KR20170069666A - Cooling apparatus of after flame gas - Google Patents

Cooling apparatus of after flame gas Download PDF

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Publication number
KR20170069666A
KR20170069666A KR1020150177163A KR20150177163A KR20170069666A KR 20170069666 A KR20170069666 A KR 20170069666A KR 1020150177163 A KR1020150177163 A KR 1020150177163A KR 20150177163 A KR20150177163 A KR 20150177163A KR 20170069666 A KR20170069666 A KR 20170069666A
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KR
South Korea
Prior art keywords
inner tube
coolant
tube
outside
flow path
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KR1020150177163A
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Korean (ko)
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KR101772774B1 (en
Inventor
임하영
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한국항공우주연구원
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Priority to KR1020150177163A priority Critical patent/KR101772774B1/en
Publication of KR20170069666A publication Critical patent/KR20170069666A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/97—Rocket nozzles
    • F02K9/972—Fluid cooling arrangements for nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The present invention relates to a wake gas cooling apparatus, and more particularly, to a wake gas cooling apparatus for cooling a high temperature combustion gas discharged from a rocket engine or the like.

Description

[0001] COOLING APPARATUS OF AFTER FLAME GAS [0002]

The present invention relates to a wake gas cooling apparatus, and more particularly, to a wake gas cooling apparatus for cooling a high temperature combustion gas discharged from a rocket engine or the like.

Generally, a method of supplying cooling water to cool a wake gas, which is a combustion gas discharged from a rocket engine, is used.

Korean Patent Registration No. 10-446333 discloses such an injector for cooling a wake gas of a liquid rocket engine.

However, such a conventional injector for cooling the downstream gas has a problem that mixing of the combustion gas with the coolant is not effective by injecting the coolant only in the linear direction.

Korean Registered Patent No. 10-446333 (September 01, 2004)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a downstream gas cooling apparatus for cooling a high temperature combustion gas discharged from a rocket engine or the like.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides an air conditioner comprising: an inner tube having an upper end formed with an inlet through which coolant is supplied from the outside, and a lower end formed with a discharge port through which refrigerant flows; An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube; The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And a diffusing means provided at the discharge port and adapted to diffuse the coolant discharged to the outside, wherein the inner tube is protruded outward along the circumference of the outer circumference to contact the outer tube, A plurality of ribs extending in the longitudinal direction of the inner tube are formed, and coolant flowing into the flow path space passes between the ribs.

According to another aspect of the present invention, there is provided an air conditioner, comprising: an inner tube having an upper end formed with an inlet through which a coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows; An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube; The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And a diffusing means for diffusing the coolant discharged to the outside, wherein the flow rate adjusting member is coupled to the inside of the distributor and controls the flow rate of the coolant passing through the distributor, The present invention also provides a wedge gas cooling apparatus.

The distributor according to the present invention is characterized in that the distributor has a main flow path for allowing coolant supplied from the outside to be supplied from the outside while being supplied to the inner pipe with both end portions opened and a plurality of distribution flow paths communicating with the main flow path, And the flow rate regulating member is formed of an orifice and a screw thread is formed on an outer peripheral surface of the flow rate regulating member so as to be threaded around the main flow path.

The plurality of ribs according to the present invention are each formed in a spiral shape.

The plurality of ribs according to the present invention are characterized by forming a mixing space in which a lower end portion is positioned above the lower end portion of the inner tube and a coolant passing between the ribs is mixed therebetween.

The plurality of ribs according to the present invention are characterized in that coolant flowing into the flow path space is passed while both ends of the ribs are opened.

The plurality of ribs according to the present invention each have a temperature at which a coolant passing between the first rib unit and the second rib unit is branched and mixed with the first, Thereby forming a holding space.

The plurality of first and second rib units and the plurality of second and third rib units according to the present invention are arranged to be shifted from each other.

According to another aspect of the present invention, there is provided an air conditioner, comprising: an inner tube having an upper end formed with an inlet through which a coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows; An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube; The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And a diffusing means provided at the discharge port and adapted to diffuse the coolant discharged to the outside, characterized by further comprising pressure intensifying means for increasing the pressure of the coolant discharged from the flow path space Thereby providing a wake gas cooling device.

The pressure intensifying means according to the present invention is characterized in that the pressure intensifying means comprises a protruding protrusion protruding from at least one of an outer peripheral surface of a lower end portion of the inner tube and an inner peripheral surface of a lower end portion of the outer tube.

According to another aspect of the present invention, there is provided an air conditioner, comprising: an inner tube having an upper end formed with an inlet through which a coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows; An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube; The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And a diffusing means provided at the discharge port and adapted to diffuse the coolant discharged to the outside, wherein the diffusing means comprises: a diffusion plate positioned below the lower end of the outer tube; A fixing plate fixed to an inner peripheral surface of the inner tube; And a connection bar connecting the diffusion plate and the fixing plate, wherein the diffusion plate has a conical shape whose upper surface is inclined, and the diameter of the diffusion plate is greater than or equal to the outer diameter of the outer tube Thereby providing a wake gas cooling device.

