JP2019015180A - Refrigeration mechanism for combustion chamber - Google Patents

Abstract

To provide a refrigeration mechanism for a combustion chamber which disposes much more channels per unit length in a second direction and effectively conducts heat from the combustion chamber to a refrigerant.SOLUTION: A refrigeration mechanism 12 for a combustion chamber comprises: a bottom wall 21 in contact with the combustion chamber; an upper wall 22 which is disposed at an opposite side of the combustion chamber with respect to the bottom wall; and multiple sidewalls 23 which are in contact with the bottom wall and the upper wall, extend in a first direction Z along the bottom wall and are disposed side by side in a second direction Y which is orthogonal to the first direction. Between the sidewalls that are between the bottom wall and the upper wall and adjacent to each other in the second direction, a channel C1 of a substantially fixed width is formed and within the channel, a heat dispersion structure 26 is provided for dispersing and conducting heat from the combustion chamber that is conducted via the bottom wall, to a refrigerant R1 flowing in the channel.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cooling mechanism for a combustion chamber.

  Conventionally, in order to cool the combustion gas flowing through the combustion chamber, for example, a combustion chamber cooling mechanism as described in Patent Document 1 has been used.

  The combustion chamber cooling mechanism disclosed in Patent Document 1 includes a bottom wall in contact with the combustion chamber, an upper wall, and a plurality of side walls. A channel is formed between the bottom wall and the upper wall and between adjacent partition walls. Each flow path includes a first flow path and a second flow path that extend along the first direction, and a connection flow path that is disposed between the first flow path and the second flow path. The second flow path is arranged with respect to the first flow path so as to be offset along the bottom wall and in the second direction orthogonal to the first direction.

  The refrigerant that has flowed into the connection channel from the first channel is agitated by colliding in the connection channel. The stirred refrigerant flows from the connection channel into the second channel.

Japanese Patent Laid-Open No. 2006-166595

However, in the conventional combustion chamber cooling mechanism described above, since the first flow path and the second flow path are separated from each other in the second direction, the width of the flow path is widened in the second direction. For this reason, there exists a problem that it is difficult to arrange many flow paths per unit length in the second direction.
In addition, it is desired to efficiently cool the combustion gas flowing in the combustion chamber.

  The present invention has been made in view of such problems, and more channels are disposed per unit length in the second direction, and heat from the combustion chamber is effectively transmitted to the refrigerant. An object is to provide a cooling mechanism for a combustion chamber.

In order to solve the above problems, the present invention proposes the following means.
The combustion chamber cooling mechanism according to the present invention includes a bottom wall in contact with the combustion chamber, an upper wall disposed on the opposite side of the combustion chamber from the bottom wall, the bottom wall and the upper wall, A plurality of side walls extending in a first direction along the bottom wall and arranged side by side in a second direction orthogonal to the first direction, and between the bottom wall and the top wall and in the second direction A flow path having a substantially constant width is formed between the side walls adjacent to each other, and heat from the combustion chamber transmitted through the bottom wall is distributed to the refrigerant flowing in the flow path. The heat distribution structure to be transmitted is provided in the flow path.

In the combustion chamber cooling mechanism, the heat dispersion structure includes a partition member formed in a spiral wing shape that extends in the axial direction of the flow path in the flow path and circulates around the axis. Also good.
In the combustion chamber cooling mechanism, the heat dispersion structure is disposed in the flow path, and has a shape that gradually approaches the bottom wall as it goes from one side to the other side in the axial direction of the flow path. A member may be provided.

In the combustion chamber cooling mechanism, the heat distribution structure may have a shape in which the flow path extends in the first direction while meandering in the second direction.
In the combustion chamber cooling mechanism, the heat distribution structure may have a shape in which the width of the flow path gradually increases as it goes from the bottom wall side to the upper wall side.

  According to the combustion chamber cooling mechanism of the present invention, since the width of the flow path is substantially constant, more flow paths can be arranged per unit length in the second direction. Furthermore, since the heat distribution structure is provided in the flow path, the temperature of the refrigerant in the portion on the bottom wall side heated by the combustion chamber in the flow path is higher than the temperature of the other part in the flow path. The heat from the combustion chamber can be effectively transferred to the refrigerant while preventing the temperature from becoming too high.

