Large Eddy Simulation and FW-H Acoustic Analogy of Flow-Induced Noise in Elbow Pipe
When flowing through an elbow pipe, due to turbulence and vortexes, natural gas is most likely to generate flow noise. This study evaluates the noise of an elbow pipe in a gathering station, based on a large eddy simulation and FW-H acoustic analogy. First, the flow field of the elbow pipe is modulated with different angles, and the sound pressure level is evaluated. Influenced by secondary flow, the flow noise of the internal pipe wall is higher than the flow noise of the other walls, while the sound pressure level of the external pipe wall is relatively low; however, due to the influence of the gradually varied flow, the noise of the internal wall shrinks with the decreasing angle of the elbow pipe. Further research mainly focuses on an elbow pipe with a right angle (90°) and analyzes the flow noise under different pressures and velocities of the fluid. With increasing velocity, the flow noise of the elbow pipe increases but remains roughly plain; when the pressure increases by 0.1 MPa, the sound pressure level of the pipe increases by 1 dB ∼ 3 dB. Therefore, numerical calculations provide theoretical evidence for elbow selection and flow noise prevention in a gathering station.
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Document Type: Research Article
Publication date: September 1, 2015
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