Method for testing intrinsic absorption resistance of infrared spectrum of engine tail flame

Abstract

The invention relates to an engine tail flame infrared spectrum intrinsic absorption resistance testing method which is realized based on a testing device. Comprising the steps that a testing device is arranged in a preset engine tail flame area; carrying out initial calibration on the testing device; the engine is started, and the testing device collects infrared radiation intensity information of engine tail flame; the testing device comprises an isolation pipeline, a detection window assembly connected with the isolation pipeline, a Fourier infrared spectrometer, a high-temperature black body, a vacuum pump, a gas supply assembly and a reflection assembly. The isolation pipeline is provided with a detection end, a first butt joint end and a second butt joint end; the detection end is opposite to the first butt joint end; the detection window assembly is installed in the detection end. The vacuum pump is connected with the isolation pipeline and is used for vacuumizing; the gas supply assembly is connected with the isolation pipeline and is used for filling replacement gas; the reflection assembly is arranged in the isolation pipeline and used for reflecting light emitted by the high-temperature black body to the Fourier infrared spectrometer so as to complete initial calibration.

Description

Technical Field

[0001] The invention relates to the technical field of engine tail flame detection, and in particular to an engine tail flame infrared spectrum anti-intrinsic absorption testing method. Background Art

[0002] During the ground test of engine tail flame, the climatic conditions of the test environment are constantly changing, which will have a significant impact on the measurement results of tail flame characteristics. The test environment not only includes factors such as air temperature, humidity, and air pressure, but is also affected by the interaction between the exhaust gas and the atmosphere during engine operation, resulting in a very complex relationship between on-site meteorological conditions and tail flame characteristics. At the same time, the composition, temperature, pressure, and distribution of particulate matter in the engine exhaust gas are constantly changing in different test stages and under different climatic conditions, which increases the difficulty of measuring tail flame characteristics.

[0003] In the tail flame test, CO 2 and H 2 Gases such as O2 have attracted the most attention because of their significant absorption characteristics in the mid-infrared band (4.3μm and 2.7μm). However, due to the changes in gas composition under different climatic conditions, as well as the influence of atmospheric absorption, shielding and stray light, there is a large deviation between the radiation intensity received by the detector and the actual radiation intensity of the engine tail flame, making it difficult to obtain accurate data.

[0004] In addition, the meteorological conditions at the test site often show local instability. For example, changes in wind speed and direction, uneven ground temperature, and possible airflow disturbances will have varying degrees of impact on the test results. Due to the interaction of these influencing factors and the difficulty in precise control, traditional tail flame characteristic test methods often find it difficult to effectively eliminate environmental interference, resulting in test results that cannot accurately reflect the true characteristics of the engine tail flame, seriously affecting the measurement accuracy. Summary of the invention

[0005] The purpose of the invention is to provide a method for testing the anti-intrinsic absorption of infrared spectrum of engine tail flame.

[0006] To achieve the above-mentioned purpose, the present invention provides a method for testing the anti-intrinsic absorption of infrared spectrum of engine tail flame, which is implemented based on a testing device; the method comprises the following steps: S1. Arrange the test device in a preset engine tail flame area; S2. Initial calibration of the test device; S3. Starting the engine, the testing device collects radiation information of the engine tail flame of the engine to obtain infrared radiation intensity information about the engine tail flame; The test device comprises: an isolation pipe for isolating interference from the engine tail flame gas detection path, a detection window assembly connected to the isolation pipe, a Fourier infrared spectrometer, a high-temperature black body, a vacuum pump, a gas supply assembly, and a reflection assembly; The isolation pipe has a detection end for extending into the engine tail flame, a first docking end for docking the Fourier infrared spectrometer, and a second docking end for docking the high-temperature black body; The detection end is arranged opposite to the first docking end; The detection window assembly is sealed and installed inside the detection end; The vacuum pump is connected to the isolation pipeline and is used to evacuate the isolation pipeline; The gas supply assembly is connected to the isolation pipeline and is used to fill the isolation pipeline with replacement gas; The reflection component is arranged in the isolation pipe, and is used for reflecting the light emitted by the high-temperature black body to the Fourier transform infrared spectrometer, so as to complete the initial calibration of the Fourier transform infrared spectrometer.