It is a perspective view of the rocket engine in which the cooling mechanism of a 1st embodiment of the present invention is used. It is sectional drawing by surface A1 orthogonal to the axis line in the combustor of the rocket engine. It is the perspective view which permeate | transmitted the upper wall in FIG. It is the perspective view which permeate | transmitted the upper wall of the principal part in the cooling mechanism. It is sectional drawing of the cutting line VV in FIG. It is a perspective view of the partition member of the cooling mechanism. It is sectional drawing of the cutting line VII-VII in FIG. It is sectional drawing of the cutting line VIII-VIII in FIG. It is sectional drawing of the cutting line IX-IX in FIG. It is the perspective view which permeate | transmitted the upper wall of the principal part in the cooling mechanism of 2nd Embodiment of this invention. It is a XI direction arrow line view in FIG. It is the perspective view which permeate | transmitted the upper wall of the principal part in the cooling mechanism of 3rd Embodiment of this invention. It is sectional drawing orthogonal to the axis line of the flow path in area | region A3 in FIG. It is the perspective view which permeate | transmitted the upper wall of the principal part in the cooling mechanism of 4th Embodiment of this invention. It is sectional drawing orthogonal to the axis line of a flow path in the flow path of the cooling mechanism.

(First embodiment)
Hereinafter, a first embodiment of a combustion chamber cooling mechanism (hereinafter abbreviated as a cooling mechanism) according to the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a rocket engine 1 in which the cooling mechanism of the present embodiment is used. The rocket engine 1 includes a combustor 11 and a nozzle 16. The combustor 11 has a cooling mechanism 12 formed in a cylindrical shape. A combustion chamber 13 is formed inside the cooling mechanism 12.

As shown in FIGS. 2 and 3, the cooling mechanism 12 includes a bottom wall 21, an upper wall 22, and a plurality of side walls 23. In FIG. 2, the cooling mechanism 12 is shown thick in the radial direction X of the combustor 11 in order to make the side wall 23 and the like easier to see.
The bottom wall 21 is formed in a cylindrical shape and is in contact with the combustion chamber 13.
The upper wall 22 is disposed on the opposite side of the combustion chamber 13 with respect to the bottom wall 21 so as to face the bottom wall 21. The upper wall 22 is formed in a cylindrical shape, and surrounds the bottom wall 21 from the outside in the radial direction X and is disposed coaxially with the bottom wall 21.

The side wall 23 extends in the first direction Z along the bottom wall 21. In the present embodiment, the first direction Z is a direction along the central axis of the combustor 11. The side wall 23 is in contact with the bottom wall 21 and the upper wall 22. The plurality of side walls 23 are arranged side by side in the second direction Y orthogonal to the first direction Z. In the present embodiment, the second direction Y is the circumferential direction of the combustor 11. Since the radial direction X and the second direction Y, which is the circumferential direction, change depending on the position in the circumferential direction, the radial direction X, the first direction Z, and the second direction Y are the same as those in FIGS. Show.
The plurality of side walls 23 are formed integrally with the bottom wall 21.
A channel C1 is formed between the bottom wall 21 and the upper wall 22 and between the side walls 23 adjacent in the second direction Y. 3 and FIGS. 4, 10, 12, and 14 described later, the upper wall 22 is shown in a transparent manner. In FIG. 3, the number of the plurality of flow paths C1 is reduced.
Below, the several flow paths C1 of the several flow paths C1 which comprise the cooling mechanism 12, and the bottom wall 21, the upper wall 22, and the side wall 23 which comprise these flow paths C1 are demonstrated.

FIG. 4 is a perspective view of three flow paths C1 in the cooling mechanism 12. In the present embodiment, the side wall 23 extends linearly along the first direction Z. The axis of the channel C1 extends along the first direction Z. The flow path C1 has a substantially constant width regardless of the position in the first direction Z. Here, the width of the channel C1 is substantially constant regardless of the position in the first direction Z, for example, the ratio of the width of the maximum channel C1 to the width of the minimum channel C1 according to the position in the first direction Z. Means within 140%. This ratio is more preferably within 120%.
As shown in FIG. 5, for example, the cross-sectional shape of the flow path C <b> 1 by a plane orthogonal to the first direction Z is a rectangular shape that is long in the radial direction X. The cross-sectional shape by the plane orthogonal to the first direction Z of the side wall 23 is a rectangular shape that is long in the radial direction X.

