Abstract
The dynamic stall behavior of an OA209 rotorcraft airfoil is examined under the influence of a varying incident velocity. Therefore, a harmonic flow velocity variation is added to the pitch motion of the airfoil in antiphase. Results from two-dimensional unsteady RANS computations are presented for steady and periodic flow velocity. The unsteady flow velocity in the computational domain is generated by a fore-aft motion of the airfoil. Both methods are approximations of the flow conditions a blade section of a helicopter rotor experiences during fast forward flight. Finally, the numerical predicted aerodynamic coefficients are used to investigate the modeling capabilities of semi-empirical formulations for a simultaneous angle of attack and incident velocity change.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Beddoes, T.S.: Practical computation of unsteady lift. Vertica 8, 55–71 (1984)
Drela, M.: Two-dimensional transonic aerodynamic design and analysis using the Euler equations. MIT, Gas Turbine Laboratory Report No. 187 (1986)
Edwards, J.R., Chandra, S.: Comparison of eddy viscosity-transport turbulence models for three-dimensional, shock-separated flowfields. AIAA J. 34, 756–763 (1996)
Favier, D., Agnes, A., Barbi, C., Maresca, C.: Combined translation/pitch motion—a new airfoil dynamic stall simulation. J. Aircr. 25, 805–814 (1988)
Favier D., Belleudy, J., Maresca, C.: Influence of coupling incidence and velocity variations on the airfoil dynamic stall. 48th Annual Forum Proceedings—AHS (1992)
Gangwani, S.T.: Prediction of dynamic stall and unsteady airloads for rotor blades. AHS J. 27, 57–64 (1982)
Heinrich, R., Reimer, L.: Comparison of Different Approaches for Gust Modeling in the CFD Code TAU. Proc, IFASD (2013)
Hird, K., Frankhouser, M.W., Gregory, J.W., Bons, J.P.: Compressible dynamic stall of an SSC-A09 airfoil subjected to coupled pitch and freestream mach oscillations. In: 70th Annual Forum Proceedings—AHS (2014)
Johnson, W.: A history of rotorcraft comprehensive analyses. NASA TP-216012 (2012)
Klein, A., Lutz, Th, Krämer, E., Richter, K., Gardner, A.D., Altmikus, A.R.M.: Numerical comparison of dynamic stall for two-dimensional airfoils and an airfoil model in the DNW-TWG. AHS J. 57, 1–13 (2012)
Leishman, J.G., Beddoes, T.S.: A semi-empirical model for dynamic stall. AHS J. 34, 3–17 (1989)
McCroskey, W.J.: The phenomenon of dynamic stall. NASA TM-81264 (1981)
Pierce, G.A., Kunz, D.L., Malone, J.B.: The effect of varying freestream velocity on airfoil dynamic stall characteristics. AHS J. 23, 27–33 (1978)
Richter, K., Le Pape, A., Knopp, T., Costes, M., Gleize, V., Gardner, A.D.: Improved two-dimensional dynamic stall prediction with structured and hybrid numerical methods. AHS J. 56, 1–12 (2011)
Schwamborn, D., Gerhold, T., Heinrich, R.: The DLR TAU-code: recent applications in research and industry, In: Proceedings of European Conference on Computational Fluid Dynamics ECCOMAS CFD (2006)
van der Wall, B.G., Leishman, J.G.: On the influence of time-varying flow velocity on unsteady aerodynamics. AHS J. 39, 25–36 (1994)
Acknowledgments
The present investigations were partly funded in the framework of the LuFo IV project ECO-HC2. The authors would like to thank the Loads and Flight Mechanics department of Airbus Helicopters for the excellent collaboration.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 Springer International Publishing Switzerland
About this paper
Cite this paper
Schicker, D., Hajek, M. (2016). Influence of Periodically Varying Incident Velocity on the Application of Semi-Empirical Dynamic Stall Models. In: Dillmann, A., Heller, G., Krämer, E., Wagner, C., Breitsamter, C. (eds) New Results in Numerical and Experimental Fluid Mechanics X. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 132. Springer, Cham. https://doi.org/10.1007/978-3-319-27279-5_31
Download citation
DOI: https://doi.org/10.1007/978-3-319-27279-5_31
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-27278-8
Online ISBN: 978-3-319-27279-5
eBook Packages: EngineeringEngineering (R0)