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Application of non-intrusive optical methods for in-flight flow visualisation

Politz, Christina and Boden, Fritz and Lawson, Nicholas and Casella, Domenico and Kreienfeld, Malte (2009) Application of non-intrusive optical methods for in-flight flow visualisation. 40th Annual Society of Flight Test Engineers International Symposium 2009, 2009-09-07 - 2009-09-11, Linköping and Stockholm (Sweden).

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Official URL: http://symposium.sfte-ec.es/sypa-abstracts.php


The design or modification of an aircraft requires substantial numerical and experimental studies. The outcome of the design process and therefore the definitive quality of the aircraft will be verified during the flight tests for certification. The extrapolation of the data obtained during wind tunnel experiments or at low Reynolds number simulations to real flight conditions is not straight forward and often based on engineering experience or estimations. In terms of measurement techniques, non-intrusive optical image based methods have undergone considerable technological progress during the past decade. The main objective of the European project Advanced In-Flight Measurement Techniques (AIM) is the further development of these optical methods such that they can be routinely applied to flight tests to provide detailed quantitative information on various important parameters e.g. pressure distribution on a wing or density gradient and flow vector fields near airplanes and helicopters. This research project belongs to the 6th European Framework and is funded by the European Commission. One of the applied advanced in-flight measurement techniques is the particle image velocimetry (PIV) method. This mature wind tunnel measurement technique delivers instantaneous flow velocity vector fields with high spatial and temporal accuracy, which can be used to validate numerical simulations. The arrangement of this experimental procedure has been specified and certified for a Dornier DO228 aircraft by the German Aerospace Center (DLR) together with the Cranfield University. The following paper will give a brief overview on the measurement technique PIV and the main challenges such as certifying an airborne class 4 laser system, or the search for suitable seeding, before being able to apply the technique to flight tests. In what follows, the measurement setup and the flight tests will be described. Some of the first results and an outlook on future activities will conclude the paper.

Item URL in elib:https://elib.dlr.de/58327/
Document Type:Conference or Workshop Item (Paper)
Title:Application of non-intrusive optical methods for in-flight flow visualisation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lawson, NicholasCranfield University, GBUNSPECIFIED
Casella, DomenicoCranfield University, GBUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Conference Proceedings
Keywords:in-flight tests; non-intrusive optical methods; AIM; PIV; flow visualisation; laser; aircraft certification
Event Title:40th Annual Society of Flight Test Engineers International Symposium 2009
Event Location:Linköping and Stockholm (Sweden)
Event Type:international Conference
Event Dates:2009-09-07 - 2009-09-11
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
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 of Aerodynamics and Flow Technology > Experimental Methods
Institute of Flight Guidance > ATM-Simulation
Deposited By: Micknaus, Ilka
Deposited On:13 Mar 2009
Last Modified:03 Dec 2009 13:47

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