Flow field visualization observation method and device based on infrared spectrum absorption characteristics

Abstract

The invention relates to a flow field visualization observation method and device based on the infrared spectrum absorption characteristic, and the method comprises the steps: collecting the temperature data of a high-temperature background solid wall surface based on the infrared spectrum absorption characteristic of Freon; the temperature distribution condition of the high-temperature background solid wall surface is counted according to the temperature data, and the distribution condition of Freon is analyzed according to the temperature distribution condition; and obtaining a Freon and air mixing state according to the distribution condition of the Freon, obtaining a visual flow field of the Freon and air mixing process according to the mixing state, and performing visual display according to the visual flow field. Therefore, the problems that the original flow state of the flow field may be affected by adding the tracer particles in the related technology, system errors are caused, the complexity of an experimental device is high, and the experimental cost is high are solved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid flow field observation and analysis, and in particular to a flow field visualization observation method and device based on infrared spectral absorption characteristics. Background Art

[0002] In the future, the temperature before the turbine of aero-engines will be further increased. Improving the active thermal protection capability of materials and optimizing the active cooling design are of great significance for increasing the temperature before the turbine and improving engine performance. The main active cooling solution is air film or sweating cooling. Understanding the influence of the geometric structure of the hot end components and the parameters of the mainstream and secondary flow fields on the mixing and heat exchange process of hot and cold airflows on the surface of the material is the only way to guide the active cooling thermal design. Understanding the laws of the mixing process mainly relies on flow field visualization methods. It can be said that flow field visualization observation is of great significance for understanding the airflow mixing process and the evolution of the vortex system, and then guiding the design of air film or sweating pores and improving the cooling characteristics of hot end components and the overall performance of the engine.

[0003] Among the related technologies, the existing flow field visualization technology is mainly tracer particle imaging technology (PIV), which injects tiny particles into the fluid. Due to their small geometric size and mass, the particles move with the movement of the fluid. Then, researchers can infer the change process of the flow field by observing the flow of particles. PIV technology has the significant advantages of high flow field display accuracy and obvious visualization effect.

[0004] However, the relevant technology has the following disadvantages: 1. The selection of tracer particles is very important. The volume and weight of the tracer particles cannot be ignored. The addition of tracer particles may affect the original flow state of the flow field and cause system errors. 2. The cost of this technology is too high. It is generally difficult for scientific research institutions to configure PIV-related equipment and bear the high costs during the experiment. Summary of the invention

[0005] The present application provides a flow field visualization observation method and device based on infrared spectral absorption characteristics to solve the problems that the addition of tracer particles in related technologies may affect the original flow state of the flow field, causing system errors, and the complexity of the experimental device and high experimental costs.

[0006] The first aspect of the present application provides a flow field visualization observation method based on infrared spectral absorption characteristics, comprising the following steps: based on the infrared spectral absorption characteristics of Freon, collecting temperature data of a high-temperature background solid wall; statistically analyzing the temperature distribution of the high-temperature background solid wall based on the temperature data, and analyzing the distribution of the Freon based on the temperature distribution; obtaining a mixing state of the Freon and air based on the distribution of the Freon, and obtaining a visualized flow field of the mixing process of the Freon and the air based on the mixing state, and performing a visual display based on the visualized flow field.

[0007] Optionally, in one embodiment of the present application, the visual display based on the visualized flow field includes: controlling the high-temperature background solid wall to meet preset temperature conditions, and obtaining an infrared thermal imaging photograph that meets preset brightness and contrast conditions; using the infrared thermal imager's filter transparent film to adjust the infrared transmittance band of the infrared thermal imager to obtain an adjusted thermal imager detection band; making the adjusted thermal imager detection transmittance band reach the target contrast of the visualized flow field, and under the target contrast, visually displaying the visualized flow field according to the infrared thermal imaging photograph that meets the preset brightness and contrast conditions.

[0008] Optionally, in one embodiment of the present application, the calculation formula of the infrared spectrum radiation force on the high temperature background solid wall is:

[0009]

[0010] Wherein, c1 and c2 are related constants, λ is the infrared emission energy band of the high temperature background solid wall, and T is the temperature of the high temperature background solid wall;

[0011] The calculation formula of the energy of the high temperature background solid wall in the infrared transmission band is:

[0012]

[0013] Wherein, c1 and c2 are the related constants, λ is the infrared emission energy band of the high temperature background solid wall, T is the temperature of the high temperature background solid wall, and dλ is the differential of the wavelength;

[0014] The calculation formula of the infrared spectrum radiation power in the detection band of the thermal imager after adjustment is:

[0015]

[0016] Among them, c1 and c2 are the related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength.

