CN109579052B

CN109579052B - Flame stabilizer

Info

Publication number: CN109579052B
Application number: CN201811545491.2A
Authority: CN
Inventors: 李子万
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2020-10-13
Anticipated expiration: 2038-12-17
Also published as: CN109579052A

Abstract

The invention discloses a flame stabilizer for an afterburner of an aircraft engine and the like, which comprises a jet device arranged in a main flow channel, wherein the jet device is provided with a jet orifice, and the jet orifice is in a slit shape; or the shape of the jet orifice is circular hole shape, the number of the circular hole shaped jet orifices is multiple, the multiple circular hole shaped jet orifices are divided into at least two groups, each group of the circular hole shaped jet orifices is distributed perpendicular to the main stream flow direction, and the two adjacent groups of the circular hole shaped jet orifices are distributed in a staggered way. The flame stabilizer sprays continuous jet flow along a certain angle in a main flow through the jet flow device, the jet flow forms a pneumatic barrier in the main flow, a backflow area is further formed behind the pneumatic barrier, and the backflow area can effectively stabilize flame, so the flame stabilizer is also called as a jet flow flame stabilizer. The flame stabilizer has the advantages of high temperature resistance, deformation resistance, high combustion efficiency, small pressure loss, weak infrared radiation, capability of forming a continuous, effective and stable pneumatic barrier, large backflow area, good flame stabilizing effect and wide combustion stabilizing boundary.

Description

Flame stabilizer

Technical Field

The invention relates to combustion equipment, in particular to a flame stabilizer.

Background

The flame stabilizer of the traditional aviation turbine engine afterburner generally adopts an bluff body flame stabilizer with an bluff body, such as a V-shaped bluff body flame stabilizer. Then, a suction type flame stabilizer, an evaporation type flame stabilizer, a double V-shaped flame stabilizer and a dune standing vortex flame stabilizer are developed on the basis of the V-shaped bluff body flame stabilizer. The flame stabilizer achieves flame stabilization by creating a recirculation zone in the incoming flow to reduce the incoming flow velocity, enhance air-fuel mixing, and recirculate the high temperature combustion products to continue to ignite the unburned combustible mixture in the incoming flow. The wall temperature of the existing flame stabilizer is not uniform, and the structural deformation is easy to generate; the combustion efficiency is low, the flame is long, and the length of the combustion chamber is large; the pressure loss is large under the non-stress state; the infrared radiation is strong; however, the conventional pneumatic flame stabilizer cannot form a continuous, effective and stable pneumatic barrier because of using discrete hole-shaped jet orifices to perform fluid injection, so that the backflow area of the flame stabilizer is small, the flame stabilizing effect is poor, and the combustion stabilizing boundary is narrow.

Disclosure of Invention

The invention aims to provide a flame stabilizer. The flame stabilizer has the advantages of high temperature resistance, deformation resistance, high combustion efficiency, small pressure loss and weak infrared radiation, and can form a continuous, effective and stable pneumatic barrier, so that the backflow area of the flame stabilizer is large, the flame stabilizing effect is good, and the combustion stabilizing boundary is wide.

In order to solve the technical problem, the flame stabilizer comprises a jet device arranged in a main flow channel, wherein the jet device is provided with a jet orifice, the shape of the jet orifice is in a slit shape, and the jet orifice is in a slit-shaped jet orifice; or the shape of the jet orifice is circular orifice shape, the circular orifice shape jet orifice has a plurality of, the plurality of circular orifice shape jet orifices are divided into at least two groups, each group of circular orifice shape jet orifices are distributed along the circumference or length direction of the jet device; two adjacent groups of circular hole-shaped jet ports are distributed in a staggered manner.

Further, the jet device is a jet pipe which is cylindrical, elliptic cylindrical or prismatic; the central axis of the jet pipe is parallel or vertical to the extending direction of the main flow channel; and a slit-shaped jet orifice is arranged on the side wall or the top wall of the jet pipe, and the extension direction of the length of the slit-shaped jet orifice is vertical to the extension direction of the main flow channel.

Furthermore, the jet device is a jet plate, the bottom surface and the top surface of the jet plate are provided with slit-shaped injection ports, and the extension direction of the length of each slit-shaped injection port is perpendicular to the extension direction of the main flow channel.

