CN111208313B - Method for acquiring real propagation speed of gas explosion flame in pipeline - Google Patents
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Abstract
The invention provides a method for acquiring the real propagation speed of gas explosion flame in a pipeline. The method for acquiring the real propagation speed of the gas explosion flame in the pipeline comprises the following steps: the method comprises the following steps: collecting an image of gas explosion flame propagation in the pipeline by using an image collector; step two: processing the gas explosion flame propagation image in the pipeline to extract the position information of the flame frontal surface; step three: correcting the position information of the flame front to obtain the actual position information of the flame front; step four: and acquiring the real propagation speed of the gas explosion flame in the pipeline according to the actual position information of the flame front. According to the method, the actual position information of the flame front can be obtained by correcting the position information of the flame front, and the actual speed of the propagation of the gas explosion flame in the pipeline can be obtained by utilizing the actual position information of the flame front.
Description
Technical Field
The invention relates to the technical field of combustion explosion prevention and control, in particular to a method for acquiring the real propagation speed of gas explosion flame in a pipeline.
Background
The flame propagation speed refers to the advancing speed of the flame front relative to the unburned combustible mixture along the normal direction of the flame front, and the flame propagation speed represents the moving speed of the flame front in the space for carrying out the combustion process, and is one of important data for researching the flame stability.
At present, when a gas/dust explosion experiment is carried out, a high-speed camera is generally adopted to carry out image acquisition on the flame propagation process of each combustible gas/dust explosion, and when flame propagation image data are processed, a self-programming program is generally used and a Canny algorithm is combined to carry out identification and extraction on flame frontal surface feature information. After the position parameters of the explosion propagation flame front are extracted, the position, speed and other parameters of the gas/dust explosion flame propagation are obtained according to the data of the size proportional relation between the actual size of the explosion container window and the picture, the ignition center position, the time corresponding to the flame front and the like. However, in the actual research process, the flame propagation speed value obtained according to the method has a large error.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention provides a method for acquiring the real propagation speed of gas explosion flame in a pipeline, which can effectively eliminate the error of the existing method, thereby acquiring the real propagation speed of the gas explosion flame in the pipeline.
The invention provides a method for acquiring the real propagation speed of gas explosion flame in a pipeline, which comprises the following steps:
the method comprises the following steps: collecting an image of gas explosion flame propagation in the pipeline by using an image collector;
step two: processing the gas explosion flame propagation image in the pipeline to extract the position information of the flame frontal surface;
step three: correcting the position information of the flame front to obtain the actual position information of the flame front;
step four: and acquiring the real propagation speed of the gas explosion flame in the pipeline according to the actual position information of the flame frontal surface.
In the first step of the present invention, the image collector for collecting the gas explosion flame propagation image in the pipeline is not strictly limited, and conventional instruments in the art, such as a high-speed camera, may be used.
In the second step of the present invention, the second step includes, for the blazed flame: and adjusting the contrast of the gas explosion flame propagation image in the pipeline, and then detecting the flame edge by adopting a Canny operator and extracting the position information of the flame frontal surface. FIG. 3 is a schematic diagram illustrating extraction of positional information of a highlight flame front according to one embodiment; the method for the strong light flame is a method in the prior art, and the strong light flame refers to the flame capable of extracting the position information of the flame frontal surface by adopting the method.
The inventor researches and discovers that for a weaker flame front, the concentration mainly exists near the explosion limit, and the collection of the characteristic information of the flame front is difficult to realize by adopting the method. In view of this, the present inventors have particularly proposed a method for extracting flame frontal surface position information for low-light flames; the low-light flame refers to a flame from which information on the position of the flame front cannot be extracted by the above method.
Specifically, for a low-light flame, the second step includes: and enhancing the gas explosion flame propagation image in the pipeline, then carrying out binarization processing, detecting the flame edge by using a Canny operator, and extracting the position information of the flame frontal surface. FIG. 2 is a schematic diagram illustrating extraction of location information of a low-light flame front according to an embodiment; as can be seen from FIG. 2, the method can effectively extract the position information parameters of the weak light flame front.