As shown in FIGS. 4 to 6, a partition member (heat dispersion structure) 26 is disposed in the flow path C1. The partition member 26 extends in the first direction Z in the flow path C1 and is formed in a spiral wing shape that circulates around the axis of the flow path C1. In other words, the partition member 26 passes through the axis of the flow path C1 at each position in the axial direction of the flow path C1, and both ends thereof are in contact with at least one of the bottom wall 21, the upper wall 22, and the side wall 23, respectively. ing. The partition member 26 circulates around the axis of the flow path C1 as it goes from the first end to the second end of the flow path C1, so that the flow path C1 is separated from the first divided flow path C2 and the second divided flow. It is divided into the road C3.
As shown in FIG. 5, the cross-sectional shape orthogonal to the axis of the flow path C1 of the partition member 26 is a rectangular shape. Hereinafter, of the rectangular cross-sectional shape of the partition member 26, the longer dimension is referred to as the width, and the shorter dimension is referred to as the thickness.
Note that the refrigerant R1 flows through the divided flow paths C2 and C3. Although the kind of refrigerant | coolant R1 is not specifically limited, For example, the refrigerant | coolant R1 is liquid hydrogen. For example, as shown in FIG. 4, the refrigerant R <b> 1 flows in the direction of the arrow F <b> 1 from the one side to the other side along the first direction Z.

As shown in FIGS. 4 and 6, the partition member 26 rotates once around the axis of the flow path C1 for each reference length L1 in the first direction Z. More specifically, FIG. 5 is a sectional view of the cooling mechanism 12 taken along the cutting line V-V in FIG. In FIG. 5, the partition member 26 extends along the second direction Y and is in contact with the pair of side walls 23. In the present embodiment, the thickness of the partition member 26 is constant regardless of the position in the first direction Z.
FIG. 7 is a cross-sectional view of the cooling mechanism 12 taken along section line VII-VII in FIG. The partition member 26 is inclined so as to gradually approach the bottom wall 21 from one side (left side on the paper surface) to the other side (right side on the paper surface) in the second direction Y. The partition member 26 is in contact with the pair of side walls 23.

FIG. 8 is a cross-sectional view of the cooling mechanism 12 taken along section line VIII-VIII in FIG. The partition member 26 extends along the radial direction X and is in contact with the bottom wall 21 and the top wall 22.
FIG. 9 is a cross-sectional view of the cooling mechanism 12 taken along the cutting line IX-IX in FIG. The partition member 26 is inclined so as to gradually approach the upper wall 22 from one side of the second direction Y toward the other side. The partition member 26 is in contact with the pair of side walls 23.

In FIG. 5, the first divided flow path C2 disposed at the position on the bottom wall 21 side of the flow path C1 has an upper wall 22 side as shown in FIG. 9 as the refrigerant R1 flows in the direction of the arrow F1. It is arranged at the position. Similarly, in FIG. 5, the second divided flow path C3 disposed at the position on the upper wall 22 side of the flow path C1 has a bottom of the flow path C1 as shown in FIG. 9 as the refrigerant R1 flows in the direction of the arrow F1. It is arranged at a position on the wall 21 side. Of the divided flow paths C2 and C3, the flow path disposed at the position on the bottom wall 21 side is easily heated by the combustion chamber 13, and the flow path disposed at the position on the upper wall 22 side is heated by the combustion chamber 13. It is hard to be done.
That is, as the refrigerant R1 flows in the direction of the arrow F1, the position of the first divided flow path C2 is alternately switched between the position on the bottom wall 21 side, the position on the upper wall 22 side, the position on the bottom wall 21 side,. Correspondingly, the position of the second divided flow path C3 is alternately switched to a position on the upper wall 22 side, a position on the bottom wall 21 side, a position on the upper wall 22 side,.

The divided flow paths C2 and C3 arranged at the position on the bottom wall 21 side are replaced by the position in the first direction Z, so that the refrigerant R1 flowing in the divided flow paths C2 and C3 is transmitted via the bottom wall 21. Heat from the combustion chamber 13 is dispersed and transmitted.
In the first direction Z, the distance from the combustion chamber 13 of the refrigerant R1 flowing in the divided flow paths C2, C3 changes, so that only a part of the refrigerant R1 flowing in the divided flow paths C2, C3 is caused by the combustion chamber 13. Overheating is prevented.

