A combined cooling structure for flame tube head and vortex finder

Abstract

This invention discloses a combined cooling structure for the head of a flame tube and a vortex generator, comprising: a combined cooling structure in which cooling gas adheres tightly to the inner wall of a heat shield to form a cooling gas film, and then flows to the inner wall of an inner rectifier to form a cooling gas film; and a combined cooling structure in which the inner and outer walls of a sleeve formed by the expansion section form a gas film. Cooling gas discharged from the head cooling oblique holes adheres tightly to the inner wall of the heat shield to form a cooling gas film, and then flows to the inner wall of the inner rectifier to form a cooling gas film; cooling gas discharged from the cooling holes of the contraction section, the cooling holes of the expansion section, and multiple oblique holes in the wall can adhere tightly to the inner and outer walls of the expansion section extending into the flame tube head to form a cooling gas film. Combined with the expansion section's structure where the thickness gradually decreases from the contraction section towards the heat shield, this ensures the safety of the gas film formed by the inner and outer walls of the sleeve formed by the expansion section protecting the combustion chamber space within the flame tube head. This solves the problem that the cooling gas discharged by the impact-type divergence cannot adhere tightly to the inner wall of the rectifier of the combustion chamber at the flame tube head and the inner and outer walls of the vortex generator extension section to form a protective gas film.

Description

Technical Field

[0001] This invention relates to a combined cooling structure for the head of a flame tube and a vortex generator, belonging to the field of aero-engine technology. Background Technology

[0002] The vortex generator is an important component of the combustion chamber of an aero-engine. It generates a high-speed rotating airflow at the head of the flame tube (see Chinese Patent Publication No. CN116358004A), which improves fuel atomization and promotes fuel-air mixing. At the same time, it forms a low-pressure hot recirculation zone at the head of the flame tube to ensure stable combustion. The heat load is high when the fuel burns at the head of the flame tube. Since the vortex generator is located deep in the flame tube and is easily eroded by the high-temperature combustion gas, it needs to be cooled by cooling gas.

[0003] The Chinese patent publication number CN103900070B discloses the following technology: The combustion chamber adopts a comprehensive cooling method, including impact cooling, convection cooling, and film cooling, to cool the combustion chamber wall and protect the combustion chamber. Although the cooling gas can flow from the through hole of the inner vortex to the head of the flame tube to form film cooling, there is a problem that the cooling gas discharged by the impact type cannot closely adhere to the inner wall of the shroud of the combustion chamber at the head of the flame tube and the inner and outer walls of the vortex extension section to form a film protection. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a combined cooling structure for the flame tube head and the vortex generator.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a combined cooling structure for a flame tube head and a vortex generator, comprising:

[0007] The cooling air forms a cooling film by adhering closely to the inner wall of the heat insulation screen and then flows to the inner wall of the inner rectifier to form a cooling film. The combined cooling structure consists of the inner and outer walls of the sleeve formed by the expansion section, which also form a cooling film.

[0008] Includes: a vortex generator, the outer ring of which has a horizontal section, a contraction section and an expansion section, with the contraction section connecting the horizontal section and the expansion section;

[0009] The horizontal section of the outer ring is provided with head cooling oblique holes of the oblique expansion section, and there are multiple head cooling oblique holes distributed at intervals; when the cooling air entering from the outer ring channel is obliquely sprayed out from the head cooling oblique holes, it adheres closely to the inner wall of the heat insulation screen to form an air film and flows into the inner rectifier.

[0010] The contraction section facing the horizontal section is provided with a contraction section cooling hole that is perpendicular to the contraction section. A protective cover is fixedly connected to the outside of the contraction section at the contraction section cooling hole. The protective cover has an opening facing the expansion section. Cooling gas is discharged from the contraction section cooling hole and blocked by the protective cover, forming an air film that is parallel and close to the outside of the contraction section.

[0011] The contraction section near the root of the expansion section is provided with expansion section cooling holes of the oblique expansion section. The expansion section cooling holes are distributed in multiple intervals. The cooling air discharged from the expansion section cooling holes blows towards the cooling air discharged from the contraction section cooling holes and flows closely to the outer wall surface of the oblique expansion section to form a cooling air film.

[0012] The root of the expansion section is provided with multiple inclined holes in the wall. The multiple inclined holes in the wall are distributed at intervals. The multiple inclined holes in the wall are inclined from the expansion section toward the heat insulation screen. The multiple inclined holes in the wall are tangent to the outside of the inclined expansion section. The cooling gas discharged from the multiple inclined holes in the wall merges with the gas discharged from the cooling holes of the expansion section and the cooling holes of the contraction section and adheres tightly to the outer wall surface of the inclined expansion section to form a cooling gas film.

[0013] The expansion section is a structure that gradually thins from the contraction section towards the heat insulation screen.

[0014] It also includes a heat shield, an inner shroud, and an outer shroud. The annular mounting plate outside the vortex generator is installed at the root of the heat shield at the head of the flame tube. The inner shroud is installed outside the heat shield, and the outer shroud is installed outside the vortex generator, the heat shield, and the inner shroud.

