CN114486644B - Mixing visual test bed and mixing uniformity detection method - Google Patents
Mixing visual test bed and mixing uniformity detection method Download PDFInfo
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- 238000002156 mixing Methods 0.000 title claims abstract description 63
- 230000000007 visual effect Effects 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 94
- 238000012800 visualization Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims 1
- 238000009826 distribution Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 14
- 239000002283 diesel fuel Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000002912 waste gas Substances 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
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- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
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- 241001330002 Bambuseae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention provides a mixing visual test bed and a mixing uniformity detection method. Mix visual test platform and include: the visual structure comprises an annular shell and a cover plate arranged at one end of the annular shell, wherein the annular shell is provided with a first transparent part, and the cover plate is provided with a second transparent part; the feeding structure comprises an air inlet part and a liquid inlet part; one end of the mixer is communicated with the air inlet part and the liquid inlet part, and the other end of the mixer is communicated with the inner cavity of the visual structure; the light emitting end of the laser generator is arranged corresponding to the first transparent part; the image acquisition device is arranged corresponding to the second transparent part; one end of the connecting cylinder is connected with the feeding structure, and the mixer is arranged between the feeding structure and the connecting cylinder; the air outlet cylinder is connected with the other end of the connecting cylinder, is positioned in the inner cavity of the visual structure and is provided with a plurality of through holes. The invention solves the problem that in the prior art, workers cannot acquire the mixing condition in the mixer.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a mixing visual test bed and a mixing uniformity detection method.
Background
At present, in the diesel engine design stage, a doc (diesel Oxidation catalyst), a dpf (diesel Particulate filter), and an scr (selective Catalytic reduction) are generally combined in an aftertreatment arrangement manner. The DOC can remove most pollutants to reduce the content of carbon monoxide and hydrocarbon, and can also raise the exhaust temperature through diesel oxide to realize DPF regeneration so as to ensure that the carbon loading in the DPF is at a reasonable level.
However, in the prior art, the diesel particle speed distribution at the DOC inlet section is quite disordered, and workers cannot obtain the mixing condition inside the DOC mixer, so that the problem of insufficient fuel oil oxidation in the running process of an engine exists, and the emission of PM2.5 is increased.
Disclosure of Invention
The invention mainly aims to provide a mixing visual test bed and a mixing uniformity detection method, and aims to solve the problem that in the prior art, workers cannot acquire the mixing condition inside a mixer.
In order to achieve the above object, according to one aspect of the present invention, there is provided a hybrid visualization test stand including: the visual structure comprises an annular shell and a cover plate arranged at one end of the annular shell, wherein the annular shell is provided with a first transparent part, and the cover plate is provided with a second transparent part; the feeding structure comprises an air inlet part and a liquid inlet part; one end of the mixer is communicated with the air inlet part and the liquid inlet part, and the other end of the mixer is communicated with the inner cavity of the visual structure; the light emitting end of the laser generator is arranged corresponding to the first transparent part; the image acquisition device is arranged corresponding to the second transparent part; one end of the connecting cylinder is connected with the feeding structure, and the mixer is arranged between the feeding structure and the connecting cylinder; the end part of the air outlet cylinder is connected with the other end of the connecting cylinder, the air outlet cylinder is positioned in an inner cavity of the visual structure, and a plurality of through holes are formed in the wall of the air outlet cylinder.
Furthermore, the annular shell is provided with an arc-shaped opening, and the first transparent part is arc-shaped and is detachably arranged at the arc-shaped opening; the cover plate is detachably connected with the annular shell.
Further, the visualization structure further comprises: the annular clamping piece is sleeved on at least part of the annular shell and at least part of the first transparent part so as to connect the annular shell and the first transparent part; wherein, the annular clamping piece is one; or, annular joint spare is a plurality of, and a plurality of annular joint spare sets up along the axial interval of annular casing.
Further, the hybrid visualization test stand further comprises: a base; the bracket is arranged on the base and used for supporting the annular shell; the first guide rail is arranged on the base and extends along the height direction of the mixed visual test bed; the first sliding block is movably arranged on the first guide rail, and the image acquisition device is arranged on the first sliding block.