Further, the fluidic device comprises at least one slit-shaped jet opening; alternatively, the fluidic device comprises a plurality of circular orifice-shaped jet openings.

Further, the side wall of the jet orifice close to the top of the jet pipe is horizontally opposite to the side wall of the jet orifice far from the top of the jet pipe; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device.

Furthermore, the side wall of the jet orifice close to the top of the jet flow pipe is higher than the side wall far away from the top of the jet flow pipe, the axis direction of the jet orifice pointing to the outer wall of the jet flow device from the inner wall of the jet flow device forms an obtuse angle with the flowing direction of the main flow, and the two side walls of the jet orifice are opposite in an inclined manner; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device.

Furthermore, the side wall of the jet orifice close to the top of the jet flow pipe is lower than the side wall far away from the top of the jet flow pipe, the axis direction of the jet orifice pointing to the outer wall of the jet flow device from the inner wall of the jet flow device forms an acute angle with the flowing direction of a main flow, and the two side walls of the jet orifice are opposite in an inclined manner; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device.

Further, a flow guide structure and/or a blending structure are arranged on the jet device, and the flow guide structure and/or the blending structure are arranged inside the jet device or outside the jet device.

Further, the distance between the centers of two adjacent circular-hole-shaped ejection openings is larger than the diameter of the circular-hole-shaped ejection opening by less than twice the diameter of the circular-hole-shaped ejection opening.

Further, the flame holder comprises at least one fluidic device.

Compared with the prior art, the flame stabilizer has the following beneficial effects.

1. The technical scheme is that the flame stabilizer is adopted, and the flame stabilizer comprises a jet device arranged in a main flow channel, wherein the jet device is provided with a jet orifice, the jet orifice is in a slit shape, and the jet orifice is a slit-shaped jet orifice; or the shape of the jet orifice is circular orifice shape, the circular orifice shape jet orifice has a plurality of, the plurality of circular orifice shape jet orifices are divided into at least two groups, each group of circular orifice shape jet orifices are distributed along the circumference or length direction of the jet device; the technical means that two groups of adjacent circular hole-shaped jet orifices are distributed in a staggered manner, so that a continuous, effective and stable pneumatic barrier is formed by means of jet flow, the backflow area of the flame stabilizer is large, the flame stabilizing effect is good, the combustion stabilizing boundary is wide, the blockage ratio in a non-stress state is small, and the fluid resistance and the total pressure loss are small.

2. In the technical scheme, the jet device is a jet pipe which is cylindrical, elliptic cylindrical or prismatic; the central axis of the jet pipe is parallel or vertical to the extending direction of the main flow channel; the jet pipe is provided with a slit-shaped jet orifice on the side wall or the top wall, and the extension direction of the length of the slit-shaped jet orifice is vertical to the extension direction of the main flow channel, so that the contraction and expansion of the slit-shaped jet orifice on the jet pipe are utilized to compensate and relieve the cold and hot stress deformation, meanwhile, the jet pipe is cooled due to internal ventilation, and the pressurized gas in the jet pipe is beneficial to the mixing of gas and the stability of flame, the combustion efficiency is improved, and the infrared radiation generated due to the heating of a flame stabilizer is reduced.

3. According to the technical scheme, the jet device is used as the jet flow plate, the slit-shaped jet orifices are arranged on the bottom surface and the top surface of the jet flow plate, and the extending direction of the length of the slit-shaped jet orifices is perpendicular to the extending direction of the main flow channel, so that compared with a jet flow pipe, the jet orifices of the jet flow plate can be longer, the gas quantity jetted in unit time can be larger, and a continuous gas barrier is formed, so that the combustion stability boundary is wider, and the flame stabilization effect is better.

4. The technical proposal adopts the jet device which comprises at least one slit-shaped jet orifice; or the jet device comprises a plurality of circular-hole-shaped jet orifices, so that a proper number of jet orifices can be arranged on the jet device according to the requirement, and the backflow area is expanded by changing the distribution and the position of the jet orifices on the premise of not changing the gas pressure and the flow of combustible gas in the jet pipe, so that the flame can be more stably burnt.

5. The side wall of the jet orifice close to the top of the jet pipe is horizontally opposite to the side wall of the jet orifice far from the top of the jet pipe; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device, so that the jet speed of the jet flow can be controlled under the condition of not changing the pressure and the flow of the jet flow, the size of a backflow area and the mixing strength of fuel oil and air are controlled, the atomization and the mixing of the fuel oil are controlled, and the jet orifice is suitable for different use scenes and working conditions.

