Sasakawa International Center for Space Architecture,       University of Houston College of Architecture
Advantages Economies of scale Can use today’s rockets Rapid generation of custom propulsion stages Engine reuse possib...
Scalability of numberEngine design essentially independent of burndurationUse identical engines, just burn longer for grea...
Propellant  N2O4/UDMHPros                         Cons• Space storable                         • Low Isp (~316 s)• Heritag...
Analytical Strategy                                 Mass estimates                              for one building block    ...
Analytical Results                                                          (N2O4)                                        ...
Estimates for other components                               (N2O4)                         Mass estimates                ...
Analytical Results                                                          (UDMH)                                        ...
Estimates for other components                               (UDMH)                         Mass estimates                ...
ResultsBased on the estimates given, the following payloads could bedelivered to Trans Lunar Injection (TLI):             ...
Extensions of the concept  Integrated  fuel/oxidizer(Increasesscalability)               Sasakawa International Center for...
Extensions of the conceptHydrogen propellant Deliver                            Rendezvous departure stage                ...
ReferencesBilstein, Roger E. Stages to Saturn. 1996. Gainesville: University Press of Florida, 2003. N. pag. Print.Brown, ...
Thank youFor Listening.Feedback appreciated.James Doehringjames.doehring@gmail.com            Sasakawa International Cente...
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In Space Propulsion Using Modular Building Blocks (Presentation)

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In Space Propulsion Using Modular Building Blocks (Presentation)

  1. 1. Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  2. 2. Advantages Economies of scale Can use today’s rockets Rapid generation of custom propulsion stages Engine reuse possible Does not require propellant transfer in microgravity Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  3. 3. Scalability of numberEngine design essentially independent of burndurationUse identical engines, just burn longer for greaterimpulseOptimize propellant storage andpressurization system for given engine Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  4. 4. Propellant N2O4/UDMHPros Cons• Space storable • Low Isp (~316 s)• Heritage • Toxic• Hypergolic• Liquid temperature overlap• Cheaper than MMH• Mass ratio nearly 2 The Long March 2F uses N2O4/UDMH for all stages Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  5. 5. Analytical Strategy Mass estimates for one building block Operating pressure Operating temperaturePropellant mass Propellant volume Propellant tank Check shroud diameter mass Helium volume Helium mass Helium tank mass Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  6. 6. Analytical Results (N2O4) Mass estimates for one building block Operating 60 psi pressure Operating 290 K temperature Propellant mass Propellant volume Propellant tank Check shroud diameter mass20,000 kg d = 2.98 m  OK 86.5 kg (aluminum alloy) Helium volume Helium mass 19.8 kg 169 liters (including solid propellant grains) Helium tank mass 23.4 kg (titanium liner, composite overwrap) Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  7. 7. Estimates for other components (N2O4) Mass estimates for one building block Item Mass (kg) Helium regulators (2) 6 Exoskeleton truss 100 Rails 75 Powered liquid disconnects (2) 40 Fluid lines 10 MMOD shielding 30 Residual propellant (2%) 400 Total dry mass = 785.7 kg Total mass = 20,785.7 kg  OK Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  8. 8. Analytical Results (UDMH) Mass estimates for one building block Operating 60 psi pressure Operating 290 K temperature Propellant mass Propellant volume Propellant tank Check shroud diameter mass17,778 kg d = 3.51 m  OK 140.8 kg(mass ratio (aluminum alloy)of 2.25) Helium volume Helium mass 22.7 kg 275 liters (including solid propellant grains) Helium tank mass 35.0 kg (titanium liner, composite overwrap) Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  9. 9. Estimates for other components (UDMH) Mass estimates for one building block Item Mass (kg) Helium regulators (2) 6 Exoskeleton truss 110 Rails 90 Powered liquid disconnects (1) 20 Fluid lines 10 MMOD shielding 40 Residual propellant (2%) 356 Total dry mass = 830.5 kg Total mass = 18,608.5 kg  OK Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  10. 10. ResultsBased on the estimates given, the following payloads could bedelivered to Trans Lunar Injection (TLI): Earth departure stage No. fuel No. oxidizer Space Payload to tanks tanks storable? TLI* Modular Building Blocks 1 2 yes 23,300 kg Modular Building Blocks 2 4 yes 50,500 kg Modular Building Blocks 3 6 yes 77,800 kg Delta IV Heavy no 11,000 kg Falcon Heavy no 16,000 kg Saturn V no 47,000 kg *Payload estimates for Modular Building Blocks were found using the rocket equation and assume a basic Hohmann transfer along with the following values: specific impulse of 316 seconds; delta-v of 3.18 kilometers per second; engine module mass of 4,000 kilograms; usable propellant fraction of 92%) Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  11. 11. Extensions of the concept Integrated fuel/oxidizer(Increasesscalability) Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  12. 12. Extensions of the conceptHydrogen propellant Deliver Rendezvous departure stage with depot to to LEO with pick up oxygen hydrogen only building blocks Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  13. 13. ReferencesBilstein, Roger E. Stages to Saturn. 1996. Gainesville: University Press of Florida, 2003. N. pag. Print.Brown, Charles D. Elements of Spacecraft Design. Ed. John S. Przemieniecki. Reston: American Institute of Aeronautics and Astronautics, 2002. N. pag. Print. AIAA Education Series.Chaffee, Norman. Personal interview. 7 Oct. 2011.Eichstadt, Frank. Personal communication. 15 Mar. 2011.Grush, Gene. Telephone interview. 17 Oct. 2011.Huzel, Dieter K., and David H. Huang. Modern Engineering for Design of Liquid-Propellant Rocket Engines. Ed. A. Richard Seebass. Washington DC: American Institute of Aeronautics and Astronautics, 1992. N. pag. Print.Ring, Elliot. Rocket Propellant and Pressurization Systems. Englewood Cliffs: Prentice-Hall, 1964. N. pag. Print.Sutton, George P., and Oscar Biblarz. Rocket Propulsion Elements. 8th ed. Hoboken: John Wiley & Sons, 2010. N. pag. Print. Sasakawa International Center for Space Architecture, University of Houston College of Architecture
  14. 14. Thank youFor Listening.Feedback appreciated.James Doehringjames.doehring@gmail.com Sasakawa International Center for Space Architecture, University of Houston College of Architecture
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