Abstract
In this paper, surface pressure and NACA0012 airfoil flows are measured by wind tunnel test with inflow turbulence using the active turbulence generator (ATG) in order to clarify unsteady airfoil flows behavior contributed to airfoil noise under atmospheric turbulence. Turbulence intensity of the inflow can be changed from 9.3 % to 19.5 % and integral scale of the inflow can be changed from 298 mm to 1592 mm. The Reynolds number based on the chord length of the airfoil and flow velocity is 3 × 10^5. As the results, short bubble generated on suction surface seems to be disappeared by the inflow turbulence. The turbulent intensity affects static pressure fluctuation on the leading edge of the airfoil. The integral scale affects fluctuating surface pressure from the leading edge to the trailing edge. The inflow turbulence does not affect only increasing of uniform flow turbulence, but also increasing of airfoil flow close to the suction surface.
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