In the present invention, the enhancement mode of the gas explosion flame propagation image in the pipeline is not strictly limited, and a conventional method in the field, such as an impact algorithm, an artifact haze algorithm, etc., can be adopted.
The inventor finds that the flame propagation speed value obtained by the existing method has a large error due to the mode of acquiring the flame frontal surface image by the image acquisition instrument. Specifically, fig. 1 is a top view of a high-speed camera-blast propagation pipeline testing system, wherein: d is the inner diameter of the pipeline, L is the length of the inner window of the pipeline, and S is the vertical distance between the image acquisition instrument and the axial center section of the pipeline. In the process of acquiring the flame frontal surface image by the image acquisition instrument, due to the acquisition mode of the lens, the flame frontal surface positions in the flame propagation images acquired before and after the flame frontal surface passes through the image acquisition instrument are respectively displayed as L1 and L2, the actual positions are P1 and P2, and the included angles between the connecting line of the flame frontal surface and the lens of the image acquisition instrument and the side view window of the explosion pipeline are respectively alpha 1 and alpha 2. The resulting deviation is: when the flame frontal surface passes through the front of the lens of the image acquisition instrument, the flame frontal surface position L1 recorded by the image acquisition instrument is greater than the actual position P1, and the flame propagation speed obtained by the data is greater than the real speed; after the flame front passes through the lens of the image acquisition instrument, the recorded flame front position L2 is smaller than the actual position P2, and the flame propagation speed calculated by the data is smaller than the actual speed.
In view of the above problems, the method of the present invention corrects the flame front position information, so as to obtain the actual flame front position information, and the actual flame front position information can be used to obtain the true speed of flame propagation of gas explosion in the pipeline.
Specifically, the difference Δ L between the flame front position L1 and the actual position P1 recorded by the high-speed camera when the flame front passes in front of the lens of the high-speed camera can be obtained as follows:
tan(α 1 )＝0.5D/VL＝(S-0.5D)/(0.5L-L 1 )
then:
in this way it is possible to obtain,
that is, the actual position Pi of the flame front at this stage is in the following relationship with the position Li recorded by the high-speed camera:
that is to say, in the third step of the invention, before the flame front passes through the image acquisition instrument, the flame front position information is corrected by adopting the following formula:
wherein: pi is the flame frontal surface-actual position, li is the image acquisition instrument recording position, D is the pipeline inner diameter, L is the length of the internal window of the pipeline, and S is the vertical distance of the image acquisition instrument from the axial center section of the pipeline.
After the flame front passes through the lens of the high-speed camera, the difference value delta L' between the flame front position L2 recorded by the high-speed camera and the actual position P2 can be obtained by the following method:
tan(180-α 2 )＝0.5D/VL＝(S-0.5D)/(L 2 -0.5L)
then:
in this way it is possible to obtain,
that is, the following relationship is established between the actual position Pi of the flame front at this stage and the position Li recorded by the high-speed camera:
that is, in step three of the present invention, after the flame front passes through the image acquisition instrument, the flame front position information is corrected by using the following formula:
wherein: pi is the flame frontal surface-actual position, li is the image acquisition instrument recording position, D is the pipeline inner diameter, L is the length of the internal window of the pipeline, and S is the vertical distance of the image acquisition instrument from the axial center section of the pipeline.
The invention does not strictly limit the specific placement position of the image acquisition instrument, and when the gas explosion flame propagation image in the pipeline is acquired, the image acquisition instrument can be placed at the middle position of the length of the window in the pipeline.
At this time, in step three, the flame front position information is corrected by adopting the following formula:
wherein: pi is the flame frontal surface-actual position, li is the image acquisition instrument recording position, D is the pipeline inner diameter, L is the length of the internal window of the pipeline, and S is the vertical distance of the image acquisition instrument from the axial center section of the pipeline.
After explosion propagation flame front position parameters are extracted, according to the data such as the size proportional relation between the actual size of an explosion container window and a picture, the ignition center position and the time corresponding to the flame front, the position, the speed and other parameters of gas/dust explosion flame propagation are further obtained, and the parameters are shown in table 1.
