CARBON-CARBON/REFRACTORY METAL HEAT PIPES FOR LEADING EDGE COOLING ON REUSABLE HYPERSONIC VEHICLES

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$249,897.00
Award Year:
1992
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
16889
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Ultramet
12173 Montague St, Pacoima, CA, 91331
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
REUSABLE HYPERSONIC VEHICLES, OPERATING WELL BEYOND THE PERFORMANCE ENVELOPE OF CONVENTIONAL AIRCRAFT, WILL ENCOUNTER EXTREMELY HIGH TEMPERATURES; DURING REENTRY, THE NOSE WILL EXPERIENCE IN EXCESS OF 5000 DEGREES FAHRENHEIT, AND LEADING-EDGE SURFACES WILL FEEL NEARLY 3500 DEGREES FAHRENHEIT. CLEARLY, LIGHTWEIGHT LEADING-EDGE COOLING CONCEPTS ARE NEEDED TO WITHSTAND SUCH HIGH TEMPERATURES. THE HEAT PIPE--A QUASIPASSIVE, SELF-CONTAINED, LOW-MAINTENANCE DEVICE--SHOULD BE WELL-SUITED FOR LEADING-EDGE COOLING APPLICATIONS. THIS PHASE I PROJECT WILL DEMONSTRATE THE FEASIBILITY OF FABRICATING A STRAIGHT D-SHAPED HEAT PIPE BY CHEMICAL VAPOR DEPOSITION (CVD) AND INFILTRATION (CVI). THE WICK WILL BE A REFRACTORY-METAL-INFILTRATED CARBON FOAM, AND THE CONTAINER WALLS WILL BE A THIN REFRACTORY METAL SKIN OR SHELL. COMPATIBILITY OF THE CHOSEN REFRACTORY-METAL WITH CARBON-CARBON WILL BE ESTABLISHED, AND A CVD TECHNIQUE FOR PRODUCING CONTAINER WALLS OF MINIMUM THICKNESS FOR WEIGHT REDUCTION WILL BE DEFINED. AT THE END OF THE PROJECT, THE HEAT PIPE WILL BE FILLED WITH A WORKING FLUID AND TESTED FORISOTHERMAL OPERATION. THE RESULT WILL BE THE DEFINITION OF TECHNIQUES FOR FABRICATING ACTUAL LEADING-EDGE HEAT PIPE CONFIGURATIONS IN PHASE II AND BEYOND. REUSABLE HYPERSONIC VEHICLES, OPERATING WELL BEYOND THE PERFORMANCE ENVELOPE OF CONVENTIONAL AIRCRAFT, WILL ENCOUNTER EXTREMELY HIGH TEMPERATURES; DURING REENTRY, THE NOSE WILL EXPERIENCE IN EXCESS OF 5000 DEGREES FAHRENHEIT, AND LEADING-EDGE SURFACES WILL FEEL NEARLY 3500 DEGREES FAHRENHEIT. CLEARLY, LIGHTWEIGHT LEADING-EDGE COOLING CONCEPTS ARE NEEDED TO WITHSTAND SUCH HIGH TEMPERATURES. THE HEAT PIPE--A QUASIPASSIVE, SELF-CONTAINED, LOW-MAINTENANCE DEVICE--SHOULD BE WELL-SUITED FOR LEADING-EDGE COOLING APPLICATIONS. THIS PHASE I PROJECT WILL DEMONSTRATE THE FEASIBILITY OF FABRICATING A STRAIGHT D-SHAPED HEAT PIPE BY CHEMICAL VAPOR DEPOSITION (CVD) AND INFILTRATION (CVI). THE WICK WILL BE A REFRACTORY-METAL-INFILTRATED CARBON FOAM, AND THE CONTAINER WALLS WILL BE A THIN REFRACTORY METAL SKIN OR SHELL. COMPATIBILITY OF THE CHOSEN REFRACTORY-METAL WITH CARBON-CARBON WILL BE ESTABLISHED, AND A CVD TECHNIQUE FOR PRODUCING CONTAINER WALLS OF MINIMUM THICKNESS FOR WEIGHT REDUCTION WILL BE DEFINED. AT THE END OF THE PROJECT, THE HEAT PIPE WILL BE FILLED WITH A WORKING FLUID AND TESTED FORISOTHERMAL OPERATION. THE RESULT WILL BE THE DEFINITION OF TECHNIQUES FOR FABRICATING ACTUAL LEADING-EDGE HEAT PIPE CONFIGURATIONS IN PHASE II AND BEYOND.

* information listed above is at the time of submission.

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