翼型上に生じる Short Bubble の粘性-非粘性干渉法による解析

概要

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To predict the short bubble burst which is the cause of an airfoil leading-edge stall, it is necessary to establish an analytical method that can estimate the velocity distributions inside the short bubble when the airfoil angle of attack is increased. Viscous-inviscid interaction analysis has been conducted here to estimate the velocity distributions inside the short bubble. The eN method is applied to predict the point of transition onset inside the bubble. The eddy viscosity turbulence model is used whose constant is set to a uniform value inside the turbulent part of the bubble. The PIV measurements have been made for the short bubbles formed on NACA0012 airfoil at the chord Reynolds number of 1.3×105 at the angles of attack α of 6º, 8º and 10º to determine the values of constants used in the transition and turbulence models. Short bubbles formed on the same airfoil at the same flow conditions but at α=4º, 7º and 9º are analyzed by the present method. The results indicate that the present method predicts the formations of short bubbles fairly well at the angles of attack whose velocity profiles inside the bubble were not measured.
2004-10-05