[0015] The expansion section of the vortex generator forms a sleeve that extends from the heat shield space at the head of the flame tube into the inner shroud.

[0016] The vortex generator has an outer ring channel, an inner ring channel, inner ring blades, and an outer ring blade.

[0017] The contraction section is a structure in which the horizontal section contracts with equal wall thickness towards the expansion section.

[0018] The protective cover is reinforced and connected to the contraction section by a support block.

[0019] The support block and the cooling holes of the contraction section are all distributed at multiple intervals. The cooling holes of the contraction section are installed in a staggered manner with the support block to avoid obstructing the airflow.

[0020] The cooling holes in the expansion section, the cooling holes in the contraction section, and the head cooling oblique holes are misaligned in axial projection.

[0021] The beneficial effects of this invention are as follows: the cooling gas discharged from the head cooling oblique holes forms a cooling gas film by closely adhering to the inner wall of the heat shield and then flows to the inner wall of the inner rectifier to form a cooling gas film; the cooling gas discharged from the cooling holes of the contraction section, the cooling holes of the expansion section, and the multiple oblique holes in the wall can form a cooling gas film by closely adhering to the inner and outer walls of the expansion section extending into the head of the flame tube, and combined with the expansion section having a structure that is thinner from the contraction section to the heat shield, it ensures the safety of the gas film formed by the inner and outer walls of the sleeve formed by the expansion section in the combustion chamber of the flame tube head, and solves the problem that the cooling gas discharged by the impact divergence cannot form a gas film protection by closely adhering to the inner wall of the rectifier of the combustion chamber of the flame tube head and the inner and outer walls of the vortex generator extension section. Attached Figure Description

[0022] Figure 1 This is a schematic front cross-sectional view of the vortex generator of the present invention;

[0023] Figure 2 This is a schematic diagram of the external structure of the vortex generator of the present invention;

[0024] Figure 3 This is a schematic front cross-sectional view of the vortex generator of the present invention within the flame tube head space;

[0025] In the diagram: 1-vortex generator; 111-outer ring channel; 112-inner ring channel; 113-inner ring blade; 114-outer ring blade; 11-head cooling oblique hole; 12-contraction section cooling hole; 13-expansion section cooling hole; 14-multiple oblique holes in the wall; 15-shroud; 16-support block; 17-outer ring; 171-contraction section; 172-expansion section; 18-venturi tube; 24-heat shield; 25-inner fairing; 26-outer fairing. Detailed Implementation

[0026] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0027] like Figures 1 to 3 As shown.

[0028] This application discloses a combined cooling structure for the head of a flame tube and a vortex generator, comprising:

[0029] The vortex generator 1 has an outer ring channel 111, an inner ring channel 112, an inner ring blade 113, and an outer ring blade 114. The outer ring 17 of the vortex generator 1 has a horizontal section, a contraction section 171, and an expansion section 172. The contraction section 171 connects the horizontal section and the expansion section 172. The contraction section 171 contracts with equal wall thickness from the horizontal section to the expansion section 172. The vortex generator 1 contains a venturi tube 18.

[0030] The outer ring 17 has a head cooling oblique hole 11 on the horizontal section of the oblique expansion section 172. The head cooling oblique hole 11 is a plurality of spaced-apart holes. When the cooling air entering from the outer ring channel 111 is obliquely sprayed out from the head cooling oblique hole 11, it adheres closely to the inner wall of the heat insulation screen 24 to form an air film and flows into the inner rectifier 25 to protect the heat insulation screen 24 on the inner wall of the flame tube head.

[0031] The contraction section 171, which is closer to the horizontal section, is provided with a contraction section cooling hole 12. A protective cover 15 is welded and sealed to the outside of the contraction section 171 at the contraction section cooling hole 12. The protective cover 15 has an opening facing the expansion section 172. Cooling air is discharged from the contraction section cooling hole 12 and blocked by the protective cover 15, forming an air film parallel to and closely attached to the outside of the contraction section 171. The protective cover 15 is reinforcedly connected to the contraction section 171 by a support block 16. Both the support block 16 and the contraction section cooling hole 12 are distributed in multiple intervals. The contraction section cooling hole 12 and the support block 16 are installed in a staggered manner to avoid obstructing the airflow.

[0032] The contraction section 171, located near the root of the expansion section 172, is provided with expansion section cooling holes 13 that are angled towards the expansion section 172. These expansion section cooling holes 13 are spaced apart, and their axial projection is staggered from that of the contraction section cooling holes 12 and the head cooling oblique holes 11. Cooling air discharged from the expansion section cooling holes 13 is blown towards the cooling air discharged from the contraction section cooling holes 12, guiding it to adhere closely to the outer wall surface of the angled expansion section 172, forming a cooling air film.

[0033] The root of the expansion section 172 is provided with multiple inclined holes 14 in the wall. The multiple inclined holes 14 in the wall are distributed at intervals. The multiple inclined holes 14 in the wall are inclined from the expansion section 172 to the expansion section 172. The multiple inclined holes 14 in the wall are tangent to the outside of the inclined expansion section 172. The cooling gas discharged from the multiple inclined holes 14 in the wall merges with the gas discharged from the cooling holes 13 in the expansion section and the cooling holes 12 in the contraction section and adheres tightly to the outer wall surface of the inclined expansion section 172 to form a cooling gas film.

