Investigation of upstream moving pressure waves on a supercritical airfoil |
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| Institution: | 1. Laboratory of Applied Thermodynamics, Department of Mechanical Engineering and Aeronautics, University of Patras, Patras 26500, Greece;2. Laboratory of Signal Processing and Communications, Department of Computer Engineering and Informatics, University of Patras, Patras 26504, Greece;1. Reaction Engineering and Combustion, Vienna University of Technology, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna, Austria;2. Physico-Chemical Fundamentals of Combustion (PCFC), RWTH University, Aachen, Schinkelstraße 8, 52062 Aachen, Germany;1. Aero Science Key Lab of High Reynolds Aerodynamics at High Speed, AVIC Aerodynamics Research Institute, PO Box 701, Shenyang, 110034, China;2. Department of Mechanical and Aerospace Engineering, Western Michigan University, Kalamazoo, MI 49008, USA;3. Liaoning Key Laboratory of Advanced Test Technology on Aviation Propulsion System, Shenyang Aerospace University, Shenyang, 110136, China;1. The Graduate School, Department of Mechanical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea;2. Department of Mechanical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea |
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| Abstract: | The present work is a preliminary experimental and numerical investigation of wave processes taking place in the flow field on a supercritical airfoil in a defined Mach and Reynolds number range. These waves which originate near the trailing edge propagate upstream in the subsonic region and become apparently weak near the leading edge. Time-resolved pressure measurements performed, reveal the unsteady behaviour of these waves. The frequencies measured are in the order of kHz. The wave structures can also be seen on corresponding time-resolved shadowgraphs. Not yet fully understood, however, is the mechanism which generates the waves as well as their interaction with the boundary layer. Early numerical investigations show that the wave formation is coupled with a vortex formation in the boundary layer. |
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