JP2740138B2 - Jet burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet burner for supplying air and fuel to a combustion cylinder having an injection nozzle on the front side and burning the same to eject hot combustion gas from the injection nozzle at a high speed.

[0002]

2. Description of the Related Art In a jet burner of this type, a single annular air outlet is provided at a peripheral portion of a base portion of a combustion cylinder, a fuel outlet is provided at a central portion, and a jet is injected into an air guide path to the air outlet. In some cases, a guide means is provided so that swirling air flows.

[0003] In this jet burner, an annular air injection port is provided at the peripheral edge of the base, so that the injected fuel comes into contact with the inner wall of the combustion cylinder to prevent incomplete combustion and to use the suction force generated by the swirling flow. The fuel in the center is sucked and mixed with the air.

However, the injected air has a relatively regular flow along the inner wall of the combustion cylinder, and it is difficult to mix the fuel with the fuel near the center where the concentration is highest only by the suction force of the swirling flow. is there. In other words, the air injected as a swirling flow has a strong tendency to spread outward due to its centrifugal force, so that most of it flows along the inner wall of the combustion cylinder, and the air near the center tends to be short. And the mixing is delayed.

[0005] Accordingly, the combustion speed is slow and the flame becomes long, so that the combustion cylinder becomes long and the installation position and the like are easily limited. In addition, the injected air is used for combustion, and a considerable amount is discharged from the nozzle, so that complete combustion is difficult unless the excess air ratio is increased. In order to solve this problem, Japanese Patent Publication No. 58-17370 discloses a method in which two or more air injection ports are provided at the base of a combustion cylinder and the injected air is turned into a swirling flow in an air guide path to each air injection port. A jet burner provided with guide means has been proposed. Hereinafter, this jet burner will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, an annular air injection port 3a is opened at the base peripheral portion of the combustion cylinder 2 of the jet burner 1, and a circular air injection port 3b is provided at the center. I have. Spiral wings 5a, 5b as guide means for turning the jetted air into a swirling flow are provided in air guide paths 4a, 4b for guiding the air to the two air jet ports 3a, 3b, respectively.
Is provided. Further, between the air injection ports 3a and 3b, an injector 7 whose tip is a fuel injection port 6 is provided.
Project at equal intervals. In the air injection ports 3a and 3b,
High-pressure air is supplied from the air supply port 8 through the air guide paths 4a and 4b.
Supplies high pressure fuel.

In the jet burner 1, the fuel injected from the fuel injection port 6 is injected from the air injection port 3 b at the center to form a high-pressure air (compressed air) which is swirled toward the front end of the combustion cylinder 2. ) And gradually diffuses outward (on the inner wall side of the combustion cylinder 2). Then, it collides with the swirling flow of the air injected from the air injection port 3a at the peripheral portion and collides with the combustion cylinder 2
Spread in and mix.

As a result, there is no shortage of air near the center of the combustion cylinder 2 and there is no delay in mixing, so that rapid mixing can be obtained.

[0009]

However, in the jet burner 1 described in the above publication, the swirling flow of the compressed air moves to the air injection ports 3a and 3b while the plurality of blades 5
Since the air flows are guided along the surfaces a and 5b, a plurality of spiral air flows are formed into a so-called multi-spiral air flow in a layered manner, and uniform mixing of compressed air and fuel cannot be obtained.
Therefore, the flammability is poor.

That is, the compressed air passing through the air guide paths 4a and 4b is guided into a plurality of spiral spaces formed between the plurality of spiral blades 5a and 5b, and the spiral air flow ( (Swirl flow), and are ejected into the combustion cylinder 2 from the plurality of air ejection ports 3a and 3b, respectively. Therefore, the compressed air ejected into the combustion cylinder 2 becomes an aggregate of a plurality of spiral laminar flows ejected from the air outlets 3a and 3b, that is, a multi-spiral air flow. Since this multi-spiral air flow is spiral while passing through the air guide paths 4a and 4b, it has a velocity component in the traveling direction, and is ejected from the air outlet 3b at the periphery of the combustion cylinder. A plurality of laminar flows remain until they collide with the similar multi-spiral air flow. For this reason, since fuel is not mixed between each laminar flow, uniform mixing with combustion cannot be obtained.

