JPS5833423Y2 - gas turbine combustor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a gas turbine combustor.

FIG. 1 shows an example of a conventional gas turbine combustor, in which the body of the combustor is comprised of a plurality of cylinders 102 of different diameters, with a number of cooling air slots 104 interposed between the cylinders 102. are interconnected in stages.

The high temperature combustion gas 101 flows inside the cylindrical body 102, but since the wall surface of the cylindrical body is heated by this high temperature combustion gas 101, the cooling air 103 is passed through a large number of slots 102.
4, it is injected into a cylindrical body and film-cooled.

Therefore, by cooling in this manner, temperature non-uniformity occurs, thermal stress is generated, stress such as internal and external pressure difference and vibration is applied, but in this case, the cylindrical body 10
Since the wall surface of No. 2 becomes hot and its rigidity is weakened in terms of ladle strength, the conventional single-plate structure had the disadvantage that it was easily damaged.

The present invention was devised to solve these four conventional problems.In a gas turbine combustor of the type shown in Figs. The purpose of the present invention is to provide a completely new structure that can increase the strength of the tube and, as a means of achieving this, increase the strength of the cylindrical body while at the same time increasing the cooling effect of cooling air.

The present invention proposes that in a plurality of cylindrical bodies constituting the combustor side of a gas turbine combustor of the type shown in FIG. Since a structure that is strong against bending is required, a plurality of wavy protrusions extending in the circumferential direction and the axial direction are formed on the outer wall surface of the cylinder to increase its strength.

Further, according to the present invention, these wavy protrusions are formed on the outer wall surface of the cylindrical body so that the inner wall surface of the cylindrical body becomes a recessed portion.

Therefore, according to such a configuration, the cooling air flowing into the cylindrical body that is the combustor body from the many slots can be expanded once in the inner recess of the corrugated protrusion, and then further spread over the entire surface. This makes it possible to obtain a more uniform film cooling effect, and at the same time, the wavy protrusions on the outer surface of the cylinder have the effect of promoting turbulent flow of cooling air, increasing the heat transfer coefficient and improving the cooling effect. It is possible to obtain the effect of increasing

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 2, a plurality of cylindrical bodies 202 of different diameters constituting the body of the combustor are interconnected in a stepwise manner with a number of cooling air slots 204 interposed therebetween, as is conventional. However, according to the present invention, a plurality of wavy protrusions 20 extending in the circumferential direction and the axial direction are provided on the outer wall surface of the cylindrical body 202.
5 is formed so that the inner wall surface of the cylindrical body becomes a recess.

Therefore, according to such a configuration, the high temperature combustion gas 2
01 flows inside the cylinders 202, and in order to protect the walls of these cylinders from the high-temperature combustion gas 201, cooling air 206 flows inside the cylinders 202.
(a number of throwers as indicated by reference numeral 203) 20
The steps of injecting into the cylinder from No. 4 and film cooling are the same as in the conventional method.

Since the cylindrical body 202 is formed with a plurality of wavy protrusions 205 extending in the circumferential direction and the axial direction, the cylindrical body has high strength against vibration in the circumferential direction and bending in the axial direction. Therefore, even if it is a single plate structure, the cylindrical body has strong rigidity and will not be damaged.

Furthermore, since these wavy protrusions 205 are formed on the outer wall surface of the cylinder body 202 so that the inner wall surface becomes a recessed part, the wavy protrusions 205 flow into the cylinder body that is the combustor body from the numerous throwers 204. Since the cooling air 203 that comes is expanded once in the concave part on the inner surface of the wavy protrusion 205 and then further spread over the entire surface, a more uniform film cooling effect can be obtained. Since the wavy protrusions 205 have the effect of promoting turbulent flow of cooling air, it is possible to obtain the effect of increasing heat transfer efficiency and cooling effect.

Note that if these wavy protrusions 205 are formed to protrude toward the inner surface of the cylindrical body 202 instead of toward the outer surface, the cooling air 2
03 is likely to mix with the mainstream of the high-temperature combustion gas 201, and its cooling effect will deteriorate, which is undesirable.

[Brief explanation of drawings]

FIG. 1 shows an example of a conventional gas turbine combustor, in which a is a perspective view of a combustion cylinder portion and b is a sectional view taken along the line bb of a. FIG. 2 shows a gas turbine combustor according to the present invention, in which a is a perspective view of a combustion cylinder portion, b is a sectional view taken along the line bb of a, and C is a sectional view taken along the line C-C of a. 201... High temperature combustion gas, 202...
Cylindrical body, 203°206... Cooling air, 204.
... Slot, 205 ... Wave-shaped protrusion.

Claims (1)

[Scope of utility model registration request] The body of the combustor is composed of multiple cylindrical bodies with different diameters,
In a gas turbine combustor in which the cylinders are interconnected in stages with a number of cooling air slots interposed between them, the outer wall surface of the cylinders has a plurality of corrugated protrusions extending circumferentially and axially. A gas turbine combustor characterized in that an inner wall surface of the cylindrical body is formed as a recess.