Further, mix visual test platform still includes: the second guide rail is arranged on the base and extends along the length direction or the width direction of the hybrid visual test bed; the second sliding block is movably arranged on the second guide rail, and the laser generator is arranged on the second sliding block and located below the first transparent portion.
According to another aspect of the present invention, there is provided a method for detecting mixing uniformity, which is suitable for the above-mentioned mixing visualizationThe test bed is changed, and the mixing uniformity detection method comprises the following steps: acquiring an image acquired by an image acquisition device of the hybrid visual test bed; equally dividing the image into m sectors, and obtaining the standard deviation of the number of diesel particles in each sector
According to standard deviation
Judging the consistency of the number of the diesel particles in each sector; analyzing the standard deviation of the radial distance of the diesel particles in each sector one by one
Standard deviation of sum radian
In terms of radial distance standard deviation
Standard deviation of sum radian
And judging whether the diesel particles in each sector are uniformly distributed or not.
Further, the standard deviation of the number of diesel particles in each sector is obtained
The method comprises the following steps: according to
Obtaining; wherein, the image has N diesel particles, and the actual number of particles in each sector is
。
Further, the radial distance standard deviation
The calculation method comprises the following steps:
(ii) a Wherein the image is circular and has a radius of R, N diesel particles are evenly distributed on the sector edges of each sector,
the distance difference of the ith diesel particle and the reference diesel particle close to the fan-shaped edge of the diesel particle in the radial direction is shown; standard deviation of radian
The calculation method comprises the following steps:
(ii) a Wherein,
is the included angle between the ith diesel particle and the fan-shaped edge close to the diesel particle.
Further, according to standard deviation
The method for judging the consistency of the number of the diesel particles in each sector comprises the following steps: when standard deviation of
When the number of the diesel particles in each sector is zero, judging that the number of the diesel particles in each sector is equal; when standard deviation of
And when the number of the diesel particles is more than 0 and less than or equal to 0.1, judging that the number of the diesel particles in each sector is consistent.
Further, according to the standard deviation of the radial distance
Standard deviation of sum radian
The method for judging whether the diesel particles in each sector are uniformly distributed comprises the following steps: according to
To obtain uniformity of an image
At least two images are respectively obtained at the positions of other sections of the annular shell of the mixed visual test bed, and the uniformity of each image is respectively obtained
For a plurality of uniformity
The average value is calculated to obtain the mixing uniformity of the mixing visual test bed
(ii) a Wherein, in the mixing uniformity
And when the mixing uniformity is more than 0 and less than or equal to 0.5, judging that the mixing uniformity of the mixing visual test bed is better.
By applying the technical scheme of the invention, the hybrid visual test bed comprises an annular shell and a cover plate, wherein the annular shell is provided with a first transparent part, and the cover plate is provided with a second transparent part. The light emitting end of the laser generator is arranged corresponding to the first transparent part, and the image acquisition device is arranged corresponding to the second transparent part. Therefore, in the process of mixing the diesel particles and the exhaust gas by the mixing visual test bed, the laser generator emits laser, and the laser penetrates through the first transparent part and then irradiates into the annular shell. The image acquisition device gathers the mixing condition of diesel oil particle and waste gas in to the annular housing, and then has solved the problem that the staff can't acquire the inside mixing condition of blender among the prior art to the staff is follow-up detects and judges the mixing uniformity and the mixed effect of blender.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a front view of an embodiment of a hybrid visualization test stand according to the invention;
FIG. 2 shows a schematic partial cross-sectional structural view of the hybrid visualization test stand of FIG. 1;
FIG. 3 is a schematic diagram showing the uniform distribution of all diesel particles in an image acquired by an image acquisition device;
FIG. 4 shows a schematic diagram of a certain sector portion of the non-uniform distribution of diesel particles;
figure 5 shows a schematic view of a certain sector portion of a uniform distribution of diesel particles.
Wherein the figures include the following reference numerals:
10. an annular housing; 11. a first transparent part; 20. a cover plate; 30. a feed structure; 40. a mixer; 50. a laser generator; 60. an image acquisition device; 70. an annular clamping member; 80. a base; 90. a support; 100. a first guide rail; 110. a first slider; 120. a second guide rail; 130. a second slider; 140. post-processing the connecting pipe; 150. a front surge tank; 160. an exhaust gas flow meter; 170. a post-voltage stabilization box; 180. an exhaust connecting pipe; 190. a motor; 200. a fan; 210. a connecting cylinder; 220. an air outlet cylinder.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.