6. According to the technical scheme, the side wall of the jet orifice close to the top of the jet flow pipe is higher than the side wall far away from the top of the jet flow pipe, the axis direction of the jet orifice pointing to the outer wall of the jet flow device from the inner wall of the jet flow device forms an obtuse angle with the flowing direction of a main flow, and the two side walls of the jet orifice are opposite in an inclined manner; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device, so that the jet direction of the jet flow can be changed while the jet speed is controlled, the size and the mixing strength of a backflow area can be favorably controlled, and the jet orifice is suitable for different use scenes and working conditions.

7. According to the technical scheme, the side wall of the jet orifice, close to the top of the jet flow pipe, is lower than the side wall far away from the top of the jet flow pipe, the axis direction of the jet orifice, which points to the outer wall of the jet flow device from the inner wall of the jet flow device, forms an acute angle with the flowing direction of a main flow, and the two side walls of the jet orifice are opposite in an inclined manner; the two side walls are obliquely opposite; the jet orifice is in a convergent shape, and the width of the jet orifice is gradually reduced from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in an expanded shape, and the width of the jet orifice is gradually increased from the inner wall of the jet device to the outer wall of the jet device; or the jet orifice is in a Laval shape, and the width of the jet orifice is gradually reduced and then gradually increased from the inner wall of the jet device to the outer wall of the jet device, so that the jet direction of the jet flow can be changed while the jet speed is controlled, the size and the mixing strength of a backflow area can be favorably controlled, and the jet orifice is suitable for different use scenes and working conditions.

8. According to the technical scheme, the technical means that the flow guide structure and/or the mixing structure are arranged on the jet device and are arranged inside the jet device or outside the jet device is adopted, so that the mixing of fuel oil and combustion-supporting gas or combustible gas and combustion-supporting gas is facilitated, the combustion efficiency is improved, and the stability of flame combustion is improved.

9. The technical scheme adopts the technical means that the distance between the centers of the two adjacent circular hole-shaped jet orifices is greater than the diameter of the circular hole-shaped jet orifices and is less than twice the diameter of the circular hole-shaped jet orifices, so that a continuous, effective and stable pneumatic barrier can be formed, the backflow area of the flame stabilizer is large, the flame stabilizing effect is good, and the combustion stabilizing boundary is wide.

10. This technical scheme is owing to adopted the technical means that flame holder includes at least one fluidic device, so can use a fluidic device or a plurality of fluidic device cooperation to use alone in mainstream runner to obtain required combustion area, a plurality of fluidic device cooperations are used and are compared in using a fluidic device and can be improved combustion area, make the burning more abundant.

Drawings

A flame holder of the present invention is described in further detail below with reference to the accompanying drawings and the detailed description. The main flow direction is from left to right, unless otherwise indicated.

FIG. 1 is a schematic view of a flame holder of the present invention, wherein the injection ports are slit-shaped injection ports.

Fig. 2 is a schematic view of a flame holder of the present invention, wherein the jet device is a jet pipe, and the central axis of the jet pipe is parallel to the extending direction of the main flow channel.

Fig. 3 is a schematic view of a flame holder of the present invention, wherein the fluidic device is a jet pipe, and the central axis of the jet pipe is perpendicular to the extending direction of the main flow channel.

FIG. 3a is a schematic view of a flame holder of the present invention, wherein the fluidic device is a jet pipe, and the central axis of the jet pipe is perpendicular to the extension direction of the main flow channel; the wall of the jet pipe is provided with a plurality of slit-shaped jet orifices.

FIG. 4 is a schematic view of a flame holder of the present invention, wherein the jet device is a jet pipe and the jet orifice is a circular orifice.

FIG. 5 is a schematic view of a flame stabilizer according to the present invention, wherein the jet pipe is cylindrical, the injection ports are disposed on the side wall of the jet pipe, the jet pipe is provided with two slit-shaped injection ports, and the distance between the two injection ports is relatively large.

FIG. 6 is a schematic view of a flame holder according to the present invention, wherein the jet pipe is cylindrical, the injection ports are disposed on the side wall of the jet pipe, the jet pipe is provided with two slit-shaped injection ports, and the distance between the two injection ports is small.

