CN204988734U - Experimental gas diffuser of using of engine - Google Patents
Experimental gas diffuser of using of engine Download PDFInfo
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- CN204988734U CN204988734U CN201520605906.6U CN201520605906U CN204988734U CN 204988734 U CN204988734 U CN 204988734U CN 201520605906 U CN201520605906 U CN 201520605906U CN 204988734 U CN204988734 U CN 204988734U
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- gas diffuser
- combustion gas
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- liquid collecting
- collecting ring
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Abstract
The utility model belongs to the technical field of aviation, space flight, the experimental gas diffuser that uses of concretely relates to space flight liquid oxygen kerosene engine. This gas diffuser includes the cooling water passageway, the cooling water passageway includes a N frid and a N apron constitution of even installation on the barrel circumferencial direction, the frid comprises bottom plate and curb plate, its characterized in that: bottom plate and apron are arc. The utility model discloses effectively reduce the hot stress concentration of cooling water passageway welding seam position, avoid surpassing its welding allowable stress to under the pulsation repeatedly of gas was strikeed, the difficult plastic deformation that takes place was difficult for arousing welding seam defect or fracture, promotes gas diffuser structural strength, has improved product quality and reliability.
Description
Technical field
The utility model belongs to Aeronautics and Astronautics technical field, relates to a kind of combustion gas diffuser, is specifically related to the combustion gas diffuser that a kind of space flight oxygen kerosene engine test uses.
Background technology
When development of new Upper Stage rocket engine, one of vital task when the high-altitude characteristic determining rocket engine is engines ground test run.The thrust of rocket engine constantly increases along with the rising of height, until reach maximum thrust in vacuum environment, the environmental stress during work of Upper Stage rocket engine is very low, must set up the high-altitude characteristic of the low pressure vacuum environment ability real simulation rocket engine under corresponding height when ground run.When simulated altitude is not too large, generally the environment under low pressure needed for test set up by employing combustion gas diffuser.
In altitude simulation test, the simplest air suction mode applied by combustion gas diffuser, and its typical structure is socketed a supersonic diffuser on engine jet pipe.One end of diffuser connects with the vacuum chamber of test, and the other end communicates with air, and the gas injection of jet pipe is to the entrance of diffuser.The gas of swiftly flowing combustion gas to surrounding has ejector action, makes test vacuum chamber engine place produce and maintain the environment under low pressure lower than atmospheric pressure.
Due to engine gas temperature very high (combustion gas stagnation temperature about 4000K), usually need to carry out thermal protection to combustion gas diffuser.
Now, the combustion gas diffuser thermal protection of main flow adopts structure as shown in Figure 1: comprise cylindrical shell 1, entrance that the outlet of the cooling-water duct 2 arranged on cylindrical shell 1, diffuser is provided with into water liquid collecting ring 3, diffuser is provided with water outlet liquid collecting ring 4.Due to the effect of diffuser injection, endpiece
Temperature is the highest, for ensureing cooling effect, adopts endpiece water inlet form and inlet end water outlet form.Wherein, intake liquid collecting ring 3 is welded with on multiple tangential oral siphon 5, water outlet liquid collecting ring 4 and be welded with multiple tangential rising pipe 6; Cooling-water duct 2 is communicated with 4 respectively at water inlet liquid collecting ring 3 with water outlet liquid collecting ring;
As shown in Figure 2, the cooling-water duct 2 of prior art is included in the N number of frid 7 circumferentially evenly installed and N number of cover plate composition of cylindrical shell 1; Frid 7 is in sheet material basis upper hem and bending, forms the right angle U-type groove of 90o.The openend of frid 7 welds with cylindrical shell 1 outer wall, and the length of frid 7 is consistent with the distance between water inlet liquid collecting ring 3 and water outlet liquid collecting ring 4; Cover plate 8 (namely circumferencial direction arranges N number of cover plate, and N number of cover plate and N number of frid define cooling-water duct) is installed between every two adjacent frids 7; Cover plate 8 is flat type, and length is consistent with frid; Frid 7 comprises two side plates 9 and connects the base plate 10 of two side plates; Its latus inframedium 9 is flat type with base plate 10.
Wherein, water inlet liquid collecting ring 3 and water outlet liquid collecting ring 4 are all welded on cylindrical shell, and one week multiple external reinforcing muscle 11 of uniform welding, lift structure intensity.Wherein, multiple external reinforcing muscle 11 is separately positioned on into water liquid collecting ring 3 (or water outlet liquid collecting ring 4) two ends lateral surface;
In cooling procedure, chilled water enters in cooling-water duct 2 from the multiple tangential oral siphon 5 of water inlet liquid collecting ring 3, flows out, thus takes away heat, realize the cooling of diffuser from the multiple tangential rising pipe 6 water outlet liquid collecting ring 4.
