任意断面型の帆の特性(日本航海学会第24回講演会)

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タイトル別名
  • The Aerodynamic Characteristics of an Arbitrary Sail Profile
  • 任意断面型の帆の特性
  • ニンイ ダンメンガタ ノ ホ ノ トクセイ

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抄録

A sail transforms its profile according to the alteration of the state of air currents around it. Therefore, when the profile of a sail is known, the pressure distribution on the profile and other aerodynamic characteristics of the sail can be estimated. In this paper, the author studied theoretical solutions for an arbitrary profile of a sail in two-dimensional flow. Let the profile of a sail, the force P right to the sail, produced by the pressure of both sides and the tensile force T acting parallel to a sail surface be expressed by equations (1), (2), (3), with parameter x, their geometrical relations being shown in Fig.1, where α is angle of attack. Whereupon, the function F_2(x) of pressure distribution expressed by (2) is obtained as (4), and lift coefficient C_L, drag coefficient C_D, moment coefficients around leading edge (C_<ma>) and trailing edge (C_<mb>) and the position of centre of pressure are given by (7), (8), (14), (15), (16) respectively, with function F_1(x), C_T and chord length C. An accurate coefficient of tension C_T is determined by the actual measurement only. Therefore, its approximate quantities are presented with some assumptions referring to theoretical lift coefficient of a circle and experimental values of sail model Nr 1814 at Gottingen.

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