Flow Noise Study of Water Flowing Through Pipes

摘要

Sound pressure fluctuations produced by the turbulent flow of water through 0.494-inch 1D pipe of glass, plastic, and brass were measured at controlled flow rates from 0.65 to 9.6 fps, in the absence of extraneous noise. Hydrophone pickups, pipe wall fluctuations, and pressure differential along the boundary layer were recorded, reduced to quantitative graphic form, and were analyzed by harmonic and numerical methods. Broadband magnitudes were related to Reynolds numbers, pressure spectra were derived, and autocorrelations and power spectra were related. Theoretical methods for computing values of water flow noise were compared with quantitive findings, and a method for approximating the magnitude of flow noise for a range of conditions was derived. (Author)