[0007] According to one aspect of the present invention, a gas delivery channel is provided in the side wall of the detection end, and a purge nozzle connected to the gas delivery channel is provided on the inner side of the side wall of the detection end; In the direction close to the engine tail flame, the purge nozzle is located in front of the detection window assembly; The gas delivery channel is connected to the gas supply assembly.

[0008] According to one aspect of the present invention, a plurality of the purge nozzles are arranged at intervals on the side wall of the detection end along the axial direction of the detection end.

[0009] According to one aspect of the present invention, a cooling structure is provided on the outer side of the detection end.

[0010] According to one aspect of the present invention, the detection window assembly comprises: infrared protection glass and a graphite sealing ring; The infrared protection glass is coaxially arranged inside the detection end, and the graphite sealing ring is arranged between the infrared protection glass and the detection end.

[0011] According to one aspect of the present invention, the infrared protection glass is made of As 2 Se 3 High transmittance coated glass or Ge coated glass.

[0012] According to one aspect of the present invention, the isolation pipe comprises: a first pipe portion and a second pipe portion; The second pipeline portion is arranged to communicate with the first pipeline portion; The opposite ends of the first pipe portion respectively form the detection end and the first docking end; An end of the second pipe portion away from the first pipe portion forms the second butt end.

[0013] According to one aspect of the present invention, the reflective assembly is arranged at a position where the first pipe portion is connected to the second pipe portion; The reflection component includes: a driver and a reflector; The driver is used to drive the reflector to move so as to change the position of the reflector; wherein, when the test device is initially calibrated, the driver is used to drive the reflector to reflect the light emitted by the high-temperature black body to the Fourier infrared spectrometer.

[0014] According to one aspect of the present invention, the reflector is made of optical glass or a filter.

[0015] According to one aspect of the present invention, the gas supplied by the gas supply assembly is an inert gas or nitrogen; When the vacuum pump evacuates the isolation pipe, it stops when the air content in the isolation pipe drops to the Pa level.

[0016] According to one solution of the present invention, the present invention is aimed at a field test environment. It can combine a Fourier spectrometer and an optical channel isolation test extending into the flame to minimize the influence of the atmospheric absorption window on the intrinsic infrared radiation intensity of the tail flame through hardware design and field calibration.

[0017] According to one solution of the present invention, by providing a gas delivery channel and a purge nozzle at the detection end, the delivered gas can be used to achieve a purge effect on the detection window assembly, which helps to blow away the smoke particles generated during the flame combustion process, and can fully ensure the cleanliness and light transmittance of the detection window assembly during the test. In addition, the provided gas delivery channel can also achieve a cooling effect based on the delivered gas during the gas delivery process, so as to effectively ensure the stability and reliability of the structure of the detection end.

[0018] According to one solution of the present invention, by arranging multiple purge nozzles, the detection window assembly can be cleaned in multiple directions, effectively ensuring the cleaning effect of the present invention. In addition, by adopting the method of purge in multiple directions, the detection window assembly can also be cooled uniformly, which greatly ensures the reliability and stability of the detection window assembly.

[0019] According to a solution of the present invention, the provided graphite sealing ring can effectively ensure the sealing performance of the installation position in a high temperature environment, making the measurement effect of the present invention more beneficial.

