CN103454278B - Based on the microparticle swarm fuel micro-combustion system of digital hologram light tweezer - Google Patents
Based on the microparticle swarm fuel micro-combustion system of digital hologram light tweezer Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 93
- 239000011859 microparticle Substances 0.000 title claims abstract description 65
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 150000001298 alcohols Chemical class 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 230000011514 reflex Effects 0.000 claims description 2
- 238000001093 holography Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012576 optical tweezer Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 208000032544 Cicatrix Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000001934 delay Effects 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000001535 kindling effect Effects 0.000 description 1
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Abstract
The present invention relates to a kind of microparticle swarm fuel micro-combustion system based on digital hologram light tweezer.The present invention includes the first laser driver, first laser instrument, first spectroscope, second laser, attenuator, second reflective mirror, collimation lens set, first reflective mirror, spatial light modulator, beam expanding lens group, second spectroscope, object lens, microparticle group fuel, micro-combustion chip, 3rd spectroscope, 3rd reflective mirror, CCD camera, thermal camera, first image pick-up card, second image pick-up card, data collecting card, computing machine, nitrogen storage gas cylinder, oxygen gas bomb, first-class gauge, second gauge, surge tank, first valve, second valve, gas chromatograph-mass spectrometer.The present invention effectively manipulates the distributional pattern of fuel by Digital Holography and spatial light modulator, and realizing microparticle group fuel can burn in micro-combustion chip, and effectively can improve the building form of micro-combustion, improves the burning efficiency of micro-combustion.
Description
Technical field
The invention belongs to micro-combustion technical field, relate to a kind of microparticle swarm fuel micro-combustion system based on digital hologram light tweezer.
Background technology
Micro-combustion is identical with traditional combustion function, is heat energy and kinetic energy exactly, has reliable sparking mode, wider operating range and the less pressure loss simultaneously by the chemical energy Efficient Conversion of fuel.But the micro-scale gas flow that is reduced to of yardstick brings a lot of challenge: (1) fuel mix difficulty: because the Reynolds number of microscale little fuel mixture flowing is very little, flowing is in laminar condition.Therefore mixing can not rely on strong turbulent closure scheme, but relies on molecular diffusion.(2) the less fuel hold-up time: along with the reduction of yardstick, the hold-up time of fuel in firing chamber reduces greatly, usually 0.5ms is about, reach the characteristic reactive time of fuel, therefore the accurate number Da of Deng Keer is close to being even less than 1, therefore a lot of fuel has little time reaction and is just excluded outdoor, and burning efficiency reduces.(3) larger combustion heat loss: along with the reduction of yardstick, the surface-to-volume of firing chamber increases than greatly, and corresponding surface radiating amount also increases greatly, thus affects burning efficiency.Heat radiation is serious simultaneously, and chamber temperature can be caused to reduce, and reduces reaction velocity, increases the reaction time, and burning operating range is narrowed, and Deng Keer number is less, and burning efficiency reduces.The instability of burning strengthens: along with the reduction of yardstick, combustion instability, even occurs flame-out phenomenon.Main because: surface-to-volume is than increasing, and thermal loss increases, and temperature of reaction reduces, and retarded combustion reaction rate reaction operating range reduces, and reaction delays even to stop; Combustion chamber volume reduces, thus reduces the residence time of fuel, strengthens gas flow rate, can cause not reacting and occurring putting out in the short time.Course of reaction produces many intermediate products, and wherein the activated free radical of tool will affect the continuity of reaction.Under large scale, the consumption of free radical wall can be ignored, but under microscale, molecular diffusion is very short to the distance of wall, and the collision frequency of unit interval and wall increases, and therefore the consumption of free radical wall is very large, strengthens W-response impact.
Therefore, the present invention proposes to adopt the microparticle fuel micro-combustion control system based on digital hologram light tweezer, the hold-up time of fuel in micro-combustion chip can be increased, improve the mixability of fuel, realize microparticle fuel to burn in micro-combustion chip, and can effectively manipulate, improve efficiency and the fuel energy utilization factor of burning.
Summary of the invention
The present invention uses micro-combustion in liquid or solid microparticle fuel micro-combustion system effectively to control and system integration problem to solve, and proposes a kind of microparticle swarm fuel micro-combustion system based on digital hologram light tweezer.
