Erosion Analysis And Structural Optimization Of Large Flow Surface Plunger Type Throttle Valve Based On CFD

In the oil exploration and extraction process,the throttle valve is one of the essential and important equipment in the production process.Its main role is to balance the downhole pressure and flow control.The main components are the handle,stem,plunger,spool and body.The opening of the throttle valve is adjusted by operating the handle to control the height of the stem and plunger position,thus achieving pressure and flow control.The actual working conditions of the field application are high speed,high pressure,and contain solid phase particles,etc.Among them,erosion and wear are the main causes of throttle valve failure.By analyzing the working conditions of the throttle valve and reading literature,it can be seen that the main factors affecting the erosion law of the throttle valve are the liquid-solid two-phase flow rate,solid particle diameter,and liquid-solid mass flow rate.In order to extend the service life of the throttle valve,this article takes the plunger type throttle valve as the research object and establishes a finite element simulation model based on Fluent software.By analyzing the flow field characteristics and erosion wear at the throttle valve core under different working conditions,the effects of different flow rates,particle diameters,and mass flow rates on the throttle valve are obtained.Then,by changing the structural parameters of the throttle valve and analyzing the impact of the structure on the erosion pattern under specific working conditions,the parameter range with a smaller maximum erosion rate is determined.Finally,based on the response surface optimization method,a reasonable simulation scheme was set up,and the local optimal parameters with the minimum erosion rate were obtained using Design Expert data processing software.The main research conclusions of this article are as follows:(1)Through erosion simulation,it was found that under different opening angles,the larger the fluid velocity,the faster the flow field velocity of the throttle valve,and the greater the maximum erosion rate at the throttle valve core,resulting in more severe erosion.To reduce erosion,the flow velocity passing through the erosion valve should not be too large;Under different opening angles,the larger the particle diameter,the faster the flow velocity of the throttle valve.The maximum erosion rate at the throttle valve core slowly increases,and the erosion at the throttle valve core becomes more severe,but the impact is smaller than the flow velocity;Under different opening angles,the larger the mass flow rate,the greater the maximum erosion rate at the throttle valve core,and the more severe the erosion at the throttle valve core.(2)Through erosion simulation,it was found that when the flow rate,particle diameter,and mass flow rate are constant,the smaller the opening,the greater the flow velocity of the throttle valve,the greater the maximum erosion rate,and the faster the increase.Therefore,the throttle valve should work at a certain opening.(3)Through erosion simulation,it was found that when the chamfer is reduced,the flow velocity of the throttle valve increases,but the erosion rate is not directly proportional to the flow velocity.It is recommended that the optimal chamfer be 9°～12°or 45°～50°;When the opening radius is within 28mm-32 mm,taking a certain value can minimize the maximum erosion rate;For the throttle valve shown in the text,the optimal size parameters are a chamfer angle of 35°,an opening radius of 28.77 mm,and a step distance of 1.08 mm from the smallest flow port.