Bibliographic Details
| Title: |
The HART II test – measurement of helicopter rotor wakes |
| Alternate Title: |
Der HART II Test – Messung des Nachlaufs von Hubschrauberrotoren |
| Authors: |
van der Wall, Berend G.1 berend.vanderwall@dlr.de, Burley, Casey L.2, Yu, Yung3, Richard, Hugues4, Pengel, Kurt5, Beaumier, Philippe6 |
| Source: |
Aerospace Science & Technology. Jun2004, Vol. 8 Issue 4, p273-284. 12p. |
| Subjects: |
Fluid dynamic measurements, Rotors (Helicopters), Aerofoils, Aeronautics |
| Abstract (English): |
A key parameter to reduce rotor noise is a wake location relative to a blade. During the data analysis in the years after the HART test of 1994 it was found that comprehensive wake data are needed to understand wake development, vortex creation and aging, their motion and their re-development after an interaction with a rotor blade. Therefore, DLR, ONERA, NASA Langley, US Army AFDD and DNW again came together and generated a follow-on program named HART II. In this program the rotor wake was intensively measured with a novel double-stereo PIV (Particle Image Velocimetry) system. This provides instantaneous flow field data in both a large observation area and in a smaller close-up view to the vortex core. Additionally, rotor blade deformation, airloads, and noise radiation were measured to form a complete, consistent, and comprehensive data base. Another “first time” was the application of the blade position measurement technique SPR (Stereo Pattern Recognition), which provided instantaneous optical measurement of the blade bending in flap, lead-lag and torsion. In this paper, the HART II test is described in detail, including a description of all measurement techniques applied and with some results from each of them. [Copyright &y& Elsevier] |
| Abstract (German): |
Ein wesentlicher Parameter zur Reduktion des Rotorla¨rms ist die Lage des Rotornachlaufes relativ zu den Rotorbla¨ttern. Die Analyse der HART Daten von 1994 zeigte, dass vor allem detaillierte, ra¨umliche Daten des Rotornachlaufes fehlten. Daher hatten die an HART beteiligten Organisationen – DLR, ONERA, NASA Langley, US Army AFDD und DNW – ein Nachfolgeprogramm durchgefu¨hrt (HART II), das im Wesentlichen auf die Vermessung des Rotornachlaufes zielte. Als Messmethode kam 3C-PIV (Particle Image Velocimetry) in Anwendung, wobei zwei unabha¨ngige Systeme mit verschiedener Auflo¨sung zum Einsatz kamen. Dies lieferte das momentane Stro¨mungsfeld aller drei Geschwindigkeitskomponenten in einer Ebene. Zusa¨tzlich wurden die Rotorkra¨fte, Druckverteilungen an den Rotorbla¨ttern sowie die La¨rmemissionen gemessen, um eine umfassende, konsistente Datenbasis zu erhalten. Neben der erstmaligen Anwendung von 3C-PIV an einem Rotor wurde zum erstenmal die Blattposition optisch mit Hilfe der SPR (Stereo Pattern Recognition) Methode erfasst, um die elastische Deformation der Rotorbla¨tter in allen Freiheitsgraden zu bestimmen. In diesem Artikel wird der HART II Test, alle verwendeten Messtechniken sowie einige Ergebnisse pra¨sentiert. [Copyright 2004 Elsevier] |
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| Database: |
Engineering Source |