[0017] Optionally, in one embodiment of the present application, the visual display based on the visualized flow field also includes: processing the image data collected by the infrared thermal imager according to the shooting parameters of the infrared thermal imager, and reconstructing the image data to obtain a visualized flow field image that meets preset clarity conditions and preset resolution conditions, and visually displaying the visualized flow field based on the visualized flow field image.

[0018] Optionally, in one embodiment of the present application, the temperature distribution of the high-temperature background solid wall is counted according to the temperature data, and the distribution of the Freon is analyzed according to the temperature distribution, including: judging whether the air exists between the infrared thermal imager and the high-temperature background solid wall; if the air exists between the infrared thermal imager and the high-temperature background solid wall, obtaining the temperature distribution of the high-temperature background solid wall according to the infrared emissivity of the solid wall; if the Freon exists in the air, counting the temperature distribution of the high-temperature background solid wall according to the temperature data, and analyzing the distribution of the Freon according to the temperature distribution.

[0019] The second aspect of the present application provides a flow field visualization observation device based on infrared spectral absorption characteristics, including: an acquisition module, which is used to collect temperature data of a high-temperature background solid wall based on the infrared spectral absorption characteristics of Freon; an analysis module, which is used to statistically calculate the temperature distribution of the high-temperature background solid wall according to the temperature data, and analyze the distribution of the Freon according to the temperature distribution; a visualization module, which is used to obtain a mixing state of the Freon and air according to the distribution of the Freon, and obtain a visualized flow field of the mixing process of the Freon and the air according to the mixing state, and perform a visual display based on the visualized flow field.

[0020] Optionally, in one embodiment of the present application, the visualization module includes: a control unit, used to control the high-temperature background solid wall to meet a preset temperature condition, and obtain an infrared thermal imaging photograph that meets preset brightness and contrast conditions; an adjustment unit, used to adjust the infrared transmittance band of the infrared thermal imager using a filter transparent film of the infrared thermal imager, and obtain an adjusted thermal imager detection band; a first visualization unit, used to make the adjusted thermal imager detection transmittance band reach the target contrast of the visualized flow field, and under the target contrast, visualize the visualized flow field according to the infrared thermal imaging photograph that meets the preset brightness and contrast conditions.

[0021] Optionally, in one embodiment of the present application, the calculation formula of the infrared spectrum radiation force on the high temperature background solid wall is:

[0022]

[0023] Wherein, c1 and c2 are related constants, λ is the infrared emission energy band of the high temperature background solid wall, and T is the temperature of the high temperature background solid wall;

[0024] The calculation formula of the energy of the high temperature background solid wall in the infrared transmission band is:

[0025]

[0026] Wherein, c1 and c2 are the related constants, λ is the infrared emission energy band of the high temperature background solid wall, T is the temperature of the high temperature background solid wall, and dλ is the differential of the wavelength;

[0027] The calculation formula of the infrared spectrum radiation power in the detection band of the thermal imager after adjustment is:

[0028]

[0029] Among them, c1 and c2 are the related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength.

[0030] Optionally, in one embodiment of the present application, the visualization module also includes: a second visualization unit, used to process the image data collected by the infrared thermal imager according to the shooting parameters of the infrared thermal imager, and reconstruct the image data to obtain a visualized flow field image that meets preset clarity conditions and preset resolution conditions, and visualize the visualized flow field based on the visualized flow field image.

[0031] Optionally, in one embodiment of the present application, the analysis module includes: a judgment unit, used to judge whether the air exists between the infrared thermal imager and the high-temperature background solid wall; an acquisition unit, used to obtain the temperature distribution of the high-temperature background solid wall according to the infrared emissivity of the solid wall when the air exists between the infrared thermal imager and the high-temperature background solid wall; an analysis unit, used to count the temperature distribution of the high-temperature background solid wall according to the temperature data when the Freon exists in the air, and analyze the distribution of the Freon according to the temperature distribution.

