Analysis Of Opening And Closing Process Of Axial Flow Check Valve And Design Of Drag Reduction

Axial flow check valve,as a key part of the long-distance pipeline and the outlet of the power source device,has the advantages of low flow resistance,low noise,smooth running performance,good sealing and rapid opening and closing,etc.and is widely used.The opening process of the axial flow check valve requires quick opening in a short period of time,and the flow resistance is small in the fully opened state;the check process requires fast throttling and slow closing,the impact of the valve disc on the valve seat is small,and the water hammer resistance is strong.At present,the research progress of axial flow check valves is slow,and a perfect design system has not yet been formed,and comprehensive performance needs to be improved.Based on the existing axial flow check valve,this subject uses the advantages of numerical simulation to achieve the improvement of the two performances of the opening and closing process and drag reduction through structural optimization.Mainly conducted the following studies.(1)In order to optimize the problem that the valve disc has a large impact on the valve seat during the check process of the axial flow check valve,a buffer device is added to the existing structure to control the check valve's check speed and reduce the Impact,and then dynamic simulation of the opening and closing process of the optimized front and rear axial flow check valve.The results show that the movement speed of the valve flap is controlled within a certain range after the buffer device is installed,and its opening performance is basically the same as that before the installation,and the optimization is completed.(2)Based on the Venturi effect,the elliptical cluster method and the calculation formula of the valve body flow path,the internal flow path structure of the axial flow check valve in the fully opened state was optimized.The design process was elaborated in detail.The three variables that have the most influence are their parameters and their ranges.(3)Orthogonal experiment design is performed on the determined three variable parameters and their ranges,and all combination models with different variable parameters corresponding to different structures are obtained.Use 3D software to build 3D models of all combinations,and then simplify the models appropriately.Use flow field simulation software to numerically simulate axial flow check valves in the fully open state corresponding to all structural combinations.The value of the pressure drop,and then the analysis of variance of the results,to obtain the significance of the impact of each variable parameter on the value of the pressuredrop.(4)After the significance of the three variables is determined,it can be known that one of the variable parameters has little effect on the pressure drop value.It is determined by a single factor,and the other two factors are designed by orthogonal experiment,modeling,and flow field simulation.As a result,Biharmonic spline interpolation was performed on all the results to obtain the optimal structural parameter corresponding to the minimum value of the voltage drop.The results show that the flow resistance coefficient of the axial flow check valve after optimization is reduced by 38.21% compared with that before optimization,and the drag reduction design of the axial flow check valve is realized.