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2

I know that air goes into the compressor as the first step of the journey From the way you mention this phrase it sounds like you have a slight misunderstanding of how a jet engine works. As your confusion illustrates. Air does not just "flow" unless there is a pressure difference. A pressure difference can be created by several means: atmospheric ...


3

High pressure air is used to turn an air starter inside the engine. That starter is connected to the inner shaft of the engine via gearbox. The source of the high pressure air can be several things: The auxiliary power unit (APU), a small gas-turbine engine in the tail of the airplane which itself is started with an electric motor A ground air starter, a ...


8

Inside some jet engines there is a powerful electric motor that starts the engine by spinning the compressor up to speed, at which point the fuel flow and the ignition spark are turned on, and the resulting combustion then forces the turbine to spin. The turbine's power output is sent to the compressor stage to spin it, and the electric start motor can then ...


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