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One of the functions of a gas turbine engine subsonic intake is to…

  • A
    increase airflow velocity.
  • B
    increase total pressure.
  • C
    decrease static temperature.
  • D
    decrease airflow velocity.

Refer to figure.
The intake geometry is designed to take full advantage of the ram effect. It captures the required air mass flow and delivers it to the compressor at the correct design speed. That’s why the intake is slightly divergent in order to reduce the airflow’s velocity and increase the static pressure just before the fan and compressor’s first stages. Caution, the total pressure will remain constant, it is only a trade of dynamic pressure for static pressure. This geometry is also called the ‘pitot intake’, and it has thick, smoothly-rounded lips to prevent flow separation under any flight conditions/maneuvers.

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