Lift Coefficients on a Supercavitating Jet-Flapped Foil Between Rigid Walls

概要

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The method of matched asymptotic expansions is applied to the first-order theory on the flow past a two-dimensional supercavitating jet-flapped foil in a wall tunnel, and a solution (=the slope of the jet) of the governing integro-differential equation is obtained and represented as the series expansion in ascending powers of δ and logδ multiplied by functions of the distance from the trailing edge, where δ is a small perturbation quantity proportional to thee jet momentum coefficient. Moreover, the lift derivatives with respect to incidence and jet deflection are obtained as the series expansions in ascending powers of δ and logδ. From the comparison with the previous paper (Ref.1), it is shown that the values of the lift derivative with respect to jet deflection agree closely with the numerical results, even if δ approaches unity.
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