翼型に発生する部分キャビテーションの非線形理論(第2報) : 翼面上圧力分布と後流内速度分布の計測

概要

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In a previous paper, the authors proposed a nonlinear theory for a partially cavitating hydrofoil and showed that the cavity shapes obtained from this theory agreed well with the experimental ones. In this paper, pressure distribution on the hydrofoil surface and velocity distribution in its wake were measured using the same foil section as before. Experimental lift and drag coefficients were calculated from the pressure distribution and the momentum loss of the wake. From these results, following conclusions were obtained. (1) The results obtained from this theory agree well with the experimental ones if the viscous effects are considered. However, when the cavity becomes unstable, the experimental pressure distribution on the suction side does not agree with the theoretical one. (2) The wake in cavitating case is wider than that in noncavitating case. This result shows that the occurence of cavity causes the velocity loss in the wake.