The diffuser plate according to the present invention is characterized in that the upper surface has a plurality of helical projections extending from a central portion to an outer peripheral surface and a plurality of auxiliary helical projections provided between adjacent helical projections, And extending from the outer circumferential surface of the diffuser plate toward the central portion, and being formed to be shorter than the spiral protrusions.

According to the present invention, the temperature of the combustion gas can be effectively lowered by injecting the coolant into the high temperature combustion gas discharged from the liquid rocket engine or the like.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a side view of a wake gas cooling apparatus according to the present invention.
2 is a longitudinal sectional view showing a wedge gas cooling apparatus according to the present invention.
3 is a longitudinal sectional view showing the inner and outer tubes in the wedge gas cooling apparatus according to the present invention.
FIG. 4 is a plan view showing a diffusion plate in a wedge gas cooling apparatus according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, the wake gas cooling apparatus 1 according to the present invention includes an inlet 11 through which a coolant is supplied from the outside to an upper end thereof, and a discharge port 12 An outer tube 20 provided on the outer side of the inner tube 10 and forming a flow path space A between the inner tube 10 and the inner tube 10, The upper portion of the flow path space A which is located inside the outer tube 20 and is coupled to the inlet port 11 to block the upper portion of the flow path space A while the coolant supplied from the outside is branched, A distributor 30 to be supplied to the flow path space A and diffusion means 40 provided in the discharge port 12 to diffuse the coolant discharged to the outside.

The wake gas can be understood as a high-temperature combustion gas discharged from a rocket engine or the like, and the wake gas cooling apparatus 1 allows the coolant supplied from the outside to be injected as a wake gas.

The coolant preferably consists of water and cools the wake gas as it is sprayed with the wake gas.

At this time, it is preferable that the coolant is injected in the direction of the flow of the wake gas.

As shown in FIG. 1, the downstream gas cooler 1 is connected to another coolant supply device or the like through the inlet 11, and the coolant supplied from the coolant supply device may be injected as a downstream gas.

The outer tube 20 is preferably made of a copper alloy or the like having excellent heat transfer characteristics and is located outside the inner tube 10 to protect the inner tube 10 from the wake gas.

The outer tube 20 is heated to a high temperature while abutting or contacting the wake gas. The outer tube 20 is cooled by the coolant passing through the flow path space A and is prevented from being damaged by high temperature.

That is, the coolant passing through the flow path space A cools the outer tube 20 heated by the wake gas and blocks the heat transmitted from the outer tube 20 to the inner tube 10 .

The distributor 30 is connected to the inner circumferential surface of the outer tube 20 at an upper portion thereof and blocks the upper portion of the flow path space A which is opened and the inlet 11 is connected to the lower portion.

The distributor 30 is preferably made of stainless steel. As shown in FIG. 2, the distributor 30 includes a main flow path 31 through which coolant supplied from the outside is supplied to the inner pipe 10 while both ends are opened, (32) communicating with the flow path (31) and supplying the coolant to the flow path space (A) are formed.

Since the distributor 30 is already known and used, a detailed description thereof will be omitted.

The wedge gas cooling apparatus 1 may further include a flow rate adjusting member 50 coupled to the inside of the distributor 30 to adjust a flow rate of the coolant passing through the distributor 30.

The flow regulating member 50 may be formed of a general type orifice and may be screwed around the inside of the distributor 30, that is, the periphery of the main flow path 31, for easy separation and replacement.

For this purpose, the distributor 30 may have threads formed on the inner circumferential surface thereof, and the flow control member 50 may have threads formed on the outer circumferential surface thereof.

The inner tube 10 is formed with a plurality of ribs 13 protruding outward on the outer circumferential surface and in contact with the outer tube 20 and having both ends extending in the longitudinal direction of the inner tube 10.

3, the plurality of ribs 13 stably support the outer tube 20 from the inner tube 10 while both ends extend in the longitudinal direction of the inner tube 10, The coolant flowing into the flow path space A passes along the ribs 13 and can be discharged to a lower portion of the flow path space A.

The plurality of ribs 13 may have a tube shape in which both end portions thereof are opened so that the coolant flowing into the flow path space A can pass therethrough.

Most preferably, the plurality of ribs 13 are formed in a spiral shape.

This is because the coolant passing between the ribs 13 passes through the outer tube 20 in a swirling manner and passes through the outer tube 20 in a straight line along the longitudinal direction of the outer tube 20, So that the cooling efficiency can be expected to increase with an increase in the contact area and the like.

