SU973892A1 - Annular combustion chamber front device - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to aircraft engine-building, in particular to front-line devices, mainly annular combustion chambers,

A front-end device is known, comprising burners made in the form of an annular box-shaped collector with a perforated end wall for supplying gaseous fuel to the combustion zone of Cl.

However, the known device ensures that the chamber functions only on gaseous fuel, which limits its scope.

The closest to the invention to the technical essence is the front device of the annular combustion chamber, which contains at least two annular blade swirlers, located between them a collector of gaseous fuel with concentric lateral, front and perforated rear end walls and a liquid fuel nozzle z.

However, the well-known front-end device does not have sufficiently high performance.

The aim of the invention is to improve the performance.

This goal is achieved by the fact that the rear end wall of the collector is displaced relative to the exit section of the swirlers and forms with the side walls open to

To the combustion cavity, the nozzles are installed in the latter and are located at a distance of 0,, 9 from the height of the collector from the cutoff of the outlet section of the swirlers.

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In addition, holes are made in the inner side wall, and a cavity is made in the front end wall of the collector.

The drawing shows the proposed device, a longitudinal section.

Claims (2)

The front device contains two annular blade swirlers 1 and 2, between which there is a collar lecturer 3 of gaseous fuel, having concentric side walls C, front and perforated back end walls 5 and 6, respectively. The rear end wall 6 of the collector 3 is displaced relative to the exit section of the swirlers 1 and 2 and forms, with the side walls k, a cavity 7 open to the combustion zone, in which the liquid fuel nozzles 8 are located away from the cut of the output section of the swirlers 1 and 2 by a distance equal to 0.7-0.9 from the height h of the collector 3. In addition, in the inner side wall k there are holes 9 h in the front end wall 5 of the collector, a cavity 10 can be made to supply liquid fuel to the nozzles 8. When the front device is working hriteli 1 and 2 into the compressed air which at the outlet of the last forms a recirculation zone. Simultaneously with the entry of air into the recycle zone, both liquid and gaseous fuels are supplied (in the main mode of operation of the device). The gaseous fuel enters the above zone through the perforated rear collector wall 6 of the manifold and fills the cavity 7. From the nozzles 8 into the cavity 7 serves liquid fuel that mixes with the gaseous fuel and goes beyond the limits of the collector 3. The gas that forms at the exit of the cavity 7 The mixture, wedged into the recirculation air zone, is stabilized on sections of the side walls of the collector 3 and burns. When the front-end device operates on gaseous fuel oil fuel in the injector 8 is turned off and vice versa. For the efficiency of mixing, part of the gaseous fuel from the collector 3 and part of the gas mixture from the cavity 7 leaves through the holes 9 into the inter-blade area of the swirler 2. Placing the end wall 6 at a distance E from the section of the walls 4 allows you to create a cavity 7, which is necessary for the joint preliminary mixing fuels of the two components and thereby reduce the mixing zone. Such an embodiment of the front-end device allows reducing the emission of toxic combustion products into the atmosphere by increasing the efficiency and the combustion process, as well as expanding the range of stable operation. Claims 1. Front device of the annular combustion chamber, containing at least two annular blade swirlers, located between them a collector of gaseous fuel with concentric lateral, front. and perforated rear end walls and nozzles of liquid fuel, characterized in that, in order to improve performance, the rear end wall of the collector is displaced relative to the exit section of the swirlers and forms a cavity with the side walls open to the combustion zone, and located from the exit exit section swirl sections at a distance of 0.7-0.9 of the height of the collector. 2. The device according to claim 1, about 1 t and which means that holes are made in the inner side wall. 3. The device according to claim 1, about t l and that the cavity is made in the front end wall of the collector. Sources of information taken into account during the examination 1. USSR author's certificate ff, cl. F 23 R 1 / OA, 1976. 2. For Japan No. 52-3630, class, 67 Е 2, published. 1977 /////////////////////// Y //////////////// // A / g