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Fast Start APU Technology
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English
Abstract
Advanced military fixed and rotary wing aircraft will require more compact, lighter weight small gas turbine auxiliary power units (APU's) and jet fuel starters (JFS), capable of faster starting and delivering high specific power outputs over wider operating envelopes.
APU start system weights can be a significant fraction of the total installed APU weight, especially if fast starts are demanded under sub-Arctic environments. It is shown that both start system weight, and rotor containment armor weight are proportional to the product of rotational speed squared and rotating assembly inertia. Significant weight savings are therefore feasible with rotating assemblies using lower density materials such as ceramics and composites.
This paper discusses the results of analytical studies supported by current development efforts and research paths to implement fast start technology for small gas turbine APU's.
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Authors
Citation
Rodgers, C., "Fast Start APU Technology," SAE Technical Paper 861712, 1986, https://doi.org/10.4271/861712.Also In
References
- Pahl D.A. “Hydrazine APU Starter Development,” AFWAL-TR-93-2039
- Rominek J. P. “Pressurized Air Start System for Small Gas Turbines,” SAE SP598
- Binsley R. L. U.S. Patent 3439495 April 1969
- Williams J. A. Lucci H. D. McFadden B. L. “Aircraft Super Integrated Power Unit,” SAE 821461
- Friedrich H. Schaper J. “Integrated Power Units,” Inst. Mechanical Engineers London 1984
- Napier J. C. “Advancements in Application of Ceramics to the Gemini Gas Turbine,” ASME 85 GT-183
- Keller W. F. Anderson L. “F20 Air Turbine Cartridge Start System,” SAE.SP.598
- Rodgers C. “Starting Torque Characteristics of Small Gas Turbines & APUs,” ASME 79-GT-95
- “Aircraft Accessory Drag Torque During Engine Starts,” SAE.AIR 1087A