CN202973093U - Sudden expansion type bluff body flame stabilizer - Google Patents
Sudden expansion type bluff body flame stabilizer Download PDFInfo
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- CN202973093U CN202973093U CN 201220736137 CN201220736137U CN202973093U CN 202973093 U CN202973093 U CN 202973093U CN 201220736137 CN201220736137 CN 201220736137 CN 201220736137 U CN201220736137 U CN 201220736137U CN 202973093 U CN202973093 U CN 202973093U
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- bluff body
- sudden expansion
- cavity
- rear bluff
- expansion type
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Abstract
The utility mode discloses a sudden expansion type bluff body flame stabilizer. The sudden expansion type bluff body flame stabilizer is formed by a front bluff body and a rear bluff body, wherein the front bluff body and the rear bluff body are arranged inside a combustion chamber and are fixed on the side wall of an engine case body, and a cavity is formed between the front bluff body and the rear bluff body. The sudden expansion type bluff body flame stabilizer is characterized in that the rear bluff body is formed by an upper rear bluff body and a lower rear bluff body, wherein the upper rear bluff body and the lower rear bluff body are completely identical in shape and arranged in an up-and-down symmetrical mode. The shapes of the upper rear bluff body and the lower rear bluff body are both cubes with corners cut, the opposite surfaces of the front ends of the upper rear bluff body and the lower rear bluff body are both planes, a sudden expansion flowing channel is formed between the upper rear bluff body and the lower rear bluff body, the front end of the sudden expansion flowing channel is communicated with the cavity, the rear end of the sudden expansion flowing channel is communicated with a recirculation zone on the rear portion of the rear bluff body, and the shape of the rear end of the sudden expansion flowing channel is of a bugle shape with a backward opening. The sudden expansion type bluff body flame stabilizer fully uses high temperature backflow formed in the rear portion of the rear bluff body, ejects the high temperature backflow into the cavity formed between the front bluff body and the rear bluff body to elevate the total temperature in the cavity and enhance vortex flow, and therefore a vortex structure is stable and symmetrical, and combustion efficiency and flame stability are further improved.
Description
Technical field
The utility model relates to the flame stabilizer of engine chamber, especially relates to a kind of expansion type bluff body flameholder.
Background technology
U.S. Ramgen power systems company is on the basis at standing vortex burning chamber in 2006, proposed the concept of advanced vortex combustion cavity (Advanced Vortex Combustor-AVC), this combustion chamber mainly applies to its Novel rotary punching engine that integrates punching engine and gas turbine of developing.
the indoor flame stabilization of advanced vortex combustion mainly adopts the steady flame mode of bluff body, it is different from traditional bluff body flameholder part and is: two bluff bodies have been arranged in its front and back in the combustion chamber, form a cavity between the bluff body of front and back, when incoming flow passes through cavity, the effect of entrainmenting due to cavity, make in cavity and can form the backflow spiral structure, spiral structure is under the covering of front bluff body, not affected by main flow, realize comparatively stable burning in cavity, form simultaneously stable flame on duty zone, and thereby high-temperature combustion product is transported out the cavity main flow of igniting, play the retention flame and the effect of igniting.So in cavity, the interior temperature of the stability of spiral structure and cavity has a great impact for the stable and effect of igniting of flame.
Studies show that, although advanced vortex combustion has simple in structure, the characteristics such as efficiency of combustion is high and pollutant emission is low than standing vortex burning chamber, but it is difficult for forming symmetrical stable spiral structure in cavity, its reason is: 1, when mainstream speed is too high or too low, (normal ranges is 10m/s-40m/s) to average flow velocity not in the velocity interval that forms the retention flame in cavity; 2, when fuel adopts the transverse jet mode to enter the combustion chamber, jet is larger on cavity flow field (especially spiral structure) impact.
For the problems referred to above, external research there is not yet report, and domestic research concentrates at the wall of cavity and arranges jet orifice, sprays into fuel or air by mode of jet in cavity, thereby reaches the momentum increment that improves in cavity, strengthens the purpose of vortex motion.And this in the cavity mode of spray fuel or air have many-sided limitation, one comes the pitot loss that will certainly increase the combustion chamber that sprays into of fuel and air, two increase fuel consumption, the 3rd, the complexity of increase chamber structure technique, and the amount of spray fuel and air is not easy to control.
