CN101661049B - Method for counting propagation velocity of pipeline gas explosion flame - Google Patents
Method for counting propagation velocity of pipeline gas explosion flame Download PDFInfo
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- CN101661049B CN101661049B CN200910180417XA CN200910180417A CN101661049B CN 101661049 B CN101661049 B CN 101661049B CN 200910180417X A CN200910180417X A CN 200910180417XA CN 200910180417 A CN200910180417 A CN 200910180417A CN 101661049 B CN101661049 B CN 101661049B
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Abstract
The invention discloses a method for counting the propagation velocity pipeline gas explosion flame, comprising the steps: installing a high-speed photographic device at a gas explosion pipeline visual window; rapidly shooting gas explosion flame according to a certain frequency; analyzing and processing shot image to obtain related coefficients that the image corresponds to practical size; respectively cutting down two adjoining images according to longitudinal pictures corresponding to the unit length of horizontal axis from two directions to obtain the related coefficients of the two cut images; counting flame move distance according to the cutting length corresponding to the maximum related coefficient; and counting the propagation velocity of the gas explosion flame after converting the flame move distance to the practical size. The method can count the propagation velocity of the front gas explosion flame, count the propagation velocity of the flame that fills with a whole pipeline, and count the positive velocity and the opposite velocity of the explosion flame, and is suitable for counting the propagation velocity of the explosion flame of solids in the pipeline, such as dust, explosive, etc.
Description
Technical field
The present invention relates to a kind of computing method of gas burst flame propagation velocity, belong to combustion explosion and safety technique field, particularly a kind of method of utilizing high-speed photography image calculation pipeline gas burst flame propagation velocity.
Background technology
Coal is the important basic industry of China, and for a long time, coal all accounts for more than 2/3 in China's primary energy production and consumption constitutes, but the sternness of mine safety form.Coal in China is pit mining more than 95%, because the geologic condition that the coal tax is deposited is complicated and changeable, it is generally higher that content is deposited in the coal-bed gas tax, and the mine of exploitation all is gassy mine more than 30% now.Since the establishment of the nation, the above accident of once dead hundred people takes place 23 altogether, and wherein gas (perhaps gas and coal dust) explosion accident takes place 21, accounts for 91.3%.Gas be a kind of with absorption and free two states be present in coal seam and the coal measure strata, can gush out to the digging space during exploitation, gas has burning, explosive nature thereof, after mixing with air or oxygen and reaching finite concentration, in case run into the effect that certain intensity is brought out energy, can burn, explode.Gas explosion is one of disaster the most serious in the colliery, and Gas Explosion Accidents in Coal Mines tends to cause ventilating system to destroy, distinguished and admirable disorder, and toxic and harmful spreads, even continuous disaster accident takes place, and brings great difficulty and danger to disaster relief work.Coal demand increased substantially in recent years, coal mining enterprise's production scale increases, many super-huge mining areas such as tafelberg, Huainan, Jixi, Hegang etc. increase mining depth and intensity in succession, the gas pressure and the [underground in coal seam are more and more higher, pernicious gas explosion accident happens occasionally, restricting the safety in production in colliery just more and more, the gas risk has constituted one of the most serious security risk in colliery.In addition, gas explosion meeting hoisting crane is deposited on the deposition coal dust of bottom, tunnel and forms more violent subsequent explosion.Simple gas or coal dust explosion take place seldom, and dust explosion accident usually is mixed explosion, acting in conjunction, and its extent of injury is more much bigger than single gas or coal dust explosion.
Also run into the situation of gas burst through regular meeting in chemical industry.Chemical industry is the basic industries of national economy, belongs to the pillar industry of China.But since hazardous chemical intrinsic inflammable and explosive, poisonous and hazardous characteristic, make safety problem be even more important.At present, the chemical industry security situation of China is more serious, and all kinds of accidents and occupational hazards are frequent, has become the major issue that restriction China chemical industry develops in a healthy way, and national all kinds of casualty accident sums are high, and presents the trend of continuous rising.According to incompletely statistics, about 109 of the fire explosion that China 2001-2006 Chemical Manufacture, distributors take place, dead 440 people bring about great losses to people's lives and properties simultaneously, bring severe contamination to local environment.As on September 2nd, 1999, Baiyin City, the Gansu Province TDI of factory (toluene diisocyanate) the production line phosgene chamber accident of blasting caused 3 people's death, 5 people's severe injuries, and 8 people's slight wounds, direct economic loss reaches 4821.8 ten thousand yuan, belongs to special major accident.On May 11st, 2007, the nitrated device in bigization TDI company's T DI workshop, the chemical industry group Cangzhou accident of blasting causes 5 people's death, and 80 people are injured, 14 people's severe injuries wherein, and the on-site electric power system is badly damaged, and near several thousand masses in village evacuate transfer.
