A ZONAL METHOD FOR MODELING POWERED-LIFT AIRCRAFT FLOW FIELDS

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$50,000.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
16875
Agency Tracking Number:
16875
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3055 112th Ave Ne #208, Bellevue, WA, 98004
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
ADVANCED SHORT TAKEOFF/VERTICAL LANDING AIRCRAFT ARE DESIGNED TO USE EXHAUST JETS DIRECTLY TO INCREASE LIFT. BEING ABLE TO MODEL NUMERICALLY THE FLOW FIELDS INVOLVED IN THESE DESIGNS WOULD GREATLY IMPROVE THE DESIGN PROCESS. THIS PROJECT WILL DEVELOP A COST-EFFECTIVE FLOW ANALYSIS TOOL FOR MODELING POWERED-LIFT AIRCRAFT FLOW FIELDS. A KEY INGREDIENT IN THE DEVELOPMENT OF A PRACTICAL FLOW ANALYSIS IS THE TURBULENCE MODEL. THE PHASE I OBJECTIVE IS TO DEVELOP AND VALIDATE A TURBULENCE MODEL THAT WILL ACCURATELYAND EFFICIENTLY MODEL THE TURBULENCE PHENOMENA IN FLOWS WITHTHE STRONG CURVATURE ENCOUNTERED IN POWERED-LIFT FLOWS. A TWO-EQUATION MODEL COUPLED TO AN ALGEBRAIC REYNOLDS STRESS MODEL WILL BE INVESTIGATED IN THE CONTEXT OF A THREE-DIMENSIONAL NAVIER-STOKES CODE. A SUB-GRID-SCALE MODEL WILL ALSO BE EXAMINED. THE MODELS WILL BE TESTED BY CALCULATING A JET IN GROUND EFFECT WITH A CROSSFLOW WITH PARTICULAR ATTENTION ON THE GROUND VORTEX. ADVANCED SHORT TAKEOFF/VERTICAL LANDING AIRCRAFT ARE DESIGNED TO USE EXHAUST JETS DIRECTLY TO INCREASE LIFT. BEING ABLE TO MODEL NUMERICALLY THE FLOW FIELDS INVOLVED IN THESE DESIGNS WOULD GREATLY IMPROVE THE DESIGN PROCESS. THIS PROJECT WILL DEVELOP A COST-EFFECTIVE FLOW ANALYSIS TOOL FOR MODELING POWERED-LIFT AIRCRAFT FLOW FIELDS. A KEY INGREDIENT IN THE DEVELOPMENT OF A PRACTICAL FLOW ANALYSIS IS THE TURBULENCE MODEL. THE PHASE I OBJECTIVE IS TO DEVELOP AND VALIDATE A TURBULENCE MODEL THAT WILL ACCURATELYAND EFFICIENTLY MODEL THE TURBULENCE PHENOMENA IN FLOWS WITHTHE STRONG CURVATURE ENCOUNTERED IN POWERED-LIFT FLOWS. A TWO-EQUATION MODEL COUPLED TO AN ALGEBRAIC REYNOLDS STRESS MODEL WILL BE INVESTIGATED IN THE CONTEXT OF A THREE-DIMENSIONAL NAVIER-STOKES CODE. A SUB-GRID-SCALE MODEL WILL ALSO BE EXAMINED. THE MODELS WILL BE TESTED BY CALCULATING A JET IN GROUND EFFECT WITH A CROSSFLOW WITH PARTICULAR ATTENTION ON THE GROUND VORTEX.

* information listed above is at the time of submission.

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