Which two elements constitute the axial-flow compressor assembly?

The axial-flow compressor assembly is primarily made up of two key components: the rotor and the stator. The rotor consists of rotating blades that draw in air and accelerate it along the compressor's axis. As the rotor turns, it imparts kinetic energy to the air, increasing its velocity.

The stator, on the other hand, features stationary blades that play a critical role in diffusing the high-velocity air exiting the rotor. This diffusion process converts some of the kinetic energy into pressure, effectively compressing the air for further stages of the turbine engine cycle. This combination of rotor and stator allows for continuous airflow through the compressor, ensuring efficient energy transfer and compression of the air.

The other choices refer to components or concepts that do not specifically describe the assembly of an axial-flow compressor. For instance, while blades are part of the rotor and the shaft is essential for transmitting power, they do not collectively define the compressor assembly in the same structured manner as rotor and stator. Similarly, a fan and cylinder, as well as compressor and turbine, represent different parts of the engine architecture or other components, rather than specifically addressing the axial-flow compressor itself.