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T.J. Poliskie Week 5: February 15, 2007

T.J. Poliskie Week 5: February 15, 2007. Propulsion Earth Taxi, Mars Taxi Group Zero Boil-Off Cryogenic Propulsion. Zero Boil-Off Cryogenic Storage. Passive Storage Boil-off occurs at a constant rate 0.36 kg/hr LOX 0.45kg/hr LH2 Zero Boil-Off Active cooling using cryocooler/mixing unit

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T.J. Poliskie Week 5: February 15, 2007

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  1. T.J. PoliskieWeek 5: February 15, 2007 PropulsionEarth Taxi, Mars Taxi Group Zero Boil-Off Cryogenic Propulsion Poliskie - 1

  2. Zero Boil-Off Cryogenic Storage • Passive Storage • Boil-off occurs at a constant rate • 0.36 kg/hr LOX • 0.45kg/hr LH2 • Zero Boil-Off • Active cooling using cryocooler/mixing unit • Power requirement depending on tank size and temperature (50-200W) • Additional equipment needed (radiator, heat exchanger, pump) Poliskie - 2

  3. Updated Storage Mass/Volume • Earth Taxi • Payload: 17.5 mt • ZBO Storage Mass: ~500kg • Propellant Mass: 20.9 mt • LH2 Storage Volume: 68 m^3 • LOX Storage Volume: 24 m^3 • Mars Taxi • Payload: 12 mt • ZBO Storage Mass: ~500kg • Propellant Mass: 29.5 mt • LH2 Storage Volume: 90 m^3 • LOX Storage Volume: 30 m^3 Poliskie - 3

  4. Thrust Determination • Earth Taxi • ΔV: 3.25 km/s • Burn Time: 200 s • Thrust: 461 kN • Mars Taxi • ΔV: 5.02 km/s • Burn Time:250 s • Thrust: 520 kN Poliskie - 4 Source: Poliskie, 2/14/07

  5. Backup Slides Poliskie - 5

  6. Propellant Mass Calculation Poliskie - 6

  7. Propellant Storage Volume mlh2 = m_p./(1+mixr) mlox = mixr.*mlh2 v_t_lh2 = mlh2/70.9*1000 v_t_lox = mlox/1149*1000 Note: 50% propellant storage volume added to accommodate zero boil-off Poliskie - 7

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