How effectively preventing burning, the blast of gas and chemical gas at the scene is the difficult problem that current urgent need solves, and utilizes the dynamic communication evolution rule of gas burst flames such as laboratory blast pipeline research gas to have great importance.
At present, the dynamic change of laboratory pipe explosion experimental system learning gas explosive flame often adopts the flame velocity measuring system to carry out the measurement of flame propagation velocity, the flame velocity measuring system adopts the method for opto-electronic conversion, arrange a plurality of photoelectric probe at experimental channel along journey, what it was measured is to face the average velocity that two flame fronts between the probe are propagated mutually, can not quantize the flame transmission rule.Design a kind of accurately, method is come the dynamic communication evolution rule of learning gas explosive flame easily, just becomes the problem to be solved in the present invention.
Summary of the invention
In view of the actual conditions in the above-mentioned prior art field, the present invention aims to provide the method for simple, the accurate rule of learning gas explosive flame dynamic communication evolution easily of a kind of process.
The present invention is achieved through the following technical solutions:
A kind of method of counting propagation velocity of pipeline gas explosion flame comprises: at gas burst pipeline form the high-speed photography device is installed, is determined filming frequency, gas burst flame is carried out high-speed capture; Determine the corresponding relation between photographic images and actual window dimension; Adjacent photographic images is reduced according to vertical picture of the unit length correspondence of transverse axis from both direction respectively, asked for the related coefficient of being reduced two width of cloth images, determine flame displacement by the reduction size of related coefficient maximal value correspondence; Calculate the actual range that flame moves according to corresponding relation, calculate the actual speed of flame propagation in conjunction with filming frequency.
Described photographic images can carry out the cutting of edge part.Each shooting all will be carried out the related calculating of single width photographic images and actual window dimension, determines the corresponding relation of every width of cloth photographic images size and actual window dimension.
The speed of described high-speed capture is at least greater than the twice of flame propagation velocity.
Described filming frequency is 1000 width of cloth/s, 2000 width of cloth/s or 5000 width of cloth/s.
Described reduction process is reduced according to vertical picture of transverse axis pixel correspondence.
A kind of method of utilizing high-speed photography image calculation pipeline gas burst flame propagation velocity of the present invention, carry out high-speed capture by the high-speed photography device being installed at gas burst pipeline form, utilize image processing techniques that the image of high-speed photography collection is carried out respective handling, draw accurately gas burst flame transmission speed in the pipeline at last, thereby provide foundation for the dynamic communication evolution rule of analytical gas explosive flame.This method not only can obtain the velocity of propagation of gas burst flame front, velocity of propagation in the time of can also asking for flame and be full of whole pipe, this method can be asked for the forward and reverse speed of explosive flame simultaneously, can obtain the dynamic communication evolution rule of flame.This method goes for asking for solid explosive flame velocity of propagation simultaneously.Whole computation process accurately, has conveniently truly reflected the dynamic communication evolution rule of gas burst flame, is highly suitable for promoting in the research of gas burst law of flame, using.
Description of drawings
Fig. 1 measures the related coefficient curve map of two width of cloth images that calculate for the method for the invention;
Fig. 2 is the curve map of the explosive flame velocity of propagation Changing Pattern of the method for the invention calculating.
Embodiment
Central idea of the present invention is by at gas burst pipeline form the high-speed photography device being installed, gas burst flame is carried out high-speed capture according to certain frequency, then the image utilization image processing techniques of taking is handled, obtain the dynamic communication evolution rule of gas burst flame at last, for the gas explosion process in solution and the pilot piping provides foundation.
For explanation visually utilizes the method for high-speed photography image calculation pipeline gas burst flame propagation velocity, below the present invention is done further specific explanations and description:
One, specifically the device and structure
Adopt internal diameter of the pipeline 80mm * 80mm, length is that the closed conduit of 24m is as research object, be full of 9.5% methane air mixed gas in the full pipe, duct wall is provided with airtight transparent window, sealing joint strip is housed around the form, high-speed camera is installed on the transparent window carrying out high-speed capture in managing, and shooting speed is 2000 width of cloth/s, and photo resolution is 252 * 186.Certainly, also can as required shooting speed be decided to be the 1000 width of cloth/s or 5000 width of cloth/s, its setting can be decided as required.
