Accession Number : ADA304600

Title :   Development and Validation of Purged Thermal Protection Systems for Liquid Hydrogen Fuel Tanks of Hypersonic Vehicles.

Descriptive Note : Contractor rept.,

Corporate Author : BELL AEROSPACE TEXTRON BUFFALO NY

Personal Author(s) : Helenbrook, R. G. ; Colt, J. Z.

PDF Url : ADA304600

Report Date : JUN 1977

Pagination or Media Count : 126

Abstract : An analytical and experimental investigation was conducted to develop and validate an economical, lightweight, safe, efficient, reliable and reusable insulation system for hypersonic cruise vehicle hydrogen fuel tanks. Results of the study indicate that a nitrogen purged, layered insulation system with nonpermeable closed-cell insulation next to the cryogenic tank and a high service temperature fibrous insulation surrounding it is potentially an attractive solution to the insulation problem. For the postulated hypersonic flight the average unit weight of the purged insulation system (including insulation, condensate and fuel boil off) is 6.31 kg/m (1.29 psf). Limited cyclic tests of large specimens of closed cell polymethacrylimide foam indicate it will withstand the expected thermal cycle.

Descriptors :   *FUEL TANKS, *HYPERSONIC AIRCRAFT, *THERMAL INSULATION, HEAT TRANSFER, PERMEABILITY, STRESS ANALYSIS, VALIDATION, HIGH TEMPERATURE, NITROGEN, RELIABILITY, THERMAL ANALYSIS, THERMAL DIFFUSION, LIGHTWEIGHT, LIQUID HYDROGEN, CARBON DIOXIDE, HYPERSONIC FLIGHT, REUSABLE EQUIPMENT, CRYOGENICS, THERMAL CYCLING TESTS, THERMAL STRESSES, SYSTEM SAFETY, IMIDES, CONDENSATION, FOAM, PURGING.

Subject Categories : Research and Experimental Aircraft
      Thermodynamics
      Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE