Structure Optimization And Acoustic Characteristics Analysis Of Axial Flow Gas Pressure Regulator

As the core component of the urban gas system,the axial flow gas regulator is of great significance for the regulation and transportation of natural gas.In this paper,DN150 axial-flow gas regulator is selected as the research object,and the numerical simulation and acoustic characteristics analysis of the axial-flow gas regulator are carried out by means of numerical simulation.In the process of numerical simulation of gas regulator,the Solidworks software is used to simplify the structure and model the regulator.Then the fluid calculation software Fluent was used to analyze it.Then the spring stiffness of the voltage regulator is calculated,the mechanical properties of the film are studied,the valve structure is optimized and the tension structure is optimized.Finally,the acoustic characteristics of the voltage regulator are studied and the sound pressure distribution law of the sound source inside and outside the voltage regulator is analyzed.Reduce the economic loss caused by poor performance of pressure regulating valve.In the valve port structure optimization of pressure regulator,it can be seen from the static pressure distribution cloud diagram that the pressure of natural gas is obviously abrupt when it enters the valve port from the valve seat due to the sudden change of the inner chamber geometry.In the geometric mutation position of the valve seat,the maximum static pressure of the valve reaches 7.56e5Pa,while in the sudden expansion position near the valve outlet,there is a significant pressure reduction,and the minimum pressure is 9.68e4Pa.In the valve mouth cavity,the obvious shock wave phenomenon appears.According to the analysis of velocity distribution cloud diagram,the minimum velocity appears in the valve seat sudden expansion area.In this area,the minimum value of velocity is obtained,and the velocity is almost zero.In the downstream sudden expansion position of the valve mouth,sudden change of velocity occurred.In the extremely narrow area,the velocity increased from 440m/s to 660m/s,and shock wave appeared.Finally according to according to the Angle and the relationship between the pressure drop,the final configuration scheme for selecting the optimal Angle is 130° Angle,outlet Angle 170°;In the optimization of the vara structure of the voltage regulator,the total pressure at the outlet of the two-channel vara structure is large,the pressure loss is small,the reflux area in the flow field is few,and there is almost no low-speed vortex at the outlet section,the flow rate is large,and the fluid flow performance is good.The flow disturbance inside the pressure regulating valve of the 6-channel vara structure is large,and the total pressure at the outlet is small.The pressure loss appears in the form of kinetic energy dissipation,and the central area of the outlet section generates obvious vortex area,resulting in poor overall flow performance.Therefore,the two-channel vara structure should be used in the engineering design,so that the regulator has good flow characteristics in operation,stable and reliable work.Finally,the aerodynamic noise of the regulating valve is analyzed,and the time-domain information in the fluid numerical simulation is converted into the acoustic information required by acoustics through the Fourier transform,and then the acoustic characteristics inside and outside the regulating valve are analyzed.