CN102135272A - Micro diffusion combustor - Google Patents
Micro diffusion combustor Download PDFInfo
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- CN102135272A CN102135272A CN 201110057171 CN201110057171A CN102135272A CN 102135272 A CN102135272 A CN 102135272A CN 201110057171 CN201110057171 CN 201110057171 CN 201110057171 A CN201110057171 A CN 201110057171A CN 102135272 A CN102135272 A CN 102135272A
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Abstract
The invention discloses a micro diffusion combustor. In the micro diffusion combustor, a fuel passage, an air passage and a combustion chamber are formed on a substrate; the outlet ends of the fuel passage and the air passage are communicated with an inlet of the combustion chamber; the fuel passage, the air passage and the combustion chamber are distributed in an Y shape; and a porous medium is arranged at the inlet of the combustion chamber. Fuel and air enter the combustion chamber from the two air inlet runners which have the Y shape, and are fully mixed and combusted on the part filled with the porous medium in the combustion chamber after being mixed primarily, and the combustion products are discharged through the outlet of the combustion chamber. The fuel and the air are primarily mixed by using the Y-shaped design of the air inlet runners, and the fuel and the air are fully mixed further by using the porous medium. The porous medium has the function of preheating and catalysis. The micro diffusion combustor can realize the full mixing of the fuel and air, is easy to ignite, and is high in combustion efficiency, and can be widely applied to various micro motor systems.
Description
Technical field
The invention belongs to the technical field of two-phase gas diffusion combustion, refer in particular to the burner that thermal source or high temperature source of the gas are provided for the microminiature power set.
Background technology
Along with the progress of human society, people are increasing to the demand of the microminiature portable set of various civil and militaries.The fast development of micro-processing technology makes the possibility that creates of these microelectromechanical systems and equipment, has occurred portable electric appts such as micro-satellite, microrobot and mobile phone in succession.At present, these equipment are mostly driven by traditional chemical cell, yet there are shortcomings such as energy density is little, volume and weight is big, the charging interval is long in battery, and the energy density of HC fuel exceeds 50-100 doubly than battery.Therefore, the microminiature dynamical system based on burning is expected to replace in future present widely used chemical cell.Researchers have successfully produced little combustion gas turbine, little rotary engine, little propulsion system, low-grade fever photovoltaic generating system and low-grade fever electric system, or the like.Wherein, burner is the critical component of microminiature dynamical system.
Based on fuel and the air admixture before entering the combustion chamber, burning can be divided into premixed combustion and diffusion combustion.Because the mini combustion device is to be applied to various portable sets provide in the microminiature dynamical system of power, therefore, security is the major issue that should at first consider.In order to prevent that the combustion chamber from the danger of tempering taking place, and can take the diffusion combustion mode of fuel and the non-premix of air.But can bring a problem thus, that is exactly how fuel and air fully mix in the very short time, otherwise can cause flame instability, reaction is insufficient, efficiency of combustion is low.For example, people such as people such as Ju and Miesse have found so-called " flame street " in that the mini combustion of diffusion combustion is indoor, the phenomenon that to be a plurality of flammules along entry of combustion chamber to outlet disperse distributes, they think that this causes owing to fuel and air undercompounding.Except mixed problem,, equally also need the common problem of considering that all mini combustion devices are faced, promptly because the too big problem that causes the flame holding variation of wall heat loss for the mini combustion device that adopts diffusion combustion.
At the mixed problem between fuel and the air in the mini combustion device, researchers have proposed active respectively and reinforcement hybrid plan passive type.Wherein, active reinforcement hybrid plan need be provided with extra actuator, and the system that makes becomes complicated and seldom obtains adopting.Passive type is strengthened hybrid plan and only need be relied on structural optimal design to solve this problem, thereby uses wider.For example, the research group of Univ Maryland-Coll Park USA has designed a kind of structure: wherein air flow channel is horizontally disposed, and fuel flow channel is vertical with it.When air when horizontal direction enters the combustion chamber with fast speeds, can produce a stronger ejector action to fuel, strengthen two kinds of mixing between the gas with various with this.Yet, utilize ejector action to mix and can bring two problems: the one, there is bigger speed difference between requirement two fluid streams, otherwise the mixed effect that is difficult to obtain; The 2nd, under the injection mode, be difficult to quantitatively control air-fuel ratio.
