In a conventional two-spool turbofan engine, a low-pressure shaft connects the fan, the low-pressure compressor, and the low-pressure turbine. A second (high-pressure) shaft connects the high-pressure compressor and the high-pressure turbine. The two shafts run concentrically at different speeds while increasing the overall efficiency of the engine.
Read More Here: Why Do Modern Jet Engines Have Such Large Fans? | SimpleFlying.com
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