[0034] The expansion section 172 has a structure that gradually thins from the contraction section 171 to the heat insulation screen 24, so as to achieve tight adhesion of the air film when it flows inside and outside the expansion section 172.

[0035] The sleeve formed by the expansion section 172 extends from the space of the heat shield 24 at the head of the flame tube into the inner fairing 25.

[0036] It also includes a heat shield 24, an inner shroud 25, and an outer shroud 26. The annular mounting plate outside the vortex generator 1 is installed at the root of the heat shield 24 at the head of the flame tube. The inner shroud 25 is installed outside the heat shield 24, and the outer shroud 26 is installed outside the vortex generator 1, the heat shield 24, and the inner shroud 25.

[0037] After the cooling gas enters through the outer ring channel 111 and inner ring channel 112 of the vortex generator 1, the cooling gas discharged from the head cooling oblique hole 11 forms a cooling gas film by closely adhering to the inner wall of the heat shield 24 and then flows to the inner wall of the inner rectifier 25 to form a cooling gas film, thereby cooling the combustion chamber wall space of the flame tube head. The cooling gas discharged from the cooling hole 12 of the contraction section, the cooling hole 13 of the expansion section and the multiple oblique holes 14 in the wall can form a cooling gas film by closely adhering to the inner and outer walls of the expansion section 172 that extends into the flame tube head. Combined with the fact that the expansion section 172 has a structure that gradually thins from the contraction section 171 to the heat shield 24, it ensures the safety of the combustion chamber wall space of the flame tube head by forming a gas film formed by the inner and outer walls of the sleeve formed by the expansion section 172. This solves the problem that the cooling gas discharged by the impact divergence cannot form a gas film protection by closely adhering to the inner wall of the rectifier 25 and the inner and outer walls of the vortex generator extension section of the combustion chamber head.

Claims

1. A combined cooling structure for the head of a flame tube and a vortex generator, characterized in that, include: The cooling air adheres closely to the inner wall of the heat insulation screen (24) to form a cooling air film, and then flows to the inner wall of the inner rectifier (25) to form a cooling air film. The combined cooling structure consists of the inner wall and outer wall of the sleeve formed by the expansion section (172) to form an air film. The combined cooling structure includes: a vortex generator (1), the outer ring (17) of the vortex generator (1) has a horizontal section, a contraction section (171) and an expansion section (172), the contraction section (171) is connected to the horizontal section and the expansion section (172); The outer ring (17) has a head cooling oblique hole (11) of an oblique expansion section (172) on its horizontal section, and the head cooling oblique hole (11) is a plurality of spaced-apart holes. The contraction section (171) facing the horizontal section is provided with a contraction section cooling hole (12) of the vertical contraction section (171). The contraction section (171) at the contraction section cooling hole (12) is sealed and fixedly connected with a protective cover (15). The opening of the protective cover (15) faces the expansion section (172). The contraction section (171) near the root of the expansion section (172) is provided with expansion section cooling holes (13) of the oblique expansion section (172), and the expansion section cooling holes (13) are distributed in multiple spaced intervals; The root of the expansion section (172) is provided with multiple inclined holes (14) in the wall. The multiple inclined holes (14) in the wall are distributed at intervals. The multiple inclined holes (14) in the wall are inclined from the expansion section (172) toward the heat insulation screen (24). The multiple inclined holes (14) in the wall are tangent to the outside of the inclined expansion section (172). The expansion section (172) has a structure that gradually thins from the contraction section (171) toward the heat insulation screen (24); It also includes a heat shield (24), an inner shroud (25), and an outer shroud (26). The annular mounting plate outside the vortex generator (1) is installed at the root of the heat shield (24) at the head of the flame tube. The inner shroud (25) is installed outside the heat shield (24), and the outer shroud (26) is installed outside the vortex generator (1), the heat shield (24), and the inner shroud (25). The sleeve formed by the expansion section (172) of the vortex generator (1) extends from the heat shield (24) space at the head of the flame tube into the inner shroud (25); The contraction section (171) is a structure in which the wall thickness contracts from the horizontal section to the expansion section (172); The protective cover (15) is reinforcedly connected to the contraction section (171) by a support block (16).

2. The combined cooling structure for the flame tube head and vortex generator as described in claim 1, characterized in that: The vortex generator (1) has an outer ring channel (111), an inner ring channel (112), an inner ring blade (113), and an outer ring blade (114).

3. The combined cooling structure for the flame tube head and vortex generator as described in claim 1, characterized in that: The support block (16) and the cooling holes (12) of the contraction section are distributed in multiple intervals. The cooling holes (12) of the contraction section are installed in a staggered manner with the support block (16) to avoid obstructing the airflow.

4. The combined cooling structure for the flame tube head and vortex generator as described in claim 1, characterized in that: The expansion section cooling holes (13), the contraction section cooling holes (12), and the head cooling oblique holes (11) are misaligned in axial projection.

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