In order to solve the problem that in the prior art, a worker cannot acquire the internal mixing condition of the mixer, the application provides a mixing visual test bed and a mixing uniformity detection method.
As shown in fig. 1 and 2, the mixing visualization test stand comprises a visualization structure, a feeding structure 30, a mixer 40, a laser generator 50, an image acquisition device 60, a connecting cylinder 210 and an air outlet cylinder 220. Wherein, the visualization structure comprises an annular shell 10 and a cover plate 20 arranged at one end of the annular shell 10, the annular shell 10 is provided with a first transparent part 11, and the cover plate 20 is provided with a second transparent part. The feed structure 30 includes a gas inlet portion and a liquid inlet portion. One end of the mixer 40 is communicated with the air inlet part and the liquid inlet part, and the other end of the mixer 40 is communicated with the inner cavity of the visual structure. The light emitting end of the laser generator 50 is disposed corresponding to the first transparent part 11. The image capturing device 60 is disposed corresponding to the second transparent portion. One end of the connecting cylinder 210 is connected to the feeding structure 30, and the mixer 40 is disposed between the feeding structure 30 and the connecting cylinder 210. The tip of gas outlet cylinder 220 is connected with the other end of connecting cylinder 210, and gas outlet cylinder 220 is arranged in visual structure's inner chamber, has a plurality of via holes on gas outlet cylinder 220's the section of thick bamboo wall.
By applying the technical scheme of the embodiment, the hybrid visualization test bed comprises an annular shell 10 and a cover plate 20, wherein the annular shell 10 is provided with a first transparent part 11, and the cover plate 20 is provided with a second transparent part. The light emitting end of the laser generator 50 is disposed to correspond to the first transparent part 11, and the image collecting device 60 is disposed to correspond to the second transparent part. Thus, in the process of mixing the diesel particles and the exhaust gas by the mixing visual test bench, the laser generator 50 emits laser, and the laser passes through the first transparent part 11 and then irradiates into the annular housing 10. Image acquisition device 60 gathers the mixed condition of diesel oil particle and waste gas in annular housing 10, and then has solved the problem that the staff can't obtain the inside mixed condition of blender among the prior art to the staff is follow-up detects and judges the mixing homogeneity and the mixed effect of blender.
In the present embodiment, the annular housing 10 has a mounting hole, the connecting cylinder 210 is inserted into the mounting hole, and the flanging structure of the mixer 40 is clamped between the feeding structure 30 and the connecting cylinder 210 to achieve the communication between the mixer 40 and the feeding structure 30. Meanwhile, the mixed medium enters the inner cavity of the visual structure through the through hole. Specifically, the air outlet cylinder 220 includes an annular cylinder body and a cylinder cover, and the cylinder cover is disposed at one end of the annular cylinder body far away from the connecting cylinder 210. The annular cylinder body and the cylinder cover are both made of polytetrafluoroethylene glass, so that the air outlet cylinder 220 is of a visual structure.
In the present embodiment, the central angle of the first transparent part 11 is 180 °.
Specifically, the first transparent portion 11 and the second transparent portion are made of teflon glass, so that light emitted from the light emitting end of the laser generator 50 can pass through the first transparent portion 11 and the image acquisition device 60 to acquire the mixed condition inside the visual structure.
Alternatively, the annular housing 10 has an arc-shaped opening, the first transparent part 11 is arc-shaped and is detachably disposed at the arc-shaped opening, and the cover plate 20 is detachably connected with the annular housing 10. Therefore, the arrangement facilitates the replacement of the first transparent part 11 by workers, and the labor intensity of the workers is reduced. Meanwhile, the arrangement makes the disassembly and assembly of the cover plate 20 and the annular shell 10 easier and simpler, and reduces the disassembly and assembly difficulty.
In the present embodiment, the arc-shaped opening extends along the circumferential direction of the annular housing 10, and the first transparent portion 11 is detachably disposed at the arc-shaped opening, so that the annular housing 10 is a closed housing.
