KR101179666B1 - An assembly having cooling channel - Google Patents

Abstract

The present invention relates to an assembly having a cylindrical cooling channel for cooling a combustion chamber of a precombustor of an engine system with kerosine-liquid oxygen as a propellant, in particular comprising a cooling channel and a cooling channel top plate. The cooling channel includes a plurality of protrusions for determining the flow direction and the flow rate of the cooling fluid, and a plurality of central injection holes located in the interior of the combustion chamber divided into the first combustion section and the second combustion section. The channel top plate includes a central manifold for allowing a predetermined space to be formed at a position where the central injection hole is formed, and thus has a cylindrical cooling channel, thereby achieving low flame pressure and low differential pressure at an extremely high O / F ratio. An assembly having a cooling channel is made possible.

Description

Assembly with cooling channel {AN ASSEMBLY HAVING COOLING CHANNEL}

The present invention relates to an assembly having a cylindrical cooling channel for cooling a combustion chamber of a precombustor of an engine system with kerosine-liquid oxygen as a propellant, in particular comprising a cooling channel and a cooling channel top plate. The cooling channel includes a plurality of protrusions for determining the flow direction and the flow rate of the cooling fluid, and a plurality of central injection holes located in the interior of the combustion chamber divided into the first combustion section and the second combustion section. The channel top plate has a cylindrical cooling channel, which includes a central manifold for allowing a certain space to be formed at a position where the central injection hole is formed, so that flame stabilization and low at an extremely high O / F ratio can be achieved. An assembly having a cooling channel that enables the implementation of a differential pressure.

In an open engine, a device for generating a gas for driving a turbine is called a gas generator. In a multistage combustion cycle engine, a preburner plays a role in generating this gas.

In an open engine, the gas passing through the turbine is discharged to outside air, but in a multistage combustion cycle engine, the gas passing through the turbine is sent back to the main combustion chamber for recombustion.

Therefore, the precombustor has an internal combustion pressure that is very high compared to the gas generator because it is connected to the turbine and combustor.

In addition, when kerosene and liquid oxygen are used as propellants of an engine, over-fuel combustion occurs in a gas generator, whereas peroxide combustion occurs in a pre-combustor.

In gas generators where over-fuel combustion takes place, kerosene is used to cool the combustion chamber like the main combustion chamber, but in the case of pre-combustion, it is impossible to use kerosene to cool the combustion chamber wall because there is not enough kerosine present, so liquid oxygen Using is the only alternative.

In addition, like the gas generator, the combustion gas generated from the preburner has a temperature limit because the turbine must be driven. In order to meet the required combustion gas temperature, the combustion gas must have a very high O / F ratio (oxidant / fuel ratio), but at high O / F ratios, the O / F ratio exceeds the flammable range inside the combustion chamber, so The problem arises that this is not done.

Therefore, in order to solve this problem, it is considered to first reduce the temperature of the final exhaust gas by controlling the amount of the oxidizing agent, and then first burning it within the flammable range, and then reacting the first combustion gas with the remaining oxygen again. In the combustor, there is a first combustion section with a high temperature and a second combustion section with a relatively low temperature, and thus, the amount of liquid oxygen required for cooling the wall is changed, so that a large amount of liquid oxygen is applied to the rear. Flowing a small amount of liquid oxygen allows cooling the wall effectively while maintaining a low differential pressure. Therefore, an assembly having a three-dimensional cooling channel is needed to implement this.

On the other hand, the preburner is a device that acts as a gas generator of the open-type combustor, the turbine is driven by the gas generated here, at this time there is a limitation in the temperature of the gas because the combustion gas is in direct contact with the turbine blades, After turbine operation, the combustion gas flows back into the combustion chamber through the injector, so pure gas free of combustion impurities must be maintained. Therefore, a high O / F ratio oxidant-fuel combination is used, which causes the interior of the combustion chamber 40 to become oxidant excess at a relatively high temperature. Therefore, effective cooling of the combustion chamber 40 wall surface is required.

The present invention relates to an assembly having a cooling channel, which satisfies the above requirements, and more particularly comprising a cooling channel and a cooling channel top plate, the cooling channel comprising a plurality of cooling channels for determining the flow direction and flow rate of the cooling fluid. The projection and the interior of the combustion chamber includes a plurality of central injection holes located in a portion divided into the first combustion section and the second combustion section, the cooling channel upper plate, a constant space is formed at a position where the central injection hole is formed It is an object of the present invention to provide an assembly having a cooling channel that enables the implementation of flame and low differential pressures at extremely high O / F ratios by being characterized as including a central manifold portion.

