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Bending truss type structure heat insulation screen for afterburner and gas film forming method

A technology of afterburner and heat shield, which is applied in the direction of combustion method, combustion chamber, continuous combustion chamber, etc., can solve the problems such as the flow resistance of the trapezoidal reinforced frame, reduce the utilization of cold air, enhance the structural performance, improve Effects on Lifetime and Reliability

Active Publication Date: 2021-10-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure can take away the incoming heat through convection heat transfer, improve the utilization rate of cold air, and has good mechanical properties. However, this structure does not consider the flow brought by the trapezoidal reinforced frame during the internal convection heat transfer process. resistance

Method used

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  • Bending truss type structure heat insulation screen for afterburner and gas film forming method
  • Bending truss type structure heat insulation screen for afterburner and gas film forming method
  • Bending truss type structure heat insulation screen for afterburner and gas film forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: as figure 1 , figure 2 , image 3 As shown, a bent truss structure heat shield for the afterburner, including a gas film orifice plate 1 for forming the inner wall of the afterburner cylinder and an impact on the outside of the gas film orifice plate 1 Orifice plate 2, the inner side of the air film orifice plate 1 is the main gas duct 8 of the afterburner, and the impact orifice plate 2 and the outer wall surface 4 of the afterburner together form a cold air duct 7; A sandwich bending truss is arranged in the cavity between the film orifice plate 1 and the impact orifice plate 2; the air film orifice plate 1, the impact orifice plate 2 and the sandwich bending truss together form a double-wall heat shield .

[0031] Air film hole 5 is provided on air film orifice plate 1; Impact hole 6 is provided on described impact orifice plate 2; A plurality of bent individual trusses 3, and the two ends of the plurality of bent individual trusses 3 are respectiv...

Embodiment 2

[0043] Embodiment 2: as image 3 , Figure 4 As shown, the present invention also provides a method for forming an air film on an air film orifice plate with a double-wall heat shield of a bent truss sandwich structure,

[0044] The part of the cooling air flow B in the cold air duct 7 is perpendicular to the impingement jet C1 of the impingement orifice plate 2, and enters between the air film orifice plate 1 and the impingement orifice plate 2 through the impingement hole 6 on the impingement orifice plate 2 the cavity between

[0045] The impact jet C1 that enters the cavity between the air film orifice plate 1 and the impact orifice plate 2 is a part of the impact jet that directly impacts and cools the inner wall of the air film orifice plate 1 to form an impact cooling air flow C3, and the other part impacts The bent single truss collides with the surface of the bent single truss to form a flow C2 around the bent single truss,

[0046] The surrounding flow C2 descende...

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PUM

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Abstract

The invention relates to a bending truss type structure heat insulation screen for an afterburner. The bending truss type structure heat insulation screen comprises an air film pore plate and an impact pore plate, wherein an afterburner main gas duct is arranged on the inner side of the air film pore plate, a cold air outer duct is jointly formed by the impact pore plate and the outer wall face of the afterburner, a plurality of bent monomer trusses arranged in a matrix are arranged in a cavity between the gas film pore plate and the impact pore plate, air film holes are formed in the air film hole plate, impact holes are formed in the impact hole plate, cooling airflow enters the cavity between the air film pore plate and the impact pore plate through the impact holes, mixed airflow formed in the cavity enters the air film holes to form airflow jet flow, air film covering on the air film plate is formed, direct contact between fuel gas and an engine force bearing structure is blocked, internal convective heat exchange is strengthened, the cold air utilization amount is reduced, the mechanical property is better, the structural performance of the double-wall heat screen is enhanced, and the service life and the reliability of the afterburner are improved.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to a double-wall structure of an afterburner and a method for forming a gas film on the double-wall. Background technique [0002] When the aero-engine is in the afterburning state, the temperature of the gas flowing through the afterburner exceeds 2000K, which has far exceeded the heat resistance limit of available high-temperature materials. Therefore, effective thermal protection must be provided for the load-bearing structure of the afterburner. [0003] Previously disclosed several afterburner heat shields, including a porous corrugated plate afterburner heat shield (US005465572A), the stretchability of its corrugated structure can effectively prevent the impact caused by the thermal deformation of the vibrating nuclear cylinder, The high-temperature gas side of the heat shield is cooled by the cooling jet through the discrete air film holes on the corrugated plat...

Claims

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Application Information

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IPC IPC(8): F23R3/00
CPCF23R3/002Y02T50/60
Inventor 白晓辉刘存良刘海涌傅松王子文
Owner NORTHWESTERN POLYTECHNICAL UNIV