The combustion chamber of a gas turbine engine with adjustable airflow

 

(57) Abstract:

The combustion chamber of a gas turbine engine with adjustable air distribution contains a heating pipe with Windows in the wall, overlapping placed at the location of the Windows of the movable element. The movable element is designed as a flexible tape covering the heating pipe and having at least one slit. With a system of levers with the drive connected sections of the tape, and it provides radial movement of the tape. This embodiment of the combustion chamber increases the reliability of its work and provide the desired air distribution over the length of the combustion chamber. 4 Il.

The invention relates to combustion chambers (K. C.) gas turbine engines (GTE), in particular to K. C. with adjustable airflow.

Due to stricter requirements for emissions of harmful substances GTE (carbon monoxide - CO, unburned hydrocarbons, CnHm, oxides of nitrogen (NOx) there is a need to develop K. S. low emissions of these substances. Among other solutions (steam or water in K. S.) apply the redistribution of air flow along the length of the K. C. for optimal combustion conditions over the entire operating range of modes Lenogo run K. S. reduce the air flow in the primary zone, and the high modes to prevent the formation of NOxincrease the air flow in the primary zone.

The known device K. C., which distribute air along its length (for example, patent N 4534166 USA, which use adjustable swirl device in front of K. S.; patent N 4050240, USA, in which the flame tube placed swivel belt overlapping Windows; patent N 4594848 USA where to overlapping Windows in the flame tube applied rings, movable along the axis K. S.

Closest to the camera is the combustion chamber of a gas turbine engine with adjustable airflow containing heating pipe with Windows in the wall, covered and placed in the location window movable element connected through a lever system with actuator (EP 0100135 A1, IPC 6 F 23 R 3/26, 1984).

A disadvantage of the known devices is their low reliability, since the heating of the walls of the flame tube rotatable and movable along her rings, belts or ensure tightness (when closed) that does not regulate optimal air distribution along the length of the flame tube, or if duntov due to wrinkling of the flame tube, especially when its uneven heating and thermal expansion of the flame tube and the adjustable elements.

The objective of the invention is to reduce emissions of harmful substances, improving the reliability of the device controlling the flow of air and simplifying the design.

The problem is solved due to the fact that in the combustion chamber of a gas turbine engine with adjustable airflow containing heating pipe with Windows in the wall, overlapping placed in the location window movable element connected through a system of levers to drive the movable element is designed as a flexible tape covering the heating pipe and having at least one section, with a system of levers connected sections of the tape, and it provides radial movement of the tape.

In Fig. 1 shows a longitudinal section of the combustion chamber;

in Fig. 2 shows a section of an adjustable device along a-a of Fig. 1;

in Fig. 3 shows a section of an adjustable device In Fig. 2;

in Fig. 4 shows the sealing of the controlled device, view C-C of Fig. 3.

In case 1, the combustion chamber is placed the flame tube 2 having, in addition to other, at least od is a crowded place, the ends of which are movably (pivotally) connected via a rocker arm 5, earrings 6 and rod 7 with the actuator (e.g., pneumatic, electric, etc). On the flanging (thick edges) window 3 made of the grooves 8. Before the location of the tape 4 and posted by the guide ribs 9 with 10 Windows.

The device operates as follows.

In the run mode of the CCD and low operating modes, the tape 4 is translated draft 7 through the plug 6 and the yoke 5 in the upper position (shown in Fig. 2 is shown in dashed lines). The air through the window 10 and 3 passes (bypassed) inside the flame tube, on its output, the consumption of air in the primary zone of the flame tube 2 is reduced, which creates favorable conditions for the ignition (start) and sustained combustion of fuel-air mixture in the primary zone with high combustion completeness, i.e. with a small amount of unburned CnHmand low education CO. (These modes due to low temperatures and air pressure at the entrance to K. C. nitrogen oxides are not formed.) With the increase of engine operation mode and maximum mode, the tape 4 is translated into a lower position, i.e. in contact with the flared Windows 3, providing a guaranteed fit and tightness, blocking Dosi located in the primary zone, increases Zapadnaya mixture in it. In the closed position, the tape is regulated flow of air enters the flame tube through the slots 8 for cooling the ribbon 4 and the walls of the flame tube 2 around holes 3. Given the fact that NOxformed at temperatures in excess of 1650oC, the composition of the mixture in the primary zone to provide in such a way that the temperature in the combustion zone does not exceed the above, which is achieved by selection of the areas of openings in the wall of the flame tube of the primary zone and the 3 Windows.

Thus, the use of the device with the movement of the tape 4 in the radial direction will simplify design, increase reliability and provide the desired air distribution along the length of the combustion chamber, and hence the small emissions of harmful substances in the entire range of the CCD.

The combustion chamber of a gas turbine engine with adjustable airflow containing heating pipe with Windows in the wall, overlapping placed in the location window movable element connected through a system of levers with the actuator, wherein the movable element is designed as a flexible tape covering the heating pipe and having at least one incision with systems

 

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