Award Data

THIS PROPOSAL COVERS THE DEVELOPMENT OF A 0.25 WATT, 80 K MECHANICAL CRYOCOOLER FOR USE IN SENSOR COOLING IN SPACE. THE CRYOCOOLER WILL USE THE MIKULIN PULSE TUBE CYCLE THAT HAS NO MOVING PARTS IN THE COLD SECTION OF THE CRYOCOOLER. THE ELIMINATION OF COLD MOVING PARTS REMOVES THE MAIN SOURCES OF FAILURE AND OF VIBRATION IN THE CRYOCOOLER. LIFETIMES OF OVER FIVE YEARS SHOULD BE POSSIBLE WITH THIS ...

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CIVILIAN AND MILITARY SPACECRAFT SYSTEMS, COMMUNICATIONS, DETECTION, TRACKING AND SURVEILLANCE ACTIVITES CAN BE ENDANGERED OR DEGRADED BY SOLAR ACTIVITY. THE SUN INDUCES THESE DISTURBANCES THROUGH MAGNETIC FIELD DISTURBANCES, ELECTROMAGNETIC AND CHARGED PARTICLE IRRADIATION OF THE EARTH'S UPPER ATMOSPHERES. ONE METHOD OF CIRCUMVENTING SERIOUS CONSEQUENCES OF THIS ACTIVITY IS THROUGH SPACE BASEDMON ...

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BIR PROPOSES AN INNOVATIVE PORTABLE X-RAY DETECTION AND MEASUREMENT SYSTEM FOR NDE APPLICATIONS. BASED ON A FILMLESS CASSETTE OF DISCRETE DIGITAL X-RAY DECECTORS, SUCH A SYSTEM WOULD ENABLE DIRECT DIGITAL IMAGING FOR VIEWING, VCR RECORDING, OR FOR COMPUTER ANALYSIS. THE SYSTEM WOULD RESEMBLE A FILM CASSETTE IN ITS PORTABILITY AND IMAGE SENSITIVITY AND RESOLUTION. WE PROPOSE TO CAREFULLY EVALUATE T ...

FUNDAMENTAL PHYSICS OF THE COMBUSTION PROCESSES IN LIQUID ROCKET ENGINES IS VERY COMPLEX. RECENT ADVANCES IN COMPUTATIONAL FLUID DYNAMICS (CFD) PROVIDE A BASIC MECHANISM FOR DETAILED ANALYSES. THE EXISTENCE OF CFD TECHNIQUES INCREASES THE NEED OF ADEQUATE MODELS FOR PHYSICAL PROCESSES, SUCH AS: ATOMIZATION AND SPRAY FORMATIONUNDER SUB AND SUPERCRITICAL CONDITIONS, DROPLET-DROPLET INTERACTION, TURB ...

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A METHODOLOGY FOR ANALYZING TWO-PHASE FLOW SYSTEM IN A MICROGRAVITY ENVIRONMENT WILL BE DEVELOPED. THE MAIN OBJECTIVE OF THIS PROPOSAL IS TO CONSTRUCT A COMPUTER MODEL WHICH WILL BE HELPFUL IN THE EVALUATION OF COMCEPTUAL DESIGNS OF THERMAL CONDITIONING SYSTEMS FOR SPACE CRAFTS. THE MIDEL WILL ALSO PROVIDE A TOOL FOR ANALYZING TRANSIENTS DUE TO START UP, SHUTDOWN OR ACCIDENTAL SITUATION. ONE OF TH ...

THE OBJECTIVE OF THIS PROPOSAL IS TO IMPROVE THE EXISTING REFLAN3D-SPRAY COMPUTER CODE TO PROVIDE A STATE-OF-THE-ART MODEL FOR SIMULATING ROCKET THRUST CHAMBERS. THREE MAJOR AREAS OF IMPROVEMENT ARE PROPOSED: (A) ACCURACY; (B) PHYSICAL REALISM; AND (C) COMPUTATIONAL EFFICIENCY. THEIMPROVED PHYSICAL MODELS TO BE INCORPORATED ARE: TRANSIENT CAPABILITIES, CONJUGATE HEAT TRANSFER IN COMBUSTION COOLING ...

AN ANALYTICAL MODEL AND A COMPUTER CODE FOR THE DETAILED SIMULATION OF THREE-PHASE FLOWS IN LIQUID ROCKET THRUST CHAMBERS IS PROPOSED. THE MODEL DESCRIBES BEHAVIOR OF THE LIQUID, DISPERSED AND GASEOUS PHASES IN A MOST EFFICIENT FORM. THE CONTINOUS GAS-PHASE FLOW AND COMBUSTION ARE DESCRIBED IN EULERIAN COORDINATES; THE SPRAY FLOW, DROPLET EVAPORATION AND COMBUSTION PROCESSES ARE SIMULATED IN A GRI ...