CN114923866A - Gas-liquid two-phase flow same-field testing system and processing method based on schlieren and MIE method - Google Patents
Gas-liquid two-phase flow same-field testing system and processing method based on schlieren and MIE method Download PDFInfo
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Abstract
The invention discloses a gas-liquid two-phase flow same-field testing system and a processing method based on schlieren and MIE methods, wherein the system mainly comprises: two concave lens, the light source, two reflectors, two cameras, the edge of a knife, spectroscope and automatic regulating apparatus, wherein, position department sets up two concave lens respectively in presetting of the constant volume bullet left and right sides that awaits measuring, place the spectroscope between constant volume bullet and the left side concave lens that awaits measuring, set up automatic regulating apparatus on the spectroscope, position department sets up two cameras respectively in presetting of spectroscope top and below, constant volume bullet right side oblique top that awaits measuring, set up the light source between the oblique top in second concave lens left side, the left side of constant volume bullet lower extreme that awaits measuring, the right side of upper end sets up two reflectors respectively, set up the edge of a knife between right side camera and near speculum. The system realizes the simultaneous use of schlieren and MIE methods to test the gas-liquid two-phase flow in the same field, ensures that the internal state image of the constant volume bomb at the same moment can be accurately acquired, and ensures the accuracy and efficiency of the acquired image.
Description
Technical Field
The invention relates to the technical field of power energy, in particular to a gas-liquid two-phase flow same-field testing system and a processing method based on schlieren and MIE methods.
Background
In the development process of a new era, the engine occupies an important position in industries, daily life, military and other industries, the development of the society is promoted, and the research aiming at the engine is never stopped. The research on flame combustion, soot emission and a spraying system in the engine plays an important role in improving the thermal efficiency of the engine and reducing the carbon emission. In order to research the overall performance of the engine and simulate the internal operation condition of the engine, the internal part of the engine needs to be visualized to obtain required data.
In the current engine visualization research, the most common means are an MIE scattering method, a schlieren method and a laser induction method, which can meet the requirement of obtaining images in the flame combustion and spray injection process with certain precision. These methods can provide a means of collecting data images that can facilitate engine development and advancement.
In the aspect of engine visualization, the acquisition of images is an important step, and the acquired pictures are the core of the whole experiment. The various methods have respective advantages and disadvantages, for example, the MIE is visual, but the macroscopic flow cannot be shown, and the schlieren method can obtain the air field fluctuation of the whole environment, and can display the macroscopic flow field, but is not visual enough. Therefore, in the internal research of the constant volume bomb, aiming at the defects of each method, the prior art generally needs to adopt a plurality of methods to carry out measurement for a plurality of times respectively, collect a plurality of images, and then use a computer to carry out analysis, comparison, adjustment and the like, but the test method needs to adopt different methods to carry out test respectively, the operation is too complicated, the collected images are not the internal state images of the constant volume bomb at the same time, and the accuracy of the images cannot be guaranteed.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a gas-liquid two-phase flow same-field testing system based on schlieren and MIE methods.
The invention also aims to provide a gas-liquid two-phase flow same-field testing and processing method based on the schlieren and MIE method.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a gas-liquid two-phase flow same-field testing system based on schlieren and MIE methods, including: the device comprises a constant volume bomb to be detected, a first concave lens, a second concave lens, a light source, a first reflector, a second reflector, a first camera, a second camera, a knife edge, a spectroscope, an automatic adjusting device and an upper computer, wherein the first concave lens and the second concave lens are respectively arranged at preset positions on the left side and the right side of the constant volume bomb to be detected, the spectroscope is arranged between the constant volume bomb to be detected and the first concave lens, the automatic adjusting device is arranged on the spectroscope, the first camera and the second camera are respectively arranged at the preset positions above and below the spectroscope, the light source is arranged between the oblique upper right side of the constant volume bomb to be detected and the oblique upper left side of the second concave lens, the first reflector and the second reflector are respectively arranged on the left side and the right side of the lower end of the constant volume bomb to be detected, the knife edge is arranged between the second camera and the first reflector, the upper computer is respectively connected with the first camera, the second camera, the automatic adjusting device and the constant volume bomb to be measured.
