Abstract
The effect of background flow oscillations on a transonic airfoil (NACA 0012) flow was investigated experimentally. The oscillations were generated by means of a rotating plate placed downstream of the airfoil. Owing to the expansion and compression waves generated at the plate, the flow over the airfoil flow was drastically disturbed. This resulted in the presence of high intensity oscillations of a shock wave and a separation bubble on the suction surface of the airfoil. For relatively large values of the airfoil angle of attack, weak shock waves (transonic sound waves) were periodically shed upstream of the airfoil.
This work was supported by Commission of the European Communities (Communit's Action for Cooperation in Science and Technology with Central and Eastern European Countries).
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References
Basler D (1987) Experimentalle Untersuchung der Ausbreitung stossinduzierter Störungen an transonischen Profilen. DLR Göttingen, Rep 87–28
Finke K (1977) Stoßschwingungen in schallnahen Strömungen. VDI Forschungsheft 580
Geissler W (1993) Verfahren in der instationären Aerodynamik. DLR Göttingen, Rep 93–21
Karashima K (1961) Instability of shock wave on thin airfoil in high subsonic flow. Aer. Research Inst. Univ. Tokyo, Rep. No 963
Lent H; Löhr K; Meier GEA; Miller K; Schievelbusch U; Schürmann O; Szumowski A (1990) Noise mechanisms of transonic vortex airfoil interaction. AIAA Paper No 90-3972
Mabey DG (1989) Some aspects of aircraft dynamic loads due to flow separation Progr Aerospace Sci 26: 115–151
Meier GEA (1974) Ein instationares Verhalten transonischer Strömungen. Mitteilungen aus dem Max-Planck-Institut für Strömungsforschung und Aerodynamischen Versuchsanstatt. Göttingen, Rep. 59
Naumann A (1965) Stoßschwingungen an Profilen. Abhandlungen aus dem Aerodynamischen Institut Aachen, Heft 18
Stasicki B; Hiller WJ; Meier GEA (1990) Light pulse generator for high speed photography using semiconductor devices as a light source. Opt Eng 29: 821–827
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The authors wish to thank Mr P. Koperski for his effective assistance in taking the photographs.
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Szumowski, A.P., Meier, G.E.A. Forced oscillations of airfoil flows. Experiments in Fluids 21, 457–464 (1996). https://doi.org/10.1007/BF00189048
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DOI: https://doi.org/10.1007/BF00189048