... = −17.0 CAD) At the extreme ambient intake conditions for high-altitude aircraft operation, corresponding to low temperature and pressure, robust combustion is significantly inhibited by factors including increased ignition delay [ 1 – 3 ] and potential...

...Luca Menegozzo; Ernesto Benini The present paper focuses on the numerical modeling approaches adopted in boundary layer ingestion (BLI) studies. Three driving aircraft concepts have been identified, namely propulsive fuselage concept (PFC), rear engines concept (REC), and distributed fans concept...

... and aircraft applications. The unsteady flow field that disturbs the flame consists not only of the incident transverse acoustic wave, but also longitudinal acoustic fluctuations and vortical fluctuations associated with underlying hydrodynamic instabilities of the base flow. We show that the acoustic...

...Marvin Zaluski; Sylvain Létourneau; Jeff Bird; Chunsheng Yang The CF-18 (CF denotes Canadian Forces) aircraft is a complex system for which a variety of data are systematically being recorded: flight data from sensors, built-in test equipment data, and maintenance data. Without proper analytical...

...Peter Gloeckner; Klaus Dullenkopf; Michael Flouros Operating conditions in high speed mainshaft ball bearings applied in new aircraft propulsion systems require enhanced bearing designs and materials. Rotational speeds, loads, demands on higher thrust capability, and reliability have increased...

... the oil flow to the air/oil separator, however, due to the oil flow distribution the thermal effects may lead to high material temperatures and to malfunctions in the engine’s lube system. 18 02 2010 22 06 2010 12 11 2010 12 11 2010 aerospace engines aircraft computational...

...Alexandros Terzis; Charilaos Kazakos; Nikolaos Papadopoulos; Anestis Kalfas; Pavlos K. Zachos; Pericles Pilidis The penetration of a jet of fluid into a traversal moving stream is a basic configuration of a wide range of engineering applications, such as film cooling and V/STOL aircrafts...

...Gyaebyung Yang; Daejong Park; Chun Taek Kim; Sejin Kwon Hydrazine monopropellant is often used with a spontaneous catalyst a high-performance aircraft emergency power unit (EPU) and in aerospace propulsion; however, it is toxic and requires special handling. A hydrogen peroxide ( H 2 O 2 ) -based...

...Michael P. Enright; Kwai S. Chan; Jonathan P. Moody; Patrick J. Golden; Ramesh Chandra; Alan C. Pentz Fretting fatigue is a random process that continues to be a major source of damage associated with the failure of aircraft gas turbine engine components. Fretting fatigue is dominated...

... × 10 − 5 - Price CFM56 USD 6.98 6.95 5 Price Airbus A320 USD 77.17 76.9 Total maintenance $ct/ASM 2.02 2.01 6 Engine maintenance $ct/ASM 0.68 0.67 Source: Jane’s Aero Engines, 21st ed. Source: Airbus. Source: Jane’s All the World’s Aircraft...

...Michael T. Timko; Scott C. Herndon; Ezra C. Wood; Timothy B. Onasch; Megan J. Northway; John T. Jayne; Manjula R. Canagaratna; Richard C. Miake-Lye; W. Berk Knighton The potential human health and environmental impacts of aircraft gas turbine engine emissions during normal airport operation...

... , “ Decision Support for Remote Monitoring and Diagnostics of Aircraft Engine Using Influence Diagrams ,” ASME Paper No. GT2007-28331. McDonald , R. A. , 2006 , “ The Mean Subjective Utility Score, a Novel Metric for Cost-Sensitive Classifier Evaluation ,” Pattern Recogn. Lett. 0167-8655 , 27...

...M. Kelaidis; N. Aretakis; A. Tsalavoutas; K. Mathioudakis An aircraft mission analysis procedure, accounting for engine aging deterioration and incorporating emission estimation capability, is presented. It consists of three main modules: a flight simulation module, an engine performance simulation...

... Validation From Tests ,” IEEE Trans. Power Syst. 0885-8950 10.1109/59.221261 , 8 , pp. 152 – 158 . Mathworks 2005 , Simulink Manual. 15 11 2007 15 04 2008 23 06 2008 aircraft fault tolerance jet engines tracking Computer simulation is a powerful tool...

...-friction effects from the lubricant film and surfaces in contact, respectively. The test damper reproduces an aircraft application that must contain the lubricant for extended periods of time. The test damper journal is 2.54 cm in length and 12.7 cm in diameter, with a nominal clearance of 0.127 mm...

...Stefano Campanari; Giampaolo Manzolini, Research Engineer; Andrea Beretti; Uwe Wollrab In recent years, civil aircraft projects are showing a continuous increase in the demand of onboard electrical power, both for the partial substitution of hydraulic or pneumatic controls and drives...

...Jorge R. Camacho; Ahsan R. Choudhuri Buoyant and nonbuoyant shapes of methane flames issued from a 2:1 aspect ratio elliptic tube burner were measured. Nonbuoyant conditions were obtained in the KC-135 microgravity research aircraft operated by NASA’s Johnson Space Center. A mathematical model...

... aircraft gas turbines engines multivariable control systems Multivariable Controls (MVC’s) have been studied for use in aircraft gas turbine engines since the mid 1970s. The typical twin spool, afterburning turbofan engine used for most military applications exhibits coupling between a number...

...Dilip R. Ballal 07 06 2004 biographies gas turbines combustion aerodynamics ignition heat transfer sprays aerospace engines aircraft flames Professor Arthur H. Lefebvre, an ASME Fellow and a member of IGTI’s Combustion and Fuels technical committee over three...

... to find those technologies representing the best compromise between performance improvement and technology risk. Finally, a practical demonstration of the method and accompanying results is given for a typical commercial aircraft engine technology selection problem. Contributed by the International...