In such a jet burner,
Generally, since the temperature in the combustion cylinder becomes high, a flow path of a cooling fluid is formed around the combustion cylinder, and a cooling fluid, for example, cooling water is caused to flow to suppress an increase in the temperature of the combustion cylinder. However, since the high-temperature gas in the combustion cylinder is absorbed by the cooling water through the combustion cylinder and the temperature near the inner wall of the combustion cylinder decreases, it is not possible to completely burn on the inner wall side of the combustion cylinder. Incomplete combustion occurs. Therefore, the flammability is poor.

Accordingly, an object of the present invention is to provide a jet burner which can mix compressed air and fuel more evenly and improve the combustibility.

[0013]

According to a first aspect of the present invention, a mixing chamber and an air induction chamber are provided on an inner cylindrical wall of an air register that separates the mixing chamber and the air induction chamber. Inside air having an opening communicating with the mixing chamber and ejecting compressed air in a direction deviated from the center of the mixing chamber on a section perpendicular to the axial direction of the mixing chamber to generate a swirling flow in a constant direction along the inner circumferential direction of the mixing chamber. It is characterized by having holes.

According to the first aspect of the present invention, the compressed air supplied to the air guide chamber flows into the mixing chamber through the inner air hole, and is mixed with the fuel supplied to the mixing chamber by the supply means. It is injected into the combustion chamber from the injection port. The compressed air that has flowed into the mixing chamber through the inner air hole is ejected from the opening of the inner air hole in a direction deviated from the center of the mixing chamber on a cross section perpendicular to the axial direction of the mixing chamber. A swirling flow follows in a certain direction. While this swirling compressed air and fuel are mixed in the mixing chamber,
The fuel is injected into the combustion chamber from the fuel injection port.

In this case, since the swirling flow of the mixing chamber has no velocity component in the traveling direction, the swirling flow is pushed by the compressed air which has flowed into the mixing chamber later while being swirled, and is ejected from the fuel ejection port into the fuel chamber. Therefore, the compressed air flowing from the plurality of inner air holes during the swirling in the mixing chamber is not mixed to form a laminar flow, but is uniformly mixed, and the fuel supplied to the mixing chamber in this state is mixed. Is done.

The invention according to claim 2 is the invention according to claim 1, wherein the air guide chamber and the combustion chamber communicate with the outer cylindrical wall of the air register that separates the combustion chamber and the air guide chamber. An outer side having an opening for generating a swirling flow in a fixed direction along the inner circumferential direction of the combustion chamber by ejecting compressed air in a direction inclined with respect to the radial direction of the combustion chamber on a cross section perpendicular to the axial direction of the combustion cylinder. It is characterized by having air holes.

According to the second aspect of the present invention, the compressed air supplied into the air guide path is jetted toward the inner wall of the combustion chamber through the outer air hole. The compressed air ejected toward the inner wall of the combustion chamber through the outer air hole is ejected in a direction in which the outer air hole is inclined with respect to the radial direction of the combustion chamber on a cross section perpendicular to the axial direction of the combustion cylinder. A swirling flow is generated in a certain direction along the inner circumferential direction of the combustion chamber. Since the swirling compressed air has no velocity component in the traveling direction, it is pushed by the compressed air flowing into the combustion chamber through the outer air hole later and moves to the front end side of the combustion chamber. For this reason, an air layer swirling along the inner wall of the combustion chamber is formed. This air layer acts as a heat insulator between the inside of the combustion chamber and the inner wall of the combustion tube.

The invention according to claim 3 is the invention according to claim 2, characterized in that a cooling fluid passage through which a fluid for cooling the combustion cylinder flows is provided outside the combustion cylinder.

According to the third aspect of the present invention, the atomized fuel injected from the fuel injection port and mixed with the compressed air is ignited by the igniter and burned. Although the heat generated by the combustion is transmitted to the combustion cylinder, the heat is absorbed by the cooling fluid flowing through the cooling fluid passage outside the combustion cylinder. In this case, since an air layer which is ejected from the outer air hole and swirls along the inner wall of the combustion chamber is formed on the inner wall of the combustion cylinder,
The heat from the combustion is not transmitted directly to the inner wall of the combustion chamber,
It is not directly absorbed by the cooling fluid outside the combustion cylinder.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the connection between the outer cylindrical wall and the inner cylindrical wall is made, and the combustion chamber and the air are connected. It is characterized in that it has an annular flat plate section that partitions off the guidance chamber.