Two, experimentation
Light mixed gas in the pipeline, mixed gas flame in the combustion explosion process begins to propagate in pipeline, high-speed camera is taken the flame propagation process that constantly changes in the pipeline at any time by transparent window, carry out the flame propagation process analysis procedure analysis by a succession of photograph image that collects, calculate flame propagation velocity in the interior gas explosion process of pipeline, analyze communication process.
Three, image analysis process
1, the contact of picture size and physical size
The corresponding relation that must set up picture size and physical size can calculate flame transmission speed.Because take in the explosive flame communication process in high-speed photography, high-speed camera all needs to adjust distance and focusing at every turn, therefore the image of at every turn shooting all has different with physical size, and the flame propagation analytic process in later stage image to take all, so need set up the corresponding relation of image and physical size at each shooting environmental, assurance can reflect actual change in size by image and corresponding relation, truly explains flame travel and communication process.So, to high-speed capture to window dimension at first to discern, as the window dimension when testing is 190 * 70mm, the image resolution ratio of taking is 252 * 186, window dimension in the combining image, just can obtain the corresponding relation k=0.844 between image distance and the actual range, just can calculate the actual range that the image middle distance reflects at any time according to this corresponding relation.
2, image disruption is handled
Since when sight glass is installed in order to guarantee impermeability, added one deck caulking gum pad at the edge, the glass vision panel edge of shooting can be affected, shade is arranged and be not the straight line of standard, therefore in order to reduce error, need reduce affected marginal portion around the image, obtain the image of real useful and standard, guarantee the accuracy of image and measuring process.
3, the velocity of propagation of explosive flame is calculated principle
Explosive flame when the glass vision panel, adjacent two width of cloth images that utilize high-speed camera to photograph, only require back piece image than the distance of last sub-picture motion change, just can be regarded as out the speed of flame propagation according to filming frequency.
The present invention adopts two adjacent images is laterally reduced on the edge respectively, constantly compares the similarity degree of two width of cloth images in the cutting process, thereby determines the displacement between image under the most similar state, finishes the displacement of maximum correlation coefficient method and calculates.For example: under the enough fast situation of high-speed photography shooting speed, first width of cloth flame segment distance Δ L that travelled forward, photographed second width of cloth flame, if with the distance of first width of cloth image motion, promptly reduce, simultaneously near the right side correspondence image of second width of cloth image, with second width of cloth image is that the image of image left side move distance correspondence is reduced, it is exactly like the maximal phase that two width of cloth images compare, and at this moment, the image distance that crops is exactly the displacement of flame.
In the actual computation, first width of cloth image right side is reduced along unit picture element, simultaneously, second width of cloth image left side is reduced along unit picture element, and every reduction unit picture element is just asked for the similarity coefficient of two width of cloth figure, the reduction length of the maximum similarity coefficient correspondence that obtains at last, be exactly the length distance Δ p of motion, its corresponding actual range is exactly Δ L=k * Δ p, need suppose that at this image taking speed is enough fast, and first width of cloth image also moves fully and just photographed second width of cloth figure above form.The time interval of two width of cloth images just can calculate from the filming frequency of high-speed camera, thereby can accurately calculate the actual speed of flame propagation.
In sum, the concrete steps of a kind of counting propagation velocity of pipeline gas explosion flame of the present invention comprise:
At first, at gas burst pipeline form the high-speed photography device is installed, is determined filming frequency, the speed of high-speed capture greater than the twice of flame propagation velocity, is carried out high-speed capture to gas burst flame at least, finishes the image acquisition of flame detonation propagation process.
Secondly, according to circumstances the sealing joint strip to the photographic images periphery carries out corresponding cutting, guarantees the accuracy and the validity on edge, image surrounding, avoids because the picture size error of calculation that the out-of-flatness of sealing joint strip limit portion brings.Photographic images after the cutting carries out dimension relationship according to the size of image and the size of actual form, determines the corresponding relation between photographic images and physical size, calculates coefficient of correspondence.Wherein, because each experiment high speed camera will focus again, all to carry out related calculatings with actual window dimension for each experiment photographic images, to determine to test the corresponding relation of photographic images size and actual window dimension at every turn.
