Which component of the compressor section helps to convert high-velocity air to pressure?

The correct choice is the compressor stator, as it plays a crucial role in the process of increasing air pressure within the compressor section of a gas turbine engine. The compressor stator consists of stationary blades that work in conjunction with the rotating compressor rotor.

As high-velocity air passes through the rotor, it gains kinetic energy. Upon reaching the stator, the high-speed air is guided through a diverging passage. The design of the stator creates a gradual increase in the cross-sectional area, which causes a decrease in the air's velocity as it expands. According to Bernoulli's principle, when the velocity of a fluid decreases, its pressure increases—this is the fundamental principle behind the operation of the stator.

In summary, the compressor stator is essential for converting the kinetic energy of high-velocity air into increased pressure, thereby facilitating effective airflow and compression within the engine. This function is vital for optimizing engine performance and efficiency. Other components, while important in their respective roles, do not specifically perform this conversion of high-velocity air to pressure in the same manner as the stator.