Abstract
Unsteady flow fields of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. “Vortex ring state” is captured numerically for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The vorticity of the vortex ring is found to be supplied by tip vortices. The aerodynamic characteristics are in good qualitative agreements with experiments.
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References
McCroskey, W. J., “Vortex Wakes of Rotorcraft,” AIAA paper 95-0530, Jan., 1995.
Leishman, J. G. and Bagai, A., “Challenges in Understanding the Vortex Dynamics of Helicopter Rotor Wakes,” AIAA paper 96-1957, June, 1996.
Tung, C., Yu, Y. H. and Low, S. L., “Aerodynamics Aspects of Blade-Vortex Interaction (BVI),” AIAA paper, 96-2010, 1996.
Conlisk, A. T., “Modern Helicopter Aerodynamics.” Annual Review of Fluid Mechanics, Vol. 29, 1997, pp.515–567.
Washizu, K., Azuma, A., Kōo, J. and Oka, T., “Experiments on a Model Helicopter Rotor Operating in the Vortex Ring State.” Journal of Aircraft, Vol. 3, 1966, pp.225–230.
Azuma, A. and Obata, A., “Induced Flow Variation of the Helicopter Rotor Operating in the Vortex Ring State,” Journal of Aircraft, Vol. 5, 1968, pp.381–386.
Xin, H. and Gao, Z., “An Experimental Investigation of Model Rotors Operating in Vertical Descent,” Proceedings of the 19th European Rotorcraft Forum, Cernobbio, IT, 1993.
Srinivasan, G. R., Baeder, J. D., Obayashi, S. and McCroskey, W. J., “Flowfield of a Lifting Rotor in Hover: A Navier-Stokes Simulation,” AIAA Journal, Vol. 30, No. 10, 1992, pp.2371–2378.
Strawn, R. C., “Wing-Tip Vortex Calculations with an Unstructured Adaptive-Grid Euler Solver,” Proceedings of the 47th Annual Forum of the American Helicopter Society, American Helicopter Society. 1991, pp.65–76.
Uchiyama, N. and Inoue, O., “Numerical Study of Helicopter Rotor Flowfield,” Proceedings of the Third JSME-KSME Fluids Engineering Conference, Sendai, Japan, 1994, pp.737–741.
Caradonna, F. X. and Tung, C., “Experimental and Analytical Studies of a Model Helicopter Rotor in Hover,” NASA TM-81232, 1981.
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© 1999 Springer Science+Business Media Dordrecht
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Inoue, O., Hattori, Y. (1999). Formation of Vortex Rings in Helicopter Rotor Flow Fields. In: Sørensen, J.N., Hopfinger, E.J., Aubry, N. (eds) IUTAM Symposium on Simulation and Identification of Organized Structures in Flows. Fluid Mechanics and Its Applications, vol 52. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4601-2_27
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DOI: https://doi.org/10.1007/978-94-011-4601-2_27
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5944-2
Online ISBN: 978-94-011-4601-2
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