Infrared spectrum absorption characteristic-based flow field visualization observation device

Abstract

The utility model relates to a flow field visualization observation device based on infrared spectrum absorption characteristics. The flow field visualization observation device comprises a high-temperature background solid wall surface; the infrared thermal imager is used for receiving an infrared light intensity signal generated by the infrared light source so as to determine the wall surface temperature field distribution condition; the processing assembly is arranged corresponding to the wall surface of the high-temperature background solid so as to determine the wall surface temperature field distribution condition when the preset Freon distribution condition is met; and the visual assembly is connected with the thermal infrared imager and the processing device, and the visual assembly displays a visual flow field in the mixing process of the Freon gas and the air based on the wall surface temperature field distribution condition and the wall surface temperature field distribution condition meeting the preset Freon distribution condition. 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 utility model relates to the technical field of fluid flow field observation and analysis, and particularly relates to a flow field visualization observation device based on the infrared spectral absorption characteristics. Background Art

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

[0003] In the related art, the existing flow field visualization technology is mainly the particle image velocimetry (PIV). In this technology, tiny particles are injected into the fluid. Since the geometric size and mass of the particles are too small, they move along with the fluid flow. Then, researchers can deduce the change process of the flow field by observing the movement of the particles. The PIV technology has the significant advantages of high flow field display accuracy and obvious visualization effect.

[0004] However, the related art has the following several disadvantages: 1. The selection of tracer particles is very important. After all, the volume and weight of the tracer particles cannot be ignored. Adding tracer particles may affect the original flow state of the flow field and cause systematic errors; 2. The cost of this technology is too high. It is very difficult for general scientific research institutions to configure PIV-related equipment and bear the high costs during the experiment process. Summary of the Utility Model

[0005] The utility model provides a flow field visualization observation device based on the infrared spectral absorption characteristics to solve the problems in the related art that adding tracer particles may affect the original flow state of the flow field, cause systematic errors, and the complexity of the experimental device and the experimental cost are relatively high.

[0006] In the first aspect of the embodiments of the present utility model, a flow field visualization observation device based on the infrared spectrum absorption characteristics is provided, including: a high-temperature background solid wall surface; an infrared thermal imager, which receives the infrared light intensity signal generated by an infrared light source to determine the wall surface temperature field distribution; a processing component, which is correspondingly arranged with the high-temperature background solid wall surface to determine the wall surface temperature field distribution when meeting the preset Freon distribution; a visualization component, which is connected to the infrared thermal imager and the processing component, and the visualization component displays the visualization flow field of the Freon gas and air mixing process based on the wall surface temperature field distribution and the wall surface temperature field distribution when meeting the preset Freon distribution.

[0007] Optionally, it further includes: an infrared glass window, which is arranged between the high-temperature background solid wall surface and the hot fluid pipeline.

[0008] Optionally, it further includes: a heat flow field pipeline, which is connected to the Freon gas chamber to transport the mainstream hot fluid.

[0009] Optionally, it further includes: an adjustment component, which adjusts the temperature of the high-temperature background solid wall surface.

[0010] Optionally, the infrared thermal imager includes: an infrared thermal imager lens, which adjusts the light transmission band of the infrared thermal imager according to the filter light transmission film of the infrared thermal imager to improve the target contrast of the visualization flow field and obtain a temperature field distribution photo.

[0011] Optionally, it further includes: a signal processing component, which is correspondingly arranged with the infrared thermal imager to process the infrared light intensity signal received by the infrared thermal imager and generate a flow field visualization image according to the infrared light intensity signal.

[0012] Optionally, it further includes: a heating component, which is correspondingly arranged with the high-temperature background solid wall surface and is used to heat the temperature of the high-temperature background solid wall surface to improve the brightness and contrast of the infrared thermal imaging flow field photo.

[0013] Optionally, it further includes: a communication component, which is connected to the visualization component and is used to send the visualization result of the visualization flow field to a preset terminal.

