dual-spool gas turbine engine

An axial-flow turbine engine with two independent axial-flow compressors, each driven by its own stage(s) of turbines. The high-pressure, or N2 , compressor is speed governed by the fuel control system. The speed of the low-pressure compressor, or N1 , is not governed; it seeks its own speed as the ambient air density changes. See dual compressor.

Aviation dictionary. 2014.

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