T j poliskie week 5 february 15 2007
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T.J. Poliskie Week 5: February 15, 2007 PowerPoint PPT Presentation


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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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T j poliskie week 5 february 15 2007

T.J. PoliskieWeek 5: February 15, 2007

PropulsionEarth Taxi, Mars Taxi Group

Zero Boil-Off Cryogenic Propulsion

Poliskie - 1


Zero boil off cryogenic storage

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


Updated storage mass volume

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


Thrust determination

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


Backup slides

Backup Slides

Poliskie - 5


Propellant mass calculation

Propellant Mass Calculation

Poliskie - 6


Propellant storage volume

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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