FIG. 6a is a schematic view of a flame holder according to the present invention, wherein the jet pipe is cylindrical, the jet orifice is disposed on the side wall of the jet pipe, the jet orifice is in the shape of an unbroken full ring, and the pipe walls on both sides of the jet orifice are connected by an internal structure.

Fig. 6b is a partial enlarged view of the area a in fig. 6 a.

FIG. 7 is a schematic view of a flame holder according to the present invention, wherein the jet pipe is cylindrical, the injection ports are disposed on the side wall of the jet pipe, and the jet pipe is provided with four slit-shaped injection ports.

FIG. 8 is a schematic view of a flame holder of the present invention, wherein the jet pipe is cylindrical, the jet orifices are disposed on the top wall of the jet pipe, and two slit-shaped jet orifices are disposed on the top wall of the jet pipe; wherein the main flow direction is from right to left.

FIG. 9 is a schematic view of a flame holder of the present invention, wherein the jet pipe is cylindrical, the jet ports are disposed on the top wall of the jet pipe, and four slit-shaped jet ports are disposed on the top wall of the jet pipe; wherein the main flow direction is from right to left.

FIG. 10 is a schematic view of a flame holder of the present invention, wherein the jet pipe is in an elliptical cylinder shape and the jet ports are provided on the side wall of the jet pipe.

FIG. 11 is a schematic view of a flame holder of the present invention, wherein the jet pipe is in the shape of an elliptical cylinder and the jet orifice is provided on the top wall of the jet pipe; wherein the main flow direction is from right to left.

Fig. 12 is a partially enlarged view of the area a in fig. 11.

FIG. 13 is a schematic view of a flame holder of the present invention in which the jet pipe has a prism shape and the jet ports are provided on the side wall of the jet pipe.

FIG. 14 is a schematic view of a flame holder of the present invention, wherein the jet pipe has a prism shape and the jet orifice is provided on the top wall of the jet pipe; wherein the main flow direction is from right to left.

FIG. 15 is a schematic view of a flame holder of the present invention wherein the fluidic device is a jet plate having jet ports on the bottom and top surfaces thereof.

FIG. 16 is a schematic view of a flame holder of the present invention wherein the side wall of the injection orifice near the top of the jet tube and the side wall of the injection orifice away from the top of the jet tube are horizontally opposed and the injection orifice is convergent.

FIG. 17 is a schematic view of a flame holder of the invention wherein the side wall of the injection orifice near the top of the jet tube and the side wall of the injection orifice away from the top of the jet tube are horizontally opposed and the injection orifice is divergent.

FIG. 18 is a schematic view of a flame holder of the invention wherein the side wall of the injection orifice near the top of the jet tube and the side wall of the injection orifice away from the top of the jet tube are horizontally opposed and the injection orifice is in the shape of a Laval.

FIG. 19 is a schematic view of a flame holder of the present invention wherein the side walls of the injection port near the top of the jet tube are higher than the side walls of the injection port away from the top of the jet tube, the side walls are diagonally opposite and the injection port is convergent.

FIG. 20 is a schematic view of a flame holder of the present invention wherein the side walls of the injection orifice near the top of the jet tube are higher than the side walls of the injection orifice away from the top of the jet tube, the side walls are diagonally opposite and the injection orifice is divergent.

FIG. 21 is a schematic view of a flame holder of the present invention in which the side walls of the injection port near the top of the jet tube are higher than the side walls of the injection port away from the top of the jet tube, the side walls are diagonally opposite and the injection port is in the shape of a laval.

FIG. 22 is a schematic view of a flame holder of the present invention wherein the side walls of the injection orifice near the top of the jet tube are lower than the side walls of the injection orifice away from the top of the jet tube, the side walls are diagonally opposite and the injection orifice is convergent.

FIG. 23 is a schematic view of a flame holder of the present invention wherein the side walls of the injection orifice near the top of the jet tube are lower than the side walls of the injection orifice away from the top of the jet tube, the side walls are diagonally opposite and the injection orifice is divergent.

FIG. 24 is a schematic view of a flame holder of the present invention wherein the side walls of the injection orifice near the top of the jet tube are lower than the side walls of the injection orifice away from the top of the jet tube, the side walls are diagonally opposite and the injection orifice is in the shape of a Laval.

FIG. 25 is a schematic view of a flame holder of the present invention with a vane-type flow guide structure in the fluidic device.

