Aerodynamic Characteristics of Porous Sails in Cascade : 2nd Report, For Sails of the Same Shape

Abstract

A method is presented for the aerodynamic characteristics of the cascade of porous sails with the same shape. In this analysis the authors apply a series of Jacobi's polynomials to express the pressure distribution and chordwise shape. As the result of this numerical analysis, the effects of porosity and relaxation on the coefficient of lift and the position of the center of pressure are shown in diagrams as functions of solidity and stagger angle. With an increase in the porosity, the critical relaxation varies greatly with the stagger angle. The maximum eigenvalues of tension coefficient depend on the stagger angle and solidity, but when the porosity is large they do not vary with the stagger angle.