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Influence of rotation on dynamic stall

Gardner, Anthony Donald and Richter, Kai (2013) Influence of rotation on dynamic stall. Journal of the American Helicopter Society, Vol. 58 (3), pp. 1-9. American Helicopter Society. DOI: 10.4050/JAHS.58.032001 ISSN 0002-8711

Full text not available from this repository.

Official URL: http://dx.doi.org/10.4050/JAHS.58.032001

Abstract

A computational investigation of the effect of rotation on two-dimensional (2D) 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 midpoint of the blade have the same Mach number (0.31), Reynolds number (1.15×106), and pitching motion (α =13◦±7◦) as a 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 three-dimensional (3D) grid computed without rotation had lower lift at the reference section than for a 2D computation with the same geometric angle of attack time history, and the lift overshoot classically observed for Spalart–Allmaras turbulence models during 2D dynamic stall was significantly reduced in the 3D case. Rotation reduced the strength of the dynamic stall vortex, which reduced the accompanying pitching moment peak by 25%.

Item URL in elib:https://elib.dlr.de/83622/
Document Type:Article
Title:Influence of rotation on dynamic stall
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gardner, Anthony Donaldtony.gardner (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Date:July 2013
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 58
DOI :10.4050/JAHS.58.032001
Page Range:pp. 1-9
Publisher:American Helicopter Society
ISSN:0002-8711
Status:Published
Keywords:dynamic stall, TAU, CFD, 3D, 2D, Aerodynamics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Gardner, Dr.habil. Anthony
Deposited On:20 Aug 2013 10:37
Last Modified:08 Mar 2018 18:45

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