elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall

He, Guosheng and Siegel, Lars and Henning, Arne and Mulleners, Karen (2019) Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall. The 72nd Annual Meeting of the American Physical Society’s Division of Fluid Dynamics, 23.-26. November 2019, Washington State Convention Center in Seattle, Washington, USA.

[img] PDF
17kB

Official URL: https://www.apsdfd2019.org/

Abstract

The flow around a pitching NACA0015 airfoil with an active trailing-edge flap is investigated using two-dimensional time-resolved particle image velocimetry and surface pressure measurements. The Reynolds number based on the chord length is about 5.5 × 10^5. The airfoil is pitching around the static stall angle of attack of 20° and the flap is either oscillating around the symmetrical plane at β = 0° or fixed at a constant deflection angle. The pitching of the airfoil and the deflection of the flap can be individually controlled in terms of mean angle, oscillating amplitude, frequency and initial phase angle. Below the stall angle, the lift of the static airfoil increases proportionally with the increase of flap deflection angle in the investigated range of −20° ≤ β ≤ 20°. Variations of the phase delay between the oscillations of the main airfoil and the flap lead to a rotation, expansion, or contraction of the dynamic stall lift curves. Higher-order harmonic flap oscillations for the pitching airfoil result in bending or twisting of the lift curves. Quantitative evidence has been extracted from the PIV data to help elucidate the modified aerodynamic characteristics of the pitching airfoil manipulated by the active flap.

Item URL in elib:https://elib.dlr.de/132848/
Document Type:Conference or Workshop Item (Speech)
Title:Role of an active trailing-edge flap of a pitching airfoil undergoing dynamic stall
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
He, Guoshengguosheng.he (at) epfl.chUNSPECIFIED
Siegel, Larslars.siegel (at) dlr.deUNSPECIFIED
Henning, Arnearne.henning (at) dlr.deUNSPECIFIED
Mulleners, Karenkaren.mulleners (at) epfl.chUNSPECIFIED
Date:24 November 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Dynamic stall, active trailing-edge flap, High-speed PIV, lift curves
Event Title:The 72nd Annual Meeting of the American Physical Society’s Division of Fluid Dynamics
Event Location:Washington State Convention Center in Seattle, Washington, USA
Event Type:international Conference
Event Dates:23.-26. November 2019
Organizer:American Physical Society’s Division of Fluid Dynamics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Siegel, Lars
Deposited On:20 Dec 2019 09:41
Last Modified:20 Dec 2019 09:41

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.