Foil Air Bearings Cleared to Land

1998 ◽  
Vol 120 (07) ◽  
pp. 78-80 ◽  
Author(s):  
Giri L. Agrawal
Keyword(s):  
Gas Turbine ◽  
General Aviation ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Air Bearings ◽  
Ground Vehicles ◽  
Foil Bearings ◽  
Cooling Flow ◽  
Auxiliary Power ◽  
Auxiliary Power Units

This article explores use of foil air bearings in land-based turbomachinery. A machine with foil air bearings is more reliable than one with rolling element bearings because it requires fewer parts to support the rotative assembly and needs no lubrication. Foil air bearings can handle severe environmental conditions such as the ingestion of sand and dust. A reversed pilot design at the cooling flow inlet prevents large particles from entering the bearing's flow path, and smaller particles are continually flushed out of the bearing by the cooling flow. Many applications of foil air/gas bearings other than air cycle machines have been built and successfully tested, but nothing appears to be currently in production. Foil bearings have strong potential in several applications. Among these are small general aviation gas turbine engines; oil-free cryogenic turboexpanders for gas separation plants; auxiliary power units for various aerospace and ground vehicles; and, taking advantage of automated manufacturing methods, automotive gas turbine engines, vapor-cycle centrifugal compressors, and commercial air/gas compressors.

Analysis of Gas Turbine Engines Auxiliary Power Units

2014 ◽  
Vol 533 ◽  
pp. 13-16
Author(s):  
Yu Yu Zuo
Keyword(s):  
Gas Turbine ◽  
Power Unit ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Turbine Engine ◽  
Ground Support ◽  
Auxiliary Power Unit ◽  
Aircraft Systems ◽  
Auxiliary Power ◽  
Auxiliary Power Units

As aircraft became more complex a need was created for a power source to operate the aircraft systems on the ground without the necessity for operating the aircrafts main engines. This became the task of the Auxiliary Power Unit (APU). The use of an APU on an aircraft also meant that the aircraft was not dependant on ground support equipment at an airfield. It can provide the necessary power for operation of the aircrafts Electrical, Hydraulic and Pneumatic systems. It should come as no surprise that the power unit selected to do this task is a Gas Turbine Engine.

scholarly journals Development of a Nonmetallic Abradable Material System for Gas Turbine Applications

1993 ◽  
Author(s):  
Daniel P. Rose ◽  
George D. Price ◽  
Alexander Bosna
Keyword(s):  
Gas Turbine ◽  
Galvanic Corrosion ◽  
Turbine Engines ◽  
Material System ◽  
Gas Turbine Engines ◽  
Material Development ◽  
Auxiliary Power ◽  
Auxiliary Power Units ◽  
Abradable Coatings ◽  
Salt Fog

The performance of gas turbine engines is highly dependent upon the clearance between compressor rotating blades or stator vanes, and adjacent shrouds. Auxiliary power units (APU) incorporate abradable coatings on compressor shrouds to allow for very small clearances and rub tolerance. The operating environment of the APU may result in a combination of abrasion between airfoil tips and shrouds, as well as galvanic corrosion of the abradable material. Experience has shown that established thermal spray abradable material systems that offer desirable abradability properties in laboratory testing may perform poorly when subjected to a combination of galvanic corrosion and abradable environment. This paper discusses development and evaluation of an abradable material that is composed of nonmetallic constituents. This material is not susceptible to galvanic corrosion, and maintains its abradable properties when operating in a combined corrosive and abradable environment. The material development, microstructure, and physical properties are discussed. In addition, the performance of the material in abradability testing, and warm salt fog testing is presented.

Test Experience With Turbine-End Foil Bearing Equipped Gas Turbine Engines

1983 ◽  
Author(s):  
F. J. Suriano ◽  
R. D. Dayton ◽  
Fred G. Woessner
Keyword(s):  
Gas Turbine ◽  
Thermal Environment ◽  
Full Range ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Engine Test ◽  
Gas Generator ◽  
Turbine Engine ◽  
Foil Bearings ◽  
Foil Bearing

The Garrett Turbine Engine Company, a Division of the Garrett Corporation, authorized under Air Force Contract F33615-78-C-2044 and Navy Contract N00140-79-C-1294, has been conducting development work on the application of gas-lubricated hydrodynamic journal foil bearings to the turbine end of gas turbine engines. Program efforts are directed at providing the technology base necessary to utilize high-temperature foil bearings in future gas turbine engines. The main thrust of these programs was to incorporate the designed bearings, developed in test rigs, into test engines for evaluation of bearing and rotor system performance. The engine test programs included a full range of operational tests; engine thermal environment, endurance, start/stops, attitude, environmental temperatures and pressures, and simulated maneuver bearing loadings. An 88.9 mm (3.5-inch) diameter journal foil bearing, operating at 4063 RAD/SEC (38,800 rpm), has undergone test in a Garrett GTCP165 auxiliary power unit. A 44.4 mm (1.75-inch) diameter journal foil bearing, operating at 6545 RAD/SEC (62,500 rpm) has undergone test in the gas generator of the Garrett Model JFS190. This paper describes the engine test experience with these bearings.

