Traveling across the world would never be as quick or easy if it was not for innovation of powerful Jet Engines that drive the modern aircraft. Jet engines actually changed the equation during the World War II, which almost re-wrote the destiny of some of the nations. Every time you see a Boeing or an Airbus fly across the sky, you see a jet leaving a vapor trail, etching its name in clear skies.
History and Evolution:
Early Jet Engines were notorious for high fuel consumption. It was Pratt & Whitney, who put two engines in tandem with two compressors to deliver high compression with axially stacked turbines resulting in lower fuel consumption and higher power. This early age Prat & Whitney engines were also a part of Boeing 707 and Douglas DC8
The underlying principle of jet engines is propulsion. The basic jet design has a rotary air compressor working in tandem with a compressor. Over time several versions came into being.
The main parts of the jet engine are the cold section and the hot section.
The cold section components include
The hot section components include
The basic principle of operation of a jet engine is the same, varying only slightly across engine types.
On the way out the burnt gases pass through a turbine, which, in turn, drive the compressor and intake fan through a common central shaft or axle. Unlike two or four stroke engines, combustion is continuous in jet engines.
Some of the other challenges of Jet engines are compressor stall or surge, bursts of fuel flows etc that can result in visible flames in the exhaust or oil bleeding.