[0032] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the flow field visualization observation method based on infrared spectral absorption characteristics as described in the above embodiment.

[0033] The fourth aspect of the present application provides a computer-readable storage medium, which stores a computer program. When the program is executed by a processor, it implements the above-mentioned flow field visualization observation method based on infrared spectral absorption characteristics.

[0034] The fifth aspect of the present application provides a computer program product, which stores a computer program that, when executed by a processor, implements the above-mentioned flow field visualization observation method based on infrared spectral absorption characteristics.

[0035] The embodiment of the present application can use Freon as a mixing fluid, and obtain a visualized flow field of the Freon and air mixing process according to the mixing state. By increasing the temperature of the high-temperature background solid wall and installing a filter light-transmitting film to improve the contrast of the visualized flow field, the visualization accuracy and resolution of the flow field are ensured, and the cost is low and the operation is simple, without adding other light sources or tracer particles. Thus, the problem that the addition of tracer particles in the related technology may affect the original flow state of the flow field, causing system errors, the complexity of the experimental device and the high experimental cost are solved.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 A flow chart of a flow field visualization observation method based on infrared spectrum absorption characteristics provided according to an embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the principle of a flow field visualization observation method based on infrared spectrum absorption characteristics according to one embodiment of the present application;

[0040] Figure 3 A graph showing the relationship between infrared spectrum emission power and wavelength of a flow field visualization observation method based on infrared spectrum absorption characteristics according to an embodiment of the present application;

[0041] Figure 4 A graph showing the relationship between the absorption proportionality coefficient and the temperature at different temperatures according to a flow field visualization observation method based on infrared spectrum absorption characteristics according to an embodiment of the present application;

[0042] Figure 5 A schematic diagram of the structure of a flow field visualization observation device based on infrared spectrum absorption characteristics provided according to an embodiment of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0045] The following describes the flow field visualization observation method and device based on the infrared spectrum absorption characteristics of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the addition of tracer particles in the related technology mentioned in the above background technology may affect the original flow state of the flow field, causing system errors, the complexity of the experimental device and the high experimental cost, the present application provides a flow field visualization observation method based on the infrared spectrum absorption characteristics. In this method, Freon can be used as a mixing fluid, and a visualized flow field of the Freon and air mixing process is obtained according to the mixing state. By increasing the temperature of the high-temperature background solid wall and installing a filtering light-transmitting film to improve the contrast of the visualized flow field, the accuracy and resolution of the flow field visualization are ensured, the cost is low, and the operation is simple, and there is no need to add other light sources or tracer particles. Therefore, the problem that the addition of tracer particles in the related technology may affect the original flow state of the flow field, causing system errors, the complexity of the experimental device and the high experimental cost is solved.

[0046] Specifically, Figure 1 A flow chart of a flow field visualization observation method based on infrared spectral absorption characteristics provided in an embodiment of the present application.

[0047] like Figure 1 As shown, the flow field visualization observation method based on infrared spectrum absorption characteristics includes the following steps:

[0048] In step S101, based on the infrared spectrum absorption characteristics of Freon, the temperature data of the high-temperature background solid wall is collected.

[0049] It can be understood that the embodiment of the present application uses gaseous Freon (R134a, etc.) as the secondary flow cooling medium, and the mainstream thermal fluid uses hot air.

[0050] In the actual implementation process, the gas Freon R134a in the embodiment of the present application has a strong absorption peak in the infrared band of 8-8.5 microns. When the infrared light passes through the Freon gas, its infrared energy will be absorbed in large quantities. In this band, the air is fully transparent to the energy of the infrared light, and the infrared light energy can completely pass through the air. Based on the infrared spectrum absorption characteristics of Freon, the embodiment of the present application can use an infrared thermal imager to shoot and collect the temperature of the high-temperature background solid wall to obtain the temperature data of the high-temperature background solid wall.

[0051] The embodiment of the present application can use Freon as a mixing fluid (or a mixing tracer fluid), combine it with an infrared thermal imager to observe the flow field, and use the infrared absorption characteristics of Freon to visualize the flow field, thereby ensuring the accuracy and resolution of flow field visualization while reducing the complexity of the experimental device and the experimental cost.

