Numerical Comparison of Dynamic Stall for Two-Dimensional Airfoils and an Airfoil Model in the DNW–TWG
Klein, A. and Lutz, T. and Krämer, E. and Richter, Kai and Gardner, Anthony Donald and Altmikus, A.R.M. (2012) Numerical Comparison of Dynamic Stall for Two-Dimensional Airfoils and an Airfoil Model in the DNW–TWG. Journal of the American Helicopter Society, Vol. 57 (4), pp. 1-13. AHS International. DOI: 10.4050/JAHS.57.042007.
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Official URL: http://dx.doi.org/10.4050/JAHS.57.042007
The airfoil sections of helicopter rotors experience a wide range of flow conditions in forward flight from transonic flow on the advancing blade to subsonic flow and high angles of attack on the retreating blade. Most notably, the dynamic stall phenomenon has been a research topic for decades and various models have been introduced to predict the unsteady characteristics of the rotor blade undergoing unsteady separation. The objective of the present paper is to compare two dimensional (2D) dynamic stall computations, suitable for airfoil design studies considering unsteady characteristics, with computational fluid dynamics simulations of the wind tunnel environment taking into account three dimensionality and wall effects. Differences between experiment and 2D computations can be partly attributed to sidewall effects, which alter the effective angle of attack at the midsection pressure measurement plane. To gain more insight into these effects, investigations are presented, which show the wind tunnel wall boundary layers and separation effects at the sidewall–airfoil junction.
|Title:||Numerical Comparison of Dynamic Stall for Two-Dimensional Airfoils and an Airfoil Model in the DNW–TWG|
|Journal or Publication Title:||Journal of the American Helicopter Society|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1-13|
|Keywords:||Dynamic Stall, helicopter, wind tunnel interference, Mach 0.3, EDI-M109, INROS, DNW-TWG, FLOWer|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L RR - Rotorcraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L RR - Rotorcraft Research|
|DLR - Research theme (Project):||L - The Virtual Aerodynamic Rotorcraft|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Helicopters|
|Deposited By:||Dr. Anthony Gardner|
|Deposited On:||22 Oct 2012 16:35|
|Last Modified:||26 Mar 2013 13:42|
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