Numerical Simulation And Optimization Of Internal Flow Field Of A Control Valve For A Test System

As an important control element,the regulating valve is widely used in pipeline systems.With the continuous development of the industry,the regulation performance and design requirements of the regulating valve are also constantly improving.It is of great theoretical significance and practical value to study the internal medium flow state and regularity,optimize the design,improve the performance,and explore the future development trend of the regulating valve.Because the internal flow field of the regulating valve is usually complicated and variable,it is difficult to observe directly through the experiment.Therefore,the regulating valve was taken as the research object in this paper.Firstly,the internal flow field was visually analyzed by numerical simulation.The numerical simulation combined with the flow experiment method was used to explore.The flow characteristics of the valve were adjusted,and then the control valve was optimized by theoretical calculation.Finally,it was explored whether the shape change of the optimized valve plug would cause resonance.The details are as follows:(1)The structure and working principle of the regulating valve were introduced.Combined with the Bernoulli equation of fluid mechanics,the flow equation of the regulating valve was derived.The inherent flow characteristics of the regulating valve were described in detail.The solution process of CFD,computational fluid mechanics governing equations,turbulence model and other basic theoretical knowledge were introduced to lay the foundation for subsequent numerical simulation.(2)Three-dimensional models of the regulating valve with different opening degrees were established through SolidWorks.Then the flow channels were extracted.The flow paths were meshed by ICEM.Through Fluent numerical simulation of the internal flow field under different opening degrees of the valve,the detailed view of the flow fields in the regulating valve were obtained.The varieties of pressure,speed in the regulating valve were analyzed as well.According to the numerical simulation results,the flow coefficients under different pressure difference were calculated.The flow coefficient and flow characteristic curve were drawn.(3)The flow characteristic experiment of the regulating valve was carried out to obtain its actual flow characteristics and the experimental results were compared with the simulation results.The valve body surface of the regulating valve was designed by theoretical calculation method,and the regulating valve spool was optimized accordingly.(4)The fluid-solid coupling modal analysis of the optimized regulating valve was carried out to obtain the natural frequency of the wet mode.Under the actual working conditions,the numerical simulation of different opening degree regulating valves was carried out to obtain the flow noise frequency and the vortex shedding frequency;the natural frequency and the flow noise are obtained.The frequency and the vortex shedding frequency were compared to further determine whether the optimized regulator valve will resonate.