[0052] In step S102, the temperature distribution of the high-temperature background solid wall is statistically analyzed based on the temperature data, and the distribution of Freon is analyzed based on the temperature distribution.

[0053] As a possible implementation method, the embodiment of the present application can count the temperature distribution of the high-temperature background solid wall based on the temperature data of the high-temperature background solid wall, and reflect the distribution of Freon based on the temperature distribution, wherein the distribution of Freon is reflected as the projection of the location of the Freon gas on the photographed wall.

[0054] The embodiment of the present application can count the temperature distribution of the high-temperature background solid wall, reflect the distribution of Freon, and provide support for the subsequent visualization of the flow field of the Freon and air mixing process.

[0055] Optionally, in one embodiment of the present application, the temperature distribution of the high-temperature background solid wall is statistically calculated based on temperature data, and the distribution of Freon is analyzed based on the temperature distribution, including: judging whether there is air between the infrared thermal imager and the high-temperature background solid wall; if there is air between the infrared thermal imager and the high-temperature background solid wall, obtaining the temperature distribution of the high-temperature background solid wall based on the infrared emissivity of the solid wall; if there is Freon in the air, calculating the temperature distribution of the high-temperature background solid wall based on the temperature data, and analyzing the distribution of Freon based on the temperature distribution.

[0056] It is understandable that the infrared thermal imager in the embodiment of the present application senses the radiation energy and then calculates the temperature. If the radiation energy decreases due to the absorption of Freon, the radiation energy sensed by the thermal imager will decrease, resulting in a lower temperature measurement.

[0057] During the actual implementation process, the embodiment of the present application can determine whether there is completely air between the infrared thermal imager and the high-temperature background solid wall. If there is only air between the infrared thermal imager and the high-temperature background solid wall, then after correctly setting the infrared emissivity of the solid wall, the wall temperature field distribution can be accurately obtained. If there is also Freon fluid in the air, the temperature distribution will change when shooting the same high-temperature background plate at the same temperature. The infrared absorption characteristics of Freon will cause the temperature of the photographed wall to drop. The temperature distribution of the high-temperature background solid wall can be statistically analyzed based on the temperature data, and the distribution of Freon can be analyzed based on the temperature distribution.

[0058] In step S103, the mixing state of Freon and air is obtained according to the distribution of Freon, and the visualized flow field of the Freon and air mixing process is obtained according to the mixing state, and the visualized flow field is visualized.

[0059] During the actual implementation process, the embodiment of the present application can obtain the mixing state of Freon and air according to the distribution of Freon, and finally obtain a visualized flow field of the Freon and air mixing process according to the mixing state, and perform a visual display based on the visualized flow field to enhance and strengthen the visualization effect, wherein the parameters for improving the visualization observation effect include flow field observation contrast, clarity and resolution.

[0060] The embodiments of the present application can be used to study the flow field visualization problem of the mixed flow of mainstream and secondary flows during the active cooling of the air film and sweating of the hot end components of aircraft engines. While ensuring the accuracy and resolution of the flow field visualization, the complexity of the experimental equipment and the experimental cost are greatly reduced.

[0061] Optionally, in one embodiment of the present application, a visual display is performed based on a visualized flow field, including: controlling the high-temperature background solid wall to meet preset temperature conditions, and obtaining an infrared thermal imaging photograph that meets preset brightness and contrast conditions; adjusting the infrared transmittance band of the infrared thermal imager using a filter transparent film of the infrared thermal imager to obtain an adjusted thermal imager detection band; making the adjusted thermal imager detection transmittance band reach the target contrast of the visualized flow field, and under the target contrast, visually displaying the visualized flow field based on the infrared thermal imaging photograph that meets the preset brightness and contrast conditions.

[0062] Among them, the preset temperature condition in the embodiment of the present application can be a condition for increasing the temperature of the high-temperature background solid wall to meet the requirements; the preset brightness and contrast conditions can be a condition for increasing the brightness and contrast of the infrared thermal imaging photo to meet the requirements.

[0063] It can be understood that the embodiment of the present application relies on the temperature change of the solid background to obtain the distribution of the Freon fluid, and then obtain the flow field visualization result. Therefore, increasing the solid background temperature as much as possible is the key to improving the brightness and contrast of infrared photos, because the infrared photos of the locations where there is only air are brighter and the infrared photos of the locations where Freon exists are darker, and the higher the Freon concentration, the darker the photo.

