Which principle does a dynamic compressor operate on?

A dynamic compressor operates on the principle of using kinetic energy to increase the pressure of a gas. In this case, air is drawn into the compressor, speeded up (accelerated) by rotating blades or impellers, and then subsequently slowed down to achieve a higher pressure. This process involves the conversion of velocity (or kinetic energy) into pressure energy.

When the air is accelerated, it gains velocity. As it exits the compressor, it enters a diffuser or similar device that slows it down, causing an increase in pressure. This fundamental operation is what characterizes most dynamic compressors, such as centrifugal compressors.

The other concepts mentioned do not accurately reflect the operation of dynamic compressors. For instance, while pistons creating pressure refers to positive displacement compressors, maintaining constant velocity does not account for the compression process, and increasing air pressure through heat is more aligned with thermodynamic principles rather than the mechanical operation of a dynamic compressor.