Accordingly, the coolant passing through the inner and outer pipes 10 and 20 can be evenly contacted with the outer pipe 20, thereby preventing the outer pipe 20 heated by the wake gas from being damaged .

2, the lower ends of the plurality of ribs 13 are positioned above the lower end of the inner tube 10, and the coolant passing through the ribs 13 passes through the mixing spaces B ) Can be formed.

The mixing space B allows the coolant passing between the ribs 13 to mix and mix and to have the same temperature while being discharged to the lower portion of the flow path space A and discharged to the discharge port 12 Mixed with coolant.

This is to prevent the cooling efficiency from dropping due to vaporization due to the temperature rise in the process of directly discharging the coolant passing between the ribs 13 to the lower portion of the flow path space A.

In other words, the coolant passing between the ribs 13 is discharged to the lower portion of the flow path space A through the ribs 13, Thereby preventing the deterioration of the cooling efficiency.

To this end, the plurality of ribs 13 may be divided into a plurality of first, second, and third rib units 14, 15, 16, respectively, to form a temperature holding space C therebetween.

The temperature holding space C is formed between the first and second rib units 14 and 15 and between the second and third rib units 15 and 16, So that the coolant passing between the rib units 15 is mixed and advanced.

That is, the temperature holding space C allows the coolant passing between each of the first rib units 14 to be mixed and have the same temperature, while the second rib unit 15 ).

In addition, the coolant passing between the second rib units 15 can be mixed to have the same temperature, and can be introduced between the third rib units 16 in the same temperature state .

Since the ribs 13 are formed by the length of the inner tube 10, the coolant passing between the ribs 13 is prevented from vaporizing while rising to a certain temperature or higher, Thereby preventing the outer tube 20 from being damaged.

At this time, it is preferable that the first, second, and third rib units 14, 15, and 16 are disposed to be shifted from each other as shown in FIG.

For example, the second rib unit 15 may be disposed in a line between the first rib units 14, or the first rib unit 14 may be disposed between the second rib units 15, As shown in FIG.

The third rib unit 16 may be arranged so as to be located on the same line between the second rib units 15 or the second rib unit 15 may be positioned between the third rib units 16 on the same line Respectively.

This is because the contact time between the coolant and the outer tube 20 or the contact time between the first rib unit 14 and the second rib unit 15 and between the third rib unit 16 and the outer tube 20 , The contact area and the like are increased, so that the improvement of the cooling efficiency can be expected.

The wedge gas cooling apparatus 1 may be provided with a pressure intensifier 60 for increasing the pressure of the coolant discharged from the flow path space A and increasing the boiling point of the coolant.

The pressure enhancing means 60 may include a protruding protrusion 61 protruding from at least one of an outer peripheral surface of a lower end portion of the inner tube 10 and an inner peripheral surface of a lower end portion of the outer tube 20.

The projecting step 61 narrows the lower portion of the flow path space A through which the coolant is discharged, so that the discharge pressure of the coolant can be increased.

The diffusion means 40 includes a diffusion plate 41 positioned below the lower end of the outer tube 20, a fixing plate 42 fixed to the inner circumferential surface of the inner tube 10, And a connecting bar 43 connecting the connecting bar 42 with the connecting bar 43.

A plurality of hollows 42a are formed in the fixing plate 42 to allow the coolant to pass therethrough.

The connection bar 43 connects the central part of the fixing plate 42 and the central part of the diffusion plate 41 and may be connected in various known ways.

The diffusion plate 41 preferably has a conical shape whose upper surface is inclined and has a diameter that is greater than or equal to an outer diameter of the outer tube 20. [

As shown in FIG. 4, the diffusion plate 41 may have a plurality of spiral protrusions 44 formed on its upper surface.

The plurality of helical projections 44 may extend from the central portion of the diffusion plate 41 to the outer circumferential surface.

The diffuser plate 41 may further include a plurality of auxiliary spiral protrusions 45 provided between adjacent spiral protrusions 44 on the upper surface thereof.

The auxiliary spiral protrusions 45 are formed to extend from the outer circumferential surface of the diffusion plate 41 in the central direction and are formed to be shorter than the spiral protrusions 44.

The coolant discharged from the flow path space A and the discharge port 12 can be spread by being rotated by the plurality of helical projections 44 and the plurality of auxiliary helical projections 45.