The amount of heat of existing combustion gas diffuser internal high temperature combustion gas is taken away by chilled water, and chilled water heats up.But also have a large amount of fuel gas temperature to act on cylindrical shell, cylindrical shell at high temperature can cause thermal stress dilatational strain.Frid is connected by weld seam with cover plate, and its weld strength is lower than material matrix intensity, and therefore position while welding easily causes stress to concentrate, and may exceed its welding permissible stress.Simultaneously under the pulsatile impact repeatedly of combustion gas, easily there is plastic yield, cause weld defect or cracking, cause chilled water Seepage.
The homogeneous all uniform welding external reinforcing muscle 11 of existing combustion gas diffuser water inlet liquid collecting ring both sides external, for promoting water inlet liquid collecting ring 11 structural strength.Because combustion gas diffuser exit end is liquid collecting ring water inlet end, thus diffuser exit end is welded with external reinforcing muscle 11, cannot realize the cooling of diffuser exit end gross area.Due to combustion gas diffuser ejector action, diffuser exit end temperature is the highest, and washes away at a high speed by gas particle, and cooling effect is poor, and heat etching phenomenon very easily appears in diffuser exit terminal material, causes material corrosion to destroy, and reduces diffuser reliability.
Utility model content
In order to solve the cooling-water duct of combustion gas diffuser in background technology under the pulsatile impact repeatedly of combustion gas, plastic yield can occur, thus causing the problem of weld defect or cracking, the utility model provides a kind of engine test combustion gas diffuser.
The concrete technical scheme that the utility model is dealt with problems is:
A kind of engine test combustion gas diffuser,
Comprise cylindrical shell, cooling-water duct, water inlet liquid collecting ring, described cooling-water duct is included in the N number of frid and N number of cover plate composition that cylindrical shell circumferentially evenly installs; Described frid is made up of base plate and side plate; It is characterized in that: the cross section of described base plate and cover plate is circular arc.
Above-mentioned water inlet liquid collecting ring is welded on cylindrical shell by multiple outer wall reinforcement and multiple internal stiffeners.
The water flowing breach that UI water (flow) direction is vertical is offered between above-mentioned internal stiffeners and the inwall of water inlet liquid collecting ring.
Above-mentioned base plate is made by the technique of bending; The span of described base plate radius-of-curvature is between 2mm-5mm.
Above-mentioned cover plate is made by the technique of bending; The span of the radius-of-curvature of described cover plate is 20mm-40mm.
The beneficial effects of the utility model are:
1, the base plate of U-type groove plate of the present utility model and cover plate are all radian plates, have certain curvature radius, can eliminate part thermal stress by self-deformation, and the thermal stress effectively reducing position while welding is concentrated, and avoid exceeding its welding permissible stress.Thus under the pulsatile impact repeatedly of combustion gas, not easily there is plastic yield, not easily cause weld defect or cracking, promote combustion gas diffuser structure intensity, improve product quality and reliability.
2, water inlet liquid collecting ring of the present utility model adopts internal stiffeners to be connected with cylindrical shell, solves the heat etching problem of diffuser exit end by high-temperature fuel gas.
3, water flowing breach is offered between internal stiffeners of the present utility model and water inlet liquid collecting ring inwall, reduce water flow inside flow resistance, improve the circulation effect into water liquid collecting ring, avoid cooling dead angle in proof strength simultaneously, realize the cooling of diffuser exit end entire area.
Accompanying drawing explanation
Fig. 1 is the structure diagram of existing combustion gas diffuser;
Fig. 2 is the structure diagram of existing cooling-water duct;
Fig. 3 is the structure diagram of the utility model combustion gas diffuser;
Fig. 4 is the structure diagram of the utility model cooling-water duct;
Fig. 5 is the structure diagram of the utility model diffuser exit.
Embodiment
In order to solve the cooling-water duct of combustion gas diffuser in background technology under the pulsatile impact repeatedly of combustion gas, can there is plastic yield, thus cause the problem of weld defect or cracking in the utility model, now propose a kind of engine test combustion gas diffuser.
