TEMPERATURE SENSITIVE, VARIABLE AREA FLOW REGULATOR FOR JOULE-THOMSON NOZZLES

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$381,007.00
Award Year:
1986
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
1763
Agency Tracking Number:
1763
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
7662 East Gray Road #107, Scottsdale, AZ, 85260
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Graham Walker
Investigator
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
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 INNOVATIVE APPROACHES TO ACHIEVE THIS DESIRABLE LOAD DEMAND CHARACTERISTIC IN JOULE-THOMSON NOZZLES AND ALSO TO VIRTUALLY ELIMINATE A COMMON PROBLEM OF JOULE-THOMSON NOZZLES: ORIFICE BLOCKAGE BY CONDENSED CONTAMINANTS IN THE WORKING FLUID. THESE TWO OBJECTIVES ARE ACCOMPLISHED BY THE EFFECTIVE COMBINATION OF MATERIALS HAVING DIFFERENT COEFFICIENTS OF THERMAL EXPANSION AND BY DESIGN FOR EXPANSION IN A TAPERED ANNULUS EQUIPPED WITH LABYRINTH FLOW SPOILERS (ALSO SERVING AS CATCHMENT RESERVOIRS FOR CONDENSED CONTAMINANTS). THE EFFORT IS SPECIFICALLY DIRECTED TO GAS LIQUEFIERS USED TO CONDENSE THE VAPOR BOIL-OFF FROM HYDROGEN AND OXYGEN FUELS STORED ON SPACECRAFT IN INSULATED DEWAR VESSELS AT CRYOGENIC TEMPERATURE.

* information listed above is at the time of submission.

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