It is to be understood that the present invention is not limited to the above-described embodiment, but may be modified and changed without departing from the spirit and scope of the present invention as set forth in the following claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

1: Wake gas cooling device 10: Internal tube
11: inlet 12: outlet
13: rib 14: first rib unit
15: second rib unit 20: outer tube
30: Distributor 31: Main channel
32: distribution channel 40: diffusion means
41: diffusion plate 42: fixed plate
42a: hollow 43: connecting bar
44: spiral projection 45: auxiliary spiral projection
50: flow rate regulating member 60: pressure increasing means
61: protruding chin A: channel space
B: mixed space C: temperature holding space

Claims (12)

An inner tube having an upper end formed with an inlet through which coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows;
An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube;
The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And
And a diffusion means provided in the discharge port and adapted to diffuse the coolant discharged to the outside,
The internal tube
A plurality of ribs protruding outward along the circumference on the outer circumferential surface and in contact with the outer tube, both ends of which extend in the longitudinal direction of the inner tube,
The coolant, which flows into the flow path space,
And passes through the ribs. An inner tube having an upper end formed with an inlet through which coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows;
An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube;
The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And
And a diffusion means provided in the discharge port and adapted to diffuse the coolant discharged to the outside,
Further comprising a flow rate adjusting member coupled to the inside of the distributor to adjust a flow rate of the coolant passing through the distributor. 3. The method of claim 2,
The distributor comprises:
A main flow path for allowing coolant supplied from the outside to be supplied to the inner pipe while both ends are opened and a plurality of distribution paths communicating with the main flow path and supplying the coolant to the flow path space are formed,
At the periphery of the main flow passage,
A thread is formed on the inner peripheral surface,
Wherein the flow rate control member comprises:
And a screw thread is formed on an outer circumferential surface of the orifice so as to be screwed around the main flow passage. The method according to claim 1,
The plurality of ribs
Wherein each of the cooling units is formed in a spiral shape. 5. The method of claim 4,
The plurality of ribs
And the lower end of the inner tube is positioned above the lower end of the inner tube, and a coolant passing between the ribs is mixed therewith. The method according to claim 1,
The plurality of ribs
And the coolant flowing into the flow path space is passed through the both ends of the cooler. The method according to any one of claims 1, 4, 5 and 6,
The plurality of ribs
And a temperature holding space for dividing the first and second rib units into a plurality of first, second and third rib units and allowing the coolant passing between the first rib units and between the first and second rib units to mix and proceed, Gas cooling system. 8. The method of claim 7,
The plurality of first and second rib units and the plurality of second and third rib units,
And are arranged to be shifted from each other. An inner tube having an upper end formed with an inlet through which coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows;
An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube;
The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And
And a diffusion means provided in the discharge port and adapted to diffuse the coolant discharged to the outside,
Further comprising pressure intensifying means for increasing the pressure of the coolant discharged from the flow path space. 10. The method of claim 9,
The pressure-
And a protruding protrusion protruding from at least one of an outer peripheral surface of a lower end portion of the inner tube and an inner peripheral surface of a lower end portion of the outer tube. An inner tube having an upper end formed with an inlet through which coolant is supplied from the outside and a lower end formed with a discharge port through which refrigerant flows;
An outer tube provided on the outer side of the inner tube and forming a flow path space having upper and lower openings between the inner tube and the inner tube;
The upper portion is coupled to the inner circumferential surface of the outer tube and the lower portion is coupled to the inlet to block the upper portion of the open channel space while allowing the coolant supplied from the outside to flow into the channel space together with the inner tube Distributor; And
And a diffusion means provided in the discharge port and adapted to diffuse the coolant discharged to the outside,
The diffusion means,
A diffusion plate positioned below the lower end of the outer tube;
A fixing plate fixed to an inner peripheral surface of the inner tube; And
And a connection bar connecting the diffusion plate and the fixing plate,
The diffuser plate
Wherein the upper surface is formed in a conical shape having an inclined shape and the diameter is formed to be equal to or larger than the outer diameter of the outer tube. 12. The method of claim 11,
The diffuser plate
A plurality of helical projections extending from the central portion to the outer peripheral surface on the upper surface and
A plurality of auxiliary spiral projections formed between adjacent helical projections are formed,
Wherein the plurality of auxiliary spiral projections
Wherein each of the spiral protrusions is formed to extend from an outer circumferential surface of the diffuser plate toward a central portion thereof, and is formed to be shorter than the spiral protrusions.
KR1020150177163A 2015-12-11 2015-12-11 Cooling apparatus of after flame gas KR101772774B1 (en)

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KR101772774B1 KR101772774B1 (en) 2017-08-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3158024B2 (en) * 1995-11-14 2001-04-23 宮川工業株式会社 Distributor and Distributor Connection Method
KR100446333B1 (en) * 2002-07-23 2004-09-01 주식회사 로템 Cooling water injector for after flame gas of fluid fuel rocket engine
WO2004058218A2 (en) * 2002-12-30 2004-07-15 Nektar Therapeutics Prefilming atomizer
KR200331022Y1 (en) * 2003-07-31 2003-10-22 주식회사 포스코 Apparatus for guinding fire of tundish preheating burner

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