Rotating detonation-enabled augmentor systems
Systems and methods are provided herein useful to thrust augmentation in a gas turbine engine. In some embodiments, the systems include augmentors that incorporate a rotating detonation architecture. An exhaust system of a gas turbine engine includes an augmentor and a peripheral wall surrounding an exhaust system core. The augmentor comprises a detonation chamber disposed within the exhaust system core. The detonation chamber includes a channel formed in the peripheral wall. A core inlet path delivers a core air-fuel mixture and a pilot inlet path delivers a pilot air-fuel mixture to the detonation chamber. The core air-fuel mixture combusts in the detonation chamber along the midline the detonation chamber. The pilot air-fuel mixture detonates in the detonation chamber adjacent the peripheral wall to create a rotating detonation wave that supports the combustion reaction occurring along the midline of the detonation chamber.
1 . A rotating detonation system comprising:
a volume defined by a peripheral wall, the volume having an upstream portion that receives a core air-fuel mixture including combustion reactants and a downstream portion that releases detonation products;
a detonation chamber occupying part of the volume, wherein the detonation chamber includes a first portion and a second portion disposed along a midline of the volume in an upstream to downstream direction in axially non-overlapping arrangement, wherein, in the first portion of the detonation chamber, the peripheral wall is radially spaced a first distance from the midline and wherein, in the second portion of the detonation chamber, the peripheral wall is radially spaced a second distance from the midline that is greater than the first distance to define a channel formed in the peripheral wall, the channel extending circumferentially about the midline of the volume, wherein the channel includes a pilot inlet path configured to deliver a pilot air-fuel mixture including detonation reactants into the channel; and
a core fuel delivery system including at least one outlet disposed in a core inlet path extending along the midline of the volume upstream of the channel and configured to deliver the core air-fuel mixture to the first portion of the detonation chamber;
wherein the pilot air-fuel mixture reacts in the second portion of the detonation chamber to generate a rotating detonation combustion wave that is guided by the channel to support a combustion reaction that consumes the core air-fuel mixture within the volume, and wherein the channel defines a length in a direction along the midline that is multiple times greater than a height of the channel defined in a radial direction from the midline as a difference between the second distance and the first distance.
2 . The rotating detonation system of claim 1 , wherein the channel comprises a backward-facing step and a forward-facing step.
3 . The rotating detonation system of claim 2 , wherein the peripheral wall includes a recessed surface extending between the backward-facing step and the forward-facing step to define the channel.
4 . The rotating detonation system of claim 1 , wherein the core air-fuel mixture is supplied to the volume upstream of the detonation chamber.
5 . The rotating detonation system of claim 4 , wherein the combustion reaction occurs along the midline.
6 . The rotating detonation system of claim 1 , wherein the detonation chamber lacks a centerbody.
7 . The rotating detonation system of claim 1 , wherein the detonation chamber is unobstructed from the midline to the peripheral wall.
8 . The rotating detonation system of claim 1 , wherein the detonation chamber has a non-circular cross-sectional area.
9 . The rotating detonation system of claim 1 , further comprising a pilot fuel delivery system in fluid communication with the pilot inlet path.
10 . The rotating detonation system of claim 9 , wherein the core fuel delivery system delivers a first fuel to the core inlet path to create the core air-fuel mixture; and
wherein the pilot fuel delivery system delivers a second fuel to the pilot inlet path to create the pilot air-fuel mixture.
11 . The rotating detonation system of claim 10 , wherein the detonation chamber includes a pilot detonation zone adjacent the peripheral wall and a core reaction zone that extends along the midline of the volume, and wherein the pilot air-fuel mixture reacts in the pilot detonation zone and the core air-fuel mixture reacts in the core reaction zone.
12 . The rotating detonation system of claim 10 , wherein the rotating detonation combustion wave propagates from the peripheral wall to consume at least a portion of the core air-fuel mixture.
13 . The rotating detonation system of claim 10 , wherein the detonation chamber further includes an igniter operable to ignite the core air-fuel mixture.
14 . The rotating detonation system of claim 1 , further comprising:
an exhaust nozzle positioned downstream of the detonation chamber, wherein the exhaust nozzle is at least one of a converging/diverging nozzle or a variable area nozzle.
15 . A method comprising:
supplying the core air-fuel mixture to the detonation chamber of the rotating detonation system of claim 1 ;
supplying the pilot air-fuel mixture to the detonation chamber;
igniting the pilot air-fuel mixture in the detonation chamber to create the rotating detonation wave, wherein the rotating detonation wave consumes the core air-fuel mixture to support the combustion reaction within the detonation chamber; and
stabilizing the rotating detonation wave via the channel formed in the peripheral wall.
16 . The method of claim 15 , wherein at least a portion of the core air-fuel mixture is supplied along the midline of the volume.
17 . The method of claim 15 , further comprising supplying at least a portion of the pilot air-fuel mixture to the channel.
18 . The method of claim 15 , further comprising:
supplying a first fuel to core air flow of an engine to create the core air-fuel mixture; and
supplying a second fuel to fan bypass air flow of the engine to create the pilot air-fuel mixture.