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Steam pipe valve flow characteristics of the noise source

Author: WangZuo
Tutor: LiuGongMin
School: Harbin Engineering University
Course: Marine Engineering
Keywords: Steam pipe valve Flow characteristics Large Eddy Simulation Fluctuating pressure Noise source characteristics
CLC: TH134
Type: Master's thesis
Year: 2011
Downloads: 123
Quote: 0
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Abstract


Steam piping system is an important part of the nuclear power plant , when the high temperature high pressure steam through a pipe valve , the valve components as noise source noise generated by the strong flow of radiated noise can not be ignored . In this paper, the numerical simulation method , a certain type of steam piping valves hydrodynamic characteristics and noise source characteristics were studied for the valve noise and low-noise provide a basis for the design of the valve . Firstly, the pipeline flow throttling element calculation model calculations were validated by comparing the results of several commonly used turbulence model and the degree of fit experimental values ??to determine the application of the standard k-ε model to calculate the steady-state pipeline throttling element flow field, application of large eddy simulation pipeline throttling element unsteady flow field and fluctuating pressure tube . Secondly , the application of PRO / E software for a certain type of cut-off valves and piping attached three-dimensional modeling , combined with the CFD software FLUENT the flow field inside the valve dimensional steady , unsteady numerical simulation . Comparison of the valve at different opening, different vapor pressure drop conditions of the flow field parameters , summed up the steam inside the valve flow characteristics . Finally, the study of the valve internal fluctuating pressure time-domain characteristics , and through the Fourier transform and averaged periodogram method, the internal valve pressure pulsation spectrum analysis and power spectral density analysis . Combined steam flow characteristics of the valve flow noise, location, type , frequency, and the main noise sources such as directional characteristics of in-depth research . The results showed that: the steam pipe near the outlet of the valve constriction segment most violent turbulence degree of change is mainly caused by noise and vibration . Steam pipe valve inside the flow noise is mainly concentrated in the low frequency noise is dominated by vortex . Valve opening, changes in import and export pressure drop caused by the internal valve on the pressure fluctuations had a great impact . In addition, the valve disturbance effects on the downstream region makes pulsating axial steam flow and pressure distribution characteristics of irregular fluctuations , while the ring was not obvious to the pulsating pressure directivity .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Control parts
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