Thermal Fluid-structure Coupling And Finite Element Analysis Of Butterfly Valve With Heating Band

Vacuum butterfly valve has the advantages of clean and oil-free,small volume,free from influence of medium flow,etc.It is widely used in the industries which need cleaning vacuum such as semiconductor manufacturing and biopharmaceuticals,etc.Under real work conditions,the vacuum butterfly valve might work in complicated and rigorous pumping environments,such as dust-containing particulate gas,the change of suction pressure and temperature.Therefore,it is significant to study the flow characteristics of the fluid in the vacuum butterfly valve and the heat distribution and thermal deformation of the valve.In this paper,the vacuum butterfly valve was researched by using the computational fluid dynamics(CFD)method,numerical heat transfer method and finite element analysis method(FEM).According to the structure of the butterfly valve,the three-dimensional model of structural components and internal flow area was established.The fluid and solid domains were meshed by using the ANSYS-ICEM software,and the CFD method was used to simulate the flow and heat field distributions in the valve under the conditions of steady-state and transient-state.Comparison of analytical results with theoretical calculations to verify the reliability of numerical simulation methods.The structural deformation of the butterfly valve was analyzed by using FEM under different thermal field distribution.Firstly,the steady-state flow simulation model of butterfly valve is established based on the CFD method and numerical calculations are performed for the average pressures of 10Pa,100Pa and 1000Pa.The simulation results are in accordance with the theoretical calculations.The maximum error between the simulated conductance and theoretical calculations is around 3.02%.The flow conductance of the butterfly valve was analyzed under different opening degrees.The average pressure of fluid is 10Pa and 100Pa,and the butterfly valve has the best adjusting ability when the opening is a?[15°,60°].The average pressure of the fluid is 1000Pa,and the butterfly has the best adjusting ability when the opening is ??[15°,75°].A transientstate flow simulation model of butterfly valve was established based on CFD method and dynamic grid technology and numerical calculations were performed for the average pressures of 10Pa,100Pa and 1000Pa,and the response lag time of the butterfly valve during the rotation of the buttefly plate was analyzed.The average pressure is 10Pa and 100Pa,the butterfly valve lag time is 0.0022s,the average pressure is 1000Pa,the butterfly valve rotates from still to start,the lag time is 0.0068s,from turning to static,the lag time is 0.011 s.Secondly,numerical calculations of different boundary conditions were carried out for the butterfly valve with opening degree of 45° and 75°,average pressure of 10Pa,100Pa and 1000Pa,natural wall convection and temperature of 321.15K,349.15K,378.15K.The influences of different pressure and different thermodynamic boundary conditions on the distribution of thermal field in the valve was analyzed.Finally,a butterfly finite element analysis model was established to analyze the structural deformation of the butterfly valve when there is a temperature difference between the valve body and the butterfly plate,and the variation of the butterfly valve clearance was obtained,which provided a way to further study the theory and design problems of the vacuum butterfly valve.