As shown in fig. 1 and 2, the visualization structure further comprises an annular snap 70. Wherein, the annular clamping member 70 is sleeved on at least a part of the annular housing 10 and at least a part of the first transparent portion 11 to connect the annular housing 10 and the first transparent portion 11. In this way, the first transparent part 11 and the annular housing 10 are connected together by the annular clamping piece 70, so that the first transparent part 11 and the annular housing 10 are easier and simpler to disassemble and assemble, and the disassembling and assembling difficulty is reduced.
In this embodiment, the annular clip 70 is a clip, and the annular housing 10 and the first transparent portion 11 can be locked by adjusting the inner diameter of the clip, so as to assemble the annular housing 10 and the first transparent portion 11.
Optionally, there is one annular snap 70; alternatively, there are a plurality of annular snap members 70, and the plurality of annular snap members 70 are arranged at intervals in the axial direction of the annular housing 10. Like this, the annular joint spare 70's that the aforesaid set up indicates the number is selected more in a flexible way to satisfy different user demand and operating mode, also promoted staff's processing flexibility.
In this embodiment, there are three annular clamping members 70, two annular clamping members 70 are used for locking the first transparent part 11 and the annular housing 10 to assemble the two, and one annular clamping member 70 is sleeved on at least part of the annular housing 10 and at least part of the cover plate 20 to connect the annular housing 10 and the cover plate 20.
It should be noted that the connection manner of the annular housing 10 and the cover plate 20 is not limited to this, and may be adjusted according to the working condition and the use requirement. Optionally, the annular housing 10 and the cover plate 20 are screwed.
As shown in fig. 1 and fig. 2, the hybrid visualization test stand further includes a base 80, a bracket 90, a first guide rail 100, and a first slider 110. Wherein, a support 90 is provided on the base 80, and the support 90 is used for supporting the ring-shaped casing 10. The first guide rail 100 is provided on the base 80 and extends in the height direction of the hybrid visual test stand. The first block 110 is movably disposed on the first rail 100, and the image capturing device 60 is disposed on the first block 110. In this way, the first slider 110 is operated to slide along the first guide rail 100, so as to adjust the capturing height of the image capturing device 60, thereby meeting different use requirements and working conditions.
Specifically, the visualization structure is suspended on the base 80 by the support 90, so that the image capturing device 60 captures the mixed situation. Image acquisition device 60 sets up on first slider 110, and first guide rail 100 extends along the direction of height of mixing visual test platform, and first slider 110 can slide along first guide rail 100, and then adjusts image acquisition device 60's shooting height to ensure that image acquisition device 60 can gather the mixed condition of diesel oil particle and waste gas in the visual structure.
As shown in fig. 1 and 2, the hybrid visualization test stand further includes a second guide rail 120 and a second slider 130. Wherein, the second guide rail 120 is disposed on the base 80 and extends along the length direction or the width direction of the hybrid visual testing stand. The second slider 130 is movably disposed on the second rail 120, and the laser generator 50 is disposed on the second slider 130 and under the first transparent portion 11. In this way, the second slider 130 is operated to slide along the second guide rail 120 to adjust the position of the laser generator 50 to meet different requirements and conditions.
Specifically, the image capture device 60 is bolted to the first slider 110, and the laser generator 50 is bolted to the second slider 130.
In the present embodiment, the second rail 120 extends along the length direction of the hybrid visualization test stand so that the laser generator 50 is slidably disposed along the length direction of the base 80.
Optionally, one second guide rail 120; alternatively, the second guide rail 120 may be provided in plurality, and the plurality of second guide rails 120 may be provided at intervals in the width direction of the base 80. Like this, above-mentioned setting makes the number of second guide rail 120 select more in a flexible way to satisfy different user demand and operating mode, also promoted staff's processing flexibility.
Optionally, the image capture device 60 is a CCD camera.