Summary of the invention
The purpose of this utility model is to provide a kind of can be under various inlet speed and different fuel injection mode to be provided stable large scale vortex incendiary source on duty, realizes the expansion type bluff body flameholder of efficient stable burning for main combustion, this flameholder is not in the situation that have the cavity jet orifice to arrange, can take full advantage of the high temperature reflux that forms after bluff body, strengthen the vortex motion in cavity, make spiral structure stable symmetrical, improve efficiency of combustion and flame holding, and simple in structure, weight is lighter.
The purpose of this utility model is achieved in that
a kind of expansion type bluff body flameholder, formed by the front bluff body and the rear bluff body that are in the combustion chamber and be fixed on the engine shell body sidewall, the front bluff body side of being shaped as body, form cavity between front bluff body and rear bluff body, feature is: rear bluff body is identical and be symmetrical upper rear bluff body and the lower rear bluff body of placing in up and down and form by two shapes, after upper, the shape of bluff body and lower rear bluff body is corner cut side's body, after upper, bluff body is the plane with the relative face of lower rear bluff body front end, form the sudden expansion circulation road between upper rear bluff body and lower rear bluff body, the front end of sudden expansion circulation road is communicated with cavity, the recirculating zone of bluff body back after the rear end of sudden expansion circulation road is communicated with, the rear end of sudden expansion circulation road is shaped as the horn-like of backward opening.
After upper, the length of bluff body two minor faces is to 0.1-0.9 of edge lengths, and the length of lower rear bluff body two minor faces is to 0.1-0.9 of edge lengths.
Hypotenuse after upper after bluff body and lower rear bluff body corner cut is straight line or circular arc.
The height of rear bluff body is less than the height of front bluff body, and the length of cavity is no more than the height of front bluff body.
The center of the center of sudden expansion circulation road and front bluff body height is on same level.
The utility model rear bluff body that engine combustion is indoor is divided into two, form the sudden expansion circulation road between the symmetrical upper rear bluff body of placing in up and down and lower rear bluff body, the rear end of sudden expansion circulation road is shaped as the horn-like of backward opening, be that the sudden expansion circulation road is similar to " funnel " shape, the sudden expansion circulation road is communicated with cavity between front bluff body and rear bluff body and the recirculating zone of rear bluff body back.Being connected with cavity than the small size cross section of sudden expansion circulation road, can be by the distance adjustment between upper rear bluff body and lower rear bluff body than the size that small size cuts; The larger area cross section is connected with the recirculating zone of rear bluff body back, the size in larger area cross section is regulated by hypotenuse and two short right-angle side length, the length of the two short right-angle sides that after upper, bluff body is relative with lower rear bluff body is separately to 0.1-0.9 of edge lengths, and hypotenuse can be right angle hypotenuse or circular arc.
operation principle of the present utility model is: due to covering of rear bluff body, main current flow through after during bluff body can after the recirculating zone of bluff body back produce the backflow vortex, backflow vortex fluid carries over by the sudden expansion circulation road and arrives cavity, because of dwindling of sudden expansion circulation road sectional area, cause flowing pressure to reduce, speed increases, thereby the recirculating zone high-temperature combustion product injection cavity with rear bluff body back, increase the bulk temperature in cavity, help the main flow of igniting, increase simultaneously the speed increment in cavity, strengthen vortex motion, on the other hand, be positioned at the center of cavity due to the backflow Injection Section, the reflux layer isolation that makes the top and the bottom vortex of cavity be injected into, there is no influencing each other of fluid inflow between vortex, this helps the stable and symmetrical of spiral structure.
Therefore, the utility model compared with prior art has following characteristics:
(1) the utility model takes full advantage of the high-temperature product of rear bluff body recirculating zone, and with the high-temperature product introducing cavity of rear bluff body recirculating zone, reaching increases the cavity temperature and strengthen the vortex motion purpose, need not additionally to increase the jet of fuel and air, economizes on resources.
(2) boundary parameter of sudden expansion circulation road of the present utility model (for example circulation area), visual Actual combustion mobility status is regulated, be applicable to the burning of high speed or low speed, and the difference of fuel is injected the burning under form (premix or non-premixed combustion form).
(3) the utility model owing to structurally having widened circulating area, makes the blocking volume of rear bluff body diminish, thereby effectively reduces the overall weight of combustion chamber.
