fluid,the efficiency of the AJP is lower.Therefore,in these applications,people are most concerned with the analysis of the influencing factors of the efficiency of annular jet pumps.The research on the influencing factors of the efficiency of the AJP is an important basis in the design and production of the AJP.In previous studies,most researches focused on the efficiency of annular jet pumps under equal-density systems.However,in practical engineering applications,the working fluid and the sucked fluid tend to exhibit non-isoelectric density.When the results of the research under the isobaric density system are applied in practice,large errors will occur,which seriously limits the application of the AJP.For this reason,it is very realistic and instructive to explore the factors influencing the efficiency of the AJP in the non-isokinetic system.In this paper,AJP is taken as the research object,and the turbulent flow in AJP under non-isopotential system is studied,and the flow field and flow law are analyzed and explored.In the course of the study,the basic equations of the AJP were deduced,and the curves of q-h and q-η were obtained when the area ratio a=3.11.Then use FLUENT simulation software to simulate and analyze how the density ratio,speed ratio,and rotating speed affect the velocity field,pressure field,and efficiency value of the AJP.Finally,the orthogonal test method and numerical calculation method are combined to find the simulation of this paper.The optimal solution in the process:Density ratio 2.0,Speed ratio 40,Rotating speed Orad/s,and the three primary and secondary sequences affecting the efficiency of the AJP:rotating speed,speed ratio,density ratio.