scholarly journals Development of an Oilless, Gearless, and Bleedable Under Armor Auxiliary Power Unit

1995 ◽  
Author(s):  
Robert Nims
Keyword(s):  
Power Unit ◽  
Environmental Control ◽  
Electrical Power ◽  
Development Program ◽  
Field Tests ◽  
The United States ◽  
Test Time ◽  
Laboratory System ◽  
Auxiliary Power Unit ◽  
Auxiliary Power

The oilless, gearless and bleedable under armor auxiliary power unit (UAAPU) development program is providing the United States Army with a technically advanced auxiliary power unit (APU) for military tracked vehicles. Fully functional prototypes in two configurations are being demonstrated in both laboratory and field tests. The APU power output is 32 kw (43 shp) with 10 to 20 kw supplied as electrical power and the balance of power delivered as elevated pressure bleed air for use in conjunction with the vehicle nuclear, biological, and chemical (NBC) filtration and environmental control system (ECS). The design of the UAAPU incorporates air bearings and a shaft-speed permanent-magnet starter/generator with electronic power conditioning to eliminate completely the need for oil lubrication and an auxiliary gearbox. This significantly simplifies the mechanical design of the APU with resulting reliability, durability, and maintainability improvements. Over 600 hours of laboratory system development test time has been logged and 90 hours in field tests on an M1A1 main battle tank. Operations in the field have included both gunnery and simulated warfare training exercises.

scholarly journals Operation of the CT7 Turboprop Engine as an Auxiliary Power Unit (APU)

1986 ◽  
Author(s):  
J. D. Stewart
Keyword(s):  
Power Unit ◽  
Environmental Control ◽  
Electrical Power ◽  
Development Program ◽  
General Electric ◽  
Auxiliary Power Unit ◽  
Technical Requirements ◽  
Auxiliary Power ◽  
Turboprop Engine ◽  
New Generation

In response to the need of the new generation of commuter airliners, General Electric has developed the CT7 Turboprop engine so that it may be used as an Auxiliary Power Unit (APU) in addition to its normal mission as a prime propulsion unit. The General Electric CT7 Turboprop is a 1700 shaft horsepower class engine (Figure 1) developed for the new generation of 30+ passenger commuter and executive aircraft(1). Beyond this, the CT7 engine now offers the airlines a self-contained APU system to provide bleed air for the Environmental Control System (ECS) and electrical power for the aircraft during ground operation. This negates the need for a separate on-board APU with its extra cost, weight and fuel consumption and also eliminates the requirements for ground power units at the airlines’ operational terminals. The development of the engine as an APU generated a new set of technical requirements for the design and development and necessitated the development of special certification requirements as this was a new and unique operating condition for an aircraft prime propulsion system. A propeller brake had to be developed to lock the propeller and power turbine system and the engine had to be designed to operate at or near idle while producing large amounts of bleed air and electrical power. This development program was successfully completed in mid-1985 with the certification of the aircraft to operate with the CT7 Turboprop engine running as an APU.

scholarly journals Garrett GTP50-1 Multipurpose Small Power Unit Technology Demonstrator Program

1991 ◽  
Author(s):  
R. E. Annati ◽  
J. R. Smyth
Keyword(s):  
Power Systems ◽  
United States Army ◽  
Power Unit ◽  
High Reliability ◽  
Development Program ◽  
The United States ◽  
Advanced Technology ◽  
Small Power ◽  
Auxiliary Power ◽  
Manufacturing Technologies

The Multipurpose Small Power Unit (MPSPU) Advanced Development Program is providing the United States Army and other Department of Defense branches with advanced technology for current and future auxiliary power units (APUs)/secondary power systems (SPSs) in aircraft, combat vehicles, and mobile shelters. The design includes low specific fuel consumption (SFC), weight and volume, acquisition and life cycle costs (LCC), and high reliability and durability. The Garrett Auxiliary Power Division (GAPD) Model GTP50-1 MPSPU has demonstrated major advances in small gas turbine power unit design and manufacturing technologies. Component test rigs have completed extensive development testing. Power unit operation of 214 hours, with 557 starts, has been accumulated. Power unit and rig testing has demonstrated program goals and identified areas for continued technical development. The program has demonstrated 77.6 kW (104 shp), corrected to sea level standard day, at an SFC of 0.5 kg/kW-hr (0.8 lb/hp-hr).

scholarly journals Garrett Multipurpose Small Power Unit (MPSPU) Program Status

1989 ◽  
Author(s):  
J. Kidwell
Keyword(s):  
United States Army ◽  
Power Unit ◽  
High Reliability ◽  
Development Program ◽  
Advanced Technology ◽  
Small Power ◽  
Auxiliary Power Unit ◽  
Detail Design ◽  
Auxiliary Power ◽  
Low Weight

The Garrett Auxiliary Power Division’s Multipurpose Small Power unit (MPSPU), Contract DAAJ02-86-C-0006, sponsored by the Aviation Applied Technology Directorate, Ft. Eustis, Virginia, has progressed through detail design and analysis to component and power unit development testing. The MPSPU Advanced Development program is structured to provide advanced technology for current and future United States Army and other Department of Defense auxiliary power unit/secondary power system applications for aircraft, combat vehicles, and mobile tactical shelters. The MPSPU has been designed for low specific fuel consumption, low weight and volume, low acquisition and life cycle costs and high reliability and durability. This paper discusses the design and current developmental status of the Garrett GTP50 MPSPU as reported by Kidwell (1988).