Fig. 26 is a front view of the vane flow directing structure of fig. 21.

FIG. 27 is a schematic view of a flame holder of the invention in which two fluidic devices are disposed in the mainstream flow path.

FIG. 27a is a schematic view of a flame holder of the present invention in which a plurality of fluidic devices are disposed in a mainstream flow channel and are distributed in a circular pattern.

The reference numerals are explained below.

1. A main flow channel;

2. a fluidic device;

2-1, a jet orifice;

2-1-1, a slit-shaped jet orifice;

2-1-2, a circular orifice;

3. a reflux zone;

4. the vane type flow guide structure.

Detailed Description

As shown in fig. 1 to 27, the present invention provides a flame holder. The flame stabilizer comprises a jet device 2 arranged in a main flow channel 1, wherein the jet device 2 is provided with a jet orifice 2-1, the jet orifice 2-1 is in a slit shape, and the jet orifice 2-1 is a slit-shaped jet orifice 2-1-1; or the jet orifice 2-1 is in a circular hole shape, the jet orifice 2-1 is a circular hole-shaped jet orifice 2-1-2, the number of the circular hole-shaped jet orifices 2-1-2 is multiple, the plurality of circular hole-shaped jet orifices 2-1-2 are at least divided into two groups, and each group of the circular hole-shaped jet orifices 2-1-2 is distributed along the circumferential direction or the length direction of the jet device 2; two adjacent groups of circular hole-shaped jet ports 2-1-2 are distributed in a staggered manner.

When the length direction of the jet device 2 is parallel to the main flow direction, the circular hole-shaped jet ports 2-1-2 are distributed along the circumferential direction of the jet device 2; when the length direction of the jet device 2 is vertical to the main flow direction, the circular hole-shaped jet ports 2-1-2 are distributed along the length direction of the jet device 2. The fuel, the mixed gas of the fuel and the air, the fuel gas or the air are sprayed out from the slot-shaped spray openings 2-1-1 or sprayed out from the staggered round hole-shaped spray openings 2-1-2 to form a continuous, effective and stable pneumatic barrier, and compared with a backflow area 3 which uses discrete hole-shaped spray openings to carry out fluid spraying to generate a flame stabilizer, the backflow area 3 which generates the flame stabilizer is larger, the flame stabilizing effect is good, and the combustion stabilizing boundary is wide. Meanwhile, the injection port 2-1 effectively relieves the deformation of the structure due to the cold and hot stress through the contraction and expansion of the injection port.

As shown in fig. 2 to 14, the jet device 2 of the present embodiment is a jet pipe having a cylindrical shape (see fig. 5 to 9), an elliptic cylindrical shape (see fig. 10 to 12), or a prismatic shape (see fig. 13 and 14); the central axis of the jet pipe is parallel to the extending direction of the main flow channel 1 (see fig. 2) or perpendicular to the extending direction of the main flow channel 1 (see fig. 3); the side wall or the top wall of the jet pipe is provided with a slit-shaped jet orifice 2-1-1, and the extension direction of the length of the slit-shaped jet orifice 2-1-1 is vertical to the extension direction of the main flow channel 1.

The cylindrical jet pipe enables jet flow sprayed out of the jet pipe to form corresponding fan-shaped shapes along each side, air quantity entering a backflow area can be increased, mixing coefficients are increased, atomization and mixing of fuel oil are facilitated, pressurized gas in the jet pipe contributes to stable combustion of flame, and combustion efficiency of the fuel oil or the fuel gas can be improved. Meanwhile, the pipe wall of the jet pipe is cooled due to the ventilation in the jet pipe, and the jet pipe can work at high temperature.

As shown in fig. 15, the jet device 2 of the present embodiment is a jet plate, and slit-shaped jet ports 2-1-1 are provided on the bottom surface and the top surface of the jet plate, and the extending direction of the lengths of the slit-shaped jet ports 2-1-1 is perpendicular to the extending direction of the main flow channel 1. Compared with a jet pipe, the slit-shaped jet opening 2-1 of the jet plate can be longer, the gas quantity injected in unit time can be larger, and a continuous and wide gas barrier can be formed, so that the combustion stability boundary is wider, and the flame stabilization effect is better.