Ultra-High Temperature Compliant Foil Bearings: The Journey to 870°C and Application in Gas Turbine Engines — Experiment

2018 ◽  
Author(s):  
Hooshang Heshmat ◽  
James F. Walton ◽  
Brian D. Nicholson
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Operating Conditions ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Turbine Engine ◽  
Foil Bearings ◽  
Wide Range ◽  
The U.S ◽  
Ultra High Temperature

In this paper, the authors present the results of recent developments demonstrating that ultra-high temperature compliant foil bearings are suitable for application in a wide range of high temperature turbomachinery including gas turbine engines, supercritical CO2 power turbines and automotive turbochargers as supported by test data showing operation of foil bearings at temperatures to 870°C (1600°F). This work represents the culmination of efforts begun in 1987, when the U.S. Air Force established and led the government and industry collaborative Integrated High Performance Turbine Engine Technology (IHPTET) program. The stated goal of IHPTET was to deliver twice the propulsion capability of turbine engines in existence at that time. Following IHPTET, the Versatile Affordable Advanced Turbine Engines (VAATE) program further expanded on the original goals by including both versatility and affordability as key elements in advancing turbine engine technology. Achieving the stated performance goals would require significantly more extreme operating conditions including higher temperatures, pressures and speeds, which in turn would require bearings capable of sustaining temperatures in excess of 815°C (1500°F). Similarly, demands for more efficient automotive engines and power plants are subjecting the bearings in turbochargers and turbogenerators to more severe environments. Through the IHPTET and VAATE programs, the U.S. has made considerable research investments to advancing bearing technology, including active magnetic bearings, solid and vapor phase lubricated rolling element bearings, ceramic/hybrid ceramic bearings, powder lubricated bearings and compliant foil gas bearings. Thirty years after the IHPTET component goal of developing a bearing capable of sustained operation at temperatures above 540°C and potentially as high as 815°C (1500°F) recent testing has demonstrated achievement of this goal with an advanced, ultra-high temperature compliant foilgas bearing. Achieving this goal required a combination of high temperature foil material, a unique elastic-tribo-thermal barrier coating (KOROLON 2250) and a self-adapting compliant configuration. The authors describe the experimental hardware designs and design considerations of the two differently sized test rigs used to demonstrate foil bearings operating above 815°C (1500°F). Finally, the authors present and discuss the results of testing at temperatures to 870°C (1600°F).

Dynamic Stiffness and Damping of Foil Bearings for Gas Turbine Engines

1993 ◽  
Author(s):  
Walter L. Meacham ◽  
R. M. Fred Klaass ◽  
Ron Dayton ◽  
Ed Durkin
Keyword(s):  
Gas Turbine ◽  
Dynamic Stiffness ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Foil Bearings ◽  
Stiffness And Damping

scholarly journals APPLICATION OF PYROLYSIS GAS AS A FUEL FOR GAS TURBINE ENGINES FOR ELECTRICITY GENERATION

2021 ◽  
Vol 88 (3) ◽  
pp. 30-35
Author(s):  
Ivan Obodovskyi ◽  
Viacheslav Morozov
Keyword(s):  
Gas Turbine ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Ground Vehicles ◽  
Pyrolysis Gas ◽  
Technology Application ◽  
Marine Engines ◽  
Xix Century

Purpose: The purpose of this article is to show the opportunities of application of the pyrolysis gas as a fuel for gas turbine power plants based on decommissioned gas turbine engines, including those from aircraft – either turboprop or turboshaft, or both, and also those used on ground vehicles such as tanks and marine engines as well. Methods: The article describes the technology of pyrolysis of different materials for obtaining pyrolysis gas and its further application as a fuel for internal combustion engines was developed in the end of XIX century and was successfully applied for automobile, marine and railway locomotive piston engines till the mid ХХ century when large oil reservoirs were discovered all around the World. Results: the current research not only proves that there exists an economic benefit of application of pyrolysis technology even at nowadays, but also an ecological one, allowing getting rid of garbage Discussion: The proposed examples of successful pyrolysis technology application can be a good basis for further research of transferring modern engines to the pyrolysis gas fuels.

The ST6 Vehicular Experience

1972 ◽  
Author(s):  
G. Hardy
Keyword(s):  
Gas Turbine ◽  
High Speed ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Operating Characteristics ◽  
Design Features ◽  
Auxiliary Power

ST6 gas turbine engines in the 600-shp class have been used in many different vehicles ranging from high-speed turbo trains to Indianapolis roadsters. This experience has lead to the development of operating characteristics and design features of the engine which have improved its performance and reliability. In addition much has been learned about how to rate turbine engines and how to predict maintenance and overhaul periods in vehicular operation. This experience will be useful for future applications of turbine engines to vehicles and for design input to new turbine engines being considered for automotive use. The ST6 has proven itself well suited for prime or auxiliary power use in many types of vehicles.

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