At what temperature does air exit the compressor stage?

The correct answer is based on thermodynamic principles and the typical operating conditions of jet engines. In modern gas turbine engines, after the air has passed through the compressor stage and has been compressed, it naturally experiences a significant rise in temperature due to the work done on it by the compressor blades.

In many military and commercial jet engines, it is common for the exit temperature of the air after the compressor stage to fall within the range of about 300 degrees Celsius. This temperature allows for efficient combustion, which is essential for producing the thrust necessary for flight.

Air exiting the compressor stage at this temperature is preferable as it signifies an optimal balance between compression efficiency and thermal management, ensuring that the air can be effectively mixed with fuel for combustion without risking damage to engine components from excessive heat.

Higher temperatures, such as 450 degrees Celsius or 600 degrees Celsius, would generally indicate inefficiencies or operating conditions outside typical ranges for standard aircrew training and knowledge. Therefore, the most accurate representation of exiting air temperature in a functional gas turbine engine would be around 300 degrees Celsius.