t j poliskie week 5 february 15 2007
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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

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 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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