[0020] According to one solution of the present invention, the above-mentioned isolation pipes can be used to achieve an organic combination of the component structures, and vacuuming and gas replacement can be completed simultaneously through the isolation pipes, which effectively ensures the ease of use of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a principle diagram schematically showing a testing device according to an embodiment of the present invention; Figure 2 is an enlarged view schematically showing a detection end according to an embodiment of the present invention; Figure 3 is a three-dimensional structural diagram schematically showing a reflective assembly according to an embodiment of the present invention; Figure 4 is a three-dimensional structural diagram schematically showing a reflective assembly in another direction according to an embodiment of the present invention; Figure 5 is a cross-sectional view schematically showing a reflective assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0025] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a method for testing the anti-intrinsic absorption of an engine tail flame infrared spectrum of the present invention is implemented based on a testing device; it includes the following steps: S1. Arrange the test device in the preset engine tail flame area; S2. Initially calibrate the test device; S3. Start the engine, and the test device collects radiation information of the engine tail flame to obtain infrared radiation intensity information about the engine tail flame; In this embodiment, during the engine tail flame ground test, since the climate conditions of the test environment are constantly changing, the exhaust gas from the engine during operation will form a microclimate environment at the test site, and the gas composition, temperature, pressure, and particle distribution will constantly change. If there is wind, the changes will be more drastic. 2 and H 2 Some characteristics of O in the mid-infrared band (4.3μm, 2.7μm) are severely affected by atmospheric absorption, obstruction and spurious on the detection path, and the mechanism is very complicated, resulting in the test results being unable to accurately characterize the true radiation intensity of the engine tail flame. Aiming at the on-site test environment, combined with the Fourier spectrometer, the optical channel isolation test method deep into the flame is studied. Through hardware design and on-site calibration, the influence of the atmospheric absorption window on the intrinsic infrared radiation intensity of the tail flame is minimized. Therefore, in this scheme, the anti-intrinsic absorption test method can minimize the influence of the external environment on the experimental results (infrared radiation intensity and other characteristics).

[0026] In this embodiment, the test device includes: an isolation pipe 1 for isolating the interference of the engine tail flame gas detection path, a detection window assembly 2 connected to the isolation pipe 1, a Fourier infrared spectrometer 3, a high-temperature black body 4, a vacuum pump 5, a gas supply assembly 6, and a reflection assembly 7; wherein the isolation pipe 1 has a detection end 11 for extending into the engine tail flame, a first docking end 12 for docking the Fourier infrared spectrometer 3, and a second docking end 13 for docking the high-temperature black body 4. In this embodiment, the detection end 11 is arranged opposite to the first docking end 12; wherein the detection window assembly 2 is sealed and installed inside the detection end 11, and the detection window assembly 2 and the end of the detection end 11 are spaced apart. By arranging the detection window assembly 2 and the end of the detection end 11 with a space, the flame can be effectively prevented from directly scouring the detection window assembly 2, and the structural reliability of the detection window assembly 2 can be effectively ensured. The interval between the detection window assembly 2 and the end of the detection end 11 is between 10 cm ± 0.5 cm, so that there is a sufficient distance between the detection window assembly 2 and the engine tail flame to fully ensure its safety and avoid burning of the engine tail flame.

[0027] Furthermore, the vacuum pump 5 is connected to the isolation pipe 1 for evacuating the isolation pipe 1. The gas supply assembly 6 is connected to the isolation pipe 1 for filling the isolation pipe 1 with an inert gas. In this embodiment, the reflection assembly 7 is arranged in the isolation pipe 1 for reflecting the light emitted by the high-temperature black body 4 to the Fourier infrared spectrometer 3 to complete the initial calibration of the Fourier infrared spectrometer 3.

