In an axial-flow compressor, which pair forms a pressure stage?

In an axial-flow compressor, which pair forms a pressure stage?

• A. Blades and vanes
• B. Rotors and stators
• C. Discs and casings
• D. Shrouds and seals

Answer: (A)

In an axial-flow compressor, a pressure stage is created by a blade row on the rotating element and the following vane row on the stationary element. The rotor blades impart energy to the air, increasing its pressure, while the stator vanes streamline the flow and convert that energy into additional pressure by directing the flow and removing swirl. Together, the moving blades and the stationary vanes form one pressure stage, and multiple stages in series produce the overall pressure rise. The other components listed are structural or sealing elements, not the defining pair that makes a stage.

In an axial-flow compressor, a pressure stage is created by a blade row on the rotating element and the following vane row on the stationary element. The rotor blades impart energy to the air, increasing its pressure, while the stator vanes streamline the flow and convert that energy into additional pressure by directing the flow and removing swirl. Together, the moving blades and the stationary vanes form one pressure stage, and multiple stages in series produce the overall pressure rise. The other components listed are structural or sealing elements, not the defining pair that makes a stage.