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Which statement regarding the compressor stage of a gas turbine engine is correct?

  • A

    Both the rotor and the stator increase only the speed of the airflow.

  • B

    The rotor increases the pressure and the speed of the airflow, the stator increases only the pressure.

  • C

    Both the rotor and the stator increase only the pressure of the airflow.

  • D

    The rotor increases only the pressure of the airflow, the stator increases the pressure and the speed of the airflow.

Refer to figure.
Gas Turbine Engines – Axial-Flow Compressors
The axial-flow compressor has two main elements: a rotor and a stator. The principle of the compressor stage is to convert kinetic energy into pressure (potential) energy.

A stage consists of one row of rotor blades, fastened to discs on a rotor drum, followed by a row of stator blades, which are fastened to the compressor outer casing. On both the rotor and the stator the spaces between the blades form divergent passages.

  • In the rotor, which is turned continuously at high speed by the turbine, mechanical energy is added and converted into both kinetic (velocity) energy and potential (pressure) energy.
  • Within the stator, the pressure is increased by the conversion of the kinetic energy into pressure energy - The job of the stators is to increase pressure and keep the flow from spiraling around the axis by bringing the flow back parallel to the axis.

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