As shown in fig. 1, the visual testing stand further includes a post-treatment connecting pipe 140, a front pressure stabilizing tank 150, an exhaust flowmeter 160, a rear pressure stabilizing tank 170, an exhaust connecting pipe 180, a motor 190, and a fan 200. The exhaust flowmeter 160 is connected with the front pressure stabilizing box 150 and the rear pressure stabilizing box 170 through a hoop, the exhaust connecting pipe 180 is connected with the fan 200 through a hoop, and the motor 190 is connected with the fan 200 through a coupler.
In the present embodiment, the laser generator 50 forms a sheet-like laser light having a normal direction parallel to the axis of the annular housing 10, and the laser light passes through the first transparent part 11 to illuminate a cross section of a specific location. By moving the positions of the first slider 110 and the second slider 130, the flow field and droplet distribution characteristics at different positions can be measured. The image capture device 60 can observe the flow characteristics in the cross-section at the illuminated location through the second transparent portion.
The application also provides a mixing uniformity detection method, which is suitable for the mixing visual test bed, and the mixing uniformity detection method comprises the following steps:
acquiring an image acquired by an image acquisition device 60 of the hybrid visual test bed;
equally dividing the image into m sectors, and obtaining the standard deviation of the number of diesel particles in each sector
According to standard deviation
Judging the consistency of the number of the diesel particles in each sector;
analyzing the standard deviation of the radial distance of the diesel particles in each sector one by one
And standard deviation of radian
In terms of radial distance standard deviation
Standard deviation of sum radian
And judging whether the diesel particles in each sector are uniformly distributed or not.
Specifically, in the process of mixing the diesel particles and the exhaust gas in the mixing visual test bed, the image acquisition device acquires the mixing condition of the diesel particles and the exhaust gas in the annular shell, equally divides the acquired image into m sectors, and divides the number and the distribution condition of the diesel particles in each sector to obtain the mixing effect of the mixer. Wherein, waste gas passes through feed structure 30 and gets into blender 40, mixes in blender 40 with diesel oil tracer particle, and the oil gas mixture after the mixture passes through the via hole diffusion entering visualization structure of gas outlet cylinder 220. Laser beams emitted by the laser generator 50 form laser sheets to irradiate the visible structure in parallel, diesel oil droplets in any axial section of the visible structure are photographed through the image acquisition device 60, and oil and gas distribution conditions (including distribution characteristics inside and outside the mixer) in any section can be obtained. The images shot by the CCD camera are transmitted to a computer, the velocity field of the fluid is obtained through the processing of a cross-correlation algorithm, and the distribution characteristics of the diesel oil droplet group inside and outside the mixer can be known through observing the images.
In this example, the standard deviation of the number of diesel particles in each sector is obtained
The method comprises the following steps:
according to
Obtaining; wherein, the image has N diesel particles, and the actual number of particles in each sector is
。
In this embodiment, through the distribution condition of diesel oil liquid drop on the inside and the outside different cross-sections of analysis blender, according to the mixed effect of diesel oil liquid drop distribution characteristic and oil gas, can carry out quick lectotype to the blender.
Specifically, a section inside the mixer and any two sections with the same distance in the front and back directions outside the mixer are selected, and the unevenness of the distribution of the liquid droplets on the three sections is comprehensively compared. m is 180, i.e. the circular cross section is equally divided into 180 sectors, and the included angle of each sector is 2 degrees. First, defineThe standard deviation of the number of particles per sector, assuming that the total circular cross-section is N particles, the average number of particles per sector is N/180, assuming that the actual number of particles per sector is N/180
Then, the standard deviation of the number of the diesel particles in each sector can be obtained according to the formula
. Wherein, standard deviation
Between 0 and 1. When in use
When 0, the number of particles is equal for each sector. Definition of
When the particle number distribution is between 0 and 0.1, the particle number distribution is considered to be relatively uniform, and the analysis of the particle distribution position of each sector part can be performed, as shown in FIG. 3,
is composed of
。
In the present embodiment, the radial distance standard deviation
The calculation method comprises the following steps:
(ii) a Wherein the image is circular and has a radius of R, N diesel particles are evenly distributed on the fan-shaped edge of each fan-shaped,
is the radial distance difference between the ith diesel particle and the reference diesel particle close to the fan-shaped edge of the diesel particle.
In this example, standard deviation in radians
The calculation method comprises the following steps:
(ii) a Wherein,
is the included angle between the ith diesel particle and the fan-shaped edge close to the diesel particle.