In the gas-liquid two-phase flow same-field testing system based on the schlieren and MIE method, in the image acquisition process, in order to ensure the accuracy of the angle of the spectroscope, an automatic adjusting device is arranged below the spectroscope and is regulated and controlled by a computer; meanwhile, the system can be compatible to both gas and liquid conditions, and the gas-liquid two-phase flow same-field test can be guaranteed; the whole system can ensure that two cameras can simultaneously acquire data through the acquisition signals of the computer end, keep synchronization and subsequently collect acquired pictures; compared with the traditional light path, the MIE scattering method and the schlieren method can be simultaneously realized by changing the traditional light path to a certain degree, the images of the internal condition of the constant volume bomb at the same time are collected, the precision and the efficiency of the collected images are ensured, and finally the collected images are processed by a program and compared with the two images, so that the accuracy and the usability of the final result are ensured; in addition, in the whole image acquisition, the operation process inside the constant volume bomb cannot be interfered, the detection outside the cylinder is more convenient, and meanwhile, the collected data are more accurate due to the fact that the experiment is not influenced.
In addition, the gas-liquid two-phase flow on-site test system based on the schlieren and MIE method according to the above embodiment of the invention may also have the following additional technical features:
further, in an embodiment of the present invention, the constant volume bomb to be measured, the light source, the second concave lens, the beam splitter, the second reflective mirror, and the second camera form an MIE scattering test structure.
Further, in an embodiment of the present invention, the volume bomb to be measured, the light source, the first concave lens, the second concave lens, the beam splitter, the first reflector and the second reflector, the knife edge, and the first camera form a schlieren test structure.
Further, in an embodiment of the present invention, the automatic adjusting device is configured to adjust the beam splitter to a position where light can be collected by the first camera and the second camera after passing through the volume bomb to be measured.
In order to achieve the above object, another embodiment of the present invention provides a method for performing a gas-liquid two-phase flow same-field test treatment based on a schlieren and MIE method, comprising the following steps: step S1, turning on the light source to form parallel light, and making the parallel light enter the constant volume bomb to be measured through the second reflecting mirror and the second concave mirror; step S2, adjusting the positions of the spectroscope, the first camera and the second camera by using the automatic adjusting device to make the parallel light passing through the constant volume bomb to be measured halved and captured; step S3, controlling oil injection of an oil injector by using the upper computer, enabling the first camera and the second camera to start shooting at the same time, obtaining a first result image and a second result image of the inside of a constant volume bomb at the same time, and uploading the first result image and the second result image to the upper computer; step S4, respectively measuring two result image data after respectively preprocessing the first result image and the second result image by using the upper computer; step S5, comparing the two result image data to remove the error data in the first and second result images, so as to obtain two optimal images.
According to the gas-liquid two-phase flow same-field testing and processing method based on the schlieren and MIE method, in the image acquisition process, in order to ensure the accuracy of the angle of the spectroscope, an automatic adjusting device is arranged below the spectroscope and is regulated and controlled by a computer; meanwhile, the system can be compatible to both gas and liquid conditions, and the gas-liquid two-phase flow same-field test can be guaranteed; the whole system can ensure that two cameras can simultaneously acquire data through the acquisition signals of the computer end, keep synchronization and subsequently collect acquired pictures; compared with the traditional light path, the method has the advantages that the MIE scattering method and the schlieren method can be simultaneously realized, the images of the internal conditions of the constant volume bomb at the same moment are collected, the precision and the efficiency of the collected images are ensured, and finally the collected images are processed by a program and then compared with each other, so that the accuracy and the usability of the final result are ensured; in addition, in the whole image acquisition, the operation process inside the constant volume bomb cannot be interfered, the detection outside the cylinder is more convenient, and meanwhile, the collected data are more accurate due to the fact that the experiment is not influenced.
