Effect of wind tunnel wall porosity on the flow around an oscillating airfoil at transonic speeds

Document Type: Article

Authors

1 Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran

2 Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran

3 Department of New Science and Technology, University of Tehran, Tehran, Iran.

Abstract

The eff ect of porosity in oscillating situations (to the authors' knowledge, for the rst time) on a supercritical airfoil (SC0410) has been experimentally investigated. Tests have been carried out in an open circuit suction-type wind tunnel at a free stream Mach number of M = 0:80. Both static and dynamic (pitching) tests have been carried out on the mentioned airfoil. The oscillation frequency for the unsteady tests has been set
to 3 and 6 Hz. The amplitude of frequency is 1 deg. The eff ect of porosity has been surveyed on the magnitude of pressure uctuations, phase shift, and lift coecient loop. The investigations show that increasing porosity in the test section of transonic regime, contrary to the impression, does not necessarily improve results.

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