Takeoff/approach noise for a model counterrotation propeller with a forward-swept upstream rotorA scale model of a counterrotating propeller with forward-swept blades in the forward rotor and aft-swept blades in the aft rotor (designated F39/A31) has been tested in the NASA Lewis 9- by 15-Foot Anechoic Wind Tunnel. This paper presents aeroacoustic results at a takeoff/approach condition of Mach 0.20. Laser Doppler Velocimeter results taken in a plane between the two rotors are also included to quantify the interaction flow field. The intention of the forward-swept design is to reduce the magnitude of the forward rotor tip vortex and/or wakes which impinge on the aft rotor, thus lowering the interaction tone levels.
Document ID
19930040785
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Woodward, Richard P. (NASA Lewis Research Center Cleveland, OH, United States)
Hall, David G. (Sverdrup Technology, Inc. Brook Park, OH, United States)
Podboy, Gary G. (NASA Lewis Research Center Cleveland, OH, United States)
Jeracki, Robert J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
AIAA PAPER 93-0596
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit