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Effect study of design variables on hover performance of long shrouded contra-rotating rotors

Huo, Chao and Barènes, Roger and Gressier, Jérémie Effect study of design variables on hover performance of long shrouded contra-rotating rotors. (2011) In: 46th Symposium of Applied Aerodynamics - Aerodynamics of Rotating Bodies, 28-30 March 2011, Orléans, France . (Unpublished)

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This paper presents a experimental study on the design issues of long shrouded (L/D>1) coaxial propulsion system in hovering. It objects to explore the effects of different design variables, which include: shroud inlet radius and nozzle expansion ratio, rotor locations, rotational speed, rotor number and so on. Through applying the test bench with multiple possibilities of testing parameters and different combinations of shroud inlets and nozzles, the preliminary results show that the diverging nozzle limited by the flow separation and relative greater inlet radius are desired. Based on it, a shroud with a suitable combination of inlet and nozzle is chosen. The experiments on it reveal that: The system with double rotor at the upstream side of cylindrical section and with the second rotational speed higher than the first one performs best; compared to the shroud contribution, increasing rotor number doesn't improve the efficiency greatly.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference without published proceedings
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:05 Sep 2011 14:01

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