In order to achieve the above object, an assembly having a cylindrical cooling channel for cooling a combustion chamber of a preburner of an engine system of the kerosene-liquid oxygen-based propellant of the present invention comprises a cooling channel and a cooling channel top plate. The cooling channel may include a plurality of protrusions for determining a flow direction and a flow rate of the cooling fluid, and a plurality of central injection holes located at portions of the interior of the combustion chamber divided into a first combustion section and a second combustion section. And, the cooling channel top plate, characterized in that it comprises a central manifold portion to form a predetermined space at the position where the central injection hole is formed.

Here, the plurality of central injection holes may be formed six at intervals of 60 degrees with respect to the circumference of the circle of the cross section of the assembly having the cooling channel.

Here, the cooling channel top plate may further include a rear end manifold portion for allowing the cooling fluid flowing in the upper portion of the primary and secondary combustion sections to be collected again through the secondary combustion section to the central manifold. have.

Here, the cooling channel upper plate may further include a top opiris for adjusting the flow rate flowing in the front and rear ends of the central manifold portion.

Here, the cooling fluid may be liquid oxygen.

According to the assembly having the cooling channel of the present invention, it is possible to implement flame and low differential pressure at an extremely high O / F ratio, thereby effectively cooling the wall of the preburner while maintaining a low pressure loss.

1 shows a three-dimensional shape of a preburner equipped with an assembly having a cooling channel of the invention.
Figure 2 shows the three-dimensional shape of the cooling channel of the assembly with the cooling channel of the present invention.
Figure 3 shows a three-dimensional shape of the cooling top plate of the assembly having a cooling channel of the present invention.
Figure 4 shows a piece in a flat state by separating some of the assembly having a cooling channel of the present invention into a cooling channel and a cooling top plate.
5 is a cross-sectional view (a) and a fluid flow schematic (b) of the central manifold portion of the assembly with cooling channels of the present invention.
6 is a plan view of a portion of a cooling channel of an assembly having a cooling channel of the present invention.
7 is a plan view of a portion of a cooling channel top plate of an assembly having a cooling channel of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art may easily implement the present invention.

Prior to this, the terms or words used in this specification and claims should not be limited to the usual or dictionary meanings, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the configuration of the embodiments described herein is only one of the most preferred embodiments of the present invention and does not represent all of the technical idea of the present invention, various equivalents and modifications that can replace them at the time of the present application It should be understood that there may be

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 shows a three-dimensional shape of a preburner A equipped with an assembly 100 having a cooling channel 110 of the present invention.

As shown in FIG. 1, the preburner A cooled using the assembly 100 of the present invention includes a liquid oxygen inlet 10, an injector 20, a head plate 30, and a combustion chamber 40. In addition, the combustion chamber 40 is located in the injector 20 toward the central injection hole 113 again and the first combustion chamber 41 having a low O / F ratio and the second combustion chamber 42 having a high O / F ratio as a rear end. Divided.

The assembly 100 having the cooling channel 110 of the present invention has a three-dimensional cylinder shape surrounding the combustion chamber 40 to effectively cool the combustion chamber 40 of the preburner A.

First, liquid oxygen introduced through the liquid oxygen inlet 10 is introduced into the cooling channel 110 through the cooling channel inlet 111.

At this time, the liquid oxygen introduced through the cooling channel inlet 111 flows along the protrusion 112 and all participate in the cooling of the wall of the first combustion chamber 41, as shown in FIG. The flow path is divided into two parts, a part of which flows directly into the combustion chamber 40 through the central injection hole 113, and the rest continues to flow along the protrusion 112 of the cooling channel 110, and then again from the rear manifold 122. It flows in the opposite direction and collects in the central manifold 121.

That is, as shown in FIG. 3, the cooling channel upper plate 120 includes a central manifold 121 and a rear end manifold 122 to secure enough space for the liquid oxygen to flow in and flow therethrough.

Here, the protrusions 112 formed in the cooling channel 120 may be formed in plural and have a suitable width so that the incoming liquid oxygen flows smoothly, and the number is not limited.