According to the fourth aspect of the present invention, the swirling flow which is ejected into the combustion chamber from the outer air hole and is formed along the inner wall of the combustion cylinder is mixed with fuel and ejected from the fuel ejection port into the combustion chamber. A circulating flow of the hot gas after combustion is generated on the annular flat plate side between the swirling flow and the swirling flow. The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the tip of the supply means is closer to the air guide chamber than the annular flat plate. I have.

According to the fifth aspect of the present invention, since the leading end of the supply means is located closer to the air guide chamber than the annular flat plate portion, it flows into the mixing chamber through the inner air hole and becomes a swirling flow. In the air, the fuel generated from the front end of the supply means during the time from the combustion outlet to the inside of the combustion chamber is entrained from the inside and is sufficiently mixed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of a jet burner according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the inside of a combustion cylinder 12 of a jet burner 10, and FIG.
FIG. 2 is a sectional view taken along the line II-II in FIG. 1.
FIG. 3 is a sectional view showing the entire jet burner 10 and the inside thereof. The jet burner 10 shown in FIG.
Is a water-cooled jet burner for cooling the combustion tube 12 with cooling water.

As shown in FIG. 3, the jet burner 10 of the first embodiment includes a combustion cylinder 12 having an injection nozzle 11 formed on the front side, an injector (supply means) 13 for generating mist-like fuel, Combustion chamber 14 and mixing chamber 1 inside combustion cylinder 12
5. It is provided with an air register 17 which divides the compressed air into a swirling flow and an igniter 18 which ignites atomized fuel mixed with the compressed air.

The combustion cylinder 12 is housed in a front body outer cylinder 19. The front body outer cylinder 19 is formed integrally with the rear body outer cylinder 20. A water guide 21 is provided between the front body outer cylinder 19 and the combustion cylinder 12. An outward path 22 of the cooling water flow path is formed between the outer wall of the combustion cylinder 12 and the water guide 21, and a return path 23 of the cooling water flow path is formed between the inner wall of the front body outer cylinder 19 and the water guide 21. Have been. The forward path 22 and the return path 23 of the cooling water flow path are communicated with each other on the tip end side of the combustion cylinder 12.

The rear end of the water guide 21 is connected to the middle cylinder 24 of the rear body. Between the rear body middle cylinder 24 and the inner wall of the rear body outer cylinder 20, the outward path 2 of the cooling water flow path is provided.
A cooling water flow passage 25 communicating with the cooling water passage 2 is formed. Further, the rear end side of the combustion cylinder 12 is connected to the rear body inner cylinder 26. A cooling water passage 27 is formed between the outer wall of the rear body inner cylinder 26 and the rear body middle cylinder 24. The cooling water flow path 27 communicates with the return path 23 of the cooling water flow path. The rear body middle cylinder 24 is the rear body outer cylinder 2
A cooling water inlet side mouthpiece 28 is formed so as to protrude from the rear end side from zero. Further, a cooling water outlet side mouthpiece 29 is formed in the rear body outer cylinder 20. Rear body inner cylinder 2
An air mouthpiece 30 is formed on the rear end side of 6.

Then, cooling water is sent from the cooling water inlet side base 28 into the cooling water flow path 25 by a circulation pump (not shown), and flows around the combustion cylinder 12 through the outward path 22. Cooling water outlet side base 2 through passage 27
It is discharged from 9. Also, compressed air is supplied from the air base 30 into the rear body inner cylinder 26. Accordingly, the air register 17 side of the rear body inner cylinder 26 is the air guide chamber 16.

The rear end of the rear body inner cylinder 26 connected to the rear end of the combustion cylinder 12 is closed by a rear end flange 31. A fuel pipe 32 is inserted through the center of the rear end flange portion 31, and an injector 13 is connected to the combustion pipe 12 of the fuel pipe 32. The injector 13 converts the liquid fuel into atomized
Inside, that is, into the combustion chamber 14.

