Double-layer-wall heat insulation screen used for afterburner

An afterburner and double-wall technology, applied in combustion chambers, continuous combustion chambers, combustion methods, etc., can solve the problems that the cooling potential of the cold air cannot be fully utilized, the cooling efficiency cannot be satisfied, and the fluidity of the cold air is poor, so as to improve Effects of air-conditioning utilization, reduction of heat load and gas flow loss, and improvement of life and reliability

Inactive Publication Date: 2014-08-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the divergent cooling heat shield structure has spoiler columns to enhance the heat exchange on the cold air side, the fluidity of the cold air is po

Method used

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  • Double-layer-wall heat insulation screen used for afterburner
  • Double-layer-wall heat insulation screen used for afterburner
  • Double-layer-wall heat insulation screen used for afterburner

Examples

Experimental program
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Example Embodiment

[0021] This embodiment is a double-walled heat shield for an afterburner.

[0022] The high-temperature, high-speed, and low-pressure gas flowing out of the turbine enters the main gas duct 8 after being diffused, and is mixed with the fuel sprayed from the fuel nozzle of the afterburner and burned again to form high-temperature, high-pressure gas, mainstream high-temperature gas A The temperature can reach 2200K, which has exceeded the allowable temperature of the material, so the heat shield should be cooled.

[0023] See figure 1 , figure 2 , image 3 The double-wall heat shield of the afterburner in this embodiment includes a gas film orifice plate 1, an impingement orifice plate 2, a trapezoidal reinforced frame 3, and the gas side gas film orifice plate 1 constitutes the inner wall of the afterburner cylinder. The inner side is the main gas duct 8 of the afterburner, that is, the flow channel of the mainstream high-temperature gas A in the afterburner; the cold air side impa...

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PUM

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Abstract

The invention discloses a double-layer-wall heat insulation screen used for an afterburner. Cooling protection is formed for the wall surface of the afterburner by using an inner convection cooling mode and a gas side air film cooling mode. The double-layer-wall heat insulation screen comprises a gas side gas film hole plate, a cool air side impacting plate and a trapezoidal reinforcing frame. The gas side air film hole plate serves as the inner wall of a cylinder body of the afterburner, the inner side of the gas side air film hole plate is provided with a main gas duct of the afterburner, the cool air side impacting plate and an outer wall surface form a cool air duct, and the trapezoidal reinforcing frame is arranged between the impacting plate and the air film hole plate. The double-layer-wall heat insulation screen is formed by the impacting plate, the air film hole plate and the trapezoidal reinforcing frame. Cooling air is made to form an air film on the gas side inner wall of the heat insulation screen, and heat load and gas flow losses are reduced. In addition, composite cooling is formed through inner convection cooling and outer air film cooling of a double-layer wall, incoming heat is brought away through convection heat exchange, and the cool air utilization rate is increased. Reduction is achieved after reflection, the effect of vibration prevention is achieved, the service life of the afterburner is prolonged, and the reliability of the afterburner is enhanced.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to a double-wall heat shield for an afterburner. Especially suitable for afterburner of gas turbine engine, also suitable for main combustion chamber of gas turbine engine. Background technique [0002] The afterburner is generally used in military aviation jet engines. It is located between the turbine and the tail nozzle. It can obtain additional higher thrust by performing secondary fuel injection combustion on the gas generated in the main combustion chamber and passed through the turbine. [0003] Since the gas inlet temperature of the afterburner has reached 950-1000K, the temperature of the gas after afterburner can reach more than 2000K, and the afterburner usually works for a short time, so not only the cooling at extremely high working temperature must be considered, but also The thermal stress and thermal deformation of the cylinder material should be consi...

Claims

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Application Information

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IPC IPC(8): F23R3/00
Inventor 郭涛魏建生朱惠人
Owner NORTHWESTERN POLYTECHNICAL UNIV
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