[0014] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0015] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0016] Figure 1 FIG. 4 is a schematic structural diagram of a flow field visualization observation device based on infrared spectral absorption characteristics according to an embodiment of the present utility model;

[0017] Figure 2 FIG. 8 is a schematic principle diagram of a flow field visualization observation device based on infrared spectral absorption characteristics according to an embodiment of the present utility model. Detailed Embodiment

[0018] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote 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 exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0019] The flow field visualization observation device based on infrared spectral absorption characteristics according to embodiments of the present utility model will be described below with reference to the accompanying drawings. In view of the problems in the related art mentioned in the above background technology that adding tracer particles may affect the original flow state of the flow field, causing systematic errors, and the complexity of the experimental device and the experimental cost are relatively high, the present utility model provides a flow field visualization observation device based on infrared spectral absorption characteristics. In this device, Freon gas can be used as the mixing fluid, and the mixing state can be obtained by analyzing infrared thermal imaging photos, and then the visualization flow field of the mixing process of Freon gas and air can be obtained. By increasing the temperature of the high-temperature background solid wall surface and installing a filtering and light-transmitting film, the contrast of the visualization flow field is improved, and the cost is low and the operation is simple without adding other light sources or tracer particles while ensuring the visualization accuracy and resolution of the flow field. Thus, the problems in the related art that adding tracer particles may affect the original flow state of the flow field, causing systematic errors, and the complexity of the experimental device and the experimental cost are relatively high are solved.

[0020] Specifically, Figure 1 FIG. 21 is a schematic structural diagram of a flow field visualization observation device based on infrared spectral absorption characteristics provided by an embodiment of the present utility model.

[0021] As Figure 1 shown, the flow field visualization observation device 10 based on infrared spectral absorption characteristics includes:

[0022] A high-temperature background solid wall surface 100.

[0023] In the actual implementation process, the embodiment of the present utility model includes a high-temperature background solid wall 100. Among them, a gas refrigerant (such as R134a) is used as the secondary flow cooling medium. The gas refrigerant R134a has a strong absorption peak in the infrared band of 8 - 8.5 microns. During the process of infrared light passing through the refrigerant gas, a large amount of its infrared energy will be absorbed, while in this band, air is in a state of complete transmission for infrared light energy, and the infrared light energy can completely pass through the air.

[0024] An infrared thermal imager 200, which receives the infrared light intensity signal generated by an infrared light source to determine the temperature field distribution of the wall surface.

[0025] Among them, the embodiment of the present utility model can utilize the infrared thermal imager 200 to receive the infrared light intensity signal generated by the infrared light source, and use the infrared thermal imager 200 to photograph and collect the temperature of the high-temperature background solid wall 100. If there is only air between the infrared thermal imager 200 and the high-temperature solid background wall 100, after correctly setting the infrared emissivity of the high-temperature background solid wall 100, the distribution of the wall surface temperature field can be accurately obtained.

[0026] The embodiment of the present utility model can use the refrigerant gas as the mixing fluid (or mixing tracer fluid), combine with the infrared thermal imager 200 for flow field observation, and utilize the infrared absorption characteristics of the refrigerant to conduct visual observation of the flow field, thereby ensuring the visualization accuracy and resolution of the flow field, and reducing the complexity of the experimental device and the experimental cost.

[0027] Optionally, the infrared thermal imager 200 includes: an infrared thermal imager lens, which adjusts the light transmission band of the infrared thermal imager 200 according to the filter light transmission film of the infrared thermal imager 200 to improve the target contrast of the visualized flow field and obtain a temperature field distribution photo.

[0028] It can be understood that the light transmission band of the infrared thermal imager lens in the embodiment of the present utility model is 7 - 14 microns, and the absorption peak band of the refrigerant gas is 8 - 8.5 microns. The light transmission band of the infrared thermal imager lens must completely cover the absorption band of the refrigerant gas. However, if the acquisition band of the infrared thermal imager 200 is much larger than the absorption band of the refrigerant gas, it will lead to a decrease in the total proportion of the energy absorbed by the refrigerant gas in the energy received by the infrared thermal imager 200 (that is, the proportion of the infrared energy absorbed due to the presence of the refrigerant gas in the total infrared emission energy decreases), resulting in a decrease in the contrast of the imaging result.

[0029] Therefore, the best way to enhance the contrast is to change the lens light transmission band of the infrared thermal imager 200 from 7 - 14 microns to 7.5 - 9 microns (slightly larger than the absorption peak of freon gas), thereby significantly enhancing the imaging contrast (in the 7.5 - 9 micron band, because the infrared emission energy of the high - temperature background solid wall 100 is basically absorbed by the freon gas, the observed temperature will be very low). The purpose of changing the receiving band of the infrared thermal imager 200 can be achieved by installing a filtering light - transmitting film with a specific band of 7.5 - 9 microns in front of the lens.

[0030] In the embodiment of the present utility model, while ensuring the visualization accuracy and resolution of the flow field, a new measurement method is adopted to significantly reduce the complexity of the experimental device and the experimental cost. The target contrast of the visualized flow field is obtained through the adjusted light - transmission band, and the visualization effect of the visualized flow field is enhanced according to the target contrast.

