Augmentor flameholding apparatus

Power plants – Combustion products used as motive fluid – Combustion products generator

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Details

60 3982P, 60261, F02C 300, F02K 310

Patent

active

039317072

ABSTRACT:
A flameholder for the afterburner of an aircraft gas turbine engine is provided which comprises a pair of concentric rings forming an annular flow passage therebetween which has a continuous annular inlet for receiving the gas flow from the turbine exhaust. A plurality of discrete pilot fuel jets eject pilot fuel into the passage. A plurality of flow vanes are positioned within and around the circumference of the annular flow passage in order to impart a circumferential swirl to the fuel-air mixture and thereby improve the mixing and vaporizing thereof. An igniter of the spark type is positioned downstream of the swirl vanes. The outer annular wall of the flow passage extends downstream of and diverges conically outward from the inner wall of the flow passage. An annular V-shaped gutter is secured to the downstream end of the inner wall of the annular flow passage in order to provide a stable flameholding surface. The pre-mixed, vaporized fuel recirculates into the V-gutter to provide combustion stability. A plurality of radially extending V-shaped vanes may also be secured to the downstream end of the inner annular wall of the annular flow passage in order to further spread the flame.

REFERENCES:
patent: 2546432 (1951-03-01), Darling
patent: 2964907 (1960-12-01), Toone
patent: 3540216 (1970-11-01), Quillevere et al.
patent: 3765178 (1973-10-01), Hufnagel et al.
patent: 3788065 (1974-01-01), Markowski
patent: 3800527 (1974-04-01), Marshall et al.

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