Award Data

IN RECENT YEARS, THE TURBOPROP PROPULSION SYSTEM HAS RECEIVED INCREASING INTEREST DUE TO THE SUBSTANTIAL SAVINGS THAT CAN BE ACHIEVED IN FUEL CONSUMPTION. SUBSTANTIAL RESOURCES. HAVE BEEN INVESTED IN DEVELOPING NEW TECHNOLOGIES FOR AERODYNAMIC DESIGN, AEROACOUSTIC PERFORMANCE, AERODYNAMIC STRUCTURAL DESIGN, POWER GENERATION AND POWER TRANSMISSION. IN PROPELLER DESIGN, PREDICTION CODES ARE AVAILABL ...

IT IS GENERALLY AGREED THAT THE BURSTING PHENOMENON IS THE MOST SIGNIFICANT DYNAMIC EVENT IN A TURBULENT BOUNDARY LAYER. ABOUT 80% OF THE MOMENTUM TRANSFER OCCURS DURING THESE BURSTS. TO REDUCE VISCOUS DRAG, THE PHYSICS AND STRUCTURE OF THESE EVENTS MUST BE FULLY UNDERSTOOD. HOWEVER, PREVIOUS ATTEMPTS TO ACCOMPLISH THIS HAVE BEEN FRUSTRATED BY THE FACT THAT BURSTS OCCUR RANDOMLY IN TIME AND SPACE. ...

CRYOCOOLERS AND GAS LIQUEFIERS UTILIZE ISENTHALPIC EXPANSION OF COOLED GAS IN JOULE-THOMSON NOZZLES. TO EFFECTIVELY OPTIMIZE USAGE OF THE COMPRESSED GAS, A VARIABLE GAS MASS FLOW RATE IS NECESSARY. A HIGH FLOW RATE IS REQUIRED INITIALLY WITH A PROGRESSIVE REDUCTION AS THE DESIGN CONDITION IS ATTAINED AND INTERMITTENT FLOW THEREAFTER DEPENDING ON THE LOAD DEMAND. THIS PROJECT INCORPORATES INNOVATIV ...

A NUMBER OF LOW GRAVITY MATERIALS PROCESSING EXPERIMENTS SUCH AS CRYSTAL GROWTH STUDIES REQUIRE A SPECIALIZED OPTICAL SYSTEM CAPABLE OF FLOW VISUALIZATION. SEVERAL SUCH SYSTEMS HAVE BEEN BUILT FOR USE IN SPACE AND BALLISTIC AIRCRAFT FLIGHTS, INCLUDING SCHLIEREN SYSTEMS. HOWEVER, NO COLOR SCHLIEREN SYSTEM HAS BEEN DEVELOPED FOR THESE APPLICATIONS. A COLOR SCHLIEREN SYSTEM PRODUCES DATA MORE AMENABL ...

A NEW CAPABILITY FOR THE PREDICTION OF AERODYNAMIC CHARACTERISITIC OF POWERED-LIFT VEHICLES IS THE GOAL OF THISPROJECT. A PRESENTLY AVAILABLE AERODYNAMIC ANALYSIS COMPUTERCODE, VSAERO, IS APPLICABLE TO POWERED-LIFT AIRCRAFT CONFIGURATIONS. THE PROGRAM INCLUDES A METHOD WHICH CAN TREAT THE DIFFICULT GEOMETRIC SHAPES ASSOCIATED WITH SUCH CONFIGURATIONS AND HAS COUPLED ITERATIVE ROUTINES FOR VISCOUS/ ...

SUBSONIC AND TRANSONIC AERODYNAMIC ANALYSIS PROCEDURES HAVE BEEN DEVELOPED FOR APPLICATION TO CIRCULATION CONTROL AIRFOILS. WHILE THESE METHODS PERFORM WELL IN COMPARISON WITH EXPERIMENTS FOR LOW BLOWING COEFFICIENTS, AT HIGH BLOWING COEFFICIENTS, WITH THE NOZZLES CHOKED AND PRODUCING UNDEREXPANDED SUPERSONIC JETS, THE RESULTING SHOCK CELL STRUCTURE CANNOT BE PREDICTED BY THE PRESENT ANALYSES. A S ...

IN ORDER TO ESTIMATE THE PERFORMANCE OF MODELS TESTED IN TRASONIC WIND TUNNELS, AND TO ACHIEVE MAXIUM BENEFIT FROM SUCH TEST, IT IS NECESSARY TO MAKE ACCURATE CORRECTIONS FOR EFFECTS OF WALL INTERFERENCE. AND IMPROVED CONCEPT FOR THE ASSESMENT AND CORRECTION OF WALL INTERFERENCE IN TRASONIC TUNNELS IS THE FOCUS OF THIS PROJECT. UNTIL RECENTLY, THE ONLY AVAILABLE ANALYSIS OF INTERFERENCE WAS A CLAS ...

THE ANALYSIS OF AIRCRAFT AND HELICOPTER PROPULSION SYSTEM SUCH AS COMPRESSORS, GAS TURBINES, PROPELLERS AND ROTORS REQUIRES THE USE OF SLIP-RING DEVICES TO INTERFACE WITH THE LARGE ARRAYS OF SENSING ELEMENTS ON THE MOVING MEMBER. THE CONVENTIONAL MECHANICAL SLIP-RING DEVICES ARE SPEED, NOISE, SIZE AND LIFE-TIME LIMITED. THE OBJECTIVE OF THIS EFFORT IS TO DEVELOP A HIGH-SPEED, ELECTRO-OPTIC SLIP RI ...

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