AEROACOUSTIC ANALYSIS OF ROTOR/ROTOR WAKE INTERACTIONS

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$499,390.00
Award Year:
1991
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
11946
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Continuum Dynamics, Inc.
P.o. Box 3073, Princeton, NJ, 08543
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Alan J. Bilanin
Senior Associate
(609) 734-9282
Business Contact:
ALAN J. BILANIN
PRESIDENT
(609) 734-9282
Research Institution:
n/a
Abstract
THE IMPORTANCE OF REDUCING THE NOISE EMITTED BY HELICOPTER ROTORS HAS BEEN WIDELY RECOGNIZED FOR MANY YEARS. PREVIOUS WORK BY CONTINUUM DYNAMICS IN THE ANALYSIS OF ROTOR AEROACOUSTICS LED TO THE DEVELOPMENT OF AN EFFICIENT AND ACCURATE LAGRANGIAN SIMULATION OF THE UNSTEADY VORTICITY FIELD IN THE VICINITY OF HELICOPTER MAIN ROTOR THAT COULD SERVE AS THE FOUNDATION FOR A GENERAL ANALYSIS OF THE NOISE GENERATED BY MAIN-ROTOR-WAKE/TAIL-ROTOR INTERACTIONS. THE MAIN-ROTOR/TAIL-ROTOR SIMULATION DEVELOPED PREVIOUSLY, THOUGH, WAS DESIGNED AS A TECHNOLOGY DEMONSTRATION FOR APPLICATION TO A LIMITED CLASS OF INTERACTIONS; WHILE THE RESULTS TO DATE HAVE BEEN QUITE PROMISING, THE CURRENT CAPABILITIES OF THE ANALYSIS MUST BE CONSIDERABLY ENHANCED BEFORE IT CAN BECOME A GENERALLY APPLICABLE TOOL FOR THE PREDICTION OF HELICOPTER ROTOR NOISE. THE OVERALL OBJECTIVE OF THE EFFORT PROPOSED HERE IS TO DEMONSTRATE TECHNIQUES FOR GENERALIZING THE EXISTING ANALYSIS SO IT CAN ADDRESS BROAD CLASSES OF ROTOR-WAKE/ROTOR INTERACTION PHENOMENA, PARTICULARLY THOSE THAT FIGURE IN MAIN ROTOR NOISE GENERATION. THE PRESENT PROPOSAL PRESENTS THE DETAILSOF THESE ENHANCEMENTS, WHICH FOCUS ON THE EXPANSION OF THE RECONSTRUCTION PROGRAM DEVELOPED IN THE PREVIOUS EFFORT TO HANDLE ARBITRARY VORTEX WAKE INTERSECTIONS OF THREE-DIMENSIONAL REGIONS AROUND OR NEAR MAIN ROTORS, THE DEVELOPMENT OF NEW NEARFIELD VELOCITY CORRECTIONS FOR SUCH INTERACTIONS, AND PRELIMINARY STUDY OF METHODS FOR USING THE NEW HIGH-RESOLUTION FLOW FIELD ANALYSIS FOR ACOUSTIC PREDICTIONS.

* information listed above is at the time of submission.

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