A Comparison of the Acoustic and Aerodynamic Measurements of a Model Rotor Tested in Two Anecholic Wind Tunnels

Two aeroacoustic facilities--the CEPRA 19 in France and the DNW in the Netherlands--are compared. The two facilities have unique acoustic characterists that make them appropriate for acoustic testing of model-scale helicopter rotors. An identical pressure-instrumented model-scale rotor was tested in...

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Bibliographic Details
Main Authors: Boxwell, D A, Schmitz, F H, Splettstoesser, W R, Schultz, K J, Lewy, S
Format: Report
Language:English
Subjects:
ACOUSTIC COATINGS
ACOUSTIC MEASUREMENT
ACOUSTIC PROPERTIES
ACOUSTIC SIGNATURES
Acoustics
AEROACOUSTICS
AERODYNAMIC CHARACTERISTICS
AERODYNAMICS
BLADES
FLOW
FRANCE
GEOMETRY
HELICOPTER ROTORS
INSTRUMENTATION
Jet and Gas Turbine Engines
NETHERLANDS
PRESSURE
ROTOR BLADES(TURBOMACHINERY)
SCALE MODELS
SOUND TRANSMISSION
SURFACE PROPERTIES
Test Facilities, Equipment and Methods
TEST METHODS
VELOCITY
WIND TUNNELS
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Summary:Two aeroacoustic facilities--the CEPRA 19 in France and the DNW in the Netherlands--are compared. The two facilities have unique acoustic characterists that make them appropriate for acoustic testing of model-scale helicopter rotors. An identical pressure-instrumented model-scale rotor was tested in each facility and acoustic test results are compared with full-scale rotor test results. Blade surface pressures measured in both tunnels were used to correlate nominal rotor operating conditions in each tunnel, and also used to assess the steadiness of the rotor in each tunnel's flow. In-the-flow rotor acoustic signatures at moderate forward speeds (35-50 m/sec) are presented for each facility and discussed in relation to the differences in tunnel geometries and aeroacoustic characteristics. Keywords: Acoustics; Anechoic wind tunnels; Model helicopter rotors; Blade pressures. See also Part 1, ADA171541.