The air register 17 is disposed on the rear body inner cylinder 26 side of the combustion cylinder 12. This air register 1
Reference numeral 7 divides the interior of the combustion cylinder 12 into a combustion chamber 14, a mixing chamber 15, and an air induction chamber 16 as described above. As shown in FIG. 2, the air register 17 includes an annular flat plate portion 33 provided between the combustion chamber 14 and the air guide chamber 16, and a mixing chamber 15 provided at the center of the annular flat plate portion 33 and inside. And an outer cylindrical wall 35 provided on the inner wall side of the combustion chamber 14. Air register 1
An injection port 36 that connects the mixing chamber 15 and the combustion chamber 14 is formed at the center of the nozzle 7. Further, the tip of the injector 13 is disposed in the mixing chamber 15 so as to penetrate the inner cylindrical wall portion 34.

The mixing chamber 15 and the air guide chamber 16 communicate with the inner cylindrical wall 34, and compressed air is jetted in a direction deviated from the center of the mixing chamber 15 on a cross section perpendicular to the axial direction of the mixing chamber 15. 4 having an opening 38 for generating a swirling flow 40 (see FIG. 4) in a certain direction along the inner circumferential direction of the mixing chamber 15.
Two inner air holes 39 are provided. These four inner air holes 39 are provided along the axial direction of the mixing chamber 15.
It is formed in each place. These inner air holes 39 have an opening 37 on the side of the air guide chamber 16 formed in a straight tubular shape having the same diameter as the opening 38.

When the compressed air supplied to the air guide chamber 16 passes through the inner air holes 39 and flows into the mixing chamber 15, the inner circumference of the mixing chamber 15 is mixed in the mixing chamber 15, as shown in FIG. A swirling flow 40 flows along the direction. The compressed air that has become the swirling flow is sequentially pushed out by the compressed air that has passed through the inner air holes 39 and has become the swirling flow 40,
The air is sent from the injection port 36 of the air register 17 into the combustion chamber 14. At this time, the atomized fuel ejected from the injector 13 is mixed with the swirling compressed air, and together with the mixed atomized fuel, the fuel is injected from the injection port 36 into the combustion chamber 14.
Squirted into. In this case, the compressed air that has swirled into the mixing chamber 15 through the inner air holes 39 is supplied to the combustion chamber 1.
There is no velocity component in the traveling direction toward the fourth side, and the swirl flow itself does not eject from the injection port 36 into the combustion chamber 14, but becomes a swirl flow formed by passing through the inner air holes 39 one after another. The combustion chamber 1 is pushed out by air and
Squirted into 4.

The outer cylindrical wall portion 35 is provided in the combustion chamber 14.
And is formed to face the inner wall with a predetermined gap.
The outer cylindrical wall portion 35 includes the combustion chamber 14 and the air induction chamber 16.
The compressed air is ejected in a direction inclined with respect to the radial direction of the combustion chamber 14 on a cross section perpendicular to the axial direction of the combustion cylinder 12, and a swirl flow in a certain direction along the inner circumferential direction of the combustion chamber 14 is performed. Four outer air holes 43 having openings 41 for generating 46 are provided. Also, the outer air hole 43
The opening 42 on the air guide chamber 16 side is formed in a straight tube having the same diameter as the opening 41.

Then, when the compressed air supplied into the air guide chamber 16 flows through the inner air hole 39 and flows into the combustion chamber 14, as shown in FIG.
A swirling flow 46 flows along the inner wall between the inner wall 4 and the inner wall 4. The compressed air that has become the swirling flow 46 passes through the outer air hole 43 later and is extruded into compressed air that forms a swirling flow between the outer cylindrical wall portion 35 and the combustion chamber 14, and
While moving along the inner wall of the combustion chamber 14 toward the tip end of the combustion chamber 14. In this case, the swirling flow 46 passes through the outer air hole 43 and
The compressed air, which has become, tends to spread outward, but its expansion is regulated by the inner wall of the combustion chamber 14, so that it becomes an air layer along the inner wall of the combustion chamber 14.

The inner air hole 39 and the outer air hole 4
3, the area ratio of the inner air hole 39 is 80 to 85%,
The outer air holes 43 are set at 15 to 20%.

One side of the igniter 18 is supported on the annular flat plate portion 33 between the inner cylindrical wall portion 34 and the outer cylindrical wall portion 35. The other side of the spark plug 18 passes through the rear end flange portion 31. The ignition plug 18 ignites the atomized fuel mixed with the compressed air jetted from the jet port 36 into the combustion chamber 14. Further, the annular flat plate portion 33 includes a flame detector 4.
4 has been inserted. The flame detector 44 detects whether or not the mist fuel mixed with the compressed air in the combustion chamber 14 is burning.

