CN105067026A - Device and method for studying influence of external wind speed on flame propagation and stability - Google Patents
Device and method for studying influence of external wind speed on flame propagation and stability Download PDFInfo
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- CN105067026A CN105067026A CN201510553241.3A CN201510553241A CN105067026A CN 105067026 A CN105067026 A CN 105067026A CN 201510553241 A CN201510553241 A CN 201510553241A CN 105067026 A CN105067026 A CN 105067026A
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Abstract
The invention provides a device and a method for studying the influence of external wind speed on flame propagation and stability. The device comprises a fan, a wind quantity adjusting panel, a wind speed uniform distribution panel, an experiment tunnel, a wind speed measurement window, a smoke measurement window, a draught fan, a support, a Bunsen burner, a height adjusting stand, a rubber tube, a flow meter, a valve and a gas cylinder. One end of the experiment tunnel is used for wind supply and the other end is used for wind inducing, so that the propagation characteristic and the stability of flames of a fixed fire source can be studied on the condition of uniform external wind speed. The device is low in manufacture cost, simple in structure, convenient to operate and flexible to control; experimental phenomena are easy to observe and measure; obtained data are real and reliable; experimental basis can be provided for studying the flame structure and the burning characteristics under the condition of relative motion and analyzing the propagation characteristic and the stability of flames.
Description
Technical field
The present invention relates to the experimental technique field of extraneous wind speed to flame propagation and stability influence, being specifically related to for studying the device of extraneous wind speed to flame propagation and stability influence.
Background technology
Flame transmission feature and combustion stability thereof are one of study hotspots of domestic and international many scholars all the time.By studying the flame combustion characteristic of controlled burning, development condition and the combustion propagation process thereof of burning things which may cause a fire disaster diffusion combustion can be familiar with, thus derive the formation and development rule of the processes such as the fire under runaway combustion state further, this can be and effectively reduces fire provides necessity theoretical foundation and experiment basis to the harm that human society causes.
During the burning of geo-stationary burning things which may cause a fire disaster, flame experience is by the process of laminar combustion to turbulent combustion.The propagation of Flame front is irregular in this course.Numerous scholar carried out research and inquirement to this process, and had stated out this propagation characteristic.At present, part achievement is had for the propagation characteristic of geo-stationary burning things which may cause a fire disaster combustion flame and the theoretical research of stability, (the Li Yuhong such as Li Yuhong, Qi Haiying, Zhang Hongwu. detailed numerical value simulation [J] of methane premixed combustion flame. Engineering Thermophysics journal, 2002,23 (1): 119-122.) numerical simulation was carried out to the premixed combustion flame of methane, and obtained combustion process and comprise the CONCENTRATION DISTRIBUTION of CO and NO interior ten kinds of primitive components.EllisCdeCO(EllisCdeCO.Flamemovementingaseousexplosivemix tures [J] .JournalofFuelScience, 1928,7:502-508.) carry out CO and O
2premixed combustion experiment in a long closed conduct being 19.5cm, internal diameter 5cm, and in experimentation, combustion flame is taken, observed the abnormal propagation of Flame front, show that, in flame propagation process, Flame front changes the conclusion forming cusp backward into from bend forward.(the MatalonM such as M.Matalon, MetzenerP.Thepropagationofpremixedflamesinclosedtubes [J] .JournalofFluidMechanics, 1997, in one section of closed conduct, 336:331-350.) carried out the experimental study of premixed gas flame propagation, experimental result shows in flame propagation process, Flame front can form a lot of vortex, and these vortexs can cause the vortex of burnt gas, final formation Tulip flame structure.(the Liu Yuying such as Liu Yuying, MOSTJean-Miche, BAUERPhilippe, Yang Maolin. the flame holding [J] of dilute combustion. combustion science and technology, 2009,15 (2): 103-108.) by research to the methane air flame of nitrogen dilution, reactant preheat temperature and dilution rate two factors are discussed on the impact of flame holding, experimental result shows that reactant preheat temperature is more remarkable on the impact of flame holding, is the principal element affecting flame holding.
But these researchs are limited to the flame combustion of small-scale experiment in numerical simulation or hermetic and half-hermetic spaces mostly, and do not consider the impact of extraneous wind speed on flame transmission feature and stability.Under the operating mode of reality, flame combustion occurs mostly under wide-open system.Therefore, carry out the research of extraneous wind speed to flame transmission feature and stability influence and have more realistic meaning.
