Study On Flow Field And Regulating Performance Of Sliding Regulating Valve

Regulating valve is a control element that changes the pressure and flow of the system by changing the opening of the valve to change the parameters of the system pressure and flow.As an important regulator in the industrial fluid pipeline system,its performance is associated with the excellent performance of the system as a whole.The internal flow field of the traditional regulating valve is uneven,and it is easy to produce large area of eddy current.Under the condition of multiphase flow,especially the multiphase fluid containing solid particles,because the traditional regulating valve is not conducive to the flow of this kind of fluid,it will cause the particles to attach,accumulate and plug the regulating valve on the inner surface of the valve,so that the pipe system can be used.It will cause impact,affect the stability of the system and regulate the performance of the regulating valve.A new type of control valve is studied in this paper.Its valve core stroke is parallel to the fluid flow direction.The valve body and valve core of the control valve are streamlined in structure,and have the advantages of uniform flow field,small eddy current area,good circulation performance and small impact on pipeline system.The control valve has good applicability for multi-phase fluid,especially for multi-phase fluid containing solid particles,which has better circulation and regulating performance compared with traditional control valves.The study will be based on the new sliding regulating valve,which provides some supplementary significance for the improvement of the types of regulating valves in industry.The contents of the article are as follows:(1)Analyze and understand the research status of flow field and regulating performance of the control valve,summarize the development trend of the regulating valve and the deficiency of the traditional regulating valve.(2)The flow control equation and numerical method under the axial symmetry are established according to the flow characteristics of the sliding regulating valve,and the numerical method used in the valve is verified by the flow model of the backstage order and the flow model of the hole plate.(3)The physical model of a symmetrical valve core sliding valve is set up.The flow field distribution under different valve core position and Reynolds number is simulated.The flow resistance change and flow characteristic curve of the valve in the process of mediation are obtained.The influence law of the flow field of valve core position,fluid flow direction and Reynolds number on circulation performance and regulating performance are studied.(4)The physical model of asymmetrical valve core sliding valve is established,and the flow field distribution of the valve under different working conditions is simulated.The flow resistance change and flow characteristic curve of the valve in the process of mediation are obtained,and the numerical simulation results of the symmetrical valve core and asymmetric valve core are compared,in order to explore the regulation of the effect of regulating performance on the flow field and circulation of the valve core structure to the regulating valve.(5)The modified valve core is an asymmetrical retractable valve core structure,and the flow field of the regulating valve is simulated.The flow resistance change and the flow characteristic curve of the valve during the mediation process are obtained.Comparing the flow field and regulation performance of the three valve core structure regulating valves,the asymmetric retractable valve core is determined as the target valve core.Taking the uniform flow field and drag reduction as the criterion,the structure of the valve body of the asymmetrical retractable sliding control valve is optimized.