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Friday, 19 October 2012

Aero-engine Turbofan - Video shows simple working principles of a modern High By-pass Ratio Turbofan Aero-engine & materials working temperatures

The short video lasts about 3mns.  An we described video for main parts and working of a modern aircraft aero-engine such as those which equip the Airbus A320 family. A background must for aero-engine metallurgists ad materials students and professionals.

The interested viewer may see the air-flow which produces the aircraft thrust. This is done by accelerating the air from the front to the back of the engine largely (80%) by the large fan-propeller at the front of the engine.

The different turbines and blades and their roles within the engine are described. (The low and high pressure compressors (13 stages) which stage by stage increase the pressure as the air flows thru' them.

The combustion chamber where aircraft fuel mixed with air is burned, the high and low pressure turbines in which the hot gas pressure is reduced as they drive the compressors and propeller-fan. There are 5 stages, one high pressure and 4 low pressure. Finally we have the exhaust system.

The concentric shafts which connect the combustion area turbines to the front propeller and turbines are shown.The temperatures  in the turbine stages just before the combustion chamber reach 450°c and within the combustion chamber whose energy drives the fans reaches 1700°C .

More cf the video above.

Reference 1.

Monday, 15 October 2012

Atom probe crystallography - Review article - Materials Today

Atom probe crystallography - Review article - Materials Today

Baptiste Gault, Michael P. Moody, Julie M. Cairney and Simon P. Ringer

Gault et al. address new developments in the emerging area of atom probe crystallography.

This review addresses new developments in the emerging area of “atom probe crystallography”, a materials characterization tool with the unique capacity to reveal both composition and crystallographic structure at the atomic scale. This information is crucial for the manipulation of microstructure for the design of both structural and functional materials with optimized mechanical, electric, optoelectronic, magnetic, or superconducting properties that will find application in, for example, nanoelectronics or energy generation. The ability to extract crystallographic information from 3D atomistic reconstruction has exciting potential synergies with modern modeling techniques, blending experimental and computational methods to extend our insight.

Click here to read the Full Text

Materials Today (2012) 15(9), 378-386

This is just one of the many features the interested reader will find in Elsevier's free materials science topical subjects magazine

High Purity Cr sources for Superalloys

Energy for th Future:Phil.Trans.A-Vol. 365, N° 1853 / April 15, 2007, curtesy The Royal Soc. London

Engineered foams and porous materials: Phil Trans A. Vol 364, N° 1838 / 06 curtesy_The R Soc. Lond