In addition, the gas-liquid two-phase flow same-field test processing method based on the schlieren and MIE method according to the above embodiment of the invention may also have the following additional technical features:
further, in an embodiment of the present invention, the step S4 specifically includes: step S401, preprocessing the first result image and the second result image; s402, positioning pixel points and corresponding nozzles of the preprocessed first result image and the preprocessed second result image, and measuring penetration distance and flame cone angle to solve two flame volumes; step S403, respectively solving two flame pixel occupation positions according to pixel points of the two images; and S404, calculating two flame areas according to the two flame volumes and the two flame pixel occupation positions to obtain two result image data.
Further, in one embodiment of the present invention, the preprocessing sequentially grays, reduces noise, cuts, and rotates the first and second result images.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a gas-liquid two-phase flow in-situ test system based on schlieren and MIE methods according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the schlieren principle of one embodiment of the present invention;
FIG. 3 is a Z-shaped optical path diagram of a schlieren method according to one embodiment of the present invention;
FIG. 4 is a flow diagram of data processing for two resulting images according to one embodiment of the present invention;
FIG. 5 is a diagram of results of different processes at the same time in accordance with one embodiment of the present invention;
FIG. 6 is a final experimental result graph, i.e., two optimal images, of an embodiment of the present invention;
FIG. 7 is an overall flow diagram of a gas-liquid two-phase flow in-situ test system based on the schlieren and MIE method of one embodiment of the present invention;
FIG. 8 is a flow chart of a gas-liquid two-phase flow in-situ test processing method based on the schlieren and MIE method in accordance with one embodiment of the present invention.
Description of the reference numerals:
100-a gas-liquid two-phase flow in-situ test system based on a schlieren and MIE method, 1-a constant volume bomb to be tested, 2-a first concave lens, 3-a second concave lens, 4-a light source, 5-a first reflector, 6-a second reflector, 7-a first camera, 8-a second camera, 9-a knife edge, 10-a spectroscope, 11-an automatic adjusting device and 12-an upper computer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The gas-liquid two-phase flow same-field test system and the gas-liquid two-phase flow same-field test method based on the schlieren and MIE methods provided by the embodiment of the invention are described below with reference to the accompanying drawings, and firstly, the gas-liquid two-phase flow same-field test system based on the schlieren and MIE methods provided by the embodiment of the invention is described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a gas-liquid two-phase flow on-site test system based on schlieren and MIE methods according to an embodiment of the invention.
As shown in fig. 1, the striae and MIE method based gas-liquid two-phase flow in-situ test system 100 includes: the constant volume bomb to be measured comprises a constant volume bomb 1 to be measured, a first concave lens 2, a second concave lens 3, a light source 4, a first reflective mirror 5, a second reflective mirror 6, a first camera 7, a second camera 8, a knife edge 9, a spectroscope 10, an automatic adjusting device 11 and an upper computer 12.
The constant volume bomb to be measured comprises a first concave lens 2 and a second concave lens 3, a spectroscope 10 is arranged between the constant volume bomb to be measured 1 and the first concave lens 2, an automatic adjusting device 11 is arranged on the spectroscope 10, a first camera 7 and a second camera 8 are arranged at the preset positions above and below the spectroscope 10, a light source 4 is arranged between the oblique upper portion of the right side of the constant volume bomb to be measured 1 and the oblique upper portion of the left side of the second concave lens 3, a first reflective mirror 5 and a second reflective mirror 6 are arranged on the left side of the lower end and the right side of the upper end of the constant volume bomb to be measured 1 respectively, a knife edge 9 is arranged between the second camera 8 and the first reflective mirror, and an upper computer 12 is connected with the first camera 7, the second camera 8, the automatic adjusting device 11 and the constant volume bomb to be measured 1 respectively.
