What happens to gas velocity in an axial compressor rotor?

In an axial compressor rotor, the gas velocity increases as it passes through the rotor due to the design and operational principles of compressors. The rotor blades impart energy to the gas, which accelerates the flow. This increase in velocity is a crucial aspect of how axial compressors function, as the kinetic energy gained by the gas contributes to the overall compression process.

As the gas moves through the rotor blades, it experiences a decrease in pressure and an increase in kinetic energy, effectively compressing the gas. The design of the rotor blades is specifically optimized to enhance this velocity increase, allowing for efficient airflow management and pressure rise within the compressor.

This principle is fundamental to the operation of axial compressors and is a key factor in their design, making it clear why the answer is that gas velocity increases within the rotor.