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BLADE Flight Test Instrumentation for Transition Detection

Koch, Stefan and Mühlmann, Philipp and Lefebvre-Albaret, François and Mouchet, Benjamin and Reulet, Philippe (2020) BLADE Flight Test Instrumentation for Transition Detection. Aerospace Europe Conference AEC2020, 2020-02-25 - 2020-02-28, Bordeaux, Frankreich.

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Official URL: https://aerospace-europe2020.eu/


'Clean Sky' is the biggest European research program that develops innovative breakthrough technologies for a future aircraft, which aim on CO2 reduction, decrease of emission and noise reduction. In the work package 'Natural Laminar Flow (NLF) Smart Wing with associated Advanced Flight Test Instrumentation' flight tests are performed on the 'Breakthrough Laminar Aircraft Demonstrator in Europe' (BLADE, Airbus A340), to pave the way for laminar wings on future commercial aircrafts. In order to measure the boundary layer status (laminar/turbulent) on the aircraft’s wing, the German Aerospace Center (DLR) used a planar imaging method (infra-red thermography) on the one hand, and a fast local measurement technique (hot-film anemometry) on the other hand. The technical challenges to use those measurement techniques were enormous and were realised by DLR in cooperation with Airbus on the A340 BLADE aircraft. During the pre-flight phase, ONERA has assessed the capability to use sun illumination for IR transition detection, based on an aerothermal model of the wing under flight conditions. An extensive flight test program helped to gather knowledge about the possibilities to establish a transport aircraft with laminar wings. The infra-red measurement system was able to detect the transition line on both wings with a remarkable spatial resolution. The presentation will describe how the IR-setup was engineered for the special situation of two vertical tail mounted IR-cameras together with a special calibration procedure and software development. The hot-film sensors measured the boundary layer status at the leading edge within smallest boundary layer thicknesses without biasing the transitional process. Moreover additional hot-film sensors were used to verify other transition measurement systems and gathered high frequency information from the boundary layer behind surface irregularities. The paper will describe the hot-film setup and installation for the special situation of thin boundary layers at the leading edge. Exemplary data from hot-film measurements as well as from transition measurements with the IR-system will be shown.

Item URL in elib:https://elib.dlr.de/134177/
Document Type:Conference or Workshop Item (Speech)
Title:BLADE Flight Test Instrumentation for Transition Detection
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:25 February 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Clean Sky, BLADE, transport aircraft, laminar wings, infra-red thermography, hot-film anemometry
Event Title:Aerospace Europe Conference AEC2020
Event Location:Bordeaux, Frankreich
Event Type:international Conference
Event Start Date:25 February 2020
Event End Date:28 February 2020
Organizer:3AF und CEAS
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 - Flight Physics (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Koch, Dr.rer.nat. Stefan
Deposited On:17 Mar 2020 17:37
Last Modified:24 Apr 2024 20:37

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