プロペラの単翼に働く負荷変動に関する研究 : 翼の一部が水面上に露出する場合

概要

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The load fluctuation acting on a propeller blade in wave have investigated experimentally using the device to measure the load acting on a blade and reported. In this report, the load fluctuation acting on a blade under the condition that the propeller blade rises partially to the water surface have investigated experimentally using the same apparatus. The tank tests were carried out on the condition that the open propeller boat was restrained and the propeller revolution was controlled at a constant rate in the sti11 water to make the fundamental characteristic of the blade load fluctuation clear. And the experimental results were examined with the simplified estimation model. The followings were obtained. 1) On the condition that a blade rises partially to water surface, the load acting on the blade fluctuates terribly. It can be inferred that the torque acting on the blade is negative. 2) The reason of this result is considered that the force caused by the change of the added mass periodically through water surface acts on the blade along the rotational direction. 3) The effects of the change of the added mass upon the blade thrust is small. So, the thrust acting on the blade is positive even the blade pass through water surface.
社団法人日本船舶海洋工学会の論文
1992-09-25