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Influence of rotation on dynamic stall

Gardner, Anthony Donald and Richter, Kai (2012) Influence of rotation on dynamic stall. Curran Associaties, Inc.. American Helicopter Society 68th Annual Forum, 01. - 03. May 2012, Fort Worth, Texas, USA. ISBN 978-1-62276-051-0.

Full text not available from this repository.

Official URL: http://www.proceedings.com/15008.html

Abstract

A computational investigation of the effect of rotation on two dimensional deep dynamic stall has been undertaken, showing that the effect of rotation is to reduce the severity of the pitching moment peak and cause earlier reattachment of the flow. A generic single blade rotor geometry was investigated, which had a pitching oscillation around the quarter-chord axis while in hover, causing angle-driven dynamic stall. The results at the mid-point of the blade have the same Mach number (0.31), Reynolds number (1.15e6) and pitching motion alpha=13°plusminus7°) as the DS2 dynamic stall test case for which significant experimental wind tunnel data and 2D computations exist. The rotating blade is compared with 2D computations, and computations using the same blade without rotation at Mach 0.31 and with the same pitching motion. All test cases involve geometries propagating into undisturbed flow with no downwash. The 3D grid computed without rotation had lower lift at the reference section than for a 2D computation, and the lift overshoot classically observed for Spalart-Allmaras turbulence models during 2D dynamic stall was not present in the 3D case. Rotation reduced the strength of the dynamic stall vortex, which reduced the accompanying pitching moment peak by 25%.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Forum 68 Special Sessions Briefings CD - Fort Worth, TX 2012
Title:Influence of rotation on dynamic stall
Authors:
AuthorsInstitution or Email of Authors
Gardner, Anthony DonaldUNSPECIFIED
Richter, KaiUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Proceedings of a meeting held 1-3 May 2012, Fort Worth, Texas, USA. Vertical Flight Technical Society
Page Range:pp. 464-474
Publisher:Curran Associaties, Inc.
Series Name:68th American Helicopter Society International Annual Forum 2012
ISBN:978-1-62276-051-0
Status:Published
Keywords:dynamic stall, rotor, blade, helicopter, aerodynamics, DLR-TAU, CFD, URANS, Spalart-Allmaras, chimera, SIMCOS
Event Title:American Helicopter Society 68th Annual Forum
Event Location:Fort Worth, Texas, USA
Event Type:international Conference
Event Dates:01. - 03. May 2012
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: Dr. Anthony Gardner
Deposited On:16 Jul 2012 15:55
Last Modified:20 Aug 2012 14:54

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