The technical scheme that the present invention takes is:
Microparticle swarm fuel micro-combustion system based on digital hologram light tweezer comprises the first laser driver, first laser instrument, first spectroscope, second laser, attenuator, second reflective mirror, collimation lens set, first reflective mirror, spatial light modulator, beam expanding lens group, second spectroscope, object lens, microparticle group fuel, micro-combustion chip, 3rd spectroscope, 3rd reflective mirror, CCD camera, thermal camera, first image pick-up card, second image pick-up card, data collecting card, computing machine, nitrogen storage gas cylinder, oxygen gas bomb, first-class gauge, second gauge, surge tank, first valve, second valve, gas chromatograph-mass spectrometer, 3rd valve, vacuum pump, illuminator, objective table, piezoelectric ceramics and tensimeter.
The light that first laser instrument sends incides in collimation lens set through the first spectroscope and collimates light path; Then incide in spatial light modulator through the first reflective mirror, the light of spatial light modulator reflection expands through beam expanding lens group, expands light beam and focuses on microparticle group fuel through the second dichroic mirror to object lens, and microparticle group fuel is captured and be uniformly distributed; First laser instrument is driven by the first laser driver and controls; Microparticle group fuel is placed in micro-combustion chip.
The light that second laser sends arrives on microparticle group fuel through attenuator, the second reflective mirror, collimation lens set, the first reflective mirror, spatial light modulator, beam expanding lens group, the second spectroscope, object lens, for carrying out auxiliary adjustment to light path, guarantee that microparticle group fuel can accurately be caught.
The light that illuminator sends arrives the 3rd spectroscope through microparticle group fuel, objective table, micro-combustion chip, object lens, the second spectroscope, after the 3rd spectroscope light splitting, light beam enters in CCD camera, carries out imaging and observe fuel distribution situation to microparticle group fuel; Another light beam enters in thermal camera through the 3rd reflective mirror, carries out Temperature Distribution test to microparticle group fuel.
CCD camera is connected with computing machine through the first image pick-up card; Thermal camera is connected with computing machine through the second image pick-up card; According to position distribution and the combustion case of microparticle group fuel, computing machine carries out FEEDBACK CONTROL by data collecting card to the first laser driver and spatial light modulator.
Nitrogen enters surge tank from nitrogen storage gas cylinder through first-class gauge, and oxygen enters surge tank from oxygen gas bomb through second gauge, and nitrogen and oxygen are mixed into combination gas according to the ratio of 79:21 in surge tank.
Combination gas, before not entering micro-combustion chip, first utilizes vacuum pump to vacuumize micro-combustion chip through the 3rd valve; After meeting vacuum level requirements, combination gas enters in micro-combustion chip through the first valve, and tensimeter detects the pressure in micro-combustion chip; Microparticle group fuel is evenly caught in combination gas atmosphere, by the output power regulating the drive current of the first laser driver to improve the first laser instrument, is lighted to microparticle group fuel.
The volatile matter of separating out after burning occurs microparticle group fuel and combustion tail gas enter in gas chromatograph-mass spectrometer through the second valve and carry out constituent analysis.
Described microparticle fuel is liquid, solid, biological particles or fuel blend; Liquid selects oil or alcohols, and solid selects coal or metal, and biological particles selects straw or stalk.
Described objective table, can not be deposited on objective table to make fuel with the frequency oscillation of setting by piezoelectric ceramics.
The present invention effectively manipulates the distributional pattern of fuel by Digital Holography and spatial light modulator, realize microparticle group fuel to burn in micro-combustion chip, and effectively can improve the building form of micro-combustion, improve the burning efficiency of micro-combustion, for miniature Aero-Space and minitype portable equipment provide power and propulsion system.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention;
Fig. 2 is digital hologram Optical Tweezers Array schematic diagram of the present invention;
Fig. 3 is digital hologram Optical Tweezers Array auxiliary adjustment light path schematic diagram of the present invention;
Fig. 4 is microparticle group fuel of the present invention imaging, detection and FEEDBACK CONTROL schematic diagram;
Fig. 5 is micro-combustion chip system structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Classical holographic technique utilizes the principle of interference of light, is recorded by the light wave wavefront of object emission, reach the object of scars phase of light wave information with the form of interference fringe; Utilize the wavefront of the diffraction principle reproducing recorded Object light wave of light, just can obtain amplitude (intensity) and position phase (comprising position, shape and the color) information of object, in optical detection and three-dimensional imaging field, there is unique advantage.