[0064] However, unlimited increase in background temperature will also lead to negative effects. For example, if the background is in contact with the mainstream hot air, the high temperature of the background solid will cause the temperature of the mainstream flow gas to rise, which will seriously affect the flow field, and unlimited temperature increase has limited effect on improving contrast. Therefore, in the actual implementation process, in order to achieve the purpose of increasing the background temperature while ensuring that the background solid wall does not affect the flow field temperature distribution of the mainstream hot air, the embodiment of the present application can be based on an infrared glass window set between the high-temperature background solid wall and the hot fluid pipeline, and the background solid can be photographed through high-transmittance infrared glass to prevent the wall temperature from affecting the mainstream hot air temperature. Figure 2 The embodiment of the present application can control the high-temperature background solid wall to meet certain temperature conditions through electric heating and other schemes to improve the brightness and contrast of infrared photos, and obtain infrared thermal imaging photos that meet the contrast requirements of the visualized flow field.

[0065] Furthermore, the embodiment of the present application can utilize the filter transparent film of the infrared thermal imager to adjust the transmittance band of the infrared thermal imager, and change the transmittance band of the lens of the thermal imager from 7-14 microns to 7.5-9 microns (slightly larger than the absorption peak of Freon) to obtain an adjusted transmittance band, and improve the target contrast of the visualized flow field according to the adjusted transmittance band, and under the target contrast, visualize the visualized flow field according to the infrared thermal imaging photos with improved brightness and contrast, to ensure that better flow field visualization results are obtained through the contrast enhancement effect.

[0066] Specifically, the transmittance band of the infrared thermal imager lens is 7-14 microns, while the absorption peak band of Freon is 8-8.5 microns. The transmittance band of the thermal imager lens must completely include the absorption band of Freon. However, if the thermal imager band is much larger than the Freon absorption band, the total proportion of energy absorbed by Freon to the energy received by the thermal imager will decrease (that is, the proportion of infrared energy absorbed by Freon to the total infrared emission energy will decrease due to the presence of Freon), resulting in a decrease in the contrast of the imaging result. Therefore, the best way to improve the contrast is to change the transmittance band of the thermal imager lens from 7-14 microns to 7.5-9 microns (slightly larger than the Freon absorption peak), which can greatly improve the imaging contrast (in the 7.5-9 micron band, because the infrared emission energy of the high-temperature wall surface is basically absorbed by Freon, the observed temperature will be very low). The purpose of changing the receiving band of the thermal imager can be achieved by installing a filter transparent film with a specific band of 7.5-9 microns in front of the lens.

[0067] The embodiment of the present application can increase the background wall temperature to enhance the shooting contrast, and adopts 7.5-9 micron filter transparent film coating to enhance the flow field shooting contrast. It is low-cost and simple to operate without adding other light sources or tracer particles.

[0068] It should be noted that the preset temperature condition, preset brightness and contrast condition can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0069] Optionally, in one embodiment of the present application, the calculation formula of the infrared spectrum radiation force on the high temperature background solid wall is:

[0070]

[0071] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, and T is the temperature of the high-temperature background solid wall;

[0072] The calculation formula for the energy of the high-temperature background solid wall in the infrared transmission band is:

[0073]

[0074] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength;

[0075] The calculation formula of infrared spectrum radiation power in the adjusted thermal imager detection band is:

[0076]

[0077] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength.

[0078] It is understandable that the infrared spectrum radiation power E bλ (Unit: W / m2μm) is defined as the radiation energy per unit wavelength under given temperature conditions. The integral of the spectral radiation power over the wavelength is the total energy of the infrared emission of the object.

[0079] Specifically, the calculation formula for infrared spectrum radiation power is:

[0080]

[0081] c1=3.7419×10 8 Wμm 4 / m 2 ,

[0082] c2=1.439×10 4 μmK,

[0083] The wavelength detected by a general uncooled long-wave infrared thermal imager is between 7 and 14 microns. Therefore, the energy (E b1 ) can be calculated using the following formula, where the energy is the area below the radiation force curve and the x-axis, as Figure 3 As shown in Figure 1, properly increasing the background wall temperature T helps to increase the spectral emission power and thus increase the brightness of the visualization image. However, the final imaging effect is also related to the contrast.