Next, the operation of the jet burner 10 will be described.

First, compressed air is supplied from the air base 30 into the air guide chamber 16, and fuel is supplied from the fuel pipe 32 to the injector 13. The compressed air supplied into the air induction chamber 16 is supplied from the inner air hole 39 to the mixing chamber 15.
And a swirling flow 4 in the mixing chamber 15 as shown in FIG.
It becomes 0. In this case, the swirling flow 40 does not have a velocity component in the traveling direction toward the ejection port 36 side. Then, the swirling flow 40 flows into the mixing chamber 15 from the inner air hole 39 one after another.
Is pushed by the compressed air that has become a jet port 36 in the mixing chamber 15.
It moves toward the side and is mixed with the atomized fuel ejected from the injector 13.

In this mixing, the atomized fuel ejected from the injector 13 is entangled in the swirling flow 40 from the inside and mixed. As a result, the atomized fuel is uniformly distributed in the swirling flow 40, and good mixing is obtained. Then, the compressed air in which the fuel is mixed is jetted out of the injection port 36 into the combustion chamber 14, and the mixed fuel is ignited by the ignition plug 18 to start combustion.

On the other hand, the outer air hole 43 of the outer cylindrical wall portion 35
The compressed air that has flowed from the air guide chamber 16 into the combustion chamber 14 forms a swirling flow 46 between the outer cylinder wall 35 and the inner wall 12 a of the combustion cylinder 12. And one after another outside air hole 4
3, which is pushed by the compressed air that has flowed between the outer cylinder wall 35 and the inner wall 12 a of the combustion cylinder 12 to form the swirling flow 46, that is, the tip of the combustion chamber 14, that is, the inner wall 12 a
To the injection nozzle 11 side. In this case, the compressed air spouted from the outer air holes 43 and turned into a swirling flow is distributed on the inner wall 12a along the inner wall 12a of the combustion tube 12, and thus has a so-called film cooling function.

The compressed air mixed with the mist fuel is successively supplied into the combustion chamber 14 and burns, and a high-temperature jet gas is blown out from the nozzle 11. In this state, as shown in FIG. 4, the swirling flow 40 of the compressed air in which the fuel is mixed and injected into the combustion chamber 14 from the injection port 36 and the compression air distributed along the inner wall 12a of the combustion tube 12 are formed. A circulating flow 47 of the high-temperature gas after combustion is generated between the swirling flow 46 of the air and the annular flat plate 33 side. The circulating flow 47 of the high-temperature gas is such that gas generated after burning in the combustion chamber 14 stays on the annular flat plate portion 33 side, and the swirling flow 4 on the inner wall 12a side of the combustion tube 12.
6 and a part of the compressed air of the swirling flow ejected from the ejection port 36 is circulated while being involved. The circulating flow of the high-temperature gas serves as an ignition source for the fuel mixed with the compressed air. In addition, cooling water flows through the outward path 22 and the return path 23 of the cooling flow path to cool the combustion cylinder 12.

According to the present embodiment, by providing the inner air holes 39 as described above, the compressed air passing through the inner air holes 39 is mixed with the swirling flow 40 having no velocity component in the traveling direction in the mixing chamber 15. Therefore, the compressed air has a uniform distribution (speed, concentration). Further, since the atomized fuel is caught in the swirling flow 40 of the compressed air having a uniform distribution from the inside, the fuel can be uniformly mixed in the swirling flow, and good mixing can be obtained.

In the present embodiment, the compressed air that has passed through the inner air holes 39 and has been jetted into the mixing chamber 15 has no velocity component in the traveling direction, that is, toward the jet port 36, so that the compressed air has a plurality of There is no gap between the jetted compressed air and the swirling flow 40 has a substantially uniform pressure. In other words, the swirling flow ejected from the ejection port through the plurality of spiral grooves has a velocity component in the traveling direction, so that a small portion of compressed air is generated between the grooves and uniform pressure is generated. And not a swirling flow. On the other hand, in the swirling flow of the present embodiment, a substantially uniform swirling flow is obtained without a portion having a small amount of compressed air (a portion having a low pressure).

