Effects of Polyethylene-Oxide Solutions on the Performance of a Small Propeller.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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The thrust and torque were measured and the efficiency calculated for a 14.6-cm diameter, two-bladed propeller in aqueous solutions of polyethylene oxide, WSR-301, with concentrations ranging from 0 to 75 wppm weight parts per million. The full operating range fo the propeller was studied. For the propeller operating under heavily loaded conditions, the thrust decreases with increasing concentration while the torque passed through a minimum at 10 wppm. This resulted in a increase in efficiency of up to 10 at 10 wppm. For the propeller operating under lightly loaded conditions, the polymer had little effect on performance. If these results are applicable to full-sized propellers, drag-reducing polymers would not affect propeller performance significantly. Acoustic measurements were also made and they indicate that the polymer has no effect on the strength of the discrete components of the radiated propeller noise. Author
- Marine Engineering
- Fluid Mechanics