Accession Number : ADA294507

Title :   High Pressure Earth Storable Rocket Technology Program. Basic Program.

Descriptive Note : Final rept.,

Corporate Author : TRW SPACE AND TECHNOLOGY GROUP REDONDO BEACH CA

Personal Author(s) : Chazen, M. L. ; Sicher, D. ; Huang, D. ; Mueller, T.

PDF Url : ADA294507

Report Date : MAR 1995

Pagination or Media Count : 78

Abstract : The HIPES Program was conducted for NASA-LeRC by TRW. The Basic Program consisted of system studies, design of testbed engine, fabrication and testing of engine. Studies of both pressure-fed and pump-fed systems were investigated for N204 and both MMH and N2H4 fuels with the result that N2H4 provides the maximum payload for all satellites over MMH. The higher pressure engine offers improved performance with smaller envelope and associated weight savings. Pump-fed systems offer maximum payload for large and medium weight satellites while pressure-fed systems offer maximum payload for small light weight satellites. The major benefits of HIPES are high performance within a confined length maximizing payload for lightsats which are length(volume) constrained. Three types of thrust chambers were evaluated-Copper heatsink at 400, 500 and 600 psia chamber pressures for performance(thermal, water cooled to determine heat absorbed to predict rhenium engine operation and rhenium to validate the concept. The HIPES engine demonstrated very high performance at 50 lbf thrust(epsilon= 150) and Pc=500 psia with both fuels:Isp=337 sec using N2O4-N2H4 and Isp=327.5 sec using N2O4-MMH indicating combustion efficiencies >98%. A powder metallurgy rhenium engine demonstrated operation with high performance at Pc=500 psia which indicated the viability of the concept. jg

Descriptors :   *EARTH ORBITS, *HIGH PRESSURE, *RHENIUM, *STORABLE ROCKET PROPELLANTS, HYDRIDES, PAYLOAD, TEST BEDS, SPACECRAFT, HYDRAZINES, WATER, JET ENGINES, COOLING, HYDROGEN, FUELS, COPPER, ARTIFICIAL SATELLITES, PRESSURE, OPERATION, LIGHTWEIGHT, SYSTEMS ANALYSIS, POWDER METALLURGY, CONFINEMENT(GENERAL), NITROGEN OXIDES, INJECTORS, WEIGHT REDUCTION, ENVELOPE(SPACE), HEAT SINKS, ROCKET PROPELLANTS, PUMPING, THRUST CHAMBERS, BIPROPELLANTS, SOFT LANDINGS, PLANETARY SATELLITES.

Subject Categories : Astronautics
      Inorganic Chemistry
      Physical Chemistry
      Jet and Gas Turbine Engines
      Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE