A NOVEL POTENTIAL/VISCOUS FLOW COUPLING TECHNIQUE FOR COMPUTING HELICOPTER FLOW FIELDS

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 10396
Amount: $1,492,497.00
Phase: Phase II
Program: SBIR
Awards Year: 1990
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Analytical Methods Inc.
2133-152nd Ave Ne, Redmond, WA, 98052
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr J Michael Summa
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
BECAUSE OF THE COMPLEXITY OF THE HELICOPTER FLOW FIELD, A ZONAL METHOD OF ANALYSIS OF COMPUTATIONAL AERODYNAMICS IS REQUIRED. IN THIS RESEARCH, A NEW PROCEDURE FOR COUPLING POTENTIAL AND VISCOUS FLOW CALCULATION SCHEMES IS PROPOSED. AN OVER-LAPPING, VELOCITY-COUPLING TECHNIQUE IS TO BE DEVELOPED WITH THE UNIQUE FEATURE THAT THE POTENTIAL FLOW SURFACE SINGULARITY STRENGTHS ARE OBTAINED DIRECTLY FROM THE NAVIER-STOKES SOLUTION AT A SMOOTHER INNER FLUID BOUNDARY. THE CLOSED-LOOP INTERATION METHOD PROCEEDS UNTIL THE VELOCITY FIELD IS CONVERGED. THIS COUPLING SHOULD PROVIDE THE MEANS OF MORE ACCURATE VISCOUS COMPUTATIONS OF THE NEAR-BODY AND ROTOR FLOW FIELDS WITH RESULTANT IMPROVED ANALYSIS OF SUCH IMPORTANT PERFORMANCE PARAMETERS AS HELICOPTER FUSELAGE DRAG AND ROTOR AIRLOADS.

* information listed above is at the time of submission.

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