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Investigation of Unsteady Flow Phenomena in a Counterrotating Ducted Propfan FREE

[+] Author Affiliations
L. Wallscheid, F. Eulitz, R. Heinecke

Deutsches Zentrum für Luft- and Raumfahrt, Cologne, Germany

Paper No. 98-GT-251, pp. V001T01A066; 13 pages
doi:10.1115/98-GT-251
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 1: Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7862-0
  • Copyright © 1998 by ASME

abstract

Experimental and numerical investigations on a counterrotating propfan (CRISP) have been carried out to study unsteady flow phenomena generated by the interaction of the two rotors. This paper focuses mainly on the downstream effects of rotor 1 on rotor 2. Therefore unsteady Laser-2-Focus, unsteady total pressure measurements and an unsteady simulation have been carried out. The total pressure measurements behind the rotors show variations of the absolute total pressure outside the wake regions up to 30 percent of the average total pressure rise. Some of these are caused by the interaction of the rotor 1-generated wakes with the leading edge of rotor 2. The others may result from the pressure waves generated by the reflection of the rotor 2-shockwaves by the blades of rotor 1.

Copyright © 1998 by ASME
Topics: Unsteady flow
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