Film cooling structure

a cooling structure and film technology, applied in the direction of liquid fuel engines, machines/engines, mechanical equipment, etc., can solve the problems of difficult to improve ineffective diffusion, and achieve the effect of increasing the enlarged angle and improving the average film cooling efficiency

Inactive Publication Date: 2010-02-18
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]As described above, the partition portion does not completely partition the film cooling hole in the transverse direction, and extends over the entire structural wall in a thickness direction. Therefore, it is easy to form the film cooling hole.
[0026]From the above description, according to the invention, it is possible to obtain advantages of increasing an enlarged angle of an enlarged portion and improving average film cooling efficiency.

Problems solved by technology

For this reason, there have been problems that the cooling air 5 is not effectively diffused and it is difficult to improve average film cooling efficiency.

Method used

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Embodiment Construction

[0036]A preferred embodiment of the invention will be described in detail below with reference to accompanying drawings. Meanwhile, the same reference numerals are given to common portions in each drawing, and redundant description thereof will be omitted.

[0037]A film cooling structure according to the invention is applied to a component that is disposed on a flow passage for combustion gas in a gas turbine engine. Examples of this component include a combustor liner, a turbine nozzle vane, a turbine nozzle band, a turbine rotating blade, a turbine stator blade, a turbine shroud, and a turbine outlet liner.

[0038]FIG. 2 is a perspective view of a turbine rotating blade 2 to which the film cooling structure 10 according to the invention is applied. The turbine rotating blade 2 includes a blade portion 3 that serves as a structural wall having an outer surface 12 exposed to combustion gas 1, and a base portion 4 that is used to mount the blade portion 3 on a rotor of an engine. A cooli...

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Abstract

A film cooling structure 10 includes a structural wall 11 that has an outer surface 12 exposed to combustion gas and an inner surface 13 positioned opposite to the outer surface 12, and film cooling holes 14 are formed at the structural wall 11 and introduce cooling air from the inner surface 13 toward the outer surface 12 in order to perform film cooling. The film cooling hole 14 includes an introducing portion 14a that extends to a middle position in the structural wall 11 from the inner surface 13 toward the outer surface 12, an enlarged portion 14b of which the cross-sectional area is gradually increased toward the outer surface 12 from an end of an outer surface side of the introducing portion 14a and which is opened at the outer surface 12, and a partition portion 16 that partitions the inside of the enlarged portion 14b into a plurality of spaces in a width direction of the hole perpendicular to a flow direction of the combustion gas.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field of the Invention[0002]The present invention relates to a film cooling structure that is suitable for film cooling of the surface of a component (turbine blade or the like) of a gas turbine engine.[0003]2. Description of the Related Art[0004]The efficiency of a gas turbine engine is increased as combustion gas temperature rises. However, the combustion gas heats a structural wall of a component (a combustor liner, a turbine blade, a turbine shroud, or the like), that is disposed on a flow passage for combustion gas, to high temperature. Accordingly, in order to efficiently cool the structural wall of such the component, there is employed a film cooling structure. In the cooling structure, a cooling passage is formed therein, convection cooling is performed by making cooling air flow through the cooling passage, and film cooling is performed by making the cooling air be ejected from film cooling holes onto a surface, which is exposed...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01D5/18
CPCF01D5/186F05D2250/52F05D2260/202
Inventor OHKITA, YOJI
Owner IHI CORP
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