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Determination of the NTS-factor for the DNW-NWB

Rohardt, Claas-Hinrik and Küpper, Albert (2014) Determination of the NTS-factor for the DNW-NWB. 19. DGLR-Fach-Symposium der STAB, 4.-5. November 2014, München.

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The Low-Speed Wind Tunnel NWB operated by the foundation German-Dutch Wind Tunnels (DNW) offers as laminar wind tunnel with low turbulence level excellent options to verify the performance parameters of specifically developed laminar airfoils. These airfoils are applied to light weight aircrafts respectively gliders, wind power facilities, etc. After the refurbishment of the NWB to an aero-acoustic wind tunnel in 2009/2010 the commissioning tests turned out that the excellent aerodynamic characteristics of DNW-NWB were kept. Within this framework turbulence levels were checked and a calibration of the wind tunnel concerning the limit-N-factors NTS for Tollmien-Schlichting waves and NQS for crossflow vortices was conducted. To determine the limit-NTS-factor wind tunnel tests with a two-dimensional laminar airfoil were performed. The flow conditions of the boundary layers on the upper and lower side of the airfoil were observed with infrared cameras, so that the location of transition from laminar to turbulent boundary layer could be determined. Additionally the pressure distribution was measured at an intersection line on the surface of the airfoil. The resulting limit-NTS-factor of the wind tunnel was compared with data from free flight tests to get a statement about the validation to transmit measured lift-drag-polars at DNW-NWB to free flight conditions and that the excellent flow quality as laminar wind tunnel was retained over the refurbishment to an aero-acoustic wind tunnel.

Item URL in elib:https://elib.dlr.de/95445/
Document Type:Conference or Workshop Item (Speech)
Title:Determination of the NTS-factor for the DNW-NWB
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rohardt, Claas-Hinrikclaas-hinrik.rohardt (at) dlr.deUNSPECIFIED
Küpper, AlbertAlbert.Kuepper (at) dnw-germany.aeroUNSPECIFIED
Date:4 November 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 72-73
Series Name:Mitteilung zum STAB Jahresbericht
Keywords:N-factor, DNW-NWB, laminar, laminar-turbulent Transition Akustikkanal, Grenz-N-Faktor, laminare Grenzschichtströmung, Transitionslagen
Event Title:19. DGLR-Fach-Symposium der STAB
Event Location:München
Event Type:national Conference
Event Dates:4.-5. November 2014
Organizer:Deutsche Strömungsmechanische Arbeitsgemeinschaft (STAB)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Rohardt, Claas-Hinrik
Deposited On:26 Feb 2015 08:47
Last Modified:26 Feb 2015 08:47

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