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Week 8 Presentation Thursday, March 5, 2009

Translunar Orbit Transfer Vehicle (OTV): Propulsion System Setup for 100g & 10 kg Case Launch Vehicle Selection for Arbitrary Case Thermal Analysis of EP System. Week 8 Presentation Thursday, March 5, 2009. 1. From PCDU. S/C Communication. GLXP Electric Propulsion System Setup. PPU.

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Week 8 Presentation Thursday, March 5, 2009

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  1. Translunar Orbit Transfer Vehicle (OTV): Propulsion System Setup for 100g & 10 kg CaseLaunch Vehicle Selection for Arbitrary CaseThermal Analysis of EP System Week 8 Presentation Thursday, March 5, 2009 Brad Appel Propulsion Group 1

  2. From PCDU S/C Communication GLXP Electric Propulsion System Setup PPU 1 T XENON TANK 2 11 S 3 P 5 4 6 7 0.2 m P T 8 HALL THRUSTER 9 10 Power / Intercomm Xenon System Thermal System • No redundancies, no integration costs Brad Appel Propulsion Group 2

  3. Preliminary Design Considerations for OTV Arbitrary Payload • The Falcon 9-Heavy is 6% cheaper than the Falcon 9 by cost per mass to LLO, but the Falcon 9H option may be ruled out for technical reasons. • The team should focus analysis on the Falcon 9, but can’t rule out Falcon 9H yet. Brad Appel Propulsion Group 3

  4. Backup Slides: Thruster Radiation Sleeve • Radiates away • waste heat from • Hall Thruster • 12 gauge • Aluminum sheet • metal with high • emissivity paint • Worked with Ian • Meginnis Brad Appel Propulsion Group 4

  5. Backup Slides: Xenon Thermal Analysis • Maximize storage pressure for volume • efficiency (~ 150 bar) • Maintain tank temperature for gaseous Xenon phase: •  Balance heat due to radiation and pressure drop • with a resistance heater • Curve data from National Institute of Standards and Technology Supercritical Storage Region Liquid Gas Allowed temperature path of propellant Temperature (K) Brad Appel Propulsion Group 5

  6. Backup Slides: Industry Contacts Brad Appel Propulsion Group • Busek – Bruce Pote • Hall thrusters, package deal for Prop System • Moog – Edward Bushway • Valves and feed system components • ATK Space Systems – Walter Tam • Xenon storage tanks • Mitsubishi Electric Co. – OsugaHiroyugi • Alternative Hall Thruster (in development) • Mott Corp • Sintered flow restrictors • Arde Aerospace Propulsion Systems • Xenon storage tanks 6

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