[0084]

[0085] The absorption band of Freon R134a is at 8-8.5μm. In this band, if there is 100% concentration of Freon R134a gas between the detected wall and the thermal imager, the infrared energy radiated by the wall in the 8-8.5μm band is almost absorbed by Freon and cannot be sensed by the thermal imager. This part of energy is defined as E b2 :

[0086]

[0087] Because of the presence of Freon R134a, it will cause energy absorption, and the absorption ratio α can be defined as: α=E b2 / E b1 The larger the proportional coefficient is, the more obvious the contrast of infrared visualization imaging is and the better the imaging effect is. Figure 4 This is the relationship between coefficient α and temperature under different wall temperature conditions without adding filter transparent film. The higher the temperature, the greater the absorption coefficient, but the cost of increasing the temperature is also higher. Generally, after 600K, the absorption coefficient has a weaker tendency to increase with increasing temperature. Therefore, considering the background brightness, absorption coefficient and the cost of increasing temperature, 600K can be used as a reasonable background wall temperature.

[0088] In addition, after using a filter transparent film treatment (adding a filter transparent film on the infrared lens that is completely consistent with the absorption band of R134a, that is, 8-8.5 microns), the absorption coefficient can be further increased to nearly 100%.

[0089] Optionally, in one embodiment of the present application, performing a visual display based on a visualized flow field also includes: processing image data collected by the infrared thermal imager according to shooting parameters of the infrared thermal imager, and reconstructing the image data to obtain a visualized flow field image that meets preset clarity conditions and preset resolution conditions, and performing a visual display of the visualized flow field based on the visualized flow field image.

[0090] It can be understood that in the embodiment of the present application, the visualized flow field image that meets the preset clarity condition and the preset resolution condition can be a flow field photo with higher clarity and resolution.

[0091] In the actual implementation process, the most direct means to improve the clarity of the embodiment of the present application is to use an infrared thermal imager with a higher pixel. At present, the actual physical resolution of the infrared thermal imager can reach 1024*768. It can be considered to take multiple groups of photos along various angles of the same flow field during shooting, that is, to shoot the same flow field at different positions and angles, so as to process the image data collected by the infrared thermal imager according to the shooting parameters of the infrared thermal imager, and reconstruct the large number of photos obtained at different angles and positions by artificial intelligence and other methods, so as to obtain flow field photos that meet higher clarity and resolution. In addition, the solution of increasing the concentration of Freon can also be adopted to make the fluid mixing boundary of the diffusion process clearer.

[0092] The embodiments of the present application can visualize the visualized flow field, improve the visualization effect of the visualized flow field, and improve the clarity and resolution of the visualized flow field.

[0093] It should be noted that the preset clarity condition and the preset resolution condition can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0094] According to the flow field visualization observation method based on infrared spectrum absorption characteristics proposed in the embodiment of the present application, Freon can be used as a mixing fluid, and a visualized flow field of the Freon and air mixing process can be obtained according to the mixing state. By increasing the temperature of the high-temperature background solid wall and installing a filter light-transmitting film to improve the contrast of the visualized flow field, the visualization accuracy and resolution of the flow field can be ensured, and the cost is low and the operation is simple, without adding other light sources or tracer particles. Thus, the problem that the addition of tracer particles in the related technology may affect the original flow state of the flow field, causing system errors, and the complexity of the experimental device and the high experimental cost are solved.

[0095] Next, a flow field visualization observation device based on infrared spectrum absorption characteristics proposed in an embodiment of the present application is described with reference to the accompanying drawings.

[0096] Figure 5 It is a structural schematic diagram of a flow field visualization observation device based on infrared spectrum absorption characteristics according to an embodiment of the present application.

[0097] like Figure 5 As shown, the flow field visualization observation device 10 based on infrared spectrum absorption characteristics includes: a collection module 100 , an analysis module 200 and a visualization module 300 .

[0098] Specifically, the acquisition module 100 is used to collect temperature data of a high-temperature background solid wall based on the infrared spectrum absorption characteristics of Freon.

[0099] The analysis module 200 is used to calculate the temperature distribution of the high-temperature background solid wall according to the temperature data, and to analyze the distribution of Freon according to the temperature distribution.