In this embodiment, since the thickness of the partition member 26 is constant, when the partition member 26 extends along the radial direction X and the width of the partition member 26 is relatively long as shown in FIG. The cross-sectional area perpendicular to the axes of the paths C2 and C3 becomes narrow.
On the other hand, as shown in FIG. 5, when the partition member 26 extends along the second direction Y and the width of the partition member 26 is relatively short, the cross-sectional area perpendicular to the axis of the divided flow paths C2 and C3 becomes wide. .

  The bottom wall 21, the upper wall 22, the plurality of side walls 23, and the partition member 26 are formed of a metal such as copper. In order to manufacture the cooling mechanism 12, a known three-dimensional printer or the like capable of printing a three-dimensional shape can be used.

Next, the operation of the rocket engine 1 configured as described above will be described with an emphasis on the cooling mechanism 12.
When the fuel is combusted in the combustion chamber 13, combustion gas of several thousand degrees C. flows in the combustion chamber 13. The combustion gas flows in the direction opposite to the direction of the arrow F1. The refrigerant R1 is caused to flow in the direction of the arrow F1 through the divided flow paths C2 and C3 by a conveying means such as a turbo pump (not shown). Since the partition member 26 is disposed in the flow path C1 and the divided flow paths C2 and C3 are formed, the refrigerant R1 disposed at the position on the combustion chamber 13 side and the combustion chamber 13 as it goes in the first direction Z. Refrigerant R1 arranged at a position away from is alternately replaced. When the refrigerant R1 having a relatively low temperature is periodically arranged near the combustion chamber 13, the temperature gradient per unit length between the combustion gas and the refrigerant R1 increases, and the combustion gas is efficiently cooled.

  As described above, according to the cooling mechanism 12 of the present embodiment, since the width of the flow path C1 is substantially constant, more flow paths C1 can be disposed per unit length in the second direction Y. . Further, since the partition member 26 is disposed in the flow path C1, the temperature of the refrigerant R1 in the portion on the bottom wall 21 side heated by the combustion chamber 13 in the flow path C1 is the other temperature in the flow path C1. Therefore, the heat from the combustion chamber 13 can be effectively dispersed and transferred to the refrigerant R1. Therefore, the cooling mechanism 12 can be effectively cooled by the refrigerant R1.

  Since the heat dispersion structure includes the partition member 26, the divided flow paths C2 and C3 arranged at the position on the bottom wall 21 side are alternately switched as the refrigerant R1 flows in the direction of the arrow F1 along the first direction Z. Thereby, the temperature of the refrigerant | coolant R1 which flows through each division | segmentation flow path C2, C3 becomes mutually equivalent, and the heat from the combustion chamber 13 can be effectively transmitted to refrigerant | coolant R1.

In the present embodiment, the sectional area perpendicular to the axis of the first divided flow path C2 is constant regardless of the position in the first direction Z, and the second divided flow is independent of the position in the first direction Z. The thickness of the partition member 26 may be adjusted so that the cross-sectional area perpendicular to the axis of the path C3 is constant. Specifically, the product of the width of the partition member 26 and the thickness of the partition member 26 is adjusted to be constant.
With this configuration, the sectional areas of the divided flow paths C2 and C3 are constant regardless of the position in the first direction Z, and the pressure loss of the refrigerant R1 flowing through the divided flow paths C2 and C3 is reduced. be able to.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 10 and FIG. 11. However, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only differences will be described. explain.
As shown in FIG. 10, the cooling mechanism 32 of the present embodiment includes a guide member (heat dispersion structure) 33 disposed in the flow path C1 instead of the partition member 26 of the cooling mechanism 12 of the first embodiment. ing. The guide member 33 is formed so as to gradually approach the bottom wall 21 from one side of the first direction Z toward the other side. The refrigerant R1 flows in the flow path C1 in the direction of the arrow F1 from one side of the first direction Z toward the other side.

As shown in FIGS. 10 and 11, in this embodiment, the guide member 33 has a wing shape of an airplane or the like. For example, the guide member 33 is an airfoil such as NACA6415. It is preferable that the outer surface of the guide member 33 has a smooth shape with no corners. Since the guide member 33 has a smooth shape, it is possible to suppress the occurrence of pressure loss in the refrigerant R1.
The elevation angle of the guide member 33 with respect to the first direction Z is, for example, 15 °. As shown in FIG. 11, the distance L3 between the guide member 33 and the bottom wall 21 and the distance L4 between the guide member 33 and the upper wall 22 are preferably equal to each other.
As shown in FIG. 10, a plurality of guide members 33 may be arranged at intervals in the first direction Z.