Then, the adjacent image that photographs is reduced according to vertical picture of transverse axis pixel correspondence from both direction respectively, constantly asking for the related coefficient of being reduced two width of cloth images in the reduction process, determine flame displacement by the reduction size of related coefficient maximal value correspondence.Wherein, what first width of cloth image was reduced is the part that initial flame shifts out in second width of cloth image, and what second width of cloth image was reduced is not have the part of shift-in then in first width of cloth image.Along with first width of cloth figure shifts out part and second width of cloth figure shift-in part is fallen 1 by reduction successively, 2, the distance of N (N is less than the image maximum pixel) pixel, ask for the related coefficient of reducing back two width of cloth images, the pixel count n that is reduced when drawing the related coefficient maximum has just obtained the distance P that pixel moves.No matter whether be full of form and can adopt the method for flame.Fig. 1 is the related coefficient curve map of two width of cloth images, and wherein maximum correlation coefficient is 0.9880, pixel displacement P=15 pixel.
At last, calculate the actual range that pixel moves, calculate the actual speed of flame propagation in conjunction with filming frequency according to the corresponding relation of pixel displacement and picture size and physical size.The time of two width of cloth image spacings: t=0.5ms, flame propagation velocity:
As shown in Figure 2, utilize said method can obtain gas burst flame propagation velocity dynamic rule in time in one group of pipeline.Can see from the image of high-speed capture and the variation of entire image direction of motion and duration to utilize the image related coefficient to ask for the velocity of propagation of image, quantitative description the process of gas burst image propagates in the pipeline.
Utilize this method not only can obtain the velocity of propagation of gas burst flame front in addition, the velocity of propagation in the time of can also asking for flame and be full of whole pipe has the popularity of versatility and application.
Claims (5)
1. the method for a counting propagation velocity of pipeline gas explosion flame is characterized in that, comprising:
At gas burst pipeline form the high-speed photography device is installed, is determined filming frequency, gas burst flame is carried out high-speed capture;
Determine the corresponding relation between photographic images and actual window dimension;
The adjacent image that photographs is reduced according to vertical picture of transverse axis pixel correspondence from both direction respectively, what first width of cloth image was reduced is the part that initial flame shifts out in second width of cloth image, what second width of cloth image was reduced is not have the part of shift-in then in first width of cloth image, along with first width of cloth figure shifts out part and second width of cloth figure shift-in part is fallen 1 by reduction successively, 2, the distance of N pixel, N is less than the image maximum pixel, ask for the related coefficient of reducing back two width of cloth images, the pixel count n that is reduced when drawing the related coefficient maximum has just obtained the distance that pixel moves;
Calculate the actual range that flame moves according to corresponding relation, calculate the actual speed of flame propagation in conjunction with filming frequency.
2. the method for a kind of counting propagation velocity of pipeline gas explosion flame according to claim 1 is characterized in that, described photographic images carries out the cutting of edge part.
3. the method for a kind of counting propagation velocity of pipeline gas explosion flame according to claim 1 and 2, it is characterized in that, each shooting all will be carried out the related calculating of single width photographic images and actual window dimension, determines the corresponding relation of every width of cloth photographic images size and actual window dimension.
4. the method for a kind of counting propagation velocity of pipeline gas explosion flame according to claim 1 is characterized in that, the speed of described high-speed capture is at least greater than the twice of flame propagation velocity.
5. the method for a kind of counting propagation velocity of pipeline gas explosion flame according to claim 1 is characterized in that, described filming frequency is 1000 width of cloth/s, 2000 width of cloth/s or 5000 width of cloth/s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102879144A (en) * | 2012-10-09 | 2013-01-16 | 常州大学 | Method and device for measuring hyperpressure of flammable gas explosion shock waves |
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| CN107645630B (en) * | 2016-07-20 | 2021-02-23 | 中兴通讯股份有限公司 | Image pickup processing method and device |
| CN106979959B (en) * | 2017-03-31 | 2019-06-11 | 大连理工大学 | Dust explosion flame transmission measuring behavior experimental system |
| CN110058039A (en) * | 2019-04-29 | 2019-07-26 | 中国矿业大学(北京) | A kind of detonator explosion velocity measurement method based on digital picture correlation |
| CN110967443B (en) * | 2019-12-27 | 2022-03-04 | 江苏中烟工业有限责任公司 | Method for detecting instantaneous burning rate of cigarette through infrared image |
| CN111208313B (en) * | 2020-01-15 | 2023-01-31 | 西安科技大学 | Method for acquiring real propagation speed of gas explosion flame in pipeline |
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| CN102879144A (en) * | 2012-10-09 | 2013-01-16 | 常州大学 | Method and device for measuring hyperpressure of flammable gas explosion shock waves |
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