Digital hologram refers to and replaces common photographic plate to carry out recorded hologram with CCD image device, reproduces with numerical calculation method; Afterwards, the expanded range of digital hologram was to computergenerated hologram, and photoelectron reconstructing hologram etc., define more broadly digital hologram.Digital holography can be divided into computer generated holograms and pixel holographic two kinds from recording process: divide and can be divided into computer vision reappear theory and photoelectron to reproduce from reproducing processes.
As shown in Figure 1: the present embodiment comprises the first laser driver 1, first laser instrument 2, first spectroscope 3, second laser 4, attenuator 5, second reflective mirror 6, collimation lens set 7, 8, first reflective mirror 9, spatial light modulator 10, beam expanding lens group 11, 12, second spectroscope 13, object lens 14, microparticle group fuel 15, micro-combustion chip 16, 3rd spectroscope 17, 3rd reflective mirror 18, CCD camera 19, thermal camera 20, first image pick-up card 21, second image pick-up card 22, data collecting card 23, computing machine 24, nitrogen storage gas cylinder 25, oxygen gas bomb 26, first-class gauge 27, second gauge 28, surge tank 29, first valve 30, second valve 31, gas chromatograph-mass spectrometer 32, 3rd valve 33, vacuum pump 34, illuminator 35, objective table 36, piezoelectric ceramics 37, tensimeter 38.
The light that first laser instrument 2 sends incides in collimation lens set 7,8 through the first spectroscope 3 and collimates light path.Then incide in spatial light modulator 10 through the first reflective mirror 9, the light that spatial light modulator 10 reflects expands through beam expanding lens group 11,12, expand light beam to reflex to object lens 14 through the second spectroscope 13 and focus on microparticle group fuel 15, microparticle group fuel 15 is captured and be uniformly distributed.
Spatial light modulator 10 is that information can load on the optical data field of one dimension or bidimensional by a class, effectively to utilize the device of the proper velocity of light, concurrency and interconnection capability.This kind of device under the control of time dependent electric drive signal or other signals, can change spatially photodistributed amplitude or intensity, phase place, polarization state and wavelength, or incoherent light is changed into coherent light.The present invention is the Digital Holography utilizing spatial light modulator, realizes the space distribution to a certain form of microparticle group fuel by the phase output controlling spatial light modulator.
In the specific embodiment of the present invention, spatial modulator 10 adopts to column liquid crystal light valve spatial light modulator, comprise many by computer-controlled pixel cell, by applying electric field, the orientation of liquid crystal in pixel can be adjusted in real time, thus produce corresponding phase shift, on optical acquisition face, finally produce the pattern that can control light distribution in real time, wherein each luminous point can catch a particulate, has the ability of catching Particle Swarm.Therefore single beam is by forming the multiple beam with characteristic distribution form after spatial modulator 10, and multiple beam forms Optical Tweezers Array after object lens 14.The digital hologram light tweezer index path adopted in the present invention is shown in Fig. 2.
The present invention adopts the mode of digital recording and optical reproduction to realize digital hologram light tweezer, by Software Create hologram, is then read in spatial light modulator 10, replaces the reproducing medium in traditional optical holography by spatial light modulator 10.First, set and load the distributed intelligence of microparticle group fuel 15, namely reading in the picture of fuel position distribution, noticing that dimension of picture does not exceed 1024 × 1024 pixels.By arranging the parameter of virtual optical path, as diffraction distance, angle between reference etc., generate digital hologram.Then, numeral is utilized to have the multi-beam array light tweezer of space distribution to the realization of hologram reconstruction calculation procedure according to the light path of Figure of description 1.Regulate the angle of the polaroid in spatial modulator 10 and the angle of spatial modulator 10 and light path, obtain optimum reproducing effect.
Microparticle group fuel 15 is placed in micro-combustion chip 16.The microparticle group fuel 15 used in present system can be liquid (oil, alcohols), solid (coal, metal), biological particles (straw, stalk) and fuel blend etc.Due to liquid fuel, solid, biomass fuel and fuel blend, there is larger difference in its fuel characteristic parameter, therefore needs Real-time Feedback fuel space to be distributed to laser driver and spatial light modulator carries out Effective Regulation.
Improve the laser power be radiated on microparticle group fuel 15 gradually, particle surface generating gasification, has Volatile, and when microparticle fuel surface temperature exceedes its kindling point, microparticle fuel, by lighting, combustion reaction is occurred.In Figure of description 2, the first laser instrument 2 is driven by the first laser driver 1 and controls, and therefore in order to realize microparticle ignited fuel, the maximum power output of the first laser instrument 2 should reach several watts.