Next, the operation of the cooling mechanism 32 configured as described above will be described.
As shown in FIG. 11, among the refrigerant R1 that flows toward the other side along the first direction Z indicated by the arrow F1, a place that is relatively far from the bottom wall 21 in the flow path C1 as indicated by the arrow F3. The refrigerant R1 having a relatively low temperature flows. The refrigerant R1 is guided by the guide member 33 as it goes to the other side in the first direction Z, and flows through a place relatively close to the bottom wall 21 as indicated by an arrow F4. Since the refrigerant R1 having a relatively low temperature flows in a place relatively close to the bottom wall 21, the heat from the combustion chamber 13 is effectively transferred to the refrigerant R1 having a relatively low temperature.

As described above, according to the cooling mechanism 32 of the present embodiment, more channels C1 can be disposed per unit length in the second direction Y.
Further, since the cooling mechanism 32 includes the guide member 33, the heat from the combustion chamber 13 is dispersed not only in the refrigerant R1 having a relatively high temperature but also in the refrigerant R1 having a relatively low temperature guided by the guide member 33. Can be transmitted. Therefore, the heat from the combustion chamber 13 can be effectively transmitted to the refrigerant R1 having a relatively low temperature.

  In the present embodiment, the guide member 33 has a wing shape, but the shape of the guide member is not limited to this. The guide member may be flat.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 12 and FIG. explain.
As shown in FIG. 12, the cooling mechanism 37 of the present embodiment replaces the partition member 26 of the cooling mechanism 12 of the first embodiment with the flow path C5 in the first direction Z while meandering in the second direction Y. An extending heat spreading structure 38 is provided.
Even when the flow path C5 meanders, the flow path C5 has a substantially constant width regardless of the position in the first direction Z. For this reason, even if the plurality of flow paths C5 are arranged in the second direction Y, the flow paths C5 adjacent in the second direction Y do not interfere with each other, and more flow paths per unit length in the second direction Y. C5 can be placed.

Next, the operation of the cooling mechanism 37 configured as described above will be described.
For example, the flow of the refrigerant R1 in the region A3 in the flow path C5 that is curved so as to protrude toward one side in the second direction Y (the lower left side in FIG. 12) will be described. In the cross section orthogonal to the axis of the flow path C5 in the region A3, as shown in FIG. 13, due to the centrifugal force acting on the refrigerant R1 and the temperature difference between the bottom wall 21 and the top wall 22, The secondary flow shown occurs. That is, the refrigerant R1 flows to one side in the second direction Y (left side in FIG. 13) by centrifugal force. The relatively high temperature refrigerant R1 disposed on the bottom wall 21 side has a low density and flows outward in the radial direction X, and the relatively low temperature refrigerant R1 disposed on the top wall 22 side has a low density. And flow inward in the radial direction X.
The flow rate of the secondary flow of the refrigerant R1 is slower than the flow rate of the refrigerant R1 in the first direction Z. Due to the secondary flow of the refrigerant R1, the refrigerant R1 flows not only in the direction along the second direction Y but also in the radial direction X in this cross section.

As described above, according to the cooling mechanism 37 of the present embodiment, more channels C5 can be arranged per unit length in the second direction Y.
Further, since the refrigerant R1 flows in the radial direction X in the flow path C5 due to the secondary flow of the refrigerant R1, the heat from the combustion chamber 13 transmitted through the bottom wall 21 is transferred to the refrigerant R1 in the flow path C5. Can be dispersed and effectively transmitted.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. 14 and FIG. 15, but the same parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. explain.
As shown in FIGS. 14 and 15, the cooling mechanism 42 of the present embodiment has a width of the flow path C7 from the bottom wall 21 side to the upper wall 22 instead of the partition member 26 of the cooling mechanism 12 of the first embodiment. A heat dissipating structure 43 having a shape gradually widening toward the side is provided.
In the present embodiment, the channel C7 has a triangular shape whose width becomes narrower inward in the radial direction X when viewed in the first direction Z. The axis of the channel C7 extends along the first direction Z. The flow path C7 is formed between the side walls 44 adjacent in the second direction Y. The cross-sectional shape by the plane orthogonal to the first direction Z of the side wall 44 is an isosceles trapezoidal shape with a long lower bottom on the bottom wall 21 side. That is, the width of the side wall 44 becomes gradually narrower from the bottom wall 21 side toward the upper wall 22 side.
One side wall 44 is shared by a pair of flow paths C7 that sandwich the side wall 44 in the second direction Y.