On the one hand, in order to improve the flame holding in the mini combustion device, most researchers all adopts the method for thermal cycle in addition.Adopt so-called " swiss roll (Swiss-Roll) " structure as people such as Ronney, Maruta and clock Beijing.Yet this burner structure is too complicated, causes processing difficulties and high cost of manufacture.In addition, the research group of Singapore has then developed sudden expansion type mini combustion device with the level and has come the retention flame, but the existence of step has reduced the compactedness of burner.
Summary of the invention
The objective of the invention is for a kind of good mixing effect being provided, surely firing the high microminiature diffusion burner of wide ranges and efficiency of combustion.
Microminiature diffusion burner provided by the invention, it is characterized in that, on resistant to elevated temperatures matrix, be processed with fuel channel, air duct and combustion chamber, the port of export of fuel channel and air duct is communicated with the inlet of combustion chamber, fuel channel, air duct and combustion chamber are the Y type to be arranged, is placed with porous media in the porch of combustion chamber.
The invention has the advantages that: fuel channel and air duct are distributed in the both sides of combustion chamber symmetrically, and the three is y-type structure.In addition, at the entry of combustion chamber end high porosity, resistant to elevated temperatures porous media are installed.This structure has following advantage: the speed of (1) fuel and air can be distinguished and controlled, and guarantees to obtain the mixture of the air-fuel ratio wanted.(2) angle between fuel channel and the air duct can be optimized design, guarantees that two kinds of fluids tentatively mix by the collision of appropriateness.(3) porous media can play multiple action.The pulsation that it produces in the time of can suppressing the collision of two fluid streams guarantees that fuel and air further fully mix at this, can play the effect to the gas preheating simultaneously again.In addition, itself can also be the porous type catalyst.This shows, the present invention has overcome the deficiencies in the prior art, can realize the abundant mixing between fuel and the air, can utilize the heat effect of porous media to come preheating gas again, and the catalytic type porous media reduces igniting institute energy requirement, shortens ignition delay time, improves efficiency of combustion.Therefore, the present invention can effectively improve flame holding and the efficiency of combustion in the microminiature diffusion burner, is widely used in various micro power systems.
Description of drawings
Fig. 1 is a structural representation of the present invention:
Wherein 1. fuel channels, 2. air duct, 3. combustion chamber, 4. porous media
Fig. 2 is 200 times and 3000 times a sem photograph of the porous media (sintering metal nickel) of the embodiment of the invention.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail, but following examples only are illustrative, protection scope of the present invention is not subjected to the restriction of these embodiment.
As shown in Figure 1: basic structure of the present invention is: be processed with fuel channel 1 on resistant to elevated temperatures matrix, air duct 2 and combustion chamber 3.The port of export of fuel channel 1 and air duct 2 is communicated with the inlet of combustion chamber 3.Fuel channel 1, air duct 2 and combustion chamber 3 are the Y type to be arranged, helps two kinds of gases like this and tentatively mixes.3 porch is placed with porous media 4 in the combustion chamber, porous media itself can be catalyst (as by sintrered nickel (Ni) inclusion of fento type at platinum/aluminium oxide (Pt/Al
2O
3) the formed composite catalyst in fine particle outside), can not catalyst also.Porous media can play the effect to the gas preheating.
Fuel and air enter micro combustor from separately air inlet respectively, tentatively mix at inlet, further abundant mixing and convection cell pulsation suppress in porous media then, ignition immediately, high-temperature flue gas is discharged by combustor exit, can be used for providing thermal source, also can be used as the high-temperature fuel gas of miniature propulsion system, produce thrust by follow-up jet pipe for minisize thermoelectric device or hot photovoltaic system.
In order further to improve the mixed effect between fuel and the air, the angle between fuel channel and the air duct is preferably 30～60 °.
Example:
The employing methane gas is a fuel.The width of two inlet channels is 2mm, highly is 2mm, and angle is 45 degree, and the combustion chamber width is 4mm, and length is 30mm, highly is 2mm.Matrix material adopts resistant to elevated temperatures silicon carbide ceramics, and its density, thermal conductivity factor and normal emittance are respectively 3100kg/m
3, 92W/ (m
2K) and 0.77.Porous media adopts nickel powder to form at 700 ℃ of following sintering, and its sem photograph that amplifies 200 times and 3000 times as shown in Figure 2.Use general CFD software for calculation Fluent, the mixing and burning under the different air-fuel ratio operating modes has been carried out numerical simulation, the result shows that the present invention is effective for fuel and Air mixing, and range of flame is wide, the efficiency of combustion height.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of finishing under the spirit disclosed in this invention or revise, all fall into the scope of protection of the invention.