[0031] The processing component 300 is correspondingly arranged with the high - temperature background solid wall 100 to determine the wall temperature field distribution when the preset freon distribution condition is satisfied.

[0032] It can be understood that the preset freon distribution condition in the embodiment of the present application can be the situation when there is still freon gas in the air.

[0033] In the actual execution process, the infrared thermal imager 200 in the embodiment of the present utility model calculates the temperature by sensing the radiation energy. If the radiation energy decreases due to freon absorption, then the radiation energy sensed by the infrared thermal imager 200 will decrease, resulting in a lower temperature measurement. Therefore, if there is still freon fluid in the air, the infrared absorption characteristic of freon will cause the temperature of the photographed wall to decrease. The processing component 300 in the embodiment of the present utility model can determine the distribution of the wall temperature field when there is still freon gas in the air.

[0034] The visualization component 400 is connected to the infrared thermal imager 200 and the processing component 300. The visualization component 400 displays the visualized flow field of the freon gas - air mixing process based on the wall temperature field distribution and the wall temperature field distribution when the preset freon distribution condition is satisfied.

[0035] In the actual execution process, the visualization component 400 in the embodiment of the present utility model is connected to the infrared thermal imager 200 and the processing component 300, which can reflect the distribution of freon (i.e., the projection of the position of the freon gas on the photographed wall) and obtain the mixing state of the freon gas and air, and finally obtain and display the visualized flow field of the freon gas - air mixing process.

[0036] The embodiments of the utility model can be used for studying the flow field visualization problem of the mixed flow of the 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 device and the experimental cost are greatly reduced.

[0037] Optionally, it also includes: an infrared glass window, which is arranged between the high-temperature background solid wall 100 and the hot fluid pipeline.

[0038] It can be understood that the embodiment of the utility model can rely on the temperature change of the high-temperature background solid wall 100 to obtain the distribution of the Freon fluid, and then obtain the flow field visualization result. Therefore, increasing the temperature of the high-temperature background solid wall 100 as much as possible and adding a filtering transparent film to the infrared thermal imager lens are the keys to improving the contrast, because the infrared photo of the position where there is only air is brighter and the infrared photo of the position where Freon exists is darker, and the greater the Freon concentration, the darker the photo.

[0039] However, if the high-temperature background solid wall 100 contacts the mainstream hot air, the high temperature of the high-temperature background solid wall 100 will cause the temperature of the mainstream flow gas to rise, thereby seriously affecting the flow field. Therefore, in the actual implementation process, in order to achieve the purpose of increasing the background temperature while ensuring that the high-temperature background solid wall 100 does not affect the flow field temperature distribution of the mainstream hot air, the embodiment of the utility model can consider installing an infrared glass window between the high-temperature background solid wall 100 and the hot fluid pipeline to isolate the high-temperature wall and the mainstream air in the pipeline, and shoot the background solid through the high-transmittance infrared glass, such as Figure 2 shown.

[0040] The embodiment of the utility model can increase the background wall temperature to enhance the brightness and contrast of infrared photos, and adopts 7.5-9 micron filter light-transmitting film coating to enhance the contrast of flow field shooting. It has low cost and simple operation, and does not need to add other light sources or tracer particles.

[0041] Optionally, it also includes: a thermal flow field pipeline, which is connected to the Freon gas chamber to transport the mainstream thermal fluid.

[0042] It is understandable that the mainstream hot fluid in the embodiment of the utility model is hot air, and the cooling fluid is gas Freon R134a, which serves the purpose of cooling and visual observation at the same time.

[0043] Optionally, it also includes: a regulating component, which regulates the temperature of the high-temperature background solid wall 100.

[0044] It is understandable that the embodiments of the present invention can enhance and strengthen the visualization effect, which includes flow field observation contrast, clarity and resolution.

[0045] In the actual implementation process, the embodiments of the present utility model can use the adjustment component to adjust the temperature of the high-temperature background solid wall 100, so as to ensure that the temperature of the high-temperature background solid wall 100 can be increased, thereby improving the flow field observation contrast.

[0046] Optionally, it further includes: a signal processing component, which is correspondingly arranged with the infrared thermal imager 200 to process the infrared light intensity signal received by the infrared thermal imager 200 and generate a flow field visualization image according to the infrared light intensity signal.