Here, a plurality of central injection holes 113 formed in the cooling channel 120 is formed, but the number is not limited, but based on the circle of the cross section of the assembly 100 having the cooling channel, the circumference Six formed at 60 degree intervals relative to is preferred for effective cooling.

Figure 4 shows a flat shape by separating a longitudinal portion of the assembly having a cooling channel of the present invention into a cooling channel 110 and the cooling top plate 120.

Referring to FIG. 4, the liquid oxygen flows through the left end of the cooling channel 110 and flows through the protrusion 112 of the cooling channel 110 and a part of the cooling channel 110. The right end is reached, but the rest is blocked by the inner wall of the central injection hole 113.

At this time, the liquid oxygen is collected in the central manifold 121 of the cooling channel upper plate 120 through a plurality of upper opiris 123 'formed in the cooling channel upper plate 120, and part of the central injection hole 113 Through the interior of the combustion chamber 40, some exit the central manifold 121 through the other top opis 123 ″ and reach the right end of the cooling channel 110.

The liquid oxygen reaching the right end of the cooling channel 110 stays in the space formed by the rear end manifold 122 formed in the cooling channel upper plate 120, or the central injection hole of the cooling channel 110 in the reverse direction again ( Flowing toward 113 causes the second combustion chamber 42 to cool.

FIG. 5 is a cross-sectional view (a) and a fluid flow schematic (b) of a central manifold portion of an assembly having a cooling channel of the present invention, wherein the flow rate flowing through the cooling channel 110 may be varied as L, R, θ shown in FIG. Although influenced by factors, it is mainly determined by the size of the top opiris 123 of the cooling channel top plate 120. The size of the upper opiris 123 is determined by the differential pressure and the flow rate required for the cooling channel 110.

FIG. 6 is a plan view of the cooling channel shown in FIG. 4, and FIG. 7 is a plan view of the cooling channel top plate shown in FIG. 4, wherein the assembly 100 of the present invention brazes the cooling channel 110 and the cooling channel top plate 120. By joining, it is produced to have a common central injection hole 113.

In the section where the first combustion chamber is located, combustion occurs at a high temperature, and in the section where the second combustion chamber is located, combustion occurs at a relatively low temperature. As an assembly of the present invention, as much as is necessary in the section where the second combustion chamber is located. The liquid oxygen flows, and the rest is injected into the combustion chamber in advance, so that the flow rate on the wall surface of the second combustion chamber decreases, so that the differential pressure of the cooling channel can be reduced.

In addition, finally, all liquid oxygen should be introduced into the combustion chamber through the central injection hole. According to the assembly of the present invention, the central manifold and each channel are connected by the upper opisries so that no mutual interference between the flow paths occurs. Since the structure is introduced into the combustion chamber through the central injection hole it can be effectively cooled.

Although the present invention has been described above, this is only one embodiment, and it is apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

<Code description>

100: assembly with cooling channel of the invention

110: cooling channel

120: cooling channel top

111: cooling channel inlet

112: cooling channel protrusion

113: central sprayer

121: center manifold

122: rear manifold

123: top opiris

Claims (5)

An assembly having a cylindrical cooling channel for cooling a combustion chamber of a preburner of an engine system with kerosine-liquid oxygen as a propellant,
The assembly having the cylindrical cooling channel is provided with a cooling channel and a cooling channel top plate,
The cooling channel,
A plurality of protrusions for determining the flow direction and the flow rate of the cooling fluid; And
The interior of the combustion chamber includes a plurality of central injection holes located in a portion divided into the first combustion section and the second combustion section,
The cooling channel top plate,
And a central manifold portion for forming a predetermined space at a position where the central injection hole is formed.
The method of claim 1,
And wherein the plurality of central injection holes are formed six at intervals of 60 degrees with respect to the circumference of the circumference of the cross section of the assembly having the cooling channel.
The method of claim 1,
The cooling channel upper plate further comprises a rear end manifold portion for allowing the cooling fluid flowing in the upper portion of the first and second combustion sections to be collected again in the central manifold through the second combustion section. An assembly having a cylindrical cooling channel.
The method of claim 1,
And said cooling channel top plate further comprises an upper opiris to adjust the flow rates flowing in front and rear ends of said central manifold portion.
The method of claim 1,
And said cooling fluid is liquid oxygen.

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