TABLE 1 existing flame propagation velocity calculation method
In the present invention, the fourth step includes: and (4) making an explosion flame propagation time-flame frontal surface actual position curve according to the flame frontal surface actual position information, and performing first-order derivation on the explosion flame propagation time-flame frontal surface actual position curve to obtain the actual speed of gas explosion flame propagation in the pipeline.
TABLE 2 method for calculating the true propagation velocity of the flame in the pipe of the present invention
Compared with the prior art, the invention has the following beneficial effects:
1. the method can correct the flame front position information of the existing method, so that the actual flame front position information is obtained, and the actual flame front position information can be used for obtaining the actual speed of flame propagation of gas explosion in the pipeline;
2. according to the method, the propagation image of the gas explosion flame in the pipeline is enhanced and binarized, the flame edge is detected by a Canny operator, and the position information of the flame frontal surface is extracted, so that the position information parameters of the weak light flame frontal surface can be effectively extracted.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a high speed camera-blast propagation pipeline testing system;
FIG. 2 is a schematic diagram of extraction of location information of a low-light flame front according to an embodiment; wherein: a is an original image, b is an enhancement processing result, c is a binarization processing result, and d is a flame frontal surface edge extraction result;
FIG. 3 is a schematic diagram of an embodiment of extraction of location information of a highlight flame front; wherein: a is an original image, and b is a flame frontal surface edge extraction result.
Description of the reference numerals: 1: high-speed camera.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The embodiment provides a method for acquiring the real propagation speed of gas explosion flame in a pipeline, which comprises the following steps:
the method comprises the following steps: collecting gas explosion flame propagation image in pipeline
Specifically, a high-speed camera is adopted to acquire images of the propagation process of explosion flame of each combustible gas in the horizontal pipeline, wherein the high-speed camera is placed in the middle of the length of a window in the pipeline to acquire the propagation images of the explosion flame of the gas in the pipeline.
Step two: extracting flame frontal surface position information
Specifically, an extraction method for strong flames is adopted firstly, namely: after the contrast of a gas explosion flame propagation image in the pipeline is adjusted, the Canny operator is adopted to detect the flame edge and extract the position information of the flame frontal surface.
The extraction method aiming at the strong light flame is adopted for extraction, and the result shows that the position information of the flame frontal surface cannot be extracted, so that the following extraction method aiming at the weak light flame is adopted.
Namely: the method comprises the steps of firstly enhancing a flame propagation image of gas explosion in a pipeline by using an impact algorithm, then carrying out binarization processing, detecting flame edges by using a Canny operator, and extracting flame frontal surface position information.
Step three: correcting flame frontal surface position information
Specifically, the flame front position information is corrected by adopting the following formula:
referring to fig. 1, pi is the flame frontal surface-actual position, li is the recording position of the image acquisition instrument, D is the inner diameter of the pipeline, L is the length of the window in the pipeline, and S is the vertical distance between the image acquisition instrument and the axial center section of the pipeline.
And obtaining the actual position information of the flame front after correction according to the formula.
Step four: obtaining the true propagation speed of gas explosion flame in the pipeline
Specifically, an explosion flame propagation time-flame front actual position curve is made according to flame front actual position information, first-order derivation is performed on the explosion flame propagation time-flame front actual position curve, and the actual propagation speed of gas explosion flame in the pipeline is obtained, and the result is shown in table 3.
TABLE 3 calculation of the actual propagation velocity of flame in the pipe (Li < 0.5L) in example 1
Example 2
The embodiment provides a method for acquiring the real propagation speed of gas explosion flame in a pipeline, which comprises the following steps:
the method comprises the following steps: collecting gas explosion flame propagation image in pipeline
Specifically, a high-speed camera is adopted to collect images of the propagation process of explosion flame of each combustible gas in the horizontal pipeline, wherein the high-speed camera is placed in the middle of the length of a window in the pipeline to obtain the propagation images of the explosion flame of the gas in the pipeline.