Specifically, when analyzing the particle distribution position in each sector, it is assumed that the diesel particles are distributed in an array in the axial direction and the radial direction in each sector portion, as shown by black particles in fig. 3 and 5. Assuming that the radius of the circular section is R, N particles are evenly distributed on each fan-shaped edge, and the minimum radial distance and the minimum radian of the particles in each fan-shaped section are evaluated by taking the number 10-17 particles as a reference. The particle in the middle of the sector in fig. 4 is located at the farthest position of the diesel particle from the reference, where the deviation arc is the largest (maximum arc is 1 °). The radial distance is greatest when the diesel particle is at the middle of the two black particles (maximum distance is
As shown by particle number 2 in fig. 4. Characterizing diesel particle distribution uniformity by radial distance and standard deviation of radian
Standard deviation of sum radian
Can be calculated by the formula. Thus, as shown in FIG. 4, the standard deviation of the radial distance of the sectorial fraction diesel particles
Is composed of
Standard deviation in radian
Is composed of
。
In the present embodiment, the standard deviation is used
The method for judging the consistency of the number of the diesel particles in each sector comprises the following steps:
when standard deviation of
When the number of the diesel particles in each sector is zero, judging that the number of the diesel particles in each sector is equal;
when standard deviation of
If the particle size is greater than 0 and less than or equal to 0.1, the number of diesel particles in each sector is judged to be consistent.
In the present embodiment, the standard deviation is based on the radial distance
Standard deviation of sum radian
The method for judging whether the diesel particles in each sector are uniformly distributed comprises the following steps:
according to
To obtain uniformity of an image
Respectively acquiring at least two images at the positions of the rest cross sections of the annular shell 10 of the hybrid visual test bed, and respectively obtaining the uniformity of each image
For a plurality of uniformity
The average value is calculated to obtain the mixing uniformity of the mixing visual test bed
. Wherein, in the mixing uniformity
And when the mixing uniformity is more than 0 and less than or equal to 0.5, judging that the mixing uniformity of the mixing visual test bed is better.
In the present embodiment, three sections are used to obtain the mixing uniformity of the mixer
Uniformity of mixing
The following formula is given:
Wherein,
the value is between 0 and 1 and defined differently
The values correspond to different distribution characteristics, as shown in table 1.
TABLE 1 differences
Value corresponding distribution characteristics
In addition, the distribution characteristics of the diesel droplets in the transverse cross section of the visual structure can be analyzed by interchanging the positions of the laser generator 50 and the camera, and the non-uniformity of the diesel droplet distribution and the velocity information of the droplets in different transverse cross sections can be obtained by using the same analysis method.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the hybrid visualization test stand includes an annular housing having a first transparent portion and a cover plate having a second transparent portion. The light emitting end of the laser generator is arranged corresponding to the first transparent part, and the image acquisition device is arranged corresponding to the second transparent part. Therefore, in the process of mixing the diesel particles and the exhaust gas by the mixing visual test bed, the laser generator emits laser, and the laser penetrates through the first transparent part and then irradiates into the annular shell. The image acquisition device gathers the mixed condition of diesel oil particle and waste gas in the annular housing, and then has solved the problem that the staff can't acquire the inside mixed condition of blender among the prior art to the staff is follow-up detects and judges the mixing homogeneity and the mixed effect of blender.