In the present invention, the wavelength of the first laser instrument 2 is invisible light, and the adjustment therefore for light path needs to adopt auxiliary optical path to carry out, and digital hologram light tweezer auxiliary adjustment light path is shown in Figure of description 3.The light that second laser 4 sends arrives on microparticle group fuel 15 through attenuator 5, second reflective mirror 6, collimation lens set 7,8, first reflective mirror 9, spatial light modulator 10, beam expanding lens group 11,12, second spectroscope 13, object lens 14, for carrying out auxiliary adjustment to light path, guarantee that microparticle group fuel 15 can accurately be caught.Second laser 4 adopts visible ray helium-neon laser usually, wavelength 632.8nm, and power is number milliwatt.
In the present invention microparticle group fuel 15 imaging, locus distribution and Temperature Distribution test pattern see Figure of description 4.The light that illuminator 35 sends arrives the 3rd spectroscope 17 through microparticle group fuel 15, objective table 36, micro-combustion chip 16, object lens 14, second spectroscope 13, after the 3rd spectroscope 17 light splitting, light beam enters in CCD camera 19, carries out imaging and observe fuel distribution situation to microparticle group fuel 15.Another light beam enters in thermal camera 20 through the 3rd reflective mirror 18, carries out Temperature Distribution test to microparticle group fuel 15.In micro-combustion chip, objective table 36 by piezoelectric ceramics 37 with certain frequency oscillation, can not be able to be deposited on objective table to make fuel.
Adopt computing machine to carry out real-time data acquisition and FEEDBACK CONTROL, its structural representation is shown in Figure of description 4 simultaneously.CCD camera 19 is connected with computing machine 24 through the first image pick-up card 21.Thermal camera 20 is connected with computing machine 24 through the second image pick-up card 22.According to position distribution and the combustion case of microparticle group fuel 15, by data collecting card 23, FEEDBACK CONTROL is carried out to the first laser driver 1 and spatial light modulator 10.Realizing the stable of microparticle group fuel 15 by regulating the power stage of the first laser driver 1 to catch, realizing the multi-form distribution of microparticle group fuel 15 by the multiple beam distribution of adjustment and transformation space photomodulator 10.
Micro-combustion chip system structural representation is shown in Figure of description 5, nitrogen enters surge tank 29 from nitrogen storage gas cylinder 25 through first-class gauge 27, oxygen enters surge tank 29 from oxygen gas bomb 26 through second gauge 28, and nitrogen and oxygen are mixed into combination gas according to the ratio of 79:21 in surge tank 29.
Combination gas, before not entering micro-combustion chip 16, first utilizes vacuum pump 34 to vacuumize through the 3rd valve 33 pairs of micro-combustion chips 16.After meeting vacuum level requirements, combination gas enters in micro-combustion chip 16 through the first valve 30, and tensimeter 38 detects the pressure in micro-combustion chip 16.
Microparticle group fuel 15 is evenly caught in combination gas atmosphere, by the output power regulating the drive current of the first laser driver 1 to improve the first laser instrument 2, is lighted to microparticle group fuel 15.
The volatile matter of separating out after burning occurs microparticle group fuel 15 and combustion tail gas enter in gas chromatograph-mass spectrometer 32 through the second valve 31 and carry out constituent analysis.