Further, according to this embodiment, when the fuel mixed with the compressed air jetted from the jet port 36 is burned in the combustion chamber 14, the circulating flow of the high-temperature gas after the combustion is applied to the annular flat plate portion 3.
The fuel is generated on the third side, and the high temperature gas ignites the fuel in the compressed air, so that the flame holding property is further improved.

Furthermore, according to the present embodiment, the swirling flow of the compressed air distributed along the inner wall 12a of the combustion tube 12 prevents the combustion gas in the combustion chamber 14 from directly contacting the inner wall 12a. The combustion chamber 1 is cooled by cooling water.
The high combustion state can be maintained while the cooling water loss is reduced without lowering the temperature in the combustion chamber 4, and the fuel can have high flammability, that is, the fuel can be substantially completely burned in the combustion chamber 14.

In the present embodiment, it is not necessary to form a spiral groove or provide a spiral wing to generate a swirling flow, and the inner air hole 39 is formed in the inner cylindrical wall portion 34. Since the swirling flows 40 and 46 can be easily generated simply by providing the outer air holes 43 in the outer cylindrical wall portion 35, the manufacturing cost can be reduced.

Second Embodiment Next, a jet burner 50 of a second embodiment shown in FIG. 6 will be described. The jet burner 50 of the second embodiment is a so-called air-cooled jet burner.

As shown in FIG. 6, similarly to the jet burner 10 of the first embodiment, the jet burner 50 of the second embodiment has a combustion cylinder 52 having an injection nozzle 51, an injector 53, and a combustion cylinder 52. Inside the combustion chamber 54, the mixing chamber 5
5. An air register 57 which partitions into an air guide chamber 56 and generates a swirling flow, and an igniter 58 are provided.

The combustion cylinder 52 is housed in an outer cylinder 59, and the rear end is closed by a rear flange 60. Outer cylinder 59
An intermediate cylinder 61 is disposed between the combustion cylinder 52 and the combustion cylinder 52. A return path 62 of the cooling air passage is formed between the middle cylinder 61 and the outer periphery of the combustion cylinder 52, and a forward path 63 of the cooling air passage is formed between the middle cylinder 61 and the outer cylinder 59. The forward path 63 and the return path 62 communicate with each other on the tip end side of the combustion cylinder 52. Further, the middle cylinder 61 is formed to be longer than the combustion cylinder 52, and an air guide chamber 56 is formed inside the combustion chamber 54 and surrounded by an air register 57. Further, an air base 64 is formed in the outer cylinder 59.

The compressed air supplied from the air base 64 passes through the outward path 63 and returns to the leading end 62
And flows through the return path 62 along the outer periphery of the combustion cylinder 52 to the rear end side, and flows into the air guide chamber 56. The compressed air that has flowed into the air guiding chamber 56 is swirled and jetted into the combustion chamber 54 when passing through the air register 57.

As described above, the air register 57 divides the inside of the combustion cylinder 52 into the combustion chamber 54, the mixing chamber 55,
Section 6 It should be noted that the air register 57 of the present embodiment is used.
Has the same configuration as that of the air register 17 of the first embodiment, and a description thereof will be omitted.

Further, as in the first embodiment, the igniter 5 having the rear end flange portion 60 inserted into the annular flat plate portion 33 is provided.
8. One end of the flame detector 65 is supported.

To operate the air-cooled jet burner 50, compressed air is supplied from an air base 64 and combustion is supplied to an injector 53. The compressed air supplied from the air base 64 passes through the outward path 63 and
After flowing into the return path 62 on the leading end side of the combustion chamber 52, the air is supplied into the air guide chamber 56 along the outer periphery of the combustion cylinder 52. The compressed air supplied into the air guide chamber 56 flows into the mixing chamber 55 from the inner air holes 39 as shown in FIGS. In this case, the compressed air of the swirling flow does not have the velocity component in the traveling direction toward the ejection port 36 side. Then, the mixing chamber 5 is successively inserted through the inner air holes 39.
The compressed air that has flowed into the inside 5 and turned into the swirling flow 40 moves in the mixing chamber 55 toward the ejection port 36 side. At this time, the compressed air is mixed with the atomized fuel ejected from the injector 53.