Summary of the invention
For making up the deficiency in above-mentioned background technology, the invention provides a kind of for studying the apparatus and method of extraneous wind speed to flame propagation and stability influence, to help researchist's simulating flame burning actual condition, fully realize under the impact of extraneous wind speed, flame develops into condition and the process thereof of turbulent combustion by laminar combustion, research and analyse flame propagation and stability features under different combustion power, different air quantity, different extraneous wind friction velocity, and the content distribution feature of burning primary product, thus control combustion process effectively.
Object of the present invention realizes one of at least by following technical solution.
For studying the device of extraneous wind speed to flame propagation and stability influence, comprise blower fan, air quantity regulate panel, wind speed is uniformly distributed panel, experiment tunnel, measuring wind speed window, flue gas measurement window, induced draft fan, support, Bunsen burner, height regulating platform, rubber tube, flowmeter, valve, gas bomb.Wherein, experiment tunnel supported by support, and experiment tunnel portal place is installed with blower fan successively respectively, air quantity regulates panel, wind speed is uniformly distributed panel, and experiment tunnel exit pipeline is connected with induced draft fan.It is that the flame of the circular flame confession Bunsen burner of 10cm puts in experiment tunnel that experiment tunnel bottom center line has apart from port one/3 place a diameter, Bunsen burner is placed on height regulating platform, the gas access connection rubber tube of Bunsen burner, be connected with the outlet valve of gas bomb by flowmeter at the end of rubber tube, by valve adjustable gas flow.
Further, described experiment tunnel is the centre of being made up of transparent grp is cuboid-type, and two ends are trumpet-shaped tunnel.Forward and backward of 3/4 place apart from experiment tunnel port and top center line have the circular measuring wind speed window that diameter is 10cm, measures real-time wind speed for anemoscope.The length of side that forward and backward two sides apart from 4/5 place of experiment tunnel port has 5 equidistant arrangement is the square flue gas measurement window of 5cm, and the probe for flue gas analyzer stretches into, and measures the content of burning primary product.
Further, described air quantity regulates panel to be an assembly, comprise handle, movable regulating plate, movable regulating plate center pit, fan-shaped air inlet, secured adjusted plate, fan-shaped air outlet and secured adjusted plate center pit, wherein, the mode that movable regulating plate and secured adjusted plate are installed on the same axis by movable regulating plate center pit and secured adjusted plate center pit is combined, and is mutually close to.Secured adjusted plate is fixed on experiment tunnel portal end flanges place with bolt succession, by rotating the handle on movable regulating plate, regulate the sector wind mouth overlapping area between secured adjusted plate and movable regulating plate, thus control the relative opening degree of air inlet and air outlet, and then control the size of air quantity.
Further, it is on one piece of dividing plate that described wind speed is uniformly distributed panel, offers 3 row 5 row circular vent, and to ensure that the wind speed profile entering experiment tunnel is even, the cross sectional shape of its dividing plate is square.
Further, described Bunsen burner is an assembly, and it comprises lamp bracket, lamp cylinder, artificial atmosphere ring, gas access.
Further, the basic operation process of described device is: be connected to by rubber tube on the gas access of Bunsen burner, first artificial atmosphere ring is transferred to full-shut position; The valve of crack gas bomb makes combustible gas flow into Bunsen burner, and rotary air regulating ring allows a small amount of fresh air enter Bunsen burner simultaneously, and then Bunsen burner is lighted in burning, and according to requirement of experiment, control valve and artificial atmosphere ring make flame height reach setting height; The Bunsen burner be burning is placed on height regulating platform, and flame is entered in experiment tunnel straight length through circular flame mouth, regulate the height of height regulating platform, make the bottom surface in the flame bottommost of Bunsen burner and experiment tunnel on a surface level.Open blower fan, turning handle, makes the wind speed in experiment tunnel straight length reach experiment setting value, or opens induced draft fan, and turning handle, makes the wind speed in experiment tunnel straight length reach setting value; Start whole measurement instrument, with the profile of digital camera record flame, temperature, the O with flue gas in thermometer and flue gas analyzer record experiment tunnel
2, CO, CO
2, NO, NO
xdeng concentration, with the flow velocity of anemoscope record flue gas, flow with cmf record combustion gas; To be coordinated with turning handle by control valve and artificial atmosphere ring, to realize the experiment condition under different combustion power, flame height, extraneous wind speed.After experiment, first artificial atmosphere ring is shut, then turn off the valve of gas bomb, extract rubber tube.
Wherein, described blower fan is contained on experiment tunnel portal end pipeline in the mode of Flange joint, and whether induced draft fan is contained on experiment tunnel exit end pipeline in the mode of Flange joint, can select as required to dismantle during experiment.
