Full Sized Jet Engines

[asal]

Sir Frank Whittle was an English aviation engineer and pilot, the son of a mechanic, Frank Whittle joined the Royal Air Force or RAF as an apprentice. He joined an RAF fighter squadron in 1928 and became a test pilot in 1931. The young RAF officer was only 22 when he first thought to use a gas turbine engine to power an airplane. While often regarded as the father of modern jet propulsion systems, the young Frank Whittle tried without success to obtain official support for study and development of his ideas. He had to persist his research on his own initiative and received his first patent on turbojet propulsion in January 1930.
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[vini006]

The technique utilizes laser-induced emission from thermographic phosphors for, non-intrusive, remote temperature diagnostics in combustion applications. A phosphor material having suitable temperature sensitivity in the expected temperature range was applied to the surface of interest in the engine afterburner. Such environment is of course very challenging (Fig 2) for any advanced measurement technique and bringing in highly sensitive equipment such as lasers definitely requires certain precautions.
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[RDRI555]

The russians had a pretty cool solution for problems like this on their Mig29 backfire bombers.
Now russian military airports are messy (and I mean like chunk and rusting aircraft rotting away on runways, oil, animals, etc. The russian reasoning behind that is: In war you can not always expect to have a perfectly clean airport.
So the Mig29 had air intakes opening towards the top for take offs and landings. The main air intakes are closed up for that time. Once the plane has gained hight, they open the vents. There is still a small risk, but that gets smaller the higher the plane flies.
I am not sure how applicable that would be for conventional planes though, since their air intakes are much larger (for fuel efficiency reasons).

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[season31]

   According to Jack Horton the Loudmouth was a  turbine because it met the requirement of reacting to a current of fluid, which is subjected to pressure-in this case, high temperature, high pressure, high velocity gases. A turbine blade or impeller does not necessarily have to be metallic.  It could be steel, wood, or plastic.  In the case of this free piston engine, the spinning impeller is gaseous, when the powerful gas exhaust reaches the special nozzle, it creates a vortex causing its gases to spin at high speed, which is similar to a modern turbine impeller.  Its high powered thrust is achieved because of the vortex phenomenon of spinning gases.
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[season331]

#
smogthemog I don't think you realise how lucky you where there mate, you could have easily been seriously injured or even killed. These are not toys and demand a very high degree of respect. NEVER stand on the axis of a spinning turbine/compressor wheel! I hope you? build many more engines but PLEASE do it safely )
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[singam]

That's a really cute question with a complex answer. That was probably the flight engineers calculation of EPR (Engine Pressure Ratio). It would be a ratio of suck to blow but many factors are involved.
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[kanmani]

Good responses above. Not all engines include constant speed drives (CSDs) however. Some engines drive the generator directly and use a voltage regulator to maintain proper power to the aircraft. In this case, the gearbox is driven by a bevel gear on the HP shaft through a smaller, perpendicular, accessory drive shaft to an external gearbox, which then uses a series of bevel and spur gears to reduce the speed by roughly an order of magnitude to several accessories, including a starter/generator, hydraulic pump, oil pump, fuel control, etc. By the time the speed reduction occurs, there is not much difference between flight idle and max speed at the generator pad, so a CSD is just added weight for little justification.


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[singam]

All jet engines, which are also called gas turbines, work on the same principle. The engine sucks air in at the front with a fan. A compressor raises the pressure of the air. The compressor is made up of fans with many blades and attached to a shaft. The blades compress the air. The compressed air is then sprayed with fuel and an electric spark lights the mixture. The burning gases expand and blast out through the nozzle, at the back of the engine. As the jets of gas shoot backward, the engine and the aircraft are thrust forward.

The image below shows how the air flows through the engine. The air goes through the core of the engine as well as around the core. This causes some of the air to be very hot and some to be cooler. The cooler air then mixes with the hot air at the engine exit area.
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[rockback]

I am not sure how applicable that would be for conventional planes though, since their air intakes are much larger (for fuel efficiency reasons).