In this mixing, the atomized fuel ejected from the injector 53 is entrained in the swirling flow and mixed.
As a result, the atomized fuel is uniformly distributed in the swirling flow, and good mixing is obtained. Then, the compressed air in which the fuel is mixed is injected from the injection port 36 into the combustion chamber 54, and the mixed fuel is ignited by the igniter 58 to start combustion.

On the other hand, the outer air hole 43 of the outer cylindrical wall portion 35
The compressed air that has flowed from the air guide chamber 56 into the combustion chamber 54 through the passage forms a swirling flow between the outer cylinder wall 35 and the inner wall 52 a of the combustion cylinder 52. Then, the compressed air that has flowed from the inner air hole to the space between the outer cylinder wall portion 35 and the inner wall 52a of the combustion cylinder 52 and has become the swirling flow 46 is pushed by the combustion chamber 54 one after another.
It moves toward the injection nozzle 51 along the outer portion, that is, along the inner wall 52a of the combustion cylinder 52. In this case, the outer air hole 4
The compressed air ejected from the nozzle 3 and turned into a swirling flow is distributed on the inner wall 52a of the combustion cylinder 52 along the inner wall 52a, and thus has a so-called film cooling function.

The compressed air mixed with the mist fuel is successively supplied into the combustion chamber 54 and burns, and a high-temperature jet gas is blown out from the nozzle 51. In this state, as shown in FIG. 4, the swirling flow of the compressed air mixed with the fuel and injected from the injection port 36 into the combustion chamber 54 and the inner wall 52 of the combustion cylinder 52
A high-temperature circulating flow is generated on the annular flat plate portion 33 side between the swirling flow of the compressed air distributed along a. This high-temperature circulating flow is formed by the gas generated after burning in the combustion chamber 54 stagnating on the annular flat plate portion 33 side and the swirling flow on the inner wall 52 a side of the combustion tube 52 and the swirling flow ejected from the injection port 36. It circulates while entraining part of the compressed air. The high-temperature circulating flow serves as an ignition source for the fuel mixed with the compressed air. In addition, cooling water is flown in the outward path and the return path of the cooling flow path to cool the combustion cylinder 52.

According to the second embodiment, similarly to the first embodiment, there is no gap between the compressed air ejected from the plurality of inner air holes 39 and the swirling flow 4 having a substantially uniform pressure.
It becomes 0. In other words, the swirling flow ejected from the ejection port through the plurality of spiral grooves has a velocity component in the traveling direction, so that a small portion of compressed air is generated between the grooves and uniform pressure is generated. And not a swirling flow.

Further, when the fuel mixed with the compressed air jetted from the jet port 36 is burned in the combustion chamber 54, a high-temperature circulating flow is generated on the annular flat plate portion 33 side. Is more improved.

Further, according to the present embodiment, the high-temperature gas generated by combustion does not directly contact the inner wall of the combustion cylinder 52, and the compressed air layer swirling along the inner wall 52a of the combustion cylinder 52 therebetween. As a result, the temperature of the combustion cylinder 52 does not become high, and the life of the combustion cylinder 52 can be extended.

In each of the above embodiments, a fluid such as kerosene (kerosene), fuel oil A, or gasoline is used as a fuel, and compressed air is used as a fuel even if compressed air is used as an oxidant. May be. When gas is used as the fuel and compressed oxygen is used as the oxidizing agent, it is not necessary to jet the fuel in a mist state, and the gases are mixed with each other, so that good mixing is obtained and the combustibility is further improved.

[0060]

As described above, according to the first aspect of the present invention, the inside air hole is formed by jetting compressed air in a direction deviated from the center of the mixing chamber on a section perpendicular to the axial direction of the mixing chamber. Since it has an opening that generates a swirling flow in a certain direction along the inner circumferential direction of the chamber, it becomes a swirling flow in the mixing chamber, and the compressed air flowing from the plurality of inner air holes during the swirling is mixed. It does not become laminar and is uniformly mixed. Further, since the fuel is uniformly mixed with the compressed air, high combustibility is obtained.