Further, in an embodiment of the present invention, the constant volume bomb to be measured 1, the light source 4, the second concave lens 3, the spectroscope 10, the second reflective mirror 6 and the second camera 8 constitute an MIE scattering test structure.
It should be noted that the MIE scattering principle means that when the diameter of the particles suspended in the space is close to or equal to the wavelength of the incident light, the suspended particles can scatter the incident light, and the scattered light intensity is independent of the wavelength of the incident light, so the MIE scattering technology can be widely applied to the visual measurement of the fuel spray characteristics of the internal combustion engine. The MIE scattering method is divided into a white light MIE scattering method and a laser MIE scattering method according to different incident light sources, the white light MIE scattering method takes a full-waveband LED lamp and the like as light sources, and when cold state spraying characteristic research is carried out, the wavelength range which can be reflected by the full-waveband LED lamp is wide, and the spectrum receiving range of a high-speed camera can be completely covered.
According to the embodiment of the invention, a test structure of an MIE scattering method is constructed by adopting a most basic MIE scattering technology to directly observe the characteristics of flame combustion performance, structure and the like, and data, namely a first result image, in the flame combustion process of the constant volume bomb 1 to be measured is obtained clearly according to the imaging principle.
The main formula of the MIE scattering method is as follows:
wherein alpha is a dimensionless particle size parameter, m 1 The refractive index of the dispersion medium surrounding the particles, d the diameter of the particles, f the frequency of light, and c the speed of light.
Further, in an embodiment of the present invention, the volume bomb to be measured 1, the light source 4, the first concave lens 2, the second concave lens 3, the beam splitter 10, the first reflective mirror 5, the second reflective mirror 6, the knife edge 9, and the first camera 7 form a schlieren test structure.
It should be noted that, the schlieren method uses the principle that a light beam is deflected due to the change of the refractive index when the light beam passes through a flow field with variable density, and the deflected light is converged and properly shielded by using a 'knife edge' device, so that a real image with variable brightness can be formed after the light beam is diffused. The light and dark regions of the image represent the density variations of the flow field. In the image formed by the parallel light schlieren method, the brightness degree is the first derivative of the refractive index (related to the density) in the flow field of the test area. Schlieren is commonly used to study the flow of gases or liquids.
As shown in fig. 2, the light source S is a point light source and is placed at the focal point of the convex lens L1, and the light emitted from the light source is converted into parallel light beams by the lens and passes through the medium of the test section.
If there is a density gradient change in the test section medium a, the refractive index will change, and the incident light passing through point a will be deflected (as shown by the dashed line) in the test section. This will cause part of the light originally blocked by the optical knife to be able to reach the viewing screen due to deflection, or the light not originally blocked is blocked by the optical knife due to deflection, which will cause the illumination of the corresponding imaging position to rise or fall, and the viewing screen will form an image with uneven brightness along with the density change, i.e. schlieren effect.
As shown in fig. 3, in the embodiment of the present invention, in order to improve the precision of the schlieren method, the schlieren method with the Z-shaped optical path is selected to test the constant volume bomb 1 to be measured, so as to acquire the second result image inside the constant volume bomb.
Further, in an embodiment of the present invention, the automatic adjusting device 11 is used to adjust the beam splitter 10 to a position where the light can be collected by the first camera 7 and the second camera 8 after passing through the constant volume bomb 1 to be measured.
In order to ensure the correctness of light transmission, the embodiment of the invention installs the automatic adjusting device 11 under the spectroscope 10 corresponding to the device, so as to ensure that the light of the spectroscope 10 can meet the camera receiving setting.
Specifically, in the embodiment of the invention, before the MIE scattering method and the schlieren method are adopted, the light path of the MIE scattering method and the light path of the schlieren method are improved, the spectroscope 10 is adjusted to the position where light can be simultaneously collected by the first camera 7 and the second camera 8 after passing through the constant volume bomb 1 to be measured by the automatic adjusting device 11, namely, the upper computer 12 adjusts the automatic adjusting device 11 to enable the light passing through the spectroscope 10 to be halved, and the first camera 7 and the second camera 8 simultaneously collect the internal images of the constant volume bomb 1 to be measured, namely, the first result image and the second result image.
