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Hybrid Power Generation for Achieving Airship Neutral Buoyancy
Technical Paper
2006-01-3089
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
Power Systems Conference
Language:
English
Abstract
Airships offer unique design challenges compared to conventional aerospace vehicles. During cruise flight modes, Airships can obtain dynamic lift by either envelope design or by adjusting pitch to compensate for either negative or positive buoyancy. However, when hovering the vehicle must have a propulsion system that can compensate for changes in buoyancy, such as consumed fuel. Release of ballast or lifting gas are options to adjust vehicle buoyancy, but often not desirable. To provide additional vertical thrust, the propulsion system must have additional engines not used for cruise propulsion, or the ability to redirect existing thrust. Both options add expense and complexity to the design.
The use of a “hybrid” power generation system comprised of multiple power conversion processes and fuels is treated in a generalized approach. An example system using gaseous hydrogen stored in a gas bag within a helium filled airship envelope, with pressurized liquid ammonia in tanks, is examined. Expressions are derived for the ratio of ammonia internal combustion engine to hydrogen fuel cell power to maintain neutral buoyancy of the airship considering the consumption of fuel, and the collection of by-product water. Two other cases, analyzing jet-fuel supplied turbo-propulsion engines with gaseous hydrogen and ammonia were also studied.
This paper develops and applies a generalized parametric graph theory based energy model for the conversion between chemical to mechanical or electrical energy domains. This methodology is suitable to other applications as a tool for system level conceptual design and requirements definition. Additionally, the relationships for power generation and distribution to vehicle systems are suitable for optimization methods.
This analysis was performed in the context of a large commercial cargo airship concept, which was required to hover while loading and unloading 160 tons of cargo, and could vary in buoyancy up to 50 tons due to fuel burn alone.
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Citation
Severns, C., "Hybrid Power Generation for Achieving Airship Neutral Buoyancy," SAE Technical Paper 2006-01-3089, 2006, https://doi.org/10.4271/2006-01-3089.Data Sets - Support Documents
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References
- Althoff, William “Sky Ships- A History of the Airship in the United States Navy” Pacifica Press New York 1990 0-935553-32-0
- Woodward, Donald et. al. “Part I- Lessons Learn: Classical Airships of the Past” LAT Technology Assessment, AIAA Annual Conference California May 10-12 1983
- Gottlieb, Gregory “CargoLifter AG: Logistics Solutions Using Lighter-Than-Air” (AIAA 2001-5265) 1st AIAA Aircraft Technology, Integration and Operations Forum Los Angeles, CA Oct. 16 - 18 2001
- Nayler, Arnold “Airship Development World-Wide- A 2001 Review” (AIAA 2001-5263) 1st AIAA Aircraft Technology, Integration and Operations Forum Los Angeles, CA Oct. 16 - 18 2001
- Daggett D. Eelman S. et. al. “Fuel Cell APU for commercial aircraft,” AIAA-2003-2660 2003
- Daggett D. et. Al. “Fuel Cell APU for commercial aircraft,” E2Expo Hamburg, Germany September 2005
- Rajashekara K. S et. al. “Solid Oxide Fuel Cell/Gas Turbine Hybrid APU system for Aerospace Applications,” IEEE / IAS 41st Annual Meeting October 8 - 12 2006 Marriott Waterside Hotel, Tampa Florida
- Bock, Jürgen “Natural Gas/Methane as Gaseous fuel for Helium Airships” AEROSTATION Sept. 2004
- Horkheimer, Donald “Ammonia- solution for Airships demanding rapid Changes in Net Buoyancy” AIAA 2005-7393 September 2005
- Bock, Jürgen “Potential of Liquid/Gaseous hydrogen operation of Airship Carriers” AEROSTATION Sept. 2004
- Munson, Kenneth “CARGOLIFTER CL 160” Jane's All the World's Aircraft Jane's Information Group 10 Jan 2003
- Van Treuren, R. G. “The Hydrogen Ballonet” AIAA 2003-6838 ATIO Tech 17 - 19 November 2003 Denver, Colorado, USA
- Montbrun-Di Filippo, J. Delgado, M. “A Survey of Bond Graphs: theory, Applications and Programs” The Franklin Institute, Pergamon Press New York 328 5 6 1991 565 606
- Mann, Herman “Physical Modeling with Multipoles” IEEE, International Symposium on Computer Aided Control Systems Design August 1999 158 163
- Karnopp, Dean et. al. “System dynamics: A Unified Approach” Wiley 1990
- Khaled, A. et.al. “Generic bond graphs procedure for chemical reactions modeling”
- Margolis, Donald “Bond Graphs, Modeling, and Simulation in Industry: Some examples where costly mistakes could have been avoided” IEEE-2002
- Seshu, S. Reed, M. B. “Linear Graphs and Electrical Networks” Addison-Wesley Publishing Company, Inc. Reading, MA 1961
- Harary, F. Palmer, E. M. “Graphical Enumeration” Academic Press, Inc. New York, NY 1973