According to the second aspect of the present invention, the compressed air ejected toward the inner wall of the combustion chamber through the outer air hole is
Outer air holes eject compressed air in a direction inclined with respect to the radial direction of the combustion chamber on a cross section perpendicular to the axial direction of the combustion cylinder to generate a swirling flow in a fixed direction along the inner circumferential direction of the combustion chamber. Due to the openings, a swirling flow occurs in the combustion chamber, and a swirling air layer of compressed air swirling along the inner wall of the combustion chamber is formed on the inner wall of the combustion chamber. Is not in direct contact. Therefore, heat loss due to the cooling fluid can be reduced, and high flammability can be obtained.

According to the third aspect of the present invention, since the outside of the combustion cylinder is cooled by the fluid flowing in the cooling passage, the temperature of the combustion cylinder does not become high.

According to the fourth aspect of the present invention, the swirling flow which is ejected into the combustion chamber from the outer air hole and formed along the inner wall of the combustion cylinder is mixed with the fuel and ejected from the fuel ejection port into the combustion chamber. Since a high-temperature circulating flow is generated on the annular flat plate side between the swirling flow and the swirling flow, the high-temperature circulating flow serves as an ignition source of fuel in the compressed air, and the flame holding property is improved.

According to the fifth aspect of the present invention, since the leading end of the supply means is located closer to the air guide chamber than the annular flat plate, the fuel is entangled in the swirling flow of the compressed air from the inside and is sufficiently mixed. A mixture is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a jet burner according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a part of the jet burner of the first embodiment and cutting along a II-II line in FIG.

FIG. 3 is a cross-sectional view showing the overall configuration of the jet burner according to the first embodiment.

FIG. 4 is a sectional view showing a flow of compressed air in the jet burner according to the first embodiment.

FIG. 5 is a cross-sectional view showing a flow of compressed air in the jet burner according to the first embodiment.

FIG. 6 is a cross-sectional view illustrating the overall configuration of a jet burner according to a second embodiment.

FIG. 7 is a sectional view showing a conventional jet burner.

FIG. 8 is a sectional view showing a base of a conventional jet burner.

[Explanation of symbols]

 10, 50 Jet burner 11, 51 Injection nozzle 12, 52 Combustion cylinder 13, 53 Injector 14, 54 Combustion chamber 15, 55 Mixing chamber 16, 56 Air induction chamber 17, 57 Air register 34 Inner cylinder wall 35 Outer cylinder wall 39 Inside air hole 43 Outside air hole

Claims (5)

(57) [Claims] 1. A combustion cylinder having an injection nozzle formed on a front side thereof, a supply means for supplying fuel into the combustion cylinder, an air guide chamber provided in the combustion cylinder and supplied with compressed air, A tip end portion of the injector is arranged, and a mist-like fuel generated by the injector and a mixing chamber in which the compressed air from the air induction chamber is mixed, and the fuel and compressed air mixed in the mixing chamber are injected. A fuel injection port for partitioning the combustion chamber, the air induction chamber, the mixing chamber, and the combustion chamber, and injecting fuel and compressed air mixed between the mixing chamber and the combustion chamber. An air register, and a jet burner comprising an igniter for igniting fuel injected into the combustion chamber, wherein an inner cylindrical wall portion of the air register that partitions the mixing chamber and the air induction chamber, In front of the mixing chamber Communicates with the air induction chamber and blows out compressed air in a direction deviated from the center of the mixing chamber on a cross section perpendicular to the axial direction of the mixing chamber to generate a swirling flow in a constant direction along the inner circumferential direction of the mixing chamber. A jet burner having an inner air hole having an opening. 2. The invention according to claim 1, wherein the air guide chamber and the combustion chamber communicate with an outer cylindrical wall of the air register that partitions the combustion chamber and the air guide chamber, An outer side having an opening for emitting compressed air in a direction inclined with respect to the radial direction of the combustion chamber on a cross section perpendicular to the axial direction of the combustion cylinder to generate a swirling flow in a fixed direction along the inner circumferential direction of the combustion chamber. Jet burner with air holes. 3. The jet burner according to claim 2, wherein a cooling fluid passage through which a fluid for cooling the combustion cylinder flows is provided outside the combustion cylinder. 4. The invention according to claim 1, wherein a connection is made between the outer cylinder wall and the inner cylinder wall, and the combustion chamber and the air guide are connected. A jet burner having an annular flat plate section for partitioning a chamber. 5. The jet according to claim 1, wherein a tip portion of the supply means is closer to the air guide chamber than the annular flat plate portion. burner.