CN103982910A - Method and device for improving blow-off limit of combustible gas through laser ablation of metal target plasma - Google Patents
Method and device for improving blow-off limit of combustible gas through laser ablation of metal target plasma Download PDFInfo
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- CN103982910A CN103982910A CN201410236529.3A CN201410236529A CN103982910A CN 103982910 A CN103982910 A CN 103982910A CN 201410236529 A CN201410236529 A CN 201410236529A CN 103982910 A CN103982910 A CN 103982910A
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Abstract
The invention discloses a method and a device for improving a blow-off limit of the combustible gas through laser ablation of metal target plasma. The method comprises step 1, enabling the combustible gas to be communicated into a combustor nozzle and adjusting the gas flow speed to be located in a supercritical state and step 2, placing a metal target above the nozzle, enabling the metal target and the nozzle to be tangent, enabling the laser light output from a laser to be incident to a lens and focused on the surface of the metal target through the lens to ablate the metal target so as to generate the plasma, performing camera shooting on a flame formed by the combustible gas and measuring the blow-off limit of the combustible gas. The device comprises an oxidant gas source, a fuel gas source, a mass flow meter, a gas distribution system, the nozzle, the metal target, the laser, the lens and a camera. The method and the device for improving the blow-off limit of the combustible gas through the laser ablation of the metal target plasma are based on the characteristic that the laser ablation of the metal target plasma is low in breakdown threshold value and accordingly the metal target ablation is performed to form the plasma in the mixed gas so as to form a stable local heat source and active particle source. The method and the device are used for improving the blow-off limit of the combustible gas in a gas flow velocity supercritical combustion system.
Description
Technical field
The present invention relates to a kind of method and device that improves fuel gas blow-off limit.
Background technology
Along with the development of supersonic and hypersonic aircraft, the overcritical combustion system of various air velocities becomes study hotspot.The speed of supercritical flow is much larger than flame propagation velocity, and flame is very easily blown out, and has had a strong impact on job stability and the flight safety of combustion system.In order to prevent fray-out of flame, must solve air velocity and the unmatched problem of flame propagation velocity, smooth combustion apparatus need to be set in combustion system.Steady combustion can be by reducing air velocity and improving two kinds of modes of flame propagation velocity and realize, but reduce air velocity and will cause that fuel availability is low, the problems such as combustion chamber heat management, therefore adopt the smooth burning method raising flame propagation velocity of non-intervention type to become current study hotspot.Plasma Assisted Combustion technology is a kind of so steady combustion means of non-intervention type just, it is ionized fuel and oxidant, dissociate, excite by the effect of plasma, become bioactive molecule, atom, free radical etc., thereby promote the combustion chemistry reaction process of air mixture, improve flame propagation velocity and the blow-off limit of fuel gas.
Summary of the invention
In order to solve the combustion instability existing in the overcritical combustion system of existing air velocity, the problem that flame is easily put out, simultaneously by laser ablation metallic target solve that required pulsed laser energy is high, power consumption is large, be unfavorable for the problem of engineering application, the invention provides method and device thereof that a kind of laser ablation metallic target plasma improves fuel gas blow-off limit.
The object of the invention is to be achieved through the following technical solutions:
Laser ablation metallic target plasma improves a method for fuel gas blow-off limit, and it is realized by following steps:
Step 1, fuel gas is passed into burner nozzle, regulate air velocity to make it in supercriticality;
Step 2, metallic target are placed on nozzle top tangent with nozzle, the laser of laser instrument output incides lens, through lens focus, to metallic target ablated surface metallic target, produce plasma, the flame that fuel gas forms is taken through camera, measures the blow-off limit of fuel gas.
Realize the device that laser ablation metallic target plasma described in said method improves fuel gas blow-off limit, comprise oxidant source of the gas, fuel gas source, oxidant source of the gas mass flowmenter, fuel gas source mass flowmenter, air distribution system, nozzle, metallic target, camera and the laser instrument setting gradually along optical axis direction and lens, the gas outlet of described fuel gas source is connected with the air intake of fuel gas source mass flowmenter, the gas outlet of oxidant source of the gas is connected with the air intake of oxidant source of the gas mass flowmenter, oxidant source of the gas mass flowmenter is connected with the gas outlet of fuel gas source mass flowmenter and the air intake of air distribution system, the gas outlet of air distribution system is connected with the air intake of nozzle, metallic target is placed on nozzle top tangent with nozzle, nozzle is positioned at the place ahead of lens, the focus of lens is positioned at the surface of metallic target, camera is positioned at a side of nozzle and perpendicular to laser optical path, places the flame forming for taking fuel gas.The laser of laser instrument output incides lens, surperficial to metallic target through lens focus.The flame that fuel gas forms is taken through camera, measures the blow-off limit of fuel gas.
