Accession Number : ADD013363

Title :   Mixed Flow Augmentor Incorporating a Fuel/Air Tube.

Descriptive Note : Patent, Filed 14 May 80, patented 18 Aug 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Koshoffer, John M ; Pfefferle, Richard A ; Larson, Harold A

Report Date : 18 Aug 1987

Pagination or Media Count : 10

Abstract : In a turbofan jet engine, having a circumferentially rotatable mixer segment capable of orienting the after-burner ignitors and flameholders into the path of either the exhaust gases or bypass air, a fuel-air transfer apparatus for capturing, transporting and the releasing of an enriched fuel-air concentration from the fuel spray bars, on the stationary structure of the jet engine, to the after-burner ignitors and flameholders rigidly attached at the rear of the rotatable segment of the mixer. The enriched fuel-air mixture is transported between a location of reliable fuel availability, through a region of highly turbulent gas flow and is thereafter released while still in a enriched concentration immediately upstream of the ignitors and flameholders, facilitating ignition and sustained operation of the afterburner. The transfer of the fuel-air mixture with the exhaust gases in a confining apparatus precludes the necessity for transferring fuel, by flexible attachment or other means, between the stationary jet engine structure and the rotatable segment of the mixer, upon which the ignitors and flameholders are mounted, while insuring an appropriate fuel-air mixture for ignition and operation of the after-burner.

Descriptors :   *PATENTS, *AUGMENTATION, *ENGINE FUEL SYSTEMS COMPONENTS, *TURBOFAN ENGINES, AFTERBURNERS, AIR, ENRICHMENT, EXHAUST GASES, FLAME HOLDERS, FUEL AIR RATIO, FUEL SPRAYS, FUELS, GAS FLOW, IGNITERS, IGNITION, JET ENGINES, JET FLOW, OPERATION, RELIABILITY, RODS, ROTATION, STRUCTURAL PROPERTIES, TUBES, TURBULENT FLOW

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE