RU54145U1 - FIRE PIPE OF THE COMBUSTION CHAMBER OF A GAS TURBINE ENGINE - Google Patents

Abstract

The utility model relates to the combustion chambers of gas turbine engines and can find application in turbomachinery, in particular in aircraft engine building. The technical result, which the utility model aims to achieve, is to prevent the formation of soot on the outer surface of the plate. The technical result is achieved in that the flame tube of the combustion chamber of a gas turbine engine comprises an outer and an inner wall and a front wall located between them, in which openings are made for supplying cooling air. The flame tube also contains at least one plate placed above the openings on the side of the inner surface of the front wall, having ribs on the edges adjacent to the front wall and forming a channel for the passage of cooling air.The exits from the channel are directed to the walls of the flame tube. What is new in the utility model is that at least one hole is made in the plate.

Description

The utility model relates to the combustion chambers of gas turbine engines and can find application in turbomachinery, in particular in aircraft engine building.

A heat pipe of a combustion chamber of a gas turbine engine is known [French Patent No. 2,333,126, filed June 24, 1977, IPC 7 F 23 R 3/42], comprising the outer and inner walls and the wall of the front of the flame tube located between them, in which openings for supplying cooling air are made .

The holes in the front wall of the flame tube serve to supply cooling air and create a shroud from the surface of the front walls and walls of the flame tube, which protects them from contact with hot gases. Plates are placed above the openings in the front wall, which direct cooling air to the walls of the flame tube and front.

Typical disadvantages of this device is a change in cooling efficiency due to deformation of the plates, and, accordingly, a change in air flow, both in the direction of decrease, and in the direction of increase. In addition, air flows from under the plate along its entire perimeter, including to those places where it is not necessary to create a shroud for cooling the walls, which does not allow to increase the flow of cooling air in the hottest places.

Known flame tube of the combustion chamber of a gas turbine engine [Utility Model Patent No. 49604, application. 01/11/2002, publ. 11.27.05, IPC 7 F 23 R 3/42], containing the outer and inner walls and the front wall located between them, in which holes are made for supplying cooling air. Plates are located above the holes on the side of the inner surface of the front wall, at the edges

the plates are made ribs adjacent to the front wall and forming a channel for the passage of cooling air, the exits from which are directed to the walls of the flame tube.

In this design of the flame tube, the air flow flowing under the plates takes the direction formed by the ribs and flows along the front wall to the outer and inner walls of the flame tube. Flowing along the front wall of the flame tube, the air protects it from contact with hot gases and ensures its cooling due to convective heat removal. However, during prolonged running hours of the engine, carbon deposits (coke) in the form of growths can form on the outer surface of the plate in blown places of the flame tube. Nagar (coke) periodically exfoliates and if it enters the engine path damages the turbine blades.

The technical result, which the utility model aims to achieve, is to prevent the formation of soot on the outer surface of the plate.

The technical result is achieved in that the flame tube of the combustion chamber of a gas turbine engine comprises an outer and an inner wall and a front wall located between them, in which openings are made for supplying cooling air. The flame tube also contains at least one plate located above the holes on the side of the inner surface of the front wall, having edges on the edges adjacent to the front wall and forming a channel for the passage of cooling air. The exits from the channel are directed to the walls of the flame tube.

What is new in the utility model is that at least one hole is made in the plate.

The accompanying drawings show:

Figure 1 - section of the flame tube with a plate fixed to it;

figure 2 is a section along B-B.

The flame tube of the combustion chamber of a gas turbine engine (Fig. 1) contains an outer 1 and an inner 2 wall, a front wall 3 in which openings 4 are made for supplying cooling air. Above the holes 4 from the side of the inner surface of the wall of the front 3 is a plate 5. At the edges of the plate 5, ribs 6 are made adjacent to the inner surface of the wall of the front 3 (Fig. 2). The ribs 6 form a channel 7 for the passage of cooling air, the outlet 8 of which is directed to the outer wall 1 of the flame tube, and the outlet 9 to the inner wall 2 (Fig. 1).

On the wall of the front 3 (figure 1, 2) under the plate 5 can be made several holes 4.

One or more holes 10 can also be made in the plate 5.

The operation of the device is as follows. Air for cooling the walls of the flame tube passes through openings 4 in the wall of the front 3 under the plate 5. The cooling of the plates 5 is due to the impact of air on them. Under the plates 5, the air flow takes the direction formed by the channel 7 and flows out of it through the outlets 8 and 9 along the front wall 3 to the outer 1 and inner 2 walls of the flame tube. Flowing along the front wall 3 of the flame tube, air protects it from contact with hot gases. In addition, due to the flow along the front wall 3, the air provides its cooling due to convective heat removal.

To create a protective air curtain on the outer surface of the plate 5 from the side of the hot gases, one or more holes 10 are made in the plate, communicating between each other the channel 7 and the inner cavity 11 of the flame tube.

The presence of holes 10 in the plate 5 helps to cool the outer surface of the plate 5 with air entering through the holes 10 from the channel 7 formed by the ribs 6 of the plate 5. In addition, this air

blows away carbon deposits from the plate, which prevents it from entering the engine path and damage to the turbine blades.

A similar device is currently undergoing tests, the results of which confirm the claimed properties.

Claims (1)

A heat pipe of a combustion chamber of a gas turbine engine, comprising an outer and an inner wall and a front wall located between them, in which openings are made for supplying cooling air, and at least one plate located above the openings on the side of the inner surface of the front wall and having ribs at the edges, adjacent to the front wall and forming a channel for the passage of cooling air, the exits from which are directed to the walls of the flame tube, characterized in that at least one hole is made in the plate vie.