Wherein, the mode that described rubber tube connects with kink is connected between gas access and gas bomb.
Wherein, described wind speed is uniformly distributed the midsection place that panel is welded on experiment tunnel portal end horn-like tapered pipeline, regulates panel jointly to complete adjustment to air quantity with air quantity, and wind is flowed in an uniform way test in tunnel straight length.
During experiment, use during blower fan and induced draft fan need be pulled down, and use during induced draft fan and blower fan need be pulled down, the wind speed profile cross section that blower fan provides is parabolically shape, the wind speed profile that induced draft fan provides is uniform, therefore can study the impact of two kinds of different types of wind speed on flame propagation and stability.
During experiment, the flame size of Bunsen burner and highly all can regulating as required, the ratio of combustion gas and air is by the aperture of the valve of adjustments of gas steel cylinder, or the aperture of artificial atmosphere ring controls.Experimental provision is provided with multiple interfaces or measurement window, for corresponding instrument, each physical quantitys such as air mass flow, wind speed and the smoke components under various experimental study condition is measured.
The present invention is compared with existing experimental provision, and its useful remarkable result is as follows:
1, experimental provision research cost of the present invention is low, and structure is simple, easy to operate, controls flexibly, and experimental phenomena is easy to observe, and it is true and reliable to carry out research the data obtained.
2, compared with traditional fire test device, this experimental provision can carry out under extraneous wind speed and burning things which may cause a fire disaster point have certain relative velocity condition, flame propagation feature and stability experiment thereof are research flame structure and combustion characteristic, and analysis flame transmission characteristic sum stability provides experiment basis.
Accompanying drawing explanation
Fig. 1 is the present invention for studying the apparatus structure front view of extraneous wind speed to flame propagation and stability influence.
Fig. 2 is the present invention for studying the apparatus structure vertical view of extraneous wind speed to flame propagation and stability influence.
Fig. 3 is the structural representation of Bunsen burner.
Fig. 4 is the structural drawing that wind speed is uniformly distributed panel.
Fig. 5 a, Fig. 5 b are the structural drawing that air quantity regulates panel.
In figure: 1-blower fan; 2-air quantity regulates panel; 3-wind speed is uniformly distributed panel; 4-tests tunnel;
5-measuring wind speed window; 6-flue gas measurement window; 7-induced draft fan; 8-support; 9-Bunsen burner; 10-height regulating platform; 11-rubber tube; 12-flowmeter; 13-valve; 14-gas bomb; 15-circular flame mouth; 16-lamp bracket; 17-lamp cylinder; 18-artificial atmosphere ring; 19-gas access; 20-circular vent; 21-dividing plate; 22-handle; 23-movable regulating plate; 24-movable regulating plate center pit; The fan-shaped air inlet of 25-; 26-secured adjusted plate; The fan-shaped air outlet of 27-; 28-secured adjusted plate center pit.
Embodiment
Below in conjunction with drawings and Examples, the invention is further described:
Shown in the structure flow chart front view referring to Fig. 1 and Fig. 2 apparatus of the present invention and vertical view, for studying the apparatus structure front view of extraneous wind speed to flame propagation and stability influence, comprise blower fan 1, air quantity regulate panel 2, wind speed is uniformly distributed panel 3, experiment tunnel 4, measuring wind speed window 5, flue gas measurement window 6, induced draft fan 7, support 8, Bunsen burner 9, height regulating platform 10, rubber tube 11, flowmeter 12, valve 13, gas bomb 14, circular flame mouth 15.Wherein, experiment tunnel 4 supported by support 8, and experiment porch, tunnel 4 is installed with blower fan 1 successively respectively, air quantity regulates panel 2, wind speed is uniformly distributed panel 3, and experiment tunnel 4 outlet conduit is filled with induced draft fan 7.Wherein, air quantity regulates the secured adjusted plate 26 in panel 2 assembly to be fixed on experiment tunnel 4 inlet end flange with bolt succession, wind speed is uniformly distributed panel 3 and is welded on experiment tunnel 4 entrance, blower fan 1 and induced draft fan 7 are with in the form access device of Flange joint, and rubber tube 11 is connected on Bunsen burner 9 by kink.Having a diameter at experiment tunnel 4 bottom centre line-spacing entrance 1/3 place is that the circular flame mouth 15 of 10cm puts in experiment tunnel 4 for the flame of Bunsen burner 9, Bunsen burner 9 is placed on height regulating platform 10, gas access 19 connection rubber tube 11 of Bunsen burner 9, at the end of rubber tube 11, flowmeter 12 is housed, and be connected with the valve 13 of gas bomb 14, by the adjustable fuel gas flow of valve 13.It is that the circular measuring wind speed window 5 of 10cm measures real-time wind speed for anemoscope that forward and backward of inlet end 3/4 place of experiment tunnel 4 and top center line have diameter, the length of side that the forward and backward two sides at 4/5 place of experiment tunnel 4 inlet end has 5 equidistant arrangement is the square flue gas measurement window 6 of 5cm, probe for flue gas analyzer stretches into, and measures the content of burning primary product.In experiment, model can be adopted to be the anemoscope measuring wind of XMXR3-AZ8912, model can be adopted to be that O measured by the flue gas analyzer of IMR2000Marine
2and burning primary product CO, CO
2, NO, NO
xdeng content.