Further, after the first result image and the second result image are acquired, the first result image and the second result image are uploaded to the upper computer 12, as shown in fig. 4, a preset image processing module in the upper computer 12 is used for graying, denoising, cutting and rotating the first result image and the second result image, namely, the interference elements are corrected to a certain extent, then marginalization is performed, data acquisition is performed on the marginalized images, the data acquisition process is mainly performed on the pixel point positions of the images, corresponding nozzles are positioned, the penetration distance is measured, and program compiling is performed according to the definition of the penetration distance and the definition of the flame cone angle, so that relevant data can be accurately measured. Meanwhile, the flame is subjected to tapering treatment, so that the volume of the flame at the treatment position is convenient to treat. In the aspect of flame area, the positions occupied by the flame pixels are read, and the area of the pixel points is calculated, so that the flame area values in the two result images are further calculated by superposition to serve as two result image data, as shown in fig. 5. Finally, the images acquired by the schlieren method contain flame burning data and corresponding gas field data, while the images acquired by the MIE scattering method can only acquire flame burning data within the visible light range, so that the data under the measurement results of the two different methods are compared by adopting a comparison method, the usability of the data is ensured, unnecessary data are removed, relevant data are reserved, and two optimal images are acquired, as shown in fig. 6.
Therefore, the work flow of the gas-liquid two-phase flow on-site test system based on the schlieren and MIE method provided by the embodiment of the invention is as follows:
it can be understood that, as shown in fig. 1, as can be seen from the structural diagram, light rays of pictures acquired by the two cameras are all split from one light ray by the spectroscope 10, so that the whole light path can shoot images of a liquid phase and a gas phase simultaneously in shooting, and the whole light path ensures that the light rays under the MIE scattering method and the light rays under the schlieren method are the same light rays, thereby ensuring the synchronism of the two cameras and ensuring the consistency of the pictures acquired by different methods. The light rays are processed through the spectroscope 10 in the whole structure, so that the visible light waves are ensured, the halving of the light rays is met, the brightness of the picture is ensured, the synchronous control system in the structure ensures that the shooting of the camera is started while the oil is sprayed, and the required picture can be shot;
therefore, as shown in fig. 7, the light source 4 is turned on first, so that the light source 4 is connected into the whole system to form parallel light, and light rays of the system can be ensured to pass through the constant volume bomb 1 to be tested, so that an internal image is taken out to enable the most basic test to be carried out;
then, the upper computer 12 is used for controlling the automatic adjusting device 11 to adjust the positions of the spectroscope 10 and the two cameras so as to ensure that the light can be captured and processed by the cameras after the light carries out information through the constant volume missile.
After the positions of the relevant devices are adjusted, the upper computer 12 sends out synchronous control signals to control the oil sprayer to spray oil and simultaneously enable the two cameras to start shooting, and after the cameras shoot images, the images are transmitted to the upper computer 12, so that the storage and the subsequent processing are convenient.
And (3) processing the obtained related result data through the flow of fig. 4 to finally obtain the effect of fig. 5, finishing the measurement of flame penetration distance, cone angle, volume and area, and providing reference for flame combustion research. Meanwhile, data under the measurement results of the two different methods can be compared, so that the usability of the data is ensured, unnecessary data is removed, and related data is reserved.
As shown in fig. 6, two optimal images are shown as one effect diagram presented by the experiment, and it can be seen that the embodiment of the present invention can ensure the accuracy of the same-field test of the gas-liquid two-phase flow, and has a good effect. At the flame position, the flame information can be shot by the MIE scattering method and the schlieren method at the same time, the images of the flame information and the schlieren method are processed, the obtained data are more accurate, and the method has certain comparative significance.
