Results 131 to 140 of about 818 (187)

The Emergence of the Turbofan Engine

2000
If you have looked out the window of an airplane lately, you may have noticed that jet engines are gradually getting shorter and fatter. You will see 737s, the most common airliner in service, with two types of engines of distinctly different shapes. The older models have long, stovepipe-shaped engines under the wings, where the newer ones (or older ...
George E. Smith, David A. Mindell
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Wear Prognostic on Turbofan Engines

Annual Conference of the PHM Society, 2013
One of the most evident characteristic of wear for a turbofan engine is the exhaust gas temperature (EGT). It seems clear that this temperature increases when some carbon deposits on the turbine, when the compressor efficiency diminishes so the fuel flow should increase to produce the same amount of thrust, or even when some ...
Jérôme Lacaille, Aurélie Gouby, Olivier Piol   +2 more
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Distributed Control of Turbofan Engines

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009
Abstract : The purpose of this paper is to develop control theoretic concepts for distributed control of gas turbine engines, and develop a dynamic engine model incorporating distributed components in compressor dynamics, engine cycles, and engine control.
Mehrdad Pakmehr, Marion Mounier, Nathan Fitzgerald, George Kiwada, James Paduano, Eric Feron, Alireza Behbahani   +6 more
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Thermodynamic Analysis of Turbofan Engine

Volume 1: Turbo Expo 2005, 2005
The present work deals with a detailed parametric thermodynamic analysis of all the possible configurations of turbofan engine (two and three spool with or without mixer and/ afterburner) employing transpiration cooling technique for turbine blade cooling.
R. Yadav, Chandrakant B. Jugseniya, Abhay A. Pashilkar   +2 more
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Turbofan-engine noise suppression.

Journal of Aircraft, 1968
Program for perceived noise levels reduction on ground of turbofan powered commercial transport by acoustically absorptive lining of ...
ROBERT E. PENDLEY, ALAN H. MARSH
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Effects of intercooling and recuperation on turbofan engine performance

Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology, 2011
An overall performance simulation model of the intercooled recuperative aero-engine was built, and an overall performance simulation program was developed. Then, analysis of the effects of intercooling and recuperation on the thermodynamic cycle parameters and performance parameters of the turbofan engine can be carried out.
Hao Gong, Zhan-xue Wang
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Compound cycle turbofan engine

19th Joint Propulsion Conference, 1983
The paper discusses the design and development of critical technologies for a "near-adiabatic" compound cycle turbofan engine (CCTE). The concept involves replacing the combustor of a conventional turbofan engine with a highly supercharged, high-speed, two-stroke, direct-injected diesel core. Primary emphasis was on reducing specific fuel consumption t
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Water-Augmented Turbofan Engine

Journal of Hydronautics, 1968
This paper describes a novel lightweight propulsion scheme for use in high-speed ships in which large amounts of water are injected into the fan discharge duct of an aircraft- type turbofan engine. Theoretical design and off-design performance for this water-augmented turbofan engine show that dry thrust theoretically can be augmented 380% at 25 knots ...
W. RICHARD DAVISON, THOMAS J. SADOWSKI
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Turbofan engine with reduced noise

The Journal of the Acoustical Society of America, 1998
A noise reduction kit for modifying a two (2) spool axial flow turbofan engine with multi-stage compressors and fan driven by multi-stage reaction turbines, and a thrust of at least about 18,000 lbs. at sea level. There is a fan at the upstream end of the core engine for generating axial fan air flow through bypass ducts terminating at a common nozzle,
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Takeoff characteristics of turbofan engines

Journal of Aircraft, 1990
The present derivation of reliable formulas for the takeoff characteristics of turbofan-powered aircraft, encompassing ground-roll distance and time, fuel consumption, etc, incorporates ground effect-induced drag reduction. This drag reduction factor is varied according to type of aircraft; the turbofans in question may be of high-bypass transport ...
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