What type of compressor uses rotating blades to compress air in a turbine engine?

The correct choice is that both axial and centrifugal flow compressors use rotating blades to compress air in a turbine engine.

In a turbine engine, compressors play a vital role in preparing the incoming air for combustion by increasing its pressure and temperature. Axial flow compressors consist of several stages, each featuring rotating blades (rotors) and stationary blades (stators). The rotating blades accelerate the air as it flows through the stages, while the stationary blades help in converting the kinetic energy into pressure. This design allows for continuous airflow and is particularly effective for high-speed and high-altitude operations.

On the other hand, centrifugal flow compressors utilize a different mechanism, employing a rotating disk with blades that move the air outward due to centrifugal force. As air enters the center of the rotating impeller, it is thrown outward and into a diffuser where its velocity is reduced, converting kinetic energy into increased pressure. This type of compressor is often found in smaller engines due to its simpler design and lower manufacturing costs.

Both compressor types rely on the principle of rotating blades to achieve air compression, making the choice encompassing both types appropriate.