As shown in fig. 1 to 15, the jet device 2 of the present embodiment includes at least one slit-shaped jet port 2-1-1; alternatively, the fluidic device 2 comprises a plurality of circular orifice-shaped jets 2-2-2. The slit-shaped ejection opening 2-1-1 may be annular. The plurality of injection ports 2-1 can be uniformly distributed on the same circumferential direction of the jet device 2, the plurality of injection ports 2-1 can also be symmetrically or alternatively distributed on a plurality of circumferential directions of the jet device 2, and the backflow zone 3 is expanded by changing the distribution of the injection ports 2-1 on the premise of not changing the gas pressure and the flow of combustible gas in the jet pipe, so that flame can be more stably burnt.

As shown in fig. 16 to 18, the side wall of the ejection port 2-1 near the top of the jet pipe and the side wall of the ejection port 2-1 far from the top of the jet pipe are horizontally opposed to each other in the present embodiment; the jet orifice 2-1 is convergent (see fig. 16), and the width of the jet orifice 2-1 is gradually reduced from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is expanded (see fig. 17), and the width of the jet orifice 2-1 gradually increases from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is in a laval shape (see fig. 18), and the width of the jet orifice 2-1 gradually decreases from the inner wall of the fluidic device 2 to the outer wall of the fluidic device 2 and then gradually increases.

The convergent injection port 2-1 can accelerate jet flow under the subsonic speed condition, so that the backflow zone 3 is larger, the flame stabilization effect is better, the divergent injection port 2-1 is more beneficial to atomization of fuel oil and mixing of the fuel oil and air, and the laval-shaped injection port 2-1 can generate supersonic jet flow when the jet flow pressure is enough, so that the jet flow speed is further increased, the jet flow is fully expanded, and the backflow zone 3 is enlarged. The jet speed and the mixing coefficient of jet flow can be controlled by different jet ports 2-1, so that reflux zones and reflux zone residual gas coefficients with different sizes are generated, and the jet nozzle is suitable for different use scenes and working conditions.

As shown in fig. 19 to 21, the side wall of the jet orifice 2-1 of the present embodiment near the top of the jet pipe is higher than the side wall far from the top of the jet pipe, the axial direction of the jet orifice 2-1 from the inner wall of the jet device 2 to the outer wall of the jet device 2 forms an obtuse angle with the flow direction of the main flow, and the two side walls of the jet orifice 2-1 are diagonally opposite; the jet orifice 2-1 is convergent (see fig. 19), and the width of the jet orifice 2-1 is gradually reduced from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is expanded (see fig. 20), and the width of the jet orifice 2-1 gradually increases from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is in a laval shape (see fig. 21), and the width of the jet orifice 2-1 gradually decreases from the inner wall of the fluidic device 2 to the outer wall of the fluidic device 2 and then gradually increases.

Because the width at jet pipe top is greater than the width of jet pipe main part, be favorable to controlling the efflux direction and be greater than 90 degrees, can change the mixing coefficient simultaneously, be favorable to controlling 3 sizes in backward flow district to produce backward flow district 3 and backward flow district residual gas coefficient of equidimension not, can be applicable to different use scenes and operating mode conditions.

As shown in fig. 22 to 24, the side wall of the jet orifice 2-1 of the present embodiment near the top of the jet pipe is lower than the side wall far from the top of the jet pipe, the axial direction of the jet orifice 2-1 from the inner wall of the jet device 2 to the outer wall of the jet device 2 forms an acute angle with the main flow direction, and the two side walls of the jet orifice 2-1 are diagonally opposite; the jet orifice 2-1 is convergent (see fig. 22), and the width of the jet orifice 2-1 is gradually reduced from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is expanded (see fig. 23), and the width of the jet orifice 2-1 gradually increases from the inner wall of the jet device 2 to the outer wall of the jet device 2; alternatively, the jet orifice 2-1 is in the shape of a laval (see fig. 24), and the width of the jet orifice 2-1 gradually decreases from the inner wall of the fluidic device 2 to the outer wall of the fluidic device 2 and then gradually increases.

Because the width at jet pipe top is less than the width of jet pipe main part, can control the efflux direction and be less than 90 degrees, can change the mixing coefficient simultaneously, be favorable to controlling 3 sizes in backward flow district to produce backward flow district 3 and backward flow district residual gas coefficient of equidimension not, can be applicable to different use scenes and operating mode conditions.