[0100] The visualization module 300 is used to obtain the mixing state of Freon and air according to the distribution of Freon, obtain the visualized flow field of the Freon and air mixing process according to the mixing state, and perform visualization display according to the visualized flow field.

[0101] Optionally, in one embodiment of the present application, the visualization module 300 includes: a control unit, an adjustment unit and a first visualization unit.

[0102] The control unit is used to control the high-temperature background solid wall surface to meet the preset temperature conditions, and obtain infrared thermal imaging photos that meet the preset brightness and contrast conditions.

[0103] The adjustment unit is used to adjust the infrared light transmission band of the infrared thermal imager by using the filter light transmission film of the infrared thermal imager to obtain the adjusted detection light transmission band of the thermal imager.

[0104] The first visualization unit is used to make the adjusted thermal imager detect the light transmission band to reach the target contrast of the visualized flow field, and to visualize the visualized flow field under the target contrast according to the infrared thermal imaging photos that meet the preset brightness and contrast conditions.

[0105] Optionally, in one embodiment of the present application, the calculation formula of the infrared spectrum radiation force on the high temperature background solid wall is:

[0106]

[0107] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, and T is the temperature of the high-temperature background solid wall;

[0108] The calculation formula for the energy of the high-temperature background solid wall in the infrared transmission band is:

[0109]

[0110] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength;

[0111] The calculation formula of infrared spectrum radiation power in the adjusted thermal imager detection band is:

[0112]

[0113] Among them, c1 and c2 are related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength.

[0114] Optionally, in one embodiment of the present application, the visualization module 300 further includes: a second visualization unit.

[0115] Among them, the second visualization unit is used to process the image data collected by the infrared thermal imager according to the shooting parameters of the infrared thermal imager, and reconstruct the image data to obtain a visualized flow field image that meets preset clarity conditions and preset resolution conditions, and visualize the visualized flow field based on the visualized flow field image.

[0116] Optionally, in one embodiment of the present application, the analysis module 200 includes: a judgment unit, an acquisition unit and an analysis unit.

[0117] The judging unit is used to judge whether there is air between the infrared thermal imager and the high-temperature background solid wall.

[0118] The acquisition unit is used to obtain the temperature distribution of the high-temperature background solid wall according to the infrared emissivity of the solid wall when there is air between the infrared thermal imager and the high-temperature background solid wall.

[0119] The analysis unit is used to count the temperature distribution of the high-temperature background solid wall according to the temperature data when Freon exists in the air, and analyze the distribution of Freon according to the temperature distribution.

[0120] It should be noted that the above explanation of the embodiment of the flow field visualization observation method based on infrared spectrum absorption characteristics is also applicable to the flow field visualization observation device based on infrared spectrum absorption characteristics of this embodiment, and will not be repeated here.

[0121] According to the flow field visualization observation device based on the infrared spectrum absorption characteristics proposed in the embodiment of the present application, Freon can be used as a mixing fluid, and a visualized flow field of the Freon and air mixing process can be obtained according to the mixing state. By increasing the temperature of the high-temperature background solid wall and installing a filter transparent film to improve the contrast of the visualized flow field, the visualization accuracy and resolution of the flow field are ensured, the cost is low, and the operation is simple, and no other light sources or tracer particles need to be added. Thus, the problem that the addition of tracer particles in the related technology may affect the original flow state of the flow field, causing system errors, and the complexity of the experimental device and the high experimental cost are solved.

[0122] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0123] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0124] When the processor 602 executes the program, the flow field visualization observation method based on infrared spectrum absorption characteristics provided in the above embodiment is implemented.

[0125] Furthermore, the electronic device further comprises:

[0126] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0127] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0128] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0129] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0130] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0131] The processor 602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0132] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the flow field visualization observation method based on infrared spectrum absorption characteristics as described above is implemented.

[0133] The embodiment of the present application also provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the flow field visualization observation method based on infrared spectral absorption characteristics as described above is implemented.

[0134] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0135] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0136] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0137] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0138] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0139] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0140] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0141] The storage medium mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A flow field visualization observation method based on infrared spectrum absorption characteristics, characterized in that: The following steps are involved: Based on the infrared spectrum absorption characteristics of Freon, the temperature data of the high-temperature background solid wall is collected; Counting the temperature distribution of the high-temperature background solid wall according to the temperature data, and analyzing the distribution of the Freon according to the temperature distribution; The mixing state of the Freon and the air is obtained according to the distribution of the Freon, and the visualized flow field of the Freon and air mixing process is obtained according to the mixing state, and a visual display is performed according to the visualized flow field.