Here, as shown in FIG. 15, description will be made by paying attention to one channel C7A among the plurality of channels C7. A pair of side walls 44 sandwiching the flow path C7A is divided into two equal parts in the second direction Y by a virtual line L11 extending along the radial direction X. Of the halved side wall 44, the portion on the channel C7A side is defined as a first partial wall 44a, and the portion on the opposite side to the channel C7A is defined as a second partial wall 44b.
The width of the first partial wall 44a becomes gradually narrower from the bottom wall 21 side toward the upper wall 22 side.

  In general, the thermal conductivity of the side wall is larger than the thermal conductivity of the refrigerant. As for the width of the first partial wall 44a, the portion on the bottom wall 21 side is wider than the portion on the upper wall 22 side. For this reason, heat is easily conducted to the portion of the first partial wall 44a on the bottom wall 21 side. As indicated by an arrow F8, the heat from the combustion chamber 13 passes through the portion on the bottom wall 21 side of the first partial wall 44a, and not only the portion on the bottom wall 21 side in the channel C7A but also the upper side in the channel C7A. Effectively dispersed and transmitted to the portion on the wall 22 side.

  The refrigerant R1 in the flow path C7 adjacent to the flow path C7A in the second direction Y is connected to the flow path C7A by the second partial wall 44b of the side wall 44 sandwiching the flow path C7A in the second direction Y. Similarly, heat is effectively transferred.

As described above, according to the cooling mechanism 42 of the present embodiment, more channels C7 can be disposed per unit length in the second direction Y.
Furthermore, through the side wall 44 on the bottom wall 21 side having a large thermal conductivity, the heat from the combustion chamber 13 is transmitted not only to the portion on the bottom wall 21 side in the channel C7 but also to the upper wall 22 in the channel C7. It can also be distributed and transmitted to the side part. Therefore, the heat from the combustion chamber 13 can be effectively transmitted to the refrigerant R1.

The first to fourth embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration does not depart from the gist of the present invention. Changes, combinations, deletions, etc. are also included. Furthermore, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.
For example, in the first to fourth embodiments, the bottom wall and the top wall may be formed in a flat plate shape instead of a cylindrical shape.

12, 32, 37, 42 Cooling mechanism 13 Combustion chamber 21 Bottom wall 22 Upper wall 23, 44 Side wall 26 Partition member (heat dispersion structure)
33 Guide member (heat dispersion structure)
38, 43 Heat distribution structure C1, C5, C7 Flow path Y Second direction Z First direction

Claims (5)

A bottom wall in contact with the combustion chamber;
An upper wall disposed on the opposite side of the combustion chamber from the bottom wall;
A plurality of side walls arranged in contact with the bottom wall and the top wall, extending in a first direction along the bottom wall, and arranged in a second direction orthogonal to the first direction;
With
Between the bottom wall and the top wall and between the side walls adjacent in the second direction, a flow path having a substantially constant width is formed,
A heat distribution structure is provided in the flow path to disperse and transfer the heat from the combustion chamber transmitted through the bottom wall to the refrigerant flowing in the flow path.
Cooling mechanism for the combustion chamber. The heat distribution structure includes a partition member formed in a spiral wing shape that extends in the axial direction of the flow channel in the flow channel and circulates around the axis.
The combustion chamber cooling mechanism according to claim 1. The heat distribution structure includes a guide member that is arranged in the flow path and gradually approaches the bottom wall as it goes from one side in the axial direction of the flow path to the other side.
The combustion chamber cooling mechanism according to claim 1. The heat distribution structure includes a shape in which the flow path extends in the first direction while meandering in the second direction.
The combustion chamber cooling mechanism according to claim 1. The heat distribution structure has a shape in which the width of the flow path gradually increases as it goes from the bottom wall side to the upper wall side,
The combustion chamber cooling mechanism according to claim 1.

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