According to the gas-liquid two-phase flow on-field test system based on the schlieren and MIE method, in the image acquisition process, in order to ensure the accuracy of the angle of the spectroscope, an automatic adjusting device is arranged below the spectroscope and is regulated and controlled by a computer end; meanwhile, the system can be compatible to gas and liquid conditions, and the gas-liquid two-phase flow same-field test can be realized; the whole system can ensure that two cameras can simultaneously acquire data through the acquisition signals of the computer end, keep synchronization and subsequently collect acquired pictures; compared with the traditional light path, the method has the advantages that the MIE scattering method and the schlieren method can be simultaneously realized, the images of the internal conditions of the constant volume bomb at the same moment are collected, the precision and the efficiency of the collected images are ensured, and finally the collected images are processed by a program and then compared with each other, so that the accuracy and the usability of the final result are ensured; in addition, in the whole image acquisition, the operation process inside the constant volume bomb cannot be interfered, the detection outside the cylinder is more convenient, and meanwhile, the collected data is more accurate due to the fact that the experiment is not influenced.
The gas-liquid two-phase flow same-field test treatment method based on the schlieren and MIE methods, which is provided by the embodiment of the invention, is described next with reference to the attached drawings.
FIG. 8 is a flow chart of a gas-liquid two-phase flow in-field test treatment method based on the schlieren and MIE methods of one embodiment of the present invention.
As shown in fig. 8, the gas-liquid two-phase flow same-field test processing method based on the schlieren and MIE method comprises the following steps:
in step S1, the light source 4 is turned on to form parallel light, and the parallel light is incident on the constant volume bomb 1 to be measured through the second reflecting mirror and the second concave mirror.
In step S2, the positions of the spectroscope 10, the first camera 7, and the second camera 8 are adjusted by the automatic adjustment device 11 so that the parallel light passing through the constant volume bomb 1 to be measured is halved and captured.
In step S3, the upper computer 12 controls the injector to inject oil, and the first camera 7 and the second camera 8 start shooting at the same time, so as to obtain a first result image and a second result image inside the constant volume bomb at the same time, and upload the first result image and the second result image to the upper computer 12.
In step S4, the upper computer 12 pre-processes the first result image and the second result image, and measures two result image data.
Further, in an embodiment of the present invention, step S4 specifically includes:
step S401, preprocessing a first result image and a second result image;
s402, positioning pixel points and corresponding nozzles of the preprocessed first result image and the preprocessed second result image, and measuring penetration distance and flame cone angle to solve two flame volumes;
step S403, respectively solving two flame pixel occupation positions according to pixel points of the two images;
in step S404, two flame areas are calculated from the two flame volumes and the two flame pixel occupation positions as two result image data.
Further, in one embodiment of the present invention, the first result image and the second result image are grayed, denoised, cropped, and rotated in sequence in the preprocessing.
In step S5, a comparison is performed based on the two resultant image data to remove error data in the first resultant image and the second resultant image, resulting in two optimal images.
It should be noted that the explanation of the embodiment of the gas-liquid two-phase flow in-field test system based on the schlieren and MIE methods is also applicable to the gas-liquid two-phase flow in-field test processing method based on the schlieren and MIE methods in this embodiment, and details are not repeated here.