Step two: extracting flame frontal surface position information
Specifically, an extraction method for strong light flames is adopted, namely: after the contrast of a gas explosion flame propagation image in the pipeline is adjusted, the Canny operator is adopted to detect the flame edge and extract the position information of the flame frontal surface.
Step three: correcting flame frontal surface position information
Specifically, the flame frontal surface position information is corrected by adopting the following formula:
referring to fig. 1, pi is the flame frontal surface-actual position, li is the recording position of the image acquisition instrument, D is the inner diameter of the pipeline, L is the length of the window in the pipeline, and S is the vertical distance between the image acquisition instrument and the axial center section of the pipeline.
And obtaining the actual position information of the flame front after correction according to the formula.
Step four: obtaining the true propagation speed of gas explosion flame in the pipeline
Specifically, an explosion flame propagation time-flame front actual position curve is made according to flame front actual position information, first-order derivation is carried out on the explosion flame propagation time-flame front actual position curve, the actual speed of gas explosion flame propagation in the pipeline is obtained, and the result is shown in table 4.
TABLE 4 calculation of the actual propagation velocity of the flame in the pipe of example 2 (Li > 0.5L)
Comparative example 1
The method is the same as the embodiment 1 except that the flame front position information is not corrected, and the propagation speed of the gas explosion flame in the pipeline is directly obtained according to the uncorrected flame front position information; the results of the flame propagation velocity calculations in the duct are shown in table 5.
TABLE 5 calculation of flame propagation velocity in the pipe of comparative example 1
Comparative example 2
The method is the same as the embodiment 2 except that the flame front position information is not corrected, and the propagation speed of the gas explosion flame in the pipeline is directly obtained according to the uncorrected flame front position information; the results of the flame propagation velocity calculations in the duct are shown in Table 6.
Table 6 calculation results of flame propagation speed in pipe of comparative example 2
The above results show that:
according to the method, the actual position information of the flame front can be obtained by correcting the position information of the flame front, and the actual speed of the gas explosion flame propagation in the pipeline can be obtained by utilizing the actual position information of the flame front.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for acquiring the real propagation speed of gas explosion flame in a pipeline is characterized by comprising the following steps:
the method comprises the following steps: collecting an image of gas explosion flame propagation in the pipeline by using an image collector;
step two: processing the gas explosion flame propagation image in the pipeline to extract the position information of the flame front;
step three: correcting the position information of the flame front to obtain the actual position information of the flame front;
step four: acquiring the real propagation speed of the gas explosion flame in the pipeline according to the actual position information of the flame frontal surface;
in the first step, when an image of gas explosion flame propagation in a pipeline is collected, an image collector is placed in the middle of the length of a window in the pipeline;
in the third step, the position information of the flame frontal surface is corrected by adopting the following formula:
wherein: pi is the flame frontal surface-actual position, li is the image acquisition instrument recording position, D is the pipeline inner diameter, L is the length of the internal window of the pipeline, and S is the vertical distance of the image acquisition instrument from the axial center section of the pipeline.
2. The method according to claim 1, wherein in step one, the image capturing device is a high-speed camera.
3. The acquisition method as claimed in claim 1, wherein for strong light flames, the second step comprises: and adjusting the contrast of the gas explosion flame propagation image in the pipeline, and then detecting the flame edge by adopting a Canny operator and extracting the position information of the flame frontal surface.
4. The acquisition method according to claim 1, wherein for low light flame, the second step comprises: and enhancing the gas explosion flame propagation image in the pipeline, then carrying out binarization processing, detecting the flame edge by using a Canny operator, and extracting the position information of the flame frontal surface.
5. The acquisition method according to claim 4, characterized in that said enhancement is performed using an Implement algorithm or an Imredevent algorithm.
6. The acquisition method according to claim 1, wherein step four comprises: and making an explosion flame propagation time-flame frontal surface actual position curve according to the flame frontal surface actual position information, and performing first-order derivation on the explosion flame propagation time-flame frontal surface actual position curve to obtain the true propagation speed of the gas explosion flame in the pipeline.
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