[0028] like Figure 2 As shown, according to an embodiment of the present invention, a gas delivery channel 111 is provided in the side wall of the detection end 11, and a purge nozzle 112 connected to the gas delivery channel 111 is provided on the inner side of the side wall of the detection end 11; wherein the gas delivery channel 111 is provided along the axial direction of the detection end 11, and thus, an opening corresponding to the gas delivery channel 111 can be further provided on the inner side of the side wall of the detection end 11 to facilitate the installation of the purge nozzle 112. In this embodiment, the purge nozzle 112 is located in front of the detection window assembly 2 along the direction close to the engine tail flame; the gas delivery channel 111 is connected to the gas supply assembly 6. In this embodiment, the purge nozzle 112 can be reliably fixed to the gas delivery channel 111 by means of a threaded connection; accordingly, in order to ensure the reliable use of the purge nozzle 112, it can be made of high-temperature resistant materials. For example, the purge nozzle 112 can be made of high-temperature resistant alloy steel to ensure its structural stability in a high-temperature environment, and it can also effectively ensure that it has strong impact resistance in a high-temperature environment, which is more beneficial to ensuring the cleanliness and reliability of the rear detection window assembly 2.

[0029] Through the above configuration, by providing the gas delivery channel 111 and the purge nozzle 112 at the detection end 11, the delivered gas can be used to achieve a purge effect on the detection window assembly 2, which helps to blow away the smoke particles generated during the flame combustion process, and can fully ensure the cleanliness and light transmittance of the detection window assembly 2 during the test. In addition, the provided gas delivery channel 111 can also achieve a cooling effect based on the delivered gas during the gas delivery process, so as to effectively ensure that the structure of the detection end 11 is stable and reliable.

[0030] like Figure 2As shown, according to one embodiment of the present invention, along the axial direction of the detection end 11, on the side wall of the detection end 11, a plurality of purge nozzles 112 are arranged at intervals. In this embodiment, when a plurality of purge nozzles 112 are provided, a plurality of gas delivery channels 111 can be provided correspondingly thereto to achieve the corresponding installation of each purge nozzle 112. Of course, an annular channel can also be arranged on the side wall of the detection end 11, and openings can be arranged at intervals on the annular channel to achieve the installation of a plurality of purge nozzles 112. In this embodiment, a plurality of purge nozzles 112 are arranged obliquely relative to the infrared protective glass 21, wherein the inclination angles of the purge nozzles 112 relative to the infrared protective glass 21 are consistent, thereby achieving the effect of blowing off the same position in different directions to fully ensure the cleanliness of the infrared protective glass 21. Of course, the position where the gas blown out by each purge nozzle 112 contacts the infrared protective glass 21 is different from the central position of the infrared protective glass 21, so that each purge nozzle 112 can form an annular blowing area on the infrared protective glass 21, which greatly ensures the blowing effect over a large area. In addition, in another embodiment, the inclination angles of the plurality of purge nozzles 112 relative to the infrared protective glass 21 can be set to be inconsistent, so that the flexible arrangement of the blowing area of ​​the infrared protective glass 21 can be more flexibly realized. For example, the inclination angles used by adjacent purge nozzles 112 are inconsistent, while the purge nozzles 112 arranged at intervals are set to be consistent, so that the purge areas of the purge nozzles 112 at adjacent positions can be different annular areas, and the purge areas of the purge nozzles 112 at intervals can be the same annular areas, thereby achieving a wider range of blowing effects. Similarly, the corresponding inclination angles can be flexibly adjusted according to the number of purge nozzles 112 so that the purge area is increased or reduced, so as to further ensure the flexibility of use of this solution.

[0031] Through the above arrangement, the detection window assembly 2 can be cleaned in multiple directions by arranging multiple purge nozzles 112, which effectively ensures the cleaning effect of the present invention. In addition, by adopting the method of purge in multiple directions, the detection window assembly 2 can also be cooled uniformly, which greatly ensures the reliability and stability of the detection window assembly 2.