Described air quantity regulates panel 2 to be assemblies, comprise handle 22, movable regulating plate 23, movable regulating plate center pit 24, fan-shaped air inlet 25, secured adjusted plate 26, fan-shaped air outlet 27 and secured adjusted plate center pit 28, wherein, movable regulating plate 23 and secured adjusted plate 26 are combined by movable regulating plate center pit 24 and secured adjusted plate center pit 28 mode of installing on the same axis, and are mutually close to.
The basic process of the present invention when experiment test is as follows: when using blower fan 1 to test, unload induced draft fan 7, be connected to by rubber tube 11 on the gas access 19 of Bunsen burner 9, first artificial atmosphere ring 18 is transferred to full-shut position; The valve 13 of crack gas bomb 14 makes combustible gas flow into Bunsen burner 9, by the display reading of flowmeter 12, rotary air regulating ring 18 allows a small amount of fresh air enter Bunsen burner 9 simultaneously, then Bunsen burner 9 is lighted in burning, and according to requirement of experiment, control the aperture of the valve 13 of gas bomb 14, adjustment gas flow is to required numerical value, and artificial atmosphere ring 18 makes flame height reach setting height; The Bunsen burner 9 be burning is placed on height regulating platform 10, and flame is entered in experiment tunnel 4 straight length through circular flame mouth 15, regulate the height of height regulating platform 10, make the bottom surface in the flame bottommost of Bunsen burner 9 and experiment tunnel 4 on a surface level.Open blower fan 1, turning handle 22, regulating air volume, adopt anemoscope to measure real-time wind speed, make the wind speed in experiment tunnel 4 straight length reach experiment setting value; After waiting burning and steady air current after a while, start whole measurement instrument, adopt High-speed Schlieren Technique or with the profile of digital camera record flame, temperature, O with flue gas in thermometer and flue gas analyzer record experiment tunnel 4
2, CO, CO
2, NO, NO
xdeng concentration, with the flow velocity of anemoscope record flue gas, the flow recording combustion gas with flowmeter 12; Coordinated with turning handle 22 by control valve 13 and artificial atmosphere ring 18, realizing the experiment condition under different combustion power, flame height, extraneous wind speed, thus under obtaining each operating mode extraneous wind speed to flame propagation and stability influence experimental correlation data.After experiment, first artificial atmosphere ring 18 is shut, then turn off the valve 13 of gas bomb 14, extract rubber tube 11.
When using induced draft fan 7 to test, blower fan 1 is unloaded, carries out above-mentioned same operation.
Claims (10)
1. for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that comprising blower fan (1), air quantity regulates panel (2), wind speed is uniformly distributed panel (3), experiment tunnel (4), measuring wind speed window (5), flue gas measurement window (6), induced draft fan (7), support (8), Bunsen burner (9), height regulating platform (10), rubber tube (11), flowmeter (12), valve (13) and gas bomb (14), wherein, experiment tunnel (4) supported by support (8), experiment tunnel (4) porch is installed with blower fan (1) successively respectively, air quantity regulates panel (2), wind speed is uniformly distributed panel (3), experiment tunnel (4) outlet conduit is connected with induced draft fan (7), it is that the circular flame mouth (15) of 10cm puts in experiment tunnel (4) for the flame of Bunsen burner (9) that experiment tunnel (4) bottom centre line has apart from port one/3 place a diameter, Bunsen burner (9) is placed on height regulating platform (10), gas access (19) connection rubber tube (11) of Bunsen burner (9), be connected with the outlet valve (13) of gas bomb (14), by valve (13) adjustable gas flow by flowmeter (12) at the end of rubber tube (11).
