Abstract
To make clear the flow domain of erosive cavitation arisen in the typical bounded flows though butterfly valves, the spatial distributions of cavitation-induced pressure-pulses, which are directly related to the occurrence of the cav-itation, are precisely studied by using pressure-sensitive-films in the downstream region of a valve, where very erosive vortex cavitation takes place predominantly. It is found that the erosive pressure-pulses are distributed in limited parts of the whole cavitating region, which corresponds the highly shear layers separated from the leading edge of the valve disc on the orifice side.
