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Measurements of the pressure distribution along the solid wavy surface under the action of turbulent wind are presented for the sinusoidal wave and the Stokes wave, both of which have the same height-...to-length ratio H/L = 0.1. The experiment covers the range of the Reynolds numbers U_0H/ν from 4,000 to 14,000, where U_0 is the maximum wind speed over the wavy surface, H the height of the waves and ν the coefficient of kinematic viscosity of the air. Pressure measurements indicate that the pressure distribution along both wavy surfaces are described well by the first mode of the waves with the wave length equal to that of the wavy surfaces. Amplitudes of the first mode of the pressure profiles for both waves are nearly equal but the phase shifts relative to the waves are larger for the Stokes wave than for the sinusoidal wave. Thus the pressure drag coefficient of the Stokes waves is larger than that of the sinusoidal wave. An empirical relation between the Reynolds number and the pressure drag coefficient normarizecl by the maximum slope of wavy surfaces have been obtained, which can be applied to the Stokes waves as well as the sinusoidal waves with various steepness.続きを見る
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Mendeley出力
034103_p053