Propeller caviation in solutions of polyethylene oxide.
White, Robin John.
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The inception and formation rates of bubble cavitation on a l4.8-cm diameter, two-bladed propeller were measured in homogeneous aqueous solutions of polyethylene oxide, WSR-301, at concentrations ranging from to 100 wppm (weight parts per million). Rotational speeds ranged from 1300 to 2000 rpm. At concentrations of 25 wppm and greater, inception was delayed by approximately 150 rpm, and at 2000 rpm the number of bubble collapses measured over a 10-second period was reduced by at least 40 percent. If these results can be extended to full size propellers, ships can increase their propeller rotation rate while producing the same amount of cavitation noise. Measurements of the radiated noise spectra of bubble collapses showed that the higher frequency components are somewhat attenuated in polyethylene-oxide solutions.
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