Noise Characteristics Analysis And Optimization Design Of Pressure Reducing Valve For High Temperature And Pressure Superheated Steam

As an important control element in the energy system,the high temperature and pressure superheated steam pressure reducing valve plays a key role in regulating the flow and pressure of the fluid medium and ensuring the safe,efficient and economic operation of the unit.With the continuous development of industry,the requirements for high temperature and pressure superheated steam pressure reducing valves are also increasing.It is of great theoretical significance and practical value to study the characteristics of medium flow and aerodynamic noise in the high temperature and pressure superheated steam pressure reducing valve,to optimize the design of the valve,to improve the performance of the valve and to explore the future development trend of the valve.Because the internal flow field of the high temperature and pressure superheated steam pressure reducing valve is usually complex and changeable,which is difficult to observe directly through experiments,this paper takes the high temperature and pressure superheated steam pressure reducing valve as the research object.Firstly,the internal flow field is analyzed by numerical simulation,and the flow field characteristics of the high temperature and pressure superheated steam pressure reducing valve are explored by numerical simulation,then the high temperature and pressure superheated steam pressure reducing valve is explored The aerodynamic noise characteristics of the steam pressure reducing valve.Finally,the optimization design is carried out for the noise problem of the high temperature and pressure superheated steam pressure reducing valve.The specific research contents are as follows:(1)Using the CFD software FLUENT preprocessing software ICEM CFD,the grid division of the high temperature and pressure superheated steam pressure reducing valve is carried out.The characteristics of the steady flow field of the valve at 20%,40%,60%,80% and full opening are studied.On the basis of the steady flow field,the transient flow field of the superheated steam pressure reducing valve is simulated and analyzed,which provides support for the next research of the sound field analysis.(2)On the basis of flow field analysis,the frequency spectrum of aerodynamic noise of high temperature and pressure superheated steam pressure reducing valve is analyzed by FW-H aeroacoustic model in fluent software,and the frequency spectrum characteristic curve of turbulent flow field is obtained,thus the frequency spectrum range of noise is determined.(3)By optimizing the structure of the valve core of the high temperature and pressure superheated steam pressure reducing valve,and optimizing the number of sleeve holes,the flow field characteristics and aerodynamic noise spectrum analysis of the optimized superheated steam pressure reducing valve are analyzed,and the superheated steam reduction before and after optimization whether the pressure valve achieves the purpose of noise reduction.