On Noise Generated by Turbulence in a Pipe Downstream of a Discontinuous Area Enlargement
Experimental results of pressure fluctuations measured at the wall of a circular pipe downstream of a discontinuous area enlargement are presented. Close to the nozzle where the fluid enters the pipe like a jet, the wall pressure is generally dominated by turbulence, but farther downstream, under certain conditions, by sound which is sensitive to the acoustic pipe end conditions. By comparison with a pipe inlet flow it is found that the noise is mainly generated by the jet flow region. The agreement with results of acoustic duct theory based on uniform mean flow is good.
KeywordsStrouhal Number Wall Pressure Azimuthal Component Standing Wave Pattern Azimuthal Order
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