2. The method according to claim 1, characterized in that The performing a visual display according to the visualized flow field includes: Controlling the high-temperature background solid wall surface to meet a preset temperature condition, and obtaining an infrared thermal imaging photo that meets preset brightness and contrast conditions; Using a filter light-transmitting film of the infrared thermal imager to adjust the infrared light-transmitting band of the infrared thermal imager to obtain an adjusted detection band of the thermal imager; The adjusted thermal imager detects a light-transmitting band that reaches a target contrast of the visualized flow field, and at the target contrast, the visualized flow field is visualized based on the infrared thermal imaging photograph that meets the preset brightness and contrast conditions.

3. The method according to claim 2, characterized in that The calculation formula of the infrared spectrum radiation force on the high temperature background solid wall is: Wherein, c1 and c2 are related constants, λ is the infrared emission energy band of the high temperature background solid wall, and T is the temperature of the high temperature background solid wall; The energy calculation formula of the high temperature background solid wall in the 7-14 micron infrared transmission band is: Wherein, c1 and c2 are the related constants, λ is the infrared emission energy band of the high temperature background solid wall, T is the temperature of the high temperature background solid wall, and dλ is the differential of the wavelength; The calculation formula of the infrared spectrum radiation power in the detection band of the thermal imager after adjustment is: Among them, c1 and c2 are the related constants, λ is the infrared emission energy band of the high-temperature background solid wall, T is the temperature of the high-temperature background solid wall, and dλ is the differential of the wavelength.

4. The method according to claim 2, characterized in that: The visual display according to the visual flow field further includes: The image data collected by the infrared thermal imager is processed according to the shooting parameters of the infrared thermal imager, and the image data is reconstructed to obtain a visualized flow field image that meets preset clarity conditions and preset resolution conditions, and the visualized flow field is visualized based on the visualized flow field image.

5. The method according to claim 1, characterized in that The method of collecting statistics on the temperature distribution of the high-temperature background solid wall according to the temperature data, and analyzing the distribution of the Freon according to the temperature distribution, includes: Determining whether the air exists between the infrared thermal imager and the high-temperature background solid wall; If the air exists between the infrared thermal imager and the high-temperature background solid wall, the temperature distribution of the high-temperature background solid wall is obtained according to the infrared emissivity of the solid wall; If the Freon exists in the air, the temperature distribution of the high-temperature background solid wall is statistically calculated based on the temperature data, and the distribution of the Freon is analyzed based on the temperature distribution.

6. A flow field visualization observation device based on infrared spectrum absorption characteristics, characterized in that: include: The acquisition module is used to collect temperature data of the high-temperature background solid wall based on the infrared spectrum absorption characteristics of Freon; An analysis module, used to calculate the temperature distribution of the high-temperature background solid wall according to the temperature data, and analyze the distribution of the Freon according to the temperature distribution; A visualization module is used to obtain the mixing state of the Freon and the air according to the distribution of the Freon, and to obtain a visualized flow field of the Freon and air mixing process according to the mixing state, and to perform a visualization display according to the visualized flow field.

7. The device according to claim 6, characterized in that The visualization module comprises: A control unit, used to control the high-temperature background solid wall surface to meet a preset temperature condition, and obtain an infrared thermal imaging photo that meets preset brightness and contrast conditions; An adjustment unit, used for adjusting the infrared light transmission band of the infrared thermal imager by using the filter light transmission film of the infrared thermal imager to obtain an adjusted detection light transmission band of the thermal imager; The visualization unit is used to make the adjusted thermal imager detect the light transmission band to reach the target contrast of the visualized flow field, and to visualize the visualized flow field according to the infrared thermal imaging photos that meet the preset brightness and contrast conditions under the target contrast.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the flow field visualization observation method based on infrared spectral absorption characteristics as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the flow field visualization observation method based on infrared spectrum absorption characteristics as described in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that The computer program is executed to implement the flow field visualization observation method based on infrared spectrum absorption characteristics as described in any one of claims 1 to 5.

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