NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Unsteady blade pressure measurements on a model counterrotation propellerIn an exploratory effort an advanced counterrotation propeller instrumented with blade-mounted pressure transducers was tested in the NASA Lewis 9- by 15-Foot Anechoic Wind Tunnel at a simulated takeoff and landing speed of Mach 0.20. The propeller's aft diameter was reduced to investigate possible noise reductions resulting from reduced blade row interaction with the tip vortex. The propeller was tested at three blade row spacings at fixed blade setting angles, at the maximum blade row spacing at higher blade setting angles and at propeller axis angles attack to the flow up to + or - 16 deg. A limited number of unsteady blade surface pressure measurements were made on both rotors of the model counterrotation propeller. Emphasis was placed on determining the effects of rotor-rotor interactions on the blade surface pressures. A unique method of processing the pressure signals was developed that enables even weak interaction waveforms and spectra to be separated from the total signal. The interaction on the aft rotor was many times stronger than that on the forward rotor. The fundamental rotor interaction tone exhibited complicated behavior but generally increased with rotational speed and blade setting angle and decreased with rotor spacing. With the propeller axis at an angle to the flow, the phase response of the aft rotor appeared to be significantly affected by the presence of the forward rotor.
Document ID
19890011408
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Heidelberg, Laurence J.
(NASA Lewis Research Center Cleveland, OH, United States)
Woodward, Richard P.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1989
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 89-1144
NASA-TM-102002
NAS 1.15:102002
E-4684
Meeting Information
Meeting: Aeroacoustics Conference
Location: San Antonio, TX
Country: United States
Start Date: April 10, 1989
End Date: April 12, 1989
Sponsors: inpart by AIAA
Accession Number
89N20779
Funding Number(s)
PROJECT: RTOP 535-03-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available