Results 191 to 200 of about 14,569 (237)

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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Investigating Turbofan Engine Internal Aerodynamics

SAE Technical Paper Series, 1996
<div class="htmlview paragraph">The intent of a balanced engine design process is to satisfy all systems requirements including operability, performance and durability. Due to the complexity of the trade-off process of the various metrics it is possible that system improvements may be required after a turbofan engine enters production.
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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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ZP/LTR Control for Turbofan Engines

Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, 2000
Among the control methods which have loop transfer recovery ability, such as the LQG/LTR approach, the design of target feedback loop (TFL) is one important step of the procedure for control system design because the performance of the control system designed is limited by its TFL.
Zhengping Feng, Jianguo Sun, Qiuhong Li
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LPV MODELING OF A TURBOFAN ENGINE

IFAC Proceedings Volumes, 2005
Abstract This article describes the application of quasi-LPV modeling techniques to an industrial military turbofan engine simulator developed by Snecma Moteurs, the French aerospace propulsion company. Two approaches are used, classical Jacobian linearization and velocity based linearization. First, we present briefly the theoretical aspects of both
Luc Reberga, Didier Henrion, Jacques Bernussou, Florian Vary   +3 more
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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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Research Related to Turbofan Engines

Theoretical and Natural Science
The development of aerospace technology has become a topic of daily concern and discussion for the benefit of all mankind. As the global temperature rises, the living environment of human beings is threatened, and scientists have decided to work on the development of aerospace technology in order to solve this problem and meet people's needs.
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Optimum Cycle Parameters for Turbofan Engines

Volume 1A: General, 1970
This paper presents closed-form solutions for optimum compressor pressure ratio, bypass ratio and fan pressure ratio, given the turbine inlet temperature, component efficiencies and flight Mach number for a turbofan engine. In addition a simple procedure is outlined for obtaining the optimum combination of these quantities and a sample calculation is ...
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Turbine-Based Engines: Turbojet, Turbofan, and Turboramjet Engines

2016
This chapter handles turbine-based engines (turbojet, turbofan, and turboramjet). This chapter starts with historical prospective and a classification of each engine. Next, thermodynamic and performance analyses for ideal and real cycles are introduced. Turbojet engine was coinvented in the 1930s by British and German activities. Analyses of single and
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Review of thermoelectric generation for internal combustion engine waste heat recovery

Progress in Energy and Combustion Science, 2022
Nicolae Vlad Burnete, Florin E Mariasiu, Istvan Barabas   +2 more
exaly