scholarly journals The GTCP331, a 600 HP Auxiliary Power Unit Program

1983 ◽  
Author(s):  
L. M. Stohlgren
Keyword(s):  
Power Unit ◽  
Electrical Power ◽  
Operating Cost ◽  
Sound Design ◽  
Test Program ◽  
Transport Aircraft ◽  
Auxiliary Power Unit ◽  
Auxiliary Power ◽  
Rigorous Test ◽  
Background State

The Garrett GTCP331 series auxiliary power unit (APU) is currently entering airline service as a Category I -Essential APU with the Boeing and Airbus advanced transport aircraft. The GTCP331 APU serves as a secondary pneumatic and electrical power source for the aircraft systems, both on the ground and in-flight. As it enters airline service, the GTCP331 APU offers: sound design origin, advanced metallurgical technology, a rigorous test program background, state-of-the-art full authority digital electronic controls, and the application of acoustic attenuating techniques and materials. These facets combine to present user-airlines with a modern, high-technology APU that through lowered operating cost, and increased reliability and maintainability, meets the challenge of reduced cost of ownership.

Approximation of Payback Period of Fuel Cell Auxiliary Power Unit for Large Trucks

2009 ◽  
Vol 129 (2) ◽  
pp. 228-229
Author(s):  
Noboru Katayama ◽  
Hideyuki Kamiyama ◽  
Yusuke Kudo ◽  
Sumio Kogoshi ◽  
Takafumi Fukada
Keyword(s):  
Fuel Cell ◽  
Power Unit ◽  
Payback Period ◽  
Auxiliary Power Unit ◽  
Auxiliary Power

Electric auxiliary power unit for Shuttle evolution

1989 ◽  
Author(s):  
DOUG MEYER ◽  
KENT WEBER ◽  
WALTER SCOTT
Keyword(s):  
Power Unit ◽  
Auxiliary Power Unit ◽  
Auxiliary Power

scholarly journals Improving EGT sensing data anomaly detection of aircraft auxiliary power unit

2020 ◽  
Vol 33 (2) ◽  
pp. 448-455 ◽  
Author(s):  
Liansheng LIU ◽  
Yu PENG ◽  
Lulu WANG ◽  
Yu DONG ◽  
Datong LIU ◽  
...  
Keyword(s):  
Anomaly Detection ◽  
Power Unit ◽  
Sensing Data ◽  
Auxiliary Power Unit ◽  
Auxiliary Power

Low-Emissions Technology Development for Auxiliary Power Unit Combustion Systems

2021 ◽  
Author(s):  
Thomas Bronson ◽  
Rudy Dudebout ◽  
Nagaraja Rudrapatna
Keyword(s):  
Gas Turbine ◽  
Power Unit ◽  
Fuel Injection ◽  
Oxides Of Nitrogen ◽  
Combustion System ◽  
Auxiliary Power Unit ◽  
Criteria Pollutants ◽  
Auxiliary Power ◽  
Combustion Systems ◽  
Aircraft Application

Abstract The aircraft Auxiliary Power Unit (APU) is required to provide power to start the main engines, conditioned air and power when there are no facilities available and, most importantly, emergency power during flight operation. Given the primary purpose of providing backup power, APUs have historically been designed to be extremely reliable while minimizing weight and fabrication cost. Since APUs are operated at airports especially during taxi operations, the emissions from the APUs contribute to local air quality. There is clearly significant regulatory and public interest in reducing emissions from all sources at airports, including from APUs. As such, there is a need to develop technologies that reduce criteria pollutants, namely oxides of nitrogen (NOx), unburned hydrocarbons (UHC), carbon monoxide (CO) and smoke (SN) from aircraft APUs. Honeywell has developed a Low-Emissions (Low-E) combustion system technology for the 131-9 and HGT750 family of APUs to provide significant reduction in pollutants for narrow-body aircraft application. This article focuses on the combustor technology and processes that have been successfully utilized in this endeavor, with an emphasis on abating NOx. This paper describes the 131-9/HGT750 APU, the requirements and challenges for small gas turbine engines, and the selected strategy of Rich-Quench-Lean (RQL) combustion. Analytical and experimental results are presented for the current generation of APU combustion systems as well as the Low-E system. The implementation of RQL aerodynamics is well understood within the aero-gas turbine engine industry, but the application of RQL technology in a configuration with tangential liquid fuel injection which is also required to meet altitude ignition at 41,000 ft is the novelty of this development. The Low-E combustion system has demonstrated more than 25% reduction in NOx (dependent on the cycle of operation) vs. the conventional 131-9 combustion system while meeting significant margins in other criteria pollutants. In addition, the Low-E combustion system achieved these successes as a “drop-in” configuration within the existing envelope, and without significantly impacting combustor/turbine durability, combustor pressure drop, or lean stability.

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