... 毂径比 boss ratio 毂涡 boss vortex 艉膨出肋骨 bossed frame ...
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The boss vortex cavitation of propeller can be avoided by PBCF, and an increase of 2% in propulsion efficiency has been measured in the model tests.
桨毂帽鳍可改善毂涡空泡，模型试验状态下可提高推进效率2%左右。
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