Engine stall and distortion suppression system

A method of equalizing the air pressure in a turbine engine air inlet, said method comprised of:

• a) providing a modulating plenum adjacent to and surrounding said turbine engine air inlet, said plenum filled with air;
• b) separating said modulating plenum from said turbine engine air inlet with a wall;
• c) providing the wall with a plurality of perforations, wherein at least one perforation is canted radially, for permitting air flow between said modulating plenum and said turbine engine air inlet the plurality of perforations further being circumferentially spaced about a longitudinal axis of said plenum thus forming at least one ring of perforations;
• d) regulating pressure of the air in said modulating plenum,
• e) providing at least one air pressure sensor in said modulating plenum to monitor the pressure inside said plenum;
• and
• f) maintaining the air pressure in said modulating plenum at a determined pressure.

An apparatus for equalizing the air pressure in a turbine engine air inlet comprising:

• a) a modulating plenum located adjacent to and surrounding the turbine engine air inlet wherein the modulating plenum is filled with air;
• b) an air pressure regulator coupled to the modulating plenum for regulating air pressure in the modulating plenum;
• c) an air pressure monitoring device coupled to the modulating plenum for monitoring the air pressure in the modulating plenum;
• d) a permissive air flow divider located between the modulating plenum and the turbine engine air inlet for defining an air flow region in the modulating plenum and an air flow region in the turbine engine air inlet wherein the air flow divider permits air flow between the air flow regions and includes a plurality of perforations, where at least one of said perforations is canted longitudinally and said perforations are circumferentially spaced about a longitudinal axis of said plenum thus forming at least one ring of perforations;
• and
• e) an air pressure maintenance system coupled to the modulating plenum for maintaining the air pressure in the modulating plenum at a determined pressure.

An apparatus for equalizing the air pressure in a turbine engine air inlet comprising:

• a) a modulating plenum located adjacent to and surrounding the turbine engine air inlet wherein the modulating plenum is filled with air;
• b) an air pressure regulator coupled to the modulating plenum for regulating air pressure in the modulating plenum;
• c) an air pressure monitoring device coupled to the modulating plenum for monitoring the air pressure in the modulating plenum;
• d) a permissive air flow divider located between the modulating plenum and the turbine engine air inlet for defining an air flow region in the modulating plenum and an air flow region in the turbine engine air inlet wherein the air flow divider permits air flow between the air flow regions and includes a plurality of perforations, where at least one of said perforation is canted radially and said perforations are circumferentially spaced about a longitudinal axis of said plenum thus forming at least one ring of perforations;
• and
• e) an air pressure maintenance system coupled to the modulating plenum for maintaining the air pressure in the modulating plenum at a determined pressure.