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Air film hole based on secondary flows of bent passage

A technology of curved channel and air film hole, applied in the field of air film hole, can solve the problem of no secondary flow utilization and so on

Inactive Publication Date: 2012-01-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not make use of the secondary flow generated by the curved hole

Method used

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  • Air film hole based on secondary flows of bent passage
  • Air film hole based on secondary flows of bent passage
  • Air film hole based on secondary flows of bent passage

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Embodiment Construction

[0017] The present invention proposes a film hole based on the secondary flow of the curved channel, and the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The air film holes in the embodiment have no spanwise compound angle, but the blade type, installation position and angle applicable to the present invention are not limited by this example. The curved hole in this example can be obtained by placing the component in a magnetic field and processing it with an electron beam.

[0018] Such as figure 1 As shown, a number of air film holes are set on the air film, and the air film hole includes two parts: a curved channel section 4 and a straight channel section 5; The direction of the incoming flow of the cooling airflow is bent, the central angle B of the curved channel section 4 ranges from 10° to 90°, and the radius of curvature R of the axis of the curved channel section 4 is greater than or equal ...

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Abstract

The invention belongs to the technical field of high-temperature component cooling of an air turbine, in particular to an air film hole based on secondary flows of a bent passage, which comprises two parts: a bent passage section and a straight passage section, wherein the bent passage section is a circular arc and is formed by bending an air film hole inlet in the air flow incoming direction. Because of the bent passage of the air film hole, on one hand, cooling air flows generate secondary flowing by an air film, formed passage vortexes are bent through the transverse pushing of high-temperature air flows after leaving the air film hole, the rotation direction opposite to kidney-shaped vortexes is realized, the development of the kidney-shaped vortexes can be inhibited after the interaction, the strength of the kidney-shaped vortexes is weakened, the attaching capability of the air film to the wall surface is improved, and the air film cooling efficiency is improved. On the other hand, because of the existence of the passage vortexes, the cooling air flows have higher expansion speed at the outlet part of the air film hole, and the coverage width of the air film can be increased.

Description

technical field [0001] The invention belongs to the technical field of cooling high-temperature components of a gas turbine, and in particular relates to a gas film hole based on a curved channel secondary flow. Background technique [0002] Increasing the inlet temperature can effectively improve the output and efficiency of the gas turbine. At present, the inlet temperature of many high-thrust, high-efficiency aero-engines or high-power land-use marine gas turbines is already much higher than the allowable temperature of the metal. In order to protect the high-temperature components inside the turbine It is safe to take necessary cooling measures for it. Air film cooling is a common cooling method applied to high-temperature components of turbines. The shape of air film holes has a very important influence on the cooling effect. In order to reduce the angle at which the cooling air flow is injected, the air film hole channels generally have a certain inclination along the...

Claims

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Application Information

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IPC IPC(8): F01D5/18F02C7/18
Inventor 康顺梁俊宇王晓东孟宝宝翟丽娜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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