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Air film cooling hole structure

A technology of air film cooling and air film hole, which is applied in the direction of supporting elements of blades, engine elements, machines/engines, etc., which can solve the problem that the cooling air flow is easy to rush into the mainstream, the high blowing ratio is easy to blow off the wall, and the exit area of ​​the cylindrical hole Small and other problems, to achieve the effect of simple structure, low price, and increase cooling efficiency

Active Publication Date: 2017-05-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the outlet area of ​​the cylindrical hole is small, the outlet velocity of the cold air is high, and it is easy to blow off the wall when the blowing ratio is high
For example, the Chinese patent No. ZL201010106756.6 discloses a structure to improve the cooling efficiency of the wall surface. The disadvantage is that if the air film hole in this patent is a round hole, when a high blowing ratio is used, the cooling air flow is easy. Rush into the mainstream, reducing cooling efficiency
In recent years, the mainstream temperature has gradually increased, the cooling efficiency of cylindrical holes is low, and the disadvantages of small coverage are becoming more and more obvious

Method used

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Embodiment 1

[0039] The air film cooling hole type structure of this embodiment (referring to Figure 1-4) comprises air film hole 1 and wall surface 2, and the outlet of air film hole is positioned at the upstream area of ​​wall surface, and described air film hole 1 comprises cylinder section 11 and expansion section 12, and one end of cylinder section is cold air inlet 13, and the cylinder section The other end is connected to one end of the expansion section, and the other end of the expansion section is the outlet 14 of the gas film hole. The expansion section 12 is composed of a middle hole 121 and two expansion holes 122, and the middle hole communicates with each expansion hole. In the top view of the wall, the two expansion holes are arranged axisymmetrically with the middle hole as the axis, that is, the outlet of the gas film hole is axisymmetric in the transverse direction of the wall, and the angle β between each expansion hole and the central axis of the middle hole is 30 °. ...

Embodiment 2

[0047] The air film cooling hole type structure of this embodiment (referring to Figure 10 ) each part composition and position relation are the same as embodiment 1, the difference is that expansion hole 122 holes are quadrangular prisms, and the angle β between each expansion hole and the central axis of the middle hole is 40 °, the expansion hole and the middle The pore diameter ratio was 0.5.

Embodiment 3

[0049] The air film cooling hole type structure of this embodiment (referring to Figure 11 The composition and positional relationship of each part of ) is the same as that of Embodiment 1, the difference is that the middle hole of the expansion section is a tapered conical hole, which can allow more cooling air to flow through the expansion holes on both sides, and can increase the lateral cooling effect of the wall surface , and due to the contraction of the middle hole, the spanwise cooling effect at the centerline of the wall will not be reduced, and the ratio of the diameter of the expansion hole to the middle hole is 0.85.

[0050] What is not mentioned in the present invention is applicable to the prior art.

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Abstract

The invention relates to an air film cooling hole structure. The air film cooling hole structure comprises air film holes and a wall surface; and outlets of the air film holes are positioned in the upstream region of the wall surface. The air film cooling hole structure is characterized in that each air film hole comprises a cylindrical section and an expansion section; one end of each cylindrical section is a cold air inlet; the other end of each cylindrical section is connected with one end of the corresponding expansion section; the other end of each expansion section is an outlet of the corresponding air film hole; each expansion section consists of a middle hole and two expansion holes; each middle hole communicates with each expansion hole; in the top view of the wall surface, the two expansion holes of each expansion section are axially symmetric along the corresponding middle hole; and an included angle beta between each expansion hole and the central axis of each middle hole is 10-40 degrees.

Description

technical field [0001] The invention relates to the technical field of film cooling of gas turbine blades, in particular to a film cooling hole structure. Background technique [0002] With the continuous improvement of the level of technological development, the inlet temperature of the gas turbine is also rising. The gas turbine blades want to work in such a harsh environment, thanks to the wide application of film cooling technology. [0003] The basic principle of film cooling is: the cooling airflow flowing out through the film hole covers the surface of the blade, and isolates the surface of the blade from the high-temperature mainstream gas, so as to achieve the effect of cooling the wall. [0004] Cylindrical cooling holes have the advantages of simple structure and easy processing, and are widely used in film cooling. However, the outlet area of ​​the cylindrical hole is small, the outlet velocity of the cold air is high, and it is easy to blow off the wall when th...

Claims

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Application Information

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IPC IPC(8): F01D5/18
CPCF01D5/186F05D2260/202
Inventor 王进田可杨历陈占秀闵春华
Owner HEBEI UNIV OF TECH
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