The present invention is based on the low feature of laser ablation metallic target plasma breakdown threshold, by ablate metals target, in air mixture, produce plasma, form stable local heat source and active particle source.In plasma, contain a large amount of bioactive molecules, atom and free radical, these active groups have accelerated the carrying out of burning chain reaction, have improved flame transmission speed and the blow-off limit of fuel gas.The present invention is applicable to improve the blow-off limit of fuel gas in the overcritical combustion system of air velocity.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited to this; every technical solution of the present invention is modified or is equal to replacement, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
The specific embodiment one: as shown in Figure 1, the laser ablation metallic target plasma that present embodiment provides improves the device of fuel gas blow-off limit, comprises oxidant source of the gas 1, fuel gas source 2, oxidant source of the gas mass flowmenter 3, fuel gas source mass flowmenter 4, air distribution system 5, nozzle 6, metallic target 7, camera 10 and the laser instrument 9 setting gradually along optical axis direction and lens 8, the gas outlet of described fuel gas source 2 is connected with the air intake of fuel gas source mass flowmenter 4, the gas outlet of oxidant source of the gas 1 is connected with the air intake of oxidant source of the gas mass flowmenter 3, the gas outlet of oxidant source of the gas mass flowmenter 3 and fuel gas source mass flowmenter 4 is connected with the air intake of air distribution system 5, the gas outlet of air distribution system 5 is connected with the air intake of nozzle 6, metallic target 7 is placed on nozzle 6 tops tangent with nozzle 6, nozzle 6 is positioned at the place ahead of lens 8, the focus of lens 8 is positioned at the surface of metallic target 7, camera 10 is positioned at a side of nozzle 6 and perpendicular to laser optical path, places the flame forming for taking fuel gas.The flow of fuel and oxidant is controlled by mass flowmenter, by quality of regulation flowmeter, makes the air velocity of fuel gas in supercriticality.
During use, fuel gas is passed into nozzle, regulate air velocity to make it in supercriticality; The laser of laser instrument output incides lens, through lens focus, to metallic target ablated surface metallic target, produces plasma, and the flame that fuel gas forms is taken through camera, measures the blow-off limit of fuel gas.
The specific embodiment two: present embodiment is different from the specific embodiment one, described fuel is a kind of in methane, propane, hydrogen, natural gas; Oxidant is nitrogen/oxygen mixture, and the volume fraction of oxygen is 5-100%.
The specific embodiment three: what present embodiment was different from the specific embodiment one, two is, described laser instrument is a kind of of pulse solid laser, pulsed excimer laser, optical maser wavelength is a kind of of 1064 nm and high-order frequency multiplication, 694.3nm and high-order frequency multiplication thereof, 308 nm, 248 nm, laser repetition is 10-1000 Hz, and pulsed laser energy is 2-2000 mJ.
The specific embodiment four: present embodiment is different from the specific embodiment one to three, and the described focal length of lens is 5-2000 mm.
The specific embodiment five: present embodiment is different from the specific embodiment one to four, within the scope of 5 times of nozzle diameters of positional distance jet expansion end face of described focus point.
The specific embodiment six: present embodiment is different from the specific embodiment one to five, and the material of described metallic target is a kind of of the materials such as tantalum, tungsten, rhenium, titanium, stainless steel, aluminium alloy.
Claims (10)
1. laser ablation metallic target plasma improves a device for fuel gas blow-off limit, it is characterized in that described device comprises oxidant source of the gas, fuel gas source, oxidant source of the gas mass flowmenter, fuel gas source mass flowmenter, air distribution system, nozzle, metallic target, camera and the laser instrument setting gradually along optical axis direction and lens, the gas outlet of described fuel gas source is connected with the air intake of fuel gas source mass flowmenter, the gas outlet of oxidant source of the gas is connected with the air intake of oxidant source of the gas mass flowmenter, oxidant source of the gas mass flowmenter is connected with the gas outlet of fuel gas source mass flowmenter and the air intake of air distribution system, the gas outlet of air distribution system is connected with the air intake of nozzle, metallic target is placed on nozzle top tangent with nozzle, nozzle is positioned at the place ahead of lens, the focus of lens is positioned at the surface of metallic target, camera is positioned at a side of nozzle and perpendicular to laser optical path, places the flame forming for taking fuel gas.
2. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, it is characterized in that described fuel is a kind of in methane, propane, hydrogen, natural gas.
3. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, it is characterized in that described oxidant is nitrogen/oxygen mixture, and the volume fraction of oxygen is 5-100%.
4. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, it is characterized in that described laser instrument is a kind of of pulse solid laser, pulsed excimer laser.
5. laser ablation metallic target plasma according to claim 4 improves the device of fuel gas blow-off limit, it is characterized in that described optical maser wavelength is a kind of of 1064 nm and high-order frequency multiplication, 694.3 nm and high-order frequency multiplication thereof, 308 nm, 248 nm.
6. laser ablation metallic target plasma according to claim 4 improves the device of fuel gas blow-off limit, it is characterized in that described laser repetition is 10-1000 Hz, and pulsed laser energy is 5-2000 mJ.
7. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, it is characterized in that the described focal length of lens is 5-2000 mm.
8. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, it is characterized in that within the scope of 5 times of nozzle diameters of positional distance jet expansion end face of described focus point.
9. laser ablation metallic target plasma according to claim 1 improves the device of fuel gas blow-off limit, and the material that it is characterized in that described metallic target is a kind of in tantalum, tungsten, rhenium, titanium, stainless steel, aluminium alloy.
10. the device that utilizes laser ablation metallic target plasma described in the arbitrary claim of claim 1-9 to improve fuel gas blow-off limit improves a method for fuel gas blow-off limit, it is characterized in that described method is realized by following steps:
Step 1, fuel gas is passed into burner nozzle, regulate air velocity to make it in supercriticality;
Step 2, metallic target are placed on nozzle top tangent with nozzle, the laser of laser instrument output incides lens, through lens focus, to metallic target ablated surface metallic target, produce plasma, the flame that fuel gas forms is taken through camera, measures the blow-off limit of fuel gas.
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| CN201410236529.3A CN103982910B (en) | 2014-05-30 | 2014-05-30 | Laser ablation metallic target plasma improves the method and device of fuel gas blow-off limit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120146A (en) * | 2019-12-10 | 2020-05-08 | 南京理工大学 | Energy-containing liquid laser enhanced propelling device based on microfluidic technology |
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| CN102287349A (en) * | 2011-06-03 | 2011-12-21 | 哈尔滨工业大学 | Method for raising stable combustion limit of gas hydrocarbon fuels by femtosecond laser induced plasmas and device realizing same |
| CN103343735A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Method for nanosecond laser to induce plasma to improve stable combustion limit of gas hydrocarbon fuel and device for achieving method |
| CN103343982A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Method for enabling laser to induce metal target plasma to achieve ignition of flammable gas and device for achieving same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287349A (en) * | 2011-06-03 | 2011-12-21 | 哈尔滨工业大学 | Method for raising stable combustion limit of gas hydrocarbon fuels by femtosecond laser induced plasmas and device realizing same |
| CN103343735A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Method for nanosecond laser to induce plasma to improve stable combustion limit of gas hydrocarbon fuel and device for achieving method |
| CN103343982A (en) * | 2013-07-22 | 2013-10-09 | 哈尔滨工业大学 | Method for enabling laser to induce metal target plasma to achieve ignition of flammable gas and device for achieving same |
Non-Patent Citations (3)
| Title |
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| XIAOHUI LI,ET AL.: "Laser ablation ignition of premixed methane and oxygenen-riched air mixtures using a tantalum target", 《OPTICS LETTERS》 * |
| XIAOHUI LI,ET AL.: "Laser induced spark ignition of coaxial methane/oxygen/nitrogen diffusion flames", 《OPTICS EXPRESS》 * |
| 于杨: "CH_4/O_2/N_2激光诱导等离子体点火技术实验研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120146A (en) * | 2019-12-10 | 2020-05-08 | 南京理工大学 | Energy-containing liquid laser enhanced propelling device based on microfluidic technology |
| CN111120146B (en) * | 2019-12-10 | 2022-05-13 | 南京理工大学 | Energy-containing liquid laser enhanced propelling device based on microfluidic technology |
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| CN103982910B (en) | 2016-11-09 |
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