auxiliary air intake

blow-in doors

blow-in doorsclick for a larger image
Spring-loaded doors located in the inlet duct of some gas turbine or turbofan engines. These doors are normally closed, but they open under conditions of low speed and high engine power to permit additional air into the compressor. Blow-in doors help prevent compressor stall. Also called auxiliary air intake or takeoff shutters.
References in periodicals archive ?
1 YMJET-FI (Yamaha Mixture Jet-Fuel Injection): A fuel injection system employing an auxiliary air intake passage besides the main passage to provide an 'air assist' for more efficient mixing of the air and fuel that helps improve fuel economy in the practical use range.