Results 181 to 190 of about 14,569 (237)
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Turbofan-engine noise suppression.
Journal of Aircraft, 1968Program 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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2021
In the last chapter, the turbojet engine was discussed in detail. Historically, commercial aviation began toward the end of World War II with propeller-driven planes. It soon became apparent that the flight speeds of the propeller planes were limited to low subsonic values. The use of the gas turbine engine in combination with a propulsion nozzle, i.e.,
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In the last chapter, the turbojet engine was discussed in detail. Historically, commercial aviation began toward the end of World War II with propeller-driven planes. It soon became apparent that the flight speeds of the propeller planes were limited to low subsonic values. The use of the gas turbine engine in combination with a propulsion nozzle, i.e.,
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Water-Augmented Turbofan Engine
Journal of Hydronautics, 1968This 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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Thermodynamic Analysis of Turbofan Engine
Volume 1: Turbo Expo 2005, 2005The 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 +2 more
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Fan Noise from Turbofan Engines
Journal of Aircraft, 1976This paper reviews turbomachinery noise from turbofan engines as typified by fan noise. The mechanisms and theories of fan noise are reviewed and concepts for its reduction, including acoustic suppression, are discussed. Correlations of the overall noise data from several full-scale fans tested at NASA Lewis Research Center are presented as indicative ...
Charles E. Feiler, E. William Conrad
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Distributed Control of Turbofan Engines
45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009Abstract : 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 +6 more
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Compound cycle turbofan engine
19th Joint Propulsion Conference, 1983The 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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Acoustic Thrust Estimation on Turbofan Engines
Journal of Propulsion and Power, 2023An acoustic time of flight sensor is operated across a turbofan exhaust plume and is calibrated to provide nozzle thrust in a ground-test cell. Such a sensor could potentially be used to monitor any degradation of engine performance in an on-wing application. Validation of the technique was performed on an AE3007-A1E turbofan engine. Using a pneumatic
John Gillespie +4 more
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Wear Prognostic on Turbofan Engines
Annual Conference of the PHM Society, 2013One 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 +2 more
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Gross thrust coefficient - Turbofan engines
Journal of Aircraft, 1969QL = CS(h ± X6 (2) The plenum pneumatic capacitances are based on isentropic compressibility. The pressure rates associated with the inner circular skirt plenums and the inskirt plenum, which lies between the inner circular skirts and the outer peripheral skirt, vary with vehicle motion in pitch and heave where dP/dt = (kP/V)[2Q + A(dZ/dt ± xd8/dt)] (3)
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