The Measurements of Aerodynamic Forces on Oscillating Airfoils with a Mach-Zehnder Interferometer

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  • マッハ・ツェンダ干渉計による振動する翼形に作用する空気力の測定
  • マッハ ツェンダ カンショウケイ ニヨル シンドウスル ヨクガタ ニ サヨウス

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The measurements of the aerodynamic forces acting on an oscillating two-dimensional NACA 0012 wing section were performed with a 120 mmφ Mach-Zehnder interferometer for the range 0.0 to 0.025 of the reduced frequencies.<BR>The slopes and the sizes of the loops of the normal force and the pitching moment coefficients were found to be appreciably smaller than the theoretical ones by Theodorsen's theory of an oscillating flat plate. The effect of the boundary layer along the wing surface to these discrepancies is discussed based on Theodorsen's theory applied to an oscillating flat plate with aileron, the amplitudes of which were estimated from Schlieren photographs of the boundary layers of two-dimensional 12% and 16.7% elliptic airfoil sections.

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