(4) structure of the present utility model is more simple than the structure of cavity spray orifice, is easy to processing.
Description of drawings
Fig. 1 is that the utility model is arranged on in-engine structural representation;
Fig. 2 is that hypotenuse is the front view of the upper rear bluff body of right angle hypotenuse;
Fig. 3 is the left view of Fig. 2;
Fig. 4 is the top view of Fig. 2;
Fig. 5 is that hypotenuse is the front view of the upper rear bluff body of circular arc;
Fig. 6 is integral position graph of a relation of the present utility model;
Fig. 7 is operation principle schematic diagram of the present utility model.
The specific embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is described in further detail.
a kind of expansion type bluff body flameholder, formed by the front bluff body 1 and the rear bluff body 2 that are in combustion chamber 8 and be fixed on motor body 9 sidewalls, front bluff body 1 is shaped as square, form cavity 5 between front bluff body 1 and rear bluff body 2, rear bluff body 2 is identical and be symmetrical upper rear bluff body 3 and the lower rear bluff body 4 of placing in up and down and form by two shapes, after upper, the shape of bluff body 3 and lower rear bluff body 4 is corner cut side's body, after upper, bluff body 3 is the plane with the relative face of lower rear bluff body 4 front ends, form sudden expansion circulation road 6 between upper rear bluff body 3 and lower rear bluff body 4, the front end of sudden expansion circulation road 6 is communicated with cavity 5, the recirculating zone 7 of bluff body 2 back after the rear end of sudden expansion circulation road 6 is communicated with, the rear end of sudden expansion circulation road 6 is shaped as the horn-like of backward opening.
After upper, the length of the minor face 11 of bluff body 3 is 0.1-0.9 of opposite side 15 length, and the length of minor face 12 is 0.1-0.9 of opposite side 14 length, and the length of 4 liang of minor faces of lower rear bluff body is to 0.1-0.9 of edge lengths.
The height 20 of rear bluff body 2 is less than the height 21 of front bluff body 1, and the length 18 of cavity 5 is no more than the height 21 of front bluff body 1.
The center of the center of sudden expansion circulation road 6 and front bluff body 1 height is on same level.
In Fig. 2, two minor faces 11,12 and angle 10 between have relation closely, suppose that minor face 12 length keep certain, angle 10 will increase with the increase of minor face 11 length, thereby regulates the length (being minor face 11) of sudden expansion circulation road 6 circulation leptoprosopy; Suppose that minor face 11 length keep certain, angle 10 reduces with the increase of minor face 12 length, thereby regulates sudden expansion circulation road 6 bell-mouthed areas, and the adjustable extent of minor face 12 length and minor face 11 length is that it is to 0.1-0.9 of edge lengths.
In Fig. 3, the width 16 of rear bluff body 2 is consistent with the width of front bluff body 1, and be the width of combustion chamber 8, the height of upper rear bluff body 3 (being the length on limit 14) is used for regulating the height of rear bluff body 2 part symmetrical structures, thereby increases or reduce the height 19 of sudden expansion circulation road 6.
In Fig. 6, the height 21 of front bluff body 1 and length 17 can be adjusted with the actual flow situation in combustion chamber 8.The height 20 of rear bluff body 2 and the length 18 of cavity 5 all and exist between the height 21 of front bluff body and be closely connected, the height 20 of rear bluff body 2 is less than the height 21 of front bluff body 1, the length 18 of cavity 5 is no more than the height 21 of front bluff body 1.The center of the center of the height 19 of sudden expansion circulation road 6 and the height 21 of front bluff body 1 is on same level.
Operation principle: in Fig. 7, the primary air 21 of combustion chamber 8 with certain speed through front bluff body 1, cavity 5, upper after bluff body 3 and lower after bluff body 4, at the interior formation backflow of cavity 5 vortex 22, reflux 24 in the rear formation of rear bluff body 2, backflow 24 injects cavity 5 by the sudden expansion circulation passage 6 that is formed by upper rear bluff body 3 and lower rear bluff body 4 with part high temperature fluid 23, and then increase the interior bulk temperature of cavity 5, and it is mobile to strengthen vortex 22.
