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Air film hole based on secondary flows of bent passage

A technology of curved channels and air film holes, applied in the field of air film holes, can solve the problem of no secondary flow utilization

Inactive Publication Date: 2014-08-20
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 high-temperature airflow is bent, the central angle B of the curved channel section 4 ranges from 10° to 60°, and the radius of curvature R of the axis of the curved channel section 4 is greater than ...

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Abstract

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. The air film hole includes two parts: a curved channel section and a straight channel section; wherein, the curved channel section is a circular arc formed by bending the inlet of the air film hole toward the incoming flow of the cooling airflow. The air film produces a secondary flow of the cooling airflow due to the curved channel of the air film hole. After the formed channel vortex leaves the air film hole, it bends under the lateral push of the high-temperature air flow, and has the opposite helicity to the kidney-shaped vortex. After the interaction, it can inhibit the development of the kidney-shaped vortex, weaken its strength, improve the adhesion ability of the air film to the wall, and increase the cooling efficiency of the air film. On the other hand, because of the existence of the channel vortex, the cooling air flow has a higher spanwise velocity at the outlet of the air film hole, which can increase the coverage width of the air film.

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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Patent Type & Authority Patents(China)
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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