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Titel:

Investigation of the Unsteady Reverse Flow Airloads at High Advance Ratios

Autor(en): G. Bowen-Davies, I. Chopra
Zusammenfassung: The comprehensive analysis UMARC has been modified to include a model for dynamic stall in the reverse flow region for high advance ratio helicopter. The reverse flow stall model adapts the Leishman-Beddoes dynamic stall model with concepts from a flat plate in accelerating flow. The model is evaluated against airloads data from the reverse flow region of the UH-60A slowed rotor test at high advance ratios between µ = 0.4?1.0. The dynamic stall model predicts dynamic stall in the reverse flow for all the test cases, but does not have a significant impact on the advancing side of the rotor. At lower advance ratios (µ = 0.4 and 0.6), the azimuth of dynamic stall is well predicted and the correlation with the measured airloads in the reverse flow is improved. At µ = 1.0, the model predicts multiple vortex shedding, which are present in the test, but the phase agreement is not satisfactory.
Veranstaltung: 41th European Rotorcraft Forum 2015
Sprache: englisch
Veröffentlicht: DGLR-Bericht, 2016, 2016-01, 41st European Rotorcraft Forum 2015; S.-; 2016; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn
Preis: NA
ISBN:
ISSN:
Kommentar:
Klassifikation:
Stichworte zum Inhalt: aerodynamic loads;aerodynamic stalling;azimuth;flat plates;helicopters;rotors;vortex shedding
Verfügbarkeit: Bestellbar
Veröffentlicht: 2016


Dieses Dokument ist Teil einer übergeordneten Publikation:
41st European Rotorcraft Forum 2015