2. according to claim 1 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described experiment tunnel (4) is the centre of being made up of transparent grp is cuboid-type, and two ends are trumpet-shaped tunnel; On forward and backward of 3/4 place of experiment tunnel (4) port and top center line, having the circular measuring wind speed window (5) that diameter is 10cm, the length of side that the forward and backward two sides apart from 4/5 place of experiment tunnel (4) port has 5 equidistant arrangement is the square flue gas measurement window (6) of 5cm.
3. according to claim 1 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described air quantity regulates panel (2) to be an assembly, comprise handle (22), movable regulating plate (23), movable regulating plate center pit (24), fan-shaped air inlet (25), secured adjusted plate (26), fan-shaped air outlet (27) and secured adjusted plate center pit (28), wherein, the mode that movable regulating plate (23) and secured adjusted plate (26) are installed on the same axis by movable regulating plate center pit (24) and secured adjusted plate center pit (28) is combined, and be mutually close to.
4. according to claim 1 one for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: it is on one piece of dividing plate (21) that described wind speed is uniformly distributed panel (3), offer 3 row 5 row circular vent (20), the cross sectional shape of dividing plate (21) is square.
5. according to claim 1 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described Bunsen burner (9) is an assembly, it comprises lamp bracket (16), lamp cylinder (17), artificial atmosphere ring (18), gas access (19).
6. according to claim 1 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: whether described blower fan (1) is contained on experiment tunnel (4) inlet end pipeline in the mode of Flange joint, can select as required to dismantle during experiment; Whether described induced draft fan (7) is contained on experiment tunnel (4) endpiece pipeline in the mode of Flange joint, can select as required to dismantle during experiment; When using blower fan (1), induced draft fan (7) is disassembled; When using induced draft fan (7), blower fan (1) is disassembled.
7. according to claim 1 or 3 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described secured adjusted plate (26) is fixed on experiment tunnel (4) inlet end flange with bolt succession, by rotating the handle (22) on movable regulating plate (23), regulate the relative position between secured adjusted plate (26) and movable regulating plate (23), thus control the relative opening degree of air inlet and air outlet, reach the object controlling air force.
8. according to claim 1 or 4 for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described wind speed is uniformly distributed the midsection place that panel (3) is welded on the horn-like tapered pipeline of experiment tunnel (4) inlet end, regulate panel (2) jointly to complete adjustment to air quantity with air quantity, and wind is flowed in experiment tunnel (4) straight length in an uniform way.
9. according to claim 1 a kind of for studying the device of extraneous wind speed to flame propagation and stability influence, it is characterized in that: described experimental provision is provided with multiple interfaces or measurement window, for corresponding instrument, the air mass flow under various experimental study condition, wind speed and smoke components physical quantity are measured.
10. utilize the device described in claim 1 to study the method for extraneous wind speed to flame propagation and stability influence, it is characterized in that: rubber tube (11) is connected on the gas access (19) of Bunsen burner (9), first artificial atmosphere ring (18) is transferred to full-shut position; The valve (13) of crack gas bomb (14) makes combustible gas flow into Bunsen burner (9), rotary air regulating ring (18) allows a small amount of fresh air enter Bunsen burner (9) simultaneously, then Bunsen burner (9) is lighted in burning, and according to requirement of experiment, control valve (13) and artificial atmosphere ring (18) make flame height reach setting height; The Bunsen burner be burning (9) is placed on height regulating platform (10), and make flame enter in experiment tunnel (4) straight length through circular flame mouth (15), regulate the height of height regulating platform (10), make the flame bottommost of Bunsen burner (9) and test the bottom surface in tunnel (4) on a surface level; Open blower fan (1), turning handle (22), the wind speed in experiment tunnel (4) straight length is made to reach experiment setting value, or open induced draft fan (7), turning handle (22), makes the wind speed in experiment tunnel (4) straight length reach setting value; Start whole measurement instrument, with the profile of digital camera record flame, temperature, the O with thermometer and flue gas analyzer record experiment tunnel (4) interior flue gas
2, CO, CO
2, NO, NO
xconcentration, with the flow velocity of anemoscope record flue gas, flow with the combustion gas of flowmeter (12) record; To be coordinated with turning handle (22) by control valve (13) and artificial atmosphere ring (18), to realize the experiment condition under different combustion power, flame height, extraneous wind speed; At the end of test, first artificial atmosphere ring (18) is shut, then turn off the valve (13) of gas bomb (14), extract rubber tube (11).
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| CN113447526A (en) * | 2021-06-29 | 2021-09-28 | 北京石油化工学院 | Device and method for testing ignition spreading characteristic of dust layer in pipeline |
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| CN105067026B (en) | 2017-10-20 |
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