Claims (3)
1. microminiature diffusion burner, it is characterized in that, on matrix, be processed with fuel channel (1), air duct (2) and combustion chamber (3), the port of export of fuel channel (1) and air duct (2) is communicated with the inlet of combustion chamber (3), fuel channel (1), air duct (2) and combustion chamber (3) are the Y type and arrange that the porch of (3) is placed with porous media (4) in the combustion chamber.
2. mini combustion device according to claim 1 is characterized in that, the angle between fuel channel (1) and the air duct (2) is 30～60 °.
?
3. mini combustion device according to claim 1 is characterized in that, porous media is a catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110057171 CN102135272A (en) | 2011-03-09 | 2011-03-09 | Micro diffusion combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110057171 CN102135272A (en) | 2011-03-09 | 2011-03-09 | Micro diffusion combustor |
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| CN102135272A true CN102135272A (en) | 2011-07-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507191A (en) * | 2011-10-25 | 2012-06-20 | 南京航空航天大学 | Micro-space combustion test measuring table based on modular design |
| CN103090384A (en) * | 2013-01-16 | 2013-05-08 | 江苏大学 | Regenerative microscale burner filled with porous media |
| CN103148483A (en) * | 2013-02-27 | 2013-06-12 | 华中科技大学 | Graded mixing tiny type diffusion burner |
| CN104595899A (en) * | 2015-01-27 | 2015-05-06 | 北京工业大学 | Micro-miniature catalytic burner taking foam metal as catalyst structure substrate |
| CN107726321A (en) * | 2017-09-26 | 2018-02-23 | 华中科技大学 | It is a kind of that the micro-burner that flame holding is improved with strengthening backflow is preheated based on gas |
| CN111947146A (en) * | 2020-07-17 | 2020-11-17 | 浙江吉成新材股份有限公司 | Radiation heating method and heating device for premixing combustion of porous material |
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| US6193501B1 (en) * | 1999-07-06 | 2001-02-27 | The Board Of Trustees Of The University Of Illinois | Microcombustor having submillimeter critical dimensions |
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| CN1888533A (en) * | 2006-07-18 | 2007-01-03 | 中国科学院广州能源研究所 | Low-heat loss micro-scale burner |
| CN101354132A (en) * | 2008-05-23 | 2009-01-28 | 江苏大学 | High-efficiency porous media combustor for minitype heat optoelectronic system |
| CN101645677A (en) * | 2009-09-01 | 2010-02-10 | 中国科学院广州能源研究所 | Minisize thermoelectric generator |
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| US6193501B1 (en) * | 1999-07-06 | 2001-02-27 | The Board Of Trustees Of The University Of Illinois | Microcombustor having submillimeter critical dimensions |
| US6786716B1 (en) * | 2002-02-19 | 2004-09-07 | Sandia Corporation | Microcombustor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507191A (en) * | 2011-10-25 | 2012-06-20 | 南京航空航天大学 | Micro-space combustion test measuring table based on modular design |
| CN102507191B (en) * | 2011-10-25 | 2013-11-27 | 南京航空航天大学 | Micro-space combustion test measuring table based on modular design |
| CN103090384A (en) * | 2013-01-16 | 2013-05-08 | 江苏大学 | Regenerative microscale burner filled with porous media |
| CN103090384B (en) * | 2013-01-16 | 2016-04-06 | 江苏大学 | A kind of porous media backheating type micro-scale burner |
| CN103148483A (en) * | 2013-02-27 | 2013-06-12 | 华中科技大学 | Graded mixing tiny type diffusion burner |
| CN104595899A (en) * | 2015-01-27 | 2015-05-06 | 北京工业大学 | Micro-miniature catalytic burner taking foam metal as catalyst structure substrate |
| CN104595899B (en) * | 2015-01-27 | 2017-03-01 | 北京工业大学 | The microminiature catalytic burner of catalyst structure matrix made by a kind of use foam metal |
| CN107726321A (en) * | 2017-09-26 | 2018-02-23 | 华中科技大学 | It is a kind of that the micro-burner that flame holding is improved with strengthening backflow is preheated based on gas |
| CN111947146A (en) * | 2020-07-17 | 2020-11-17 | 浙江吉成新材股份有限公司 | Radiation heating method and heating device for premixing combustion of porous material |
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Application publication date: 20110727 |