It is to be understood that the above-described embodiments are only a few, 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, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A mixing uniformity detection method is characterized by being suitable for a mixing visual test bed, and comprises the following steps:
acquiring an image acquired by an image acquisition device (60) of the hybrid visual test bed;
equally dividing the image into m sectors, and obtaining the standard deviation of the number of diesel particles in each sector
According to said standard deviation
Judging the consistency of the number of the diesel particles in each sector;
analyzing the standard deviation of the radial distance of the diesel particles in each sector one by one
And arcStandard deviation of
To be in accordance with the radial distance standard deviation
And the standard deviation of the radian
Judging whether the diesel particles in each sector are uniformly distributed;
the hybrid visual test stand comprises:
a visualization structure comprising an annular housing (10) and a cover plate (20) arranged at one end of the annular housing (10), the annular housing (10) having a first transparent portion (11), the cover plate (20) having a second transparent portion; the annular shell (10) is provided with an arc-shaped opening, and the first transparent part (11) is arc-shaped and is detachably arranged at the arc-shaped opening; the cover plate (20) is detachably connected with the annular shell (10);
a feed structure (30) comprising a gas inlet portion and a liquid inlet portion;
a mixer (40), one end of the mixer (40) is communicated with the gas inlet part and the liquid inlet part, and the other end of the mixer (40) is communicated with the inner cavity of the visualization structure;
the light emitting end of the laser generator (50) is arranged corresponding to the first transparent part (11);
an image acquisition device (60) arranged corresponding to the second transparent part;
a connecting barrel (210), one end of the connecting barrel (210) being connected with the feeding structure (30), the mixer (40) being arranged between the feeding structure (30) and the connecting barrel (210);
the end part of the air outlet cylinder (220) is connected with the other end of the connecting cylinder (210), the air outlet cylinder (220) is positioned in the inner cavity of the visual structure, and the wall of the air outlet cylinder (220) is provided with a plurality of through holes;
the annular clamping piece (70) is sleeved on at least part of the annular shell (10) and at least part of the first transparent part (11) to connect the annular shell (10) and the first transparent part (11); wherein, the annular clamping piece (70) is one; or a plurality of annular clamping pieces (70) are arranged, and the annular clamping pieces (70) are arranged at intervals along the axial direction of the annular shell (10);
a base (80);
a support (90) provided on the base (80), the support (90) being for supporting the annular housing (10);
a first guide rail (100) which is arranged on the base (80) and extends along the height direction of the hybrid visualization test stand;
the first sliding block (110) is movably arranged on the first guide rail (100), and the image acquisition device (60) is arranged on the first sliding block (110);
a second guide rail (120) provided on the base (80) and extending in a length direction or a width direction of the hybrid visualization test stand;
the second sliding block (130) is movably arranged on the second guide rail (120), and the laser generator (50) is arranged on the second sliding block (130) and is positioned below the first transparent part (11).
2. The mixing uniformity detection method of claim 1, wherein the standard deviation of the number of diesel particles in each sector is obtained
The method comprises the following steps:
according to
Obtaining; wherein there are a total of N diesel particles within the image, the actual number of particles in each sectorIs numbered as
。
3. The mixing uniformity detection method of claim 1,
the standard deviation of the radial distance
The calculation method comprises the following steps:
(ii) a Wherein the image is circular and has a radius of R, N diesel particles are evenly distributed on the fan-shaped edge of each fan-shaped,
the distance difference of the ith diesel particle and the reference diesel particle close to the fan-shaped edge of the diesel particle in the radial direction is shown;
standard deviation of said radian
The calculating method comprises the following steps:
(ii) a Wherein,
is the included angle between the ith diesel particle and the fan-shaped edge close to the diesel particle.
4. The mixing uniformity detection method of claim 1, wherein the standard deviation is based on
The method for judging the consistency of the number of the diesel particles in each sector comprises the following steps:
when the standard deviation is
When the number of the diesel particles in each sector is zero, judging that the number of the diesel particles in each sector is equal;
when the standard deviation is
If the particle size is greater than 0 and less than or equal to 0.1, the number of diesel particles in each sector is judged to be consistent.
5. The mixing uniformity detection method of claim 1, wherein the standard deviation is based on the radial distance
And the standard deviation of the radian
The method for judging whether the diesel particles in each sector are uniformly distributed comprises the following steps:
according to
To obtain uniformity of an image
Respectively acquiring at least two images at the positions of the rest sections of the annular shell (10) of the hybrid visual test bed, and respectively obtaining the uniformity of each image
For a plurality of uniformity
Averaging to obtain the mixing uniformity of the mixing visual test bed
(ii) a Wherein the mixing uniformity
And when the mixing uniformity is more than 0 and less than or equal to 0.5, judging that the mixing uniformity of the mixing visual test bed is better.
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| CN114061961A (en) * | 2020-07-31 | 2022-02-18 | 上汽通用汽车有限公司 | Tracer adding and calibrating system for internal combustion engine visual test |
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