How does combustion happen in a JET ENGINE?
In: Engineering
Compression plus ignition, the fans compress the air/fuel mixture and it combusts due mainly to the compression, it is more of a burn than an explosion. That turns the turbine which pulls compressed air in, which is combusted, more air comes in etc and the reaction continues until you cut the fuel out. The actual turbine is behind the compression/combustion stages, so the turbine is rotated by the rapidly expanding gases, this is connected to a shaft that turns the compressor blades in the front. Since the blades in the turbine are at an angle relative to the speeding gases, they rotate and generate torque. There is a type of jet engine called an orbiting combustion nozzle jet where the whole combustion chamber rotates with the turbine and compressor blades. The rotating energy caused by traditional jet engines is typically just lost, in this case you allow that energy to add to the torque on the shaft. The twisting power in that type of jet is both due to the expanding gases hitting the turbine fan blades *and* the rotating force caused by the combustion.
In traditional turbojets the escaping gases is the mode of propulsion, in bypass turbofans it is actually the big fan up front pushing air through the bypass.
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