[0032] like Figure 2As shown, according to an embodiment of the present invention, a cooling structure 113 is provided on the outside of the detection end 11. In this embodiment, the cooling structure 113 can be implemented by at least one of a water cooling structure, a liquid metal cooling structure, a gas cooling structure, a ceramic material cooling structure, and an ultra-high temperature heat pipe, and can be arranged on the outside of the detection end 11 in a sleeve manner. Among them, the water cooling structure can adopt high-temperature water cooling, wherein water is used as a cooling medium to take away heat from the high-temperature area. Specifically, although the boiling point of water is 100°C, the use of a high-pressure water cooling system can keep the water liquid at high temperatures, thereby achieving cooling. In the liquid metal cooling structure, the liquid metal (such as sodium, potassium, lead, etc.) used has good thermal conductivity and can be used as a cooling medium in a high-temperature environment. Liquid metal can effectively take away extremely high temperature heat and remain liquid at very high temperatures. In the gas cooling structure, high-temperature gas (such as helium, nitrogen or other inert gas) is used to take away heat through high-speed flow, which usually includes a high-pressure gas circulation system to take away the heat generated by the heat source through airflow. In the cooling structure of ceramic materials, ceramic materials (such as alumina, silicon nitride, etc.) have high heat resistance and good thermal conductivity, and are used in cooling structures in high-temperature environments. They can withstand temperatures of several thousand degrees without melting, so they are often used as the external protective layer of high-temperature equipment to reduce heat conduction. Ultra-high temperature heat pipes are devices that use the phase change characteristics of working fluids to transfer heat. In a high-temperature environment, the working fluid (such as sodium, chloride, etc.) evaporates near the heat source, takes away the heat, and then condenses and refluxes through the cooling area. Heat pipes have efficient thermal conductivity and are suitable for thermal management at extremely high temperatures.

[0033] In this embodiment, the above-mentioned cooling structure 113 can adopt a single type of structure to achieve cooling, and of course, it can also adopt a variety of combinations to achieve cooling. When a variety of combinations are adopted to achieve cooling, they can be set separately based on the different areas where the detection end 11 extends into the engine tail flame. The higher the temperature, the faster and more effective the heat dissipation capacity can be adopted. Therefore, based on this setting method, the corresponding cooling structure types can be arranged in sequence on the detection end 11 to ensure that the temperature on the detection end 11 is reliably maintained within a reasonable range, which is beneficial to avoid affecting the installation position of the detection window assembly 2, thereby eliminating the influence of temperature on the detection window assembly 2, which is beneficial to ensuring the measurement accuracy of this scheme.

[0034] like Figure 2 As shown, according to one embodiment of the present invention, the detection window assembly 2 includes: an infrared protective glass 21 and a graphite sealing ring 22; wherein the infrared protective glass 21 is coaxially arranged inside the detection end 11, and the graphite sealing ring 22 is arranged between the infrared protective glass 21 and the detection end 11.

[0035] Through the above-mentioned configuration, the graphite sealing ring 22 can effectively ensure the sealing performance of the installation position in a high temperature environment, making the measurement effect of the present invention more beneficial; in addition, the graphite sealing ring also has excellent stability, low thermal expansion coefficient, and thermal shock resistance, which is more beneficial to maintaining reliable protection of the infrared protective glass 21.

[0036] In this embodiment, the infrared protection glass 21 is made of As 2 Se 3 High transmittance coated glass or Ge coated glass.

[0037] like Figure 1 As shown, according to one embodiment of the present invention, the isolation pipeline 1 includes: a first pipeline portion 1a and a second pipeline portion 1b; wherein the second pipeline portion 1b is connected to the first pipeline portion 1a. In this embodiment, the two opposite ends of the first pipeline portion 1a respectively form a detection end 11 and a first docking end 12; and the end of the second pipeline portion 1b away from the first pipeline portion 1a forms a second docking end 13. In this embodiment, the first pipeline portion 1a and the second pipeline portion 1b can be straight pipelines respectively, and can be connected in a mutually perpendicular manner.

[0038] Through the above-mentioned isolation pipe 1, it is possible to achieve an organic combination of the component structures, and through the isolation pipe 1, vacuuming and gas replacement can be completed simultaneously, which effectively ensures the convenience of use of the present invention.

[0039] In this embodiment, the first pipe portion 1a constituting the detection end 11 can be made of high temperature resistant