The fluidic device 2 of the present embodiment is provided with a flow guiding structure and/or a blending structure, and the flow guiding structure and/or the blending structure is installed inside the fluidic device 2 or outside the fluidic device 2. As shown in fig. 25 and 26, the flow guiding structure and/or the blending structure may be a vaned flow guiding structure 4 or a swirler.

The flow guide structure and/or the mixing structure are favorable for mixing fuel oil and combustion-supporting gas or combustible gas and combustion-supporting gas, so that the combustion efficiency is improved, and the stability of flame combustion is improved.

As shown in FIG. 4, the distance between the centers of the two adjacent circular orifice-shaped orifices 2-1-2 of the present embodiment is larger than the diameter of the circular orifice-shaped orifice 2-1-2 and smaller than twice the diameter of the circular orifice-shaped orifice 2-1-2. Therefore, the two groups of round hole-shaped jet ports 2-1-2 which are arranged in a staggered mode can form a continuous, effective and stable pneumatic barrier, so that the backflow area 3 of the flame stabilizer is large, the flame stabilizing effect is good, and the combustion stabilizing boundary is wide.

As shown in fig. 27, the flame holder of the present embodiment includes at least one jet device 2. In mainstream runner 1, but a fluidic device 2 or a plurality of fluidic devices 2 cooperation use of exclusive use to obtain required combustion area, a plurality of fluidic devices 2 cooperation use can increase substantially combustion area in comparison with using a fluidic device, make the burning more abundant.

The flame stabilizer can be applied to main combustion chambers, afterburners, interstage combustion chambers of gas turbine engines, ramjet combustion chambers and combustion boilers and other industrial combustion devices.

Claims

1. A flame stabilizer comprises a jet device (2) installed in a main flow channel (1), wherein a jet orifice (2-1) is arranged on the jet device (2), and the flame stabilizer is characterized in that: the jet orifice (2-1) is in a slit shape, and the jet orifice (2-1) is a slit-shaped jet orifice (2-1-1);

the side wall of the jet opening (2-1) close to the top of the jet device is horizontally opposite to the side wall of the jet opening (2-1) far away from the top of the jet device; or the side wall of the jet orifice (2-1) close to the top of the jet device is higher than the side wall far away from the top of the jet device, the axial direction of the jet orifice (2-1) from the inner wall of the jet device (2) to the outer wall of the jet device (2) forms an obtuse angle with the flow direction of the main flow, and the two side walls of the jet orifice (2-1) are opposite in an inclined way; or the side wall of the jet orifice (2-1) close to the top of the jet device is lower than the side wall far away from the top of the jet device, the axial direction of the jet orifice (2-1) from the inner wall of the jet device (2) to the outer wall of the jet device (2) forms an acute angle with the main flow direction, and the two side walls of the jet orifice (2-1) are opposite in an inclined way;

the jet orifice (2-1) is in a convergent shape, and the width of the jet orifice (2-1) is gradually reduced from the inner wall of the jet device (2) to the outer wall of the jet device (2); or the jet opening (2-1) is in an expanded shape, and the width of the jet opening (2-1) is gradually increased from the inner wall of the jet device (2) to the outer wall of the jet device (2); or the jet opening (2-1) is in a Laval shape, and the width of the jet opening (2-1) is gradually reduced and then gradually increased from the inner wall of the jet device (2) to the outer wall of the jet device (2).

2. A flame holder according to claim 1, characterized in that the jet device (2) is a jet pipe, which is cylindrical, elliptic cylindrical or prismatic; the central axis of the jet pipe is parallel to or vertical to the extending direction of the main flow channel; the side wall of the jet pipe is provided with the slit-shaped jet orifice (2-1-1), and the extension direction of the length of the slit-shaped jet orifice (2-1-1) is vertical to the extension direction of the main flow channel (1).

3. A flame holder according to claim 1, characterized in that the jet device (2) is a jet plate, and the slot-like jet openings (2-1-1) are arranged on the bottom and top surfaces of the jet plate, and the length of the slot-like jet openings (2-1-1) extends in a direction perpendicular to the main flow channel (1).

4. A flame holder according to claim 1, characterised in that the jet device (2) is provided with a flow guiding structure and/or a blending structure, which are arranged inside the jet device (2) or outside the jet device (2).

5. A flame holder as claimed in claim 1, characterized in that the flame holder comprises at least one jet device (2).