Claims (1)
1. based on the microparticle swarm fuel micro-combustion system of digital hologram light tweezer, it is characterized in that: comprise the first laser driver (1), first laser instrument (2), first spectroscope (3), second laser (4), attenuator (5), second reflective mirror (6), collimation lens set (7, 8), first reflective mirror (9), spatial light modulator (10), beam expanding lens group (11, 12), second spectroscope (13), object lens (14), microparticle group fuel (15), micro-combustion chip (16), 3rd spectroscope (17), 3rd reflective mirror (18), CCD camera (19), thermal camera (20), first image pick-up card (21), second image pick-up card (22), data collecting card (23), computing machine (24), nitrogen storage gas cylinder (25), oxygen gas bomb (26), first-class gauge (27), second gauge (28), surge tank (29), first valve (30), second valve (31), gas chromatograph-mass spectrometer (32), 3rd valve (33), vacuum pump (34), illuminator (35), objective table (36), piezoelectric ceramics (37) and tensimeter (38),
The light that first laser instrument (2) sends incides in collimation lens set (7,8) through the first spectroscope (3) and collimates light path; Then incide in spatial light modulator (10) through the first reflective mirror (9), the light that spatial light modulator (10) reflects expands through beam expanding lens group (11,12), expand light beam to reflex to object lens (14) through the second spectroscope (13) and focus on microparticle group fuel (15), microparticle group fuel (15) is captured and be uniformly distributed; First laser instrument (2) is driven by the first laser driver (1) and controls; Microparticle group fuel (15) is placed in micro-combustion chip (16);
The light that second laser 4 sends arrives on microparticle group's fuel (15) through attenuator (5), the second reflective mirror (6), collimation lens set (7,8), the first reflective mirror (9), spatial light modulator (10), beam expanding lens group (11,12), the second spectroscope (13), object lens (14), for carrying out auxiliary adjustment to light path, guarantee that microparticle group fuel (15) can accurately be caught;
The light that illuminator (35) sends arrives the 3rd spectroscope (17) through microparticle group fuel (15), objective table (36), micro-combustion chip (16), object lens (14), the second spectroscope (13), after the 3rd spectroscope (17) light splitting, light beam enters in CCD camera (19), carries out imaging and observe fuel distribution situation to microparticle group fuel (15); Another light beam enters in thermal camera (20) through the 3rd reflective mirror (18), carries out Temperature Distribution test to microparticle group fuel (15);
CCD camera (19) is connected with computing machine (24) through the first image pick-up card (21); Thermal camera (20) is connected with computing machine (24) through the second image pick-up card (22); According to position distribution and the combustion case of microparticle group fuel (15), computing machine (24) carries out FEEDBACK CONTROL by data collecting card (23) to the first laser driver (1) and spatial light modulator (10);
Nitrogen enters surge tank (29) from nitrogen storage gas cylinder (25) through first-class gauge (27), oxygen enters surge tank (29) from oxygen gas bomb (26) through second gauge (28), and nitrogen and oxygen are mixed into combination gas according to the ratio of 79:21 in surge tank (29);
Combination gas, before not entering micro-combustion chip (16), first utilizes vacuum pump (34) to vacuumize micro-combustion chip (16) through the 3rd valve (33); After meeting vacuum level requirements, combination gas enters in micro-combustion chip (16) through the first valve (30), and tensimeter (38) detects the pressure in micro-combustion chip (16); (15 are evenly caught microparticle group fuel in combination gas atmosphere, by the output power regulating the drive current of the first laser driver (1) to improve the first laser instrument (2), lighted to microparticle group fuel (15);
The volatile matter of separating out after burning occurs microparticle group fuel (15) and combustion tail gas enter in gas chromatograph-mass spectrometer (32) through the second valve (31) and carry out constituent analysis;
Described microparticle fuel is liquid, solid, biological particles or fuel blend; Liquid selects oil or alcohols, and solid selects coal or metal, and biological particles selects straw or stalk;
Described objective table, can not be deposited on objective table to make fuel with the frequency oscillation of setting by piezoelectric ceramics.
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| CN105181701B (en) * | 2015-09-30 | 2018-09-25 | 南京理工大学 | The detection system and method for a kind of metal to laser energy absorption rule |
| CN106950252B (en) * | 2017-03-15 | 2019-11-08 | 哈尔滨工业大学 | A kind of method that dynamic measures the device of the burning of fine grained sample and sintering characteristic and measures characterisitic parameter using the device |
| CN108663474A (en) * | 2017-03-28 | 2018-10-16 | 南京理工大学 | A kind of solid-state heat source smolderability for cigarette low-temperature heat can assess experimental provision |
| CN109374482A (en) * | 2018-09-28 | 2019-02-22 | 北京理工大学 | A kind of energetic material microparticle quickly heats response characteristics testing device |
| CN112749507B (en) * | 2020-12-29 | 2022-07-12 | 浙江大学 | Method for holographic online measurement of coal and biomass coupling power generation blending ratio |
| CN113238075B (en) * | 2021-04-22 | 2023-02-14 | 哈尔滨工程大学 | Flow velocity meter based on optical fiber tweezers technology |
| CN114383984B (en) * | 2021-12-06 | 2022-09-23 | 浙江大学 | System for capturing particulate matter and measuring phase state, morphology and chemical components of particulate matter |
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