[0047] Specifically, the signal processing component in the embodiments of the present utility model is correspondingly arranged with the infrared thermal imager 200 to process the infrared light intensity signal received by the infrared thermal imager 200 and generate a flow field visualization image. Among them, the most direct means to improve the clarity is to use an infrared thermal imager 200 with a higher pixel. Currently, the physical actual resolution of the infrared thermal imager can reach 1024*768. It can be considered to take multiple groups of photos at various angles along the same flow field during shooting, so as to process the image data collected by the infrared thermal imager 200 according to the shooting parameters of the infrared thermal imager 200, and use methods such as artificial intelligence to reconstruct the obtained a large number of photos at different angles and positions to obtain a flow field photo that meets higher clarity and resolution. In addition, a scheme of increasing the concentration of freon can also be adopted to make the fluid mixing boundary in the diffusion process clearer, improving the clarity and resolution of the flow field observation.

[0048] Optionally, it further includes: a heating component, which is correspondingly arranged with the high-temperature background solid wall 100 to heat the temperature of the high-temperature background solid wall 100 to improve the brightness of the infrared photo of the visualization flow field and the target contrast.

[0049] In the actual implementation process, the heating component in the embodiments of the present utility model is correspondingly arranged with the high-temperature background solid wall 100 to heat the temperature of the high-temperature background solid wall 100 to obtain the target contrast of the visualization flow field, thereby further improving the flow field observation contrast.

[0050] Optionally, it further includes: a communication component, which is connected to the visualization component 400 to send the visualization result of the visualization flow field to a preset terminal.

[0051] As a possible implementation manner, the communication component in the embodiments of the present utility model is connected to the visualization component 400 to send the visualization result of the visualization flow field to a preset terminal, such as sending the visualization result to a computer monitor, a mobile device, etc.

[0052] It should be noted that the preset terminal can be set by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0053] Specifically, it can be combined with Figure 2 As shown, a specific embodiment is used to elaborate in detail on the working principle of the flow field visualization observation device based on the infrared spectral absorption characteristics in the embodiments of the present invention.

[0054] As Figure 2 shown, the embodiments of the present invention may include: a high-temperature background solid wall 100, an infrared thermal imager 200, an infrared window 500, a Freon gas chamber 600, and a mainstream flow pipeline 700.

[0055] The flow field visualization observation device based on the infrared spectral absorption characteristics proposed according to the embodiments of the present invention can use Freon as the mixing fluid, analyze the mixing state based on infrared thermal imaging photos, and then obtain the visualized flow field of the mixing process of Freon gas and air. By increasing the temperature of the high-temperature background solid wall and installing a filtering and light-transmitting film, the contrast of the visualized flow field is improved, and the cost is low and the operation is simple without adding other light sources or tracer particles. In the future, it can be used as a key technology for flow field visualization research. Thus, the problems in the related art that adding tracer particles may affect the original flow state of the flow field, causing systematic errors, and the complexity of the experimental device and the experimental cost are relatively high are solved.

[0056] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. A flow field visualization observation device based on infrared spectrum absorption characteristics, characterized in that: include; High temperature background solid wall; An infrared thermal imager, which receives an infrared light intensity signal generated by an infrared light source to determine the distribution of the wall temperature field; A processing component, wherein the processing component is arranged corresponding to the high-temperature background solid wall surface to determine the wall surface temperature field distribution when a preset Freon distribution condition is met; A visualization component is connected to the infrared thermal imager and the processing component, and the visualization component displays a visualized flow field of the Freon gas and air mixing process based on the wall temperature field distribution and the wall temperature field distribution when the preset Freon distribution is met.

2. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1 is characterized in that: Also includes: An infrared glass window is arranged between the high-temperature background solid wall and the hot fluid pipeline.

3. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 2 is characterized in that: Also includes: A thermal flow field pipeline, wherein the thermal fluid pipeline is connected to the Freon gas chamber to transport the mainstream thermal fluid.

4. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1 is characterized in that: Also includes: A regulating component is used to regulate the temperature of the high-temperature background solid wall.

5. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1, characterized in that: The infrared thermal imager comprises: The infrared thermal imager lens adjusts the light transmission band of the infrared thermal imager according to the filter light transmission film of the infrared thermal imager to improve the target contrast of the visualized flow field and obtain a temperature field distribution photo.

6. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1, characterized in that: Also includes: A signal processing component is arranged corresponding to the infrared thermal imager to process the infrared light intensity signal received by the infrared thermal imager.

7. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1 is characterized in that: Also includes: A heating component is arranged corresponding to the high-temperature background solid wall surface and is used to heat the temperature of the high-temperature background solid wall surface to improve the brightness and contrast of the infrared thermal imaging flow field photograph.

8. The flow field visualization observation device based on infrared spectrum absorption characteristics according to claim 1 is characterized in that: Also includes: A communication component is connected to the visualization component and is used to send the visualization result of the visualized flow field to a preset terminal.

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