According to the gas-liquid two-phase flow on-field test processing method based on the schlieren and MIE method, in the image acquisition process, in order to ensure the accuracy of the angle of the spectroscope, an automatic adjusting device is arranged below the spectroscope and is regulated and controlled by a computer end; meanwhile, the system can be compatible to both gas and liquid conditions, and the gas-liquid two-phase flow same-field test can be guaranteed; the whole system can ensure that two cameras can simultaneously acquire data through the acquisition signals of the computer end, keep synchronization and subsequently collect acquired pictures; compared with the traditional light path, the method has the advantages that the MIE scattering method and the schlieren method can be simultaneously realized, the images of the internal conditions of the constant volume bomb at the same moment are collected, the precision and the efficiency of the collected images are ensured, and finally the collected images are processed by a program and then compared with each other, so that the accuracy and the usability of the final result are ensured; in addition, in the whole image acquisition, the operation process inside the constant volume bomb cannot be interfered, the detection outside the cylinder is more convenient, and meanwhile, the collected data is more accurate due to the fact that the experiment is not influenced.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A gas-liquid two-phase flow same-field test system based on schlieren and MIE method is characterized by comprising: a constant volume bomb to be measured, a first concave lens, a second concave lens, a light source, a first reflector, a second reflector, a first camera, a second camera, a knife edge, a spectroscope, an automatic adjusting device and an upper computer,
the constant volume bullet left and right sides of awaiting measuring predetermines position department and sets up respectively first concave lens with the second concave lens, the constant volume bullet of awaiting measuring with place between the first concave lens the spectroscope, set up on the spectroscope automatic regulating apparatus, spectroscope top and below are predetermine position department and are set up respectively first camera with the second camera, the constant volume bullet right side oblique top of awaiting measuring set up between the oblique top in second concave lens left side the light source, the left side of constant volume bullet lower extreme of awaiting measuring, the right side of upper end set up respectively first reflector with the second reflector, the second camera with set up the edge of a knife between the first reflector, the host computer respectively with first camera, the second camera automatic regulating apparatus the constant volume bullet of awaiting measuring is connected.
2. The striae and MIE method-based gas-liquid two-phase flow on-field test system according to claim 1, wherein the constant volume bomb to be tested, the light source, the second concave lens, the spectroscope, the second reflector and the second camera form an MIE scattering test structure.
3. The striae and MIE method-based gas-liquid two-phase flow in-field test system of claim 1, wherein the volume bomb to be tested, the light source, the first concave lens, the second concave lens, the beam splitter, the first reflector, the second reflector, the knife edge and the first camera form a striae test structure.
4. The striae and MIE method-based gas-liquid two-phase flow on-field test system according to claim 1, wherein the automatic adjustment device is configured to adjust the spectroscope to a position where light rays can be simultaneously collected by the first camera and the second camera after passing through the constant volume bomb to be tested.
5. A gas-liquid two-phase flow same-field testing and processing method based on schlieren and MIE methods is characterized in that the gas-liquid two-phase flow same-field testing system based on claims 1-4 comprises the following steps:
step S1, turning on the light source to form parallel light, and making the parallel light enter the constant volume bomb to be measured through the second reflecting mirror and the second concave mirror;
step S2, adjusting the positions of the spectroscope, the first camera and the second camera by using the automatic adjusting device to enable the parallel light passing through the constant volume bomb to be measured to be halved and captured;
step S3, controlling oil injection of an oil injector by using the upper computer, enabling the first camera and the second camera to start shooting at the same time, obtaining a first result image and a second result image of the inside of a constant volume bomb at the same time, and uploading the first result image and the second result image to the upper computer;
step S4, respectively measuring two result image data after respectively preprocessing the first result image and the second result image by using the upper computer;
step S5, comparing the two result image data to remove error data in the first result image and the second result image, so as to obtain two optimal images.
6. The striae and MIE method based gas-liquid two-phase flow field test processing method of claim 5, wherein the step S4 specifically comprises:
step S401, preprocessing the first result image and the second result image;
s402, positioning pixel points and corresponding nozzles of the preprocessed first result image and the preprocessed second result image, and measuring penetration distance and flame cone angle to solve two flame volumes;
step S403, respectively solving two flame pixel occupation positions according to pixel points of the two images;
and S404, calculating two flame areas according to the two flame volumes and the two flame pixel occupation positions to obtain two result image data.
7. The striae and MIE method based gas-liquid two-phase flow in-field test processing method of claim 6, wherein the preprocessing comprises graying, denoising, cutting and rotating the first and second result images in sequence.
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