turbofan engine

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[rubenlsful]

I don´t get it:why do they heat the inside of the engine?

[mekanizmalar]

Adding heat in a closed chamber, increases the pressure. Then the energy stored in the high pressure gas used to turn the turbine, which power the propeller and the inlet compressor. If you do not add heat, the engine will not work. All the engines, whether your car engine, a truck or a power plant require heat to operate.

[manjufly]

hai I really like this animation very usefull and I would like to know what will be the power used for the initial start up like is it need any initial external power to run before it starts up

[mekanizmalar]

Hi Manjufly. Thank you for your nice comment and interest in my animations. I know working principle of this engine, but I am not knowledgeable enough to answer to the details you are asking. I am sure that someone who know this might answer.

[Sbroffotraz]

I just noticed somebody else answered your question before me, yuck!

[Sbroffotraz]

Hi manjufly! I'm no expert, but from what I understand yes, turbofan and turboprop engines require an auxiliary power unit (APU in short) that is in fact a smaller turbine, which in turn is started by an electrical engine. The APU once started is self sustaining, and aside for the main engines startup phase it works as a power backup for instrumentation, conditioning etc... Look up APU on wikipedia for further details :)

[TheWindGinProject]

I should have mentioned that smaller jets use electric power to spool up the engine. Also; if the engine was shut down in-flight then the engine could be spooled to the proper RPM by just the airspeed of the plane as long as the airspeed is high enough. A "Hot Start" will occur if fuel is introduced before the engine is rotating fast enough.

[TheWindGinProject]

Yes, the engine must be spooled up before fuel is introduced. The engine RPM can be spooled or spun up by an APU or GPU. Auxiliary or Ground Power Unit. High pressure bleed air from the external power source is used to do this. Look up Jet Engine Bleed Air and APU, GPU and maybe Jet Engine Pneumatics. If one engine is running then the other engines can be started using the operating engine’s bleed air.