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Joint ONERA-DLR PSP measurements for unsteady characterization and future activities

Klein, Christian und Mérienne, Marie-Claire und Sachs, Werner und Le Sant, Yves (2006) Joint ONERA-DLR PSP measurements for unsteady characterization and future activities. MOTAR - Meeting / Measurement and Observation Techniques for Aerospace Research / Chapter 1 - Advanced Measuring Techniques, 2006-04-06 - 2006-04-07, Berlin Germany.

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Kurzfassung

Application of the PSP technique to unsteady aerodynamic flows requires specific measurement instrumentation. First of all, a dedicated paint as pressure sensor has to be designed in order to reduce the response time of the paint. Then, the instrumentation has to be able to acquire with high framing rate low light level intensities. Concerning the paint formulation, DLR has developed a high porosity paint where the luminescent dye is incorporated in a porous polymer. ONERA is working on a surface contact paint (anodized-aluminium PSP) where the dye is adsorbed on porous anodized-aluminium. The dynamic calibration of the unsteady paint (uPSP) consists in measuring the response of the paint under pressure variations. The calibration rig can generate either a pressure step, like in a shock tube or by opening a quick valve, or a periodic pressure variation. In this case, the frequency is limited to a maximum of 1 kHz. Above this value, the amplitude of pressure variations is too low. On the other hand, the shock tube can generate high pressure variations. Common measurements have been performed at ONERA with the DLR paint under sinusoidal pressure variations between 50 and 100Hz with amplitude of several thousands of Pascals. The aim of the test was to define a common procedure for unsteady PSP calibration. The response time of the high porosity paint is almost 10 ms, while the anodized-aluminium PSP has a response time of several tens of microseconds. The advantage of the DLR paint is that it can be spayed on any surface while the ONERA coating can be applied only on aluminium. Point-wise measurement systems coupled with a PMT is commonly used for calibration because they have high acquisition rate. Now, CMOS cameras allow high frame rate acquisition associated to high sensitivity. This type of camera has been recently purchased at ONERA. Wind tunnel tests are planned at DLR on a forced oscillating wing in 2006. Then, buffeting measurements should be performed in 2007. ONERA will repeat measurements, previously made in 2003, on a forced oscillating shock with the high speed camera instead of point-wise system.

Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:24 Folien
Titel:Joint ONERA-DLR PSP measurements for unsteady characterization and future activities
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Klein, ChristianNICHT SPEZIFIZIERT
Mérienne, Marie-ClaireONERA, France
Sachs, WernerNICHT SPEZIFIZIERT
Le Sant, YvesONERA, France
Datum:2006
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Name der Reihe:CD-ROM Minutes of the DLR/ONERA Meeting
Status:veröffentlicht
Stichwörter:Unsteady PSP, porous polymer, anodized-aluminium PSP, response time, dynamic calibration, unsteady PSP calibration
Veranstaltungstitel:MOTAR - Meeting / Measurement and Observation Techniques for Aerospace Research / Chapter 1 - Advanced Measuring Techniques
Veranstaltungsort:Berlin Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-04-06 - 2006-04-07
Veranstalter :DLR/ONERA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:13 Nov 2006
Letzte Änderung:27 Apr 2009 13:13

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