US 4,726,182 AGranted

Variable flow air-fuel mixing device for a turbojet engine

Assignee501 Societe Nationale d'Etude et de Construction de Meteur d'Aviation-S.N.E.C.M.A.

InventorsGerard Y. G. Barbier, Gerard J. P. Bayle-Laboure, Pierre A. P. Bouillot, Michel A. A. Desaulty, Rodolphe Martinez

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Abstract

A system is disclosed for controlling the flow of air through the air-fuel mixing device for a turbojet engine. The system simultaneously controls the amount of air passing through turbulence generating baffles and that passing into the combustion chamber depending upon the operating conditions of the turbojet engine.

Claims8

Dependent claims

A variable flow air-fuel mixing device for a turbojet engine having a combustion chamber, air supply means and fuel injection means, comprising:

(a) a bowl shaped member interposed between the combusion chamber and the fuel injection means so as to define an air-fuel mixing zone, the bowl shaped member having a generally conical downstream portion;
(b) a skirt member associated with the bowl shaped member so as to define a generally annular space therebetween, the skirt member defining a plurality of first air inlet openings in communication with the air supply means to allow air to pass into the annular space;
(c) a plurality of air injection orifices defined by the conical downstream portion of the bowl shaped member in communication with the annular space to allow air to pass from the annular space into the air-fuel mixing zone, the air injection orifices oriented such that they extend obliquely with respect to a central axis of the bowl shaped member;
(d) first means defining a first air passage into the air-fuel mixing zone;
(e) first baffle means located in the first air passage to generate a turbulent air flow in the air-fuel mixing zone, the first baffle means comprising a plurality of baffles defining a plurality of air channels between them, each air channel having a substantially contant cross-section;
and,
(f) control means to simultaneously control the amount of air passing through the first baffle means and the air injection orifices, wherein the control means comprises:
(i) a ring member rotatably mounted about the skirt member and the first air passage means;
(ii) a plurality of first inlet orifices defined by the ring member;
(iii) a plurality of second air inlet orifices defined by the ring member;
and,
(iv) means to rotate the ring member between an open position wherein the first air inlet orifices are aligned with the air channels between the baffles and the second air inlet orifices are aligned with the first air inlet openings of the skirt member, and a restricted position wherein the first air orifices are out of alignment with the air channels between the baffles and the second air orifices are out of alignment with the first air inlet openings of the skirt member so as to restrict the flow of air therethrough.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

A variable flow air-fuel mixing device for a turbojet engine having a combustion chamber, air supply means and fuel injection means, comprising:

(a) a bowl shaped member interposed between the combusion chamber and the fuel injection means so as to define an air-fuel mixing zone, the bowl shaped member having a generally conical downstream portion;
(b) a skirt member associated with the bowl shaped member so as to define a generally annular space therebetween, the skirt member defining a plurality of first air inlet openings in communication with the air supply means to allow air to pass into the annular space;
(c) a plurality of air injection orifices defined by the conical downstream portion of the bowl shaped member in communication with the annular space to allow air to pass from the annular space into the air-fuel mixing zone, the air injection orifices oriented such that they extend obliquely with respect to a central axis of the bowl shaped member;
(d) first means defining a first air passage into the air-fuel mixing zone;
(e) first baffle means located in the first air passage to generate a turbulent air flow in the air-fuel mixing zone, the first baffle means comprising a plurality of baffles defining a plurality of air channels between them, each air channel having a substantially contant cross-section;
and,
(f) control means to simultaneously control the amount of air passing through the first baffle means and the air injection orifices, wherein the control means comprises:
(i) a ring member rotatably mounted about the skirt member and the first air passage means;
(ii) a plurality of first inlet orifices defined by the ring member;
(iii) a plurality of second air inlet orifices defined by the ring member;
and,
(iv) means to rotate the ring member between an open position wherein the first air inlet orifices are aligned with the air channels between the baffles and the second air inlet orifices are aligned with the first air inlet openings of the skirt member, and a restricted position wherein the first air orifices are out of alignment with the air channels between the baffles and the second air orifices are out of alignment with the first air inlet openings of the skirt member so as to restrict the flow of air therethrough.

9 more elements