Abstract
The second part of an experimental study of wall-pressure fluctuations on a circular rod concentrically located in circular channels of three different hydraulic diameters is reported. Part I presented results with no upstream disturbances; this report is concerned with the effects of upstream flow spoilers. Experimental results from the measurement of fluctuating wall pressures are presented in various statistical forms, including power spectral density representations and mean-square values, as the basis for studying the effects of upstream disturbances and hydraulic diameter. The upstream disturbance generated by a grid-type spoiler is shown to have a more dominant effect on wall-pressure fluctuations than the other types of spoilers tested.
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