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A low-entropy and strong pre-swirl lap bleed air structure on a static thin-walled part of an aero-engine

A technology for aero-engines and thin-walled parts, applied to engine components, engine cooling, machines/engines, etc., can solve problems such as small wind resistance temperature rise, low cooling air flow, etc., achieve small flow loss, good cooling quality, and reduce wind resistance The effect of temperature rise

Active Publication Date: 2022-06-24
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, there is currently no bleed air structure suitable for the static thin-walled parts of the aero-engine air system, which can achieve a large enough pre-swirl to ensure a small enough windage temperature rise along the downstream of the airflow, so as to realize Use less cold air flow to ensure that the hot end parts of the engine still meet the allowable temperature requirements under extreme operating conditions

Method used

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  • A low-entropy and strong pre-swirl lap bleed air structure on a static thin-walled part of an aero-engine
  • A low-entropy and strong pre-swirl lap bleed air structure on a static thin-walled part of an aero-engine
  • A low-entropy and strong pre-swirl lap bleed air structure on a static thin-walled part of an aero-engine

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Embodiment 1

[0039] In the present embodiment, comparing the effects of the lap air-entraining structure and the round-hole air-entraining structure of the present invention, the calculation model is as follows Figure 8 As shown, the left side is the lap air bleed structure 15 of the present invention, the right side is the round hole air bleed structure 17, the fluid flows in from the inlet 14, passes through the air bleed structure on the boss on the stator thin-walled member, and finally exits from the outlet. 16 outflow.

[0040]Under the same flow rate, the same intake air temperature and a very close pressure ratio, the outlet airflow temperature in the lap bleed air structure of the present invention is 10K lower than that in the round hole bleed air structure, which can significantly reduce wind resistance. effect.

[0041] Table 1 Comparison of the effect of the lap air-entraining structure and the round-hole air-entraining structure

[0042]

[0043] from Figure 9 As can ...

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Abstract

The invention discloses a low-entropy and strong pre-rotation lapped air-inducing structure on a static thin-walled part of an aero-engine air system, which is formed by lapping a plurality of S-like lapping tiles into a full ring, and the gap between adjacent lapping tiles is A tapered bleed air channel is formed between them, and an inlet close to pure circumferential air intake is formed in the bleed air cavity. Through the technical proposal of the present invention, the overlapping air-inducing structure with a relatively large pre-swirl speed, small flow resistance loss, and reasonable air intake direction can effectively reduce the wind resistance temperature rise of the air flow in the air system, and make the air flow Maintain better cooling quality as much as possible, so as to ensure that the hot end components still meet the allowable temperature requirements under extreme working conditions.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a low-entropy and strong pre-swirl lap bleed air structure on a static thin-walled part of an aero-engine. Background technique [0002] In the secondary air system of aero-engine, the loss caused by the interaction between the fluid on the flow path and the rotating parts is called windage loss. The wind resistance loss consumes the shaft power of the turbine components and the fluid dissipates the temperature rise, thereby reducing the overall engine efficiency. How to accurately calculate and reduce the wind resistance loss has always been an important part of the optimal design of the engine air system. Modern advanced aero-engines have a wider and wider range of working conditions. Under some extreme conditions, the high-temperature airflow caused by high wind resistance may even cause the temperature of the rotating parts in the flow path to exceed the allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02C7/18F01D9/02
CPCF02C7/18F01D9/02
Inventor 邱天丁水汀赵煜王承昊袁奇雨邓长春刘传凯刘晓静
Owner BEIHANG UNIV
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