Research For Vibration And Noise Due To Airflow Of Main Steam Isolation Valve In Nuclear Power Station

National large-scale development of nuclear power requires self-reliance in nuclear technology and home-made manufacture. Our country already has the design and manufacturing capabilities for ordinary nuclear grade valves. But the high demand valves as the Main Steam Isolation Valve(MSIV) has not yet for the completion of independent R&D which is one of the most important items of nuclear equipments in"Replace Importation by Homemade"project because of its strict technical standard and high safty coefficient. During the operation of some nuclear power station, MSIV gets the problem of vibration and noise due to airflow, which leads to the damage of valve accessory. In response to this situation, following a series of studies carried out in the purpose of providing independent technical support for production of MSIV:Carrying out three-dimensional modeling on the flow channel of MSIV with PRO/E. Use the method of numerical simulation to calculate the inner 3D onflow field of MSIV wth CFD software FLUENT. In order to find the reason of vibration and noise, Study the flow characteristics of 3D turbulent field with two methods of Time-Average flow analysis and Large Eddy Simulation (LES). Based on the 3D modeling on the pipeline system of MSIV, use ANSYS to make the Structural Modal Analysis for the pipeline system of MSIV and the Acoustic Modal Analysis for the chamber composited by MSIV cavity, valve body and the import and export of pipelines. Study to find the sound and vibration coupling relation of steam turbulence and structure, which is verified by means of experimental analysis.Verify the new self-developed MSIV with the methods above. Provide optimal recommendations on the structure design to avoid the phenomenon of vibration and noise.