舶用プロペラにおける翼端特異性に関する研究 (第1報)

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タイトル別名
  • A Method for Treating the Singularity at the Blade Tip of Marine Propellers
  • ハクヨウ プロペラ ニ オケル ヨクタン トクイセイ ニカンスルケンキュウ 1

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Methods for calculating the hydrodynamic load distribution on the blade of marine propllers are discussed.<BR>The numerical solutions of the existing lifting surface theories do not converge at the parabolic wing tip on account of the singularity. The restriction in the existing theories can be removed by using the new integral equation presented by Dr. Hanaoka11) .<BR>Employing the new integral equation, a numerical procedure is developed for the steady propeller. In the present method, the range of validity of propeller lifting surface theory is extended to include the tip of blade.<BR>The method is applied to an usual broad bladed propeller and to a highly broad bladed propeller. The result is compared with the calculations by the existing mode function method4) and by the new doublet-lattice method16) . The new doublet-lattice method is the method devised to give the accurate solution near the leading edge.<BR>Following facts are revealed by the results of the numerical investigation. (1) Accurate solutions for the hydrodynamic load distribution near the tip of blades are obtained by the present method. (2) For the case of a highly broad bladed propeller, the existing mode function method is invalid and the present method should be used. (3) The present method is useful for the calculation of cavitation. (4) For the case of an usual broad bladed propeller, the existing mode function method is valid in wide range up to 0.9 radius. The method is useful for the calculation of propeller forces. (5) The new doublet-lattice method gives the converged chordwise load distribution. The method is supposed to give the accurate solution near the leading edge and to be useful for the calculation of cavitation.

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