In specific embodiments, the injection form of fuel can adopt premix or spray regime, and under the premix mode, Fuel Selection methane mixes with air, adopts the liquid fuel spray burning under spray regime.The height 20 of rear bluff body 2 is 0.7 with the ratio of the height 21 of front bluff body 1, the length 18 of cavity 5 is 0.6 with the ratio of the height 21 of front bluff body 1, the length of minor face 11 is 1/2 of opposite side 15 length, and the length of minor face 12 is 1/2 of opposite side 14 length, connects to adopt incline plane type.
Claims (5)
1. expansion type bluff body flameholder, formed by the front bluff body and the rear bluff body that are in the combustion chamber and be fixed on the engine shell body sidewall, the front bluff body side of being shaped as body, form cavity between front bluff body and rear bluff body, it is characterized in that: rear bluff body is identical and be symmetrical upper rear bluff body and the lower rear bluff body of placing in up and down and form by two shapes, after upper, the shape of bluff body and lower rear bluff body is corner cut side's body, after upper, bluff body is the plane with the relative face of lower rear bluff body front end, form the sudden expansion circulation road between upper rear bluff body and lower rear bluff body, the front end of sudden expansion circulation road is communicated with cavity, the recirculating zone of bluff body back after the rear end of sudden expansion circulation road is communicated with, the rear end of sudden expansion circulation road is shaped as the horn-like of backward opening.
2. expansion type bluff body flameholder according to claim 1 is characterized in that: the hypotenuse after upper after bluff body and lower rear bluff body corner cut is straight line or circular arc.
3. expansion type bluff body flameholder according to claim 1 and 2 is characterized in that: after upper, the length of bluff body two minor faces is for to 0.1-0.9 of edge lengths, and the length of lower rear bluff body two minor faces is to 0.1-0.9 of edge lengths.
4. expansion type bluff body flameholder according to claim 3, it is characterized in that: the height of rear bluff body is less than the height of front bluff body, and the length of cavity is no more than the height of front bluff body.
5. expansion type bluff body flameholder according to claim 4, it is characterized in that: the center of the center of sudden expansion circulation road and front bluff body height is on same level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736137 CN202973093U (en) | 2012-12-28 | 2012-12-28 | Sudden expansion type bluff body flame stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736137 CN202973093U (en) | 2012-12-28 | 2012-12-28 | Sudden expansion type bluff body flame stabilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202973093U true CN202973093U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220736137 Expired - Fee Related CN202973093U (en) | 2012-12-28 | 2012-12-28 | Sudden expansion type bluff body flame stabilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202973093U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650677A (en) * | 2016-02-26 | 2016-06-08 | 南京航空航天大学 | Integrally-designed flame stabilizer with novel cooling structure |
| CN105972639A (en) * | 2016-05-18 | 2016-09-28 | 重庆大学 | Double-concave-cavity flame stabilized-combustion device based on air staging and reverse jetting technology |
| CN110195863A (en) * | 2019-04-16 | 2019-09-03 | 华中科技大学 | A kind of small diffusion burner that multiple flow passages efficiently preheat |
| CN111023148A (en) * | 2020-01-14 | 2020-04-17 | 薛芳 | Adjustable spiral multi-stage oil-free coal powder igniter |
-
2012
- 2012-12-28 CN CN 201220736137 patent/CN202973093U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650677A (en) * | 2016-02-26 | 2016-06-08 | 南京航空航天大学 | Integrally-designed flame stabilizer with novel cooling structure |
| CN105650677B (en) * | 2016-02-26 | 2018-04-17 | 南京航空航天大学 | Flameholder with novel cooling structure integrated design |
| CN105972639A (en) * | 2016-05-18 | 2016-09-28 | 重庆大学 | Double-concave-cavity flame stabilized-combustion device based on air staging and reverse jetting technology |
| CN105972639B (en) * | 2016-05-18 | 2018-04-06 | 重庆大学 | Concave-concave chamber flame stabilization burner based on air classification backward jet technology |
| CN110195863A (en) * | 2019-04-16 | 2019-09-03 | 华中科技大学 | A kind of small diffusion burner that multiple flow passages efficiently preheat |
| CN111023148A (en) * | 2020-01-14 | 2020-04-17 | 薛芳 | Adjustable spiral multi-stage oil-free coal powder igniter |
| CN111023148B (en) * | 2020-01-14 | 2024-06-07 | 薛芳 | Adjustable screw type multi-stage oil-free coal powder igniter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20131228 |