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Numerical investigation of boundary layer separation over an airfoil during dynamic stall

Jeon, Sang Eon and Park, Soo Hyung and Byun, Yung Hwan and Richter, Kai and Geissler, Wolfgang (2012) Numerical investigation of boundary layer separation over an airfoil during dynamic stall. European Rotorcraft Forum 2012, 4.-6. Sept. 2012, Amsterdam, Niederland.

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Official URL: http://erf2012.nlr.nl/index.html

Abstract

Boundary-layer separations appearing on an oscillating airfoil are investigated to understand the onset process of dynamic stall phenomena. Dynamic stall predictions are performed using a time-accurate NavierStokes solver coupled with the transition-transport equations of Langtry and Menter. The effects of the reduced frequency and the Mach number on the generation of separation bubbles are compared based on a parametric study. Four types of boundary-layer separations are observed over the OA209 airfoil: the laminar separation bubble, shock-induced separation, trailing edge separation, and an unsteady separation related to the dynamic stall vortex. Numerical results show that the appearance of the dynamic stall vortex is not directly related to the existence of the leading edge separations. The presence of the dynamic stall vortex and the resulting lift overshoot are strongly correlated with the reduced frequency of the oscillation.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Numerical investigation of boundary layer separation over an airfoil during dynamic stall
Authors:
AuthorsInstitution or Email of Authors
Jeon, Sang EonKonkuk University, Seoul, South Korea
Park, Soo HyungKonkuk University, Seoul, South Korea
Byun, Yung HwanKonkuk University, Seoul, South Korea
Richter, KaiUNSPECIFIED
Geissler, WolfgangUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-9
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:dynamic stall, OA209 airfoil, laminar separation bubble, shock-induced separation, trailing edge separation, dynamic stall vortex
Event Title:European Rotorcraft Forum 2012
Event Location:Amsterdam, Niederland
Event Type:international Conference
Event Dates:4.-6. Sept. 2012
Organizer:Netherlands Association of Aeronautical Engineers (NVvL)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Elisabeth Winkels
Deposited On:12 Sep 2012 14:16
Last Modified:18 Sep 2012 09:14

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