As Fig. 3, the entrance that combustion gas diffuser comprises cylindrical shell 1, the outlet of the cooling-water duct 2 arranged on cylindrical shell 1, diffuser is provided with into water liquid collecting ring 3, diffuser is provided with water outlet liquid collecting ring 4.Due to the effect of diffuser injection, discharge-end temperature is the highest, for ensureing cooling effect, adopts endpiece water inlet form and inlet end water outlet form.Wherein, intake liquid collecting ring 3 is welded with on multiple tangential oral siphon 5, water outlet liquid collecting ring 4 and be welded with multiple tangential rising pipe 6; Cooling-water duct 2 is communicated with 4 respectively at water inlet liquid collecting ring 3 with water outlet liquid collecting ring;
As shown in Figure 4, cooling-water duct of the present utility model is included in N number of frid 7 that cylindrical shell circumferentially evenly installs and N number of cover plate 8 forms; Described frid 7 is made up of base plate 9 and side plate 10; Special feature is: base plate 9 and the cover plate 8 of frid 7 are circular-arc-shaped design, and wherein, base plate 9 is made by the technique of bending; The span of base plate 9 radius-of-curvature is between 2mm-5mm.Cover plate 8 is made by the technique of bending; The span of the radius-of-curvature of cover plate 8 is 20mm-40mm.
Part thermal stress can be eliminated by self-deformation by above-mentioned design frid and base plate, the thermal stress effectively reducing frid and base plate position while welding is concentrated, avoid exceeding its welding permissible stress, thus under the pulsatile impact repeatedly of combustion gas, not easily there is plastic yield, not easily cause weld defect or cracking, promote combustion gas diffuser structure intensity, improve product quality and reliability.
In addition, the improvements illustrated also are needed to be: as shown in Figure 5, the water inlet liquid collecting ring 3 of diffuser exit of the present utility model is welded on cylindrical shell 1 by multiple outer wall reinforcement 11 and multiple internal stiffeners 12, solve the heat etching problem of diffuser exit end by high-temperature fuel gas, the water flowing breach 13 vertical with water (flow) direction is offered between internal stiffeners with the inwall of water inlet liquid collecting ring, reduce into water liquid collecting ring water flow inside flow resistance, improve the circulation effect into water liquid collecting ring, avoid cooling dead angle in proof strength simultaneously, realize the cooling of diffuser exit end entire area.
Claims (5)
1. an engine test combustion gas diffuser, comprises cylindrical shell, cooling-water duct, water inlet liquid collecting ring, and described cooling-water duct is included in the N number of frid and N number of cover plate composition that cylindrical shell circumferentially evenly installs; Described frid is made up of base plate and side plate; It is characterized in that: the cross section of described base plate and cover plate is circular arc.
2. engine test combustion gas diffuser according to claim 1, is characterized in that: water inlet liquid collecting ring is welded on cylindrical shell by multiple outer wall reinforcement and multiple internal stiffeners.
3. engine test combustion gas diffuser according to claim 2, is characterized in that: offer the water flowing breach that UI water (flow) direction is vertical between described internal stiffeners and the inwall of water inlet liquid collecting ring.
4. the engine test combustion gas diffuser according to claim 1 or 2 or 3, is characterized in that: described base plate is made by the technique of bending; The span of described base plate radius-of-curvature is between 2mm-5mm.
5. the engine test combustion gas diffuser according to claim 1 or 2 or 3, is characterized in that: described cover plate is made by the technique of bending; The span of the radius-of-curvature of described cover plate is 20mm-40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520605906.6U CN204988734U (en) | 2015-08-12 | 2015-08-12 | Experimental gas diffuser of using of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520605906.6U CN204988734U (en) | 2015-08-12 | 2015-08-12 | Experimental gas diffuser of using of engine |
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| Publication Number | Publication Date |
|---|---|
| CN204988734U true CN204988734U (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520605906.6U Active CN204988734U (en) | 2015-08-12 | 2015-08-12 | Experimental gas diffuser of using of engine |
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| CN (1) | CN204988734U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403661A (en) * | 2016-10-19 | 2017-02-15 | 北京航天长征飞行器研究所 | Low-speed cooling water thermal protection device |
| CN114166511A (en) * | 2021-10-20 | 2022-03-11 | 中国航发四川燃气涡轮研究院 | High-altitude cabin and exhaust diffuser connecting and positioning structure and high-altitude simulation test equipment |
-
2015
- 2015-08-12 CN CN201520605906.6U patent/CN204988734U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403661A (en) * | 2016-10-19 | 2017-02-15 | 北京航天长征飞行器研究所 | Low-speed cooling water thermal protection device |
| CN114166511A (en) * | 2021-10-20 | 2022-03-11 | 中国航发四川燃气涡轮研究院 | High-altitude cabin and exhaust diffuser connecting and positioning structure and high-altitude simulation test equipment |
| CN114166511B (en) * | 2021-10-20 | 2023-05-05 | 中国航发四川燃气涡轮研究院 | High altitude cabin and exhaust diffuser connection positioning structure and high altitude simulation test equipment |
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