... 01 2010 24 11 2010 19 07 2011 19 07 2011 cooling gas turbines jet engines thermodynamics The constant increase of the fuel price requires an optimization of the engine design tool in order to increase the efficiency and the power density of each component...

... . 24 09 2010 29 10 2010 23 06 2011 23 06 2011 blades elasticity failure (mechanical) fans jet engines stators Advanced design composite fan stators at Honeywell have encountered high amplitude vibrations during development. Sanders ( 1 ) reported the destructive...

.... The blading has transonic conditions on the suction surface of the airfoils and at the exit of the blade rows. The turbine is choked for the whole operating area to be investigated. The ITD inlet Mach number is adjusted to 0.6 and represents realistic duct inlet conditions of modern jet engines with a single...

... jet engines rotors wakes 08 07 2010 05 09 2010 24 05 2011 24 05 2011 Baseline CRP density distribution at midspan The second noise source mechanism investigated is the interaction of the front-rotor tip-vortices, represented as low density regions on the top...

... layer turbulence computational fluid dynamics jet engines turbines The range and endurance of aircraft cruising at high altitude is limited by multiple factors, including the operational efficiency of the low pressure turbine. As aircraft elevation is increased, the operational Reynolds...

... observing had different origin, began searching for another cause. 23 07 2009 27 07 2009 22 10 2010 22 10 2010 blades compressors jet engines nozzles rotors stators turbines vibrations turbines compressors wave reflections nonsynchronous blade vibrations forced...

... elasticity jet engines vehicle dynamics In many aeropropulsion applications, a relatively low fidelity engine model (i.e., without volume dynamics), which includes speed and temperature dynamics with the appropriate component performance characteristics, is adequate to design control laws...

...Marcus Hüning Gas turbines and jet engines consist of a network of connected cavities beside the main gas path called the secondary air system. These cavities, which are often surrounded by stationary and high angular speed rotating walls are exposed to varying pressure and temperature levels...

... drag fans flow simulation jet engines Mach number mass transfer nozzles numerical analysis rotors 1 An important consideration in the design of nacelles for commercial aircraft engines is the propulsion system drag at engine-out “windmill” conditions, where the fan rotor...

... negligible compared with the primary variables such as the suction ratio and extraction angle.o 07 12 2007 31 08 2008 30 06 2009 blades boundary layers channel flow combustion computational fluid dynamics cooling gas turbines heat conduction jet engines thin film devices...

... to in the research community. The case histories of two projects are given to illustrate the point: the development of the concept of “smart jet engines” and the Silent Aircraft Initiative. In addition to providing a capability to attack multidisciplinary problems, the way in which collaboration can enhance...

... thesis, Technical University Berlin, Germany. Peitsch , D. , Fiola , R. , Brodmuehler , R. , and Nielsen , A. , 1999 , “ Validation of the Booster Bleed Valve Control Logic in the New BR715 Jet Engine ,” ASME Paper No. 99-GT-60. 19 12 2007 04 02 2008 09 04 2009...

... predictions are in very good agreement with measurements. Furthermore, the computational overhead of transitional simulations is only 7% for one multigrid cycle. 11 08 2007 14 03 2008 08 04 2009 blades computational fluid dynamics flow simulation jet engines jets turbomachinery...

... ). 27 07 2006 03 04 2007 02 05 2008 blades computational fluid dynamics cooling geometry jet engines jets stereo image processing turbines velocimeters wind tunnels A film-cooling hole row consisting of seven holes of diameter d = 5 mm , with a separation...

... with a recess of 2.1 mm causes the average effectiveness magnitudes to decrease slightly as compared to a squealer depth of 4.2 mm . blades cooling gas turbines jet engines Mach number subsonic flow The concept of cooling a surface subjected to high mainstream temperatures by perforating...

... 14, AGARD-AR-182. Walsh , P. P. , and Fletcher , P. , 1998 , Gas Turbine Performance , Blackwell , London. Habrard , A. G. , 1976 , “ Characterization of Components Performance and Optimization of Matching in Jet-Engine Development ,” AGARD-LS-83, pp. 7.1 – 7.19...

... a series of accelerated deterioration tests on a General Electric J85-13 jet engine. The axial compressor was deteriorated by spraying atomized droplets of saltwater into the engine intake. The paper presents the overall engine performance deterioration as well as deteriorated stage characteristics...

...Elisabet Syverud; Lars E. Bakken This paper reports the results of a series of online water wash tests of a GE J85-13 jet engine at the test facilities of the Royal Norwegian Air Force. The engine performance was deteriorated by injecting atomized saltwater at the engine inlet. The engine...

... configurations good for high-bleed flow rates can be deleterious to the primary flow at low-bleed flow rates. Bleed off-takes on the hub and casing endwalls, part way through a jet engine compressor, remove air from the primary (core) air stream to supply the internal air system with cooling and sealing air...

...B. A. Leishman; N. A. Cumpsty; J. D. Denton In a jet engine bleed off-takes on the hub and casing endwalls, part way through the compressor, supply high-pressure air for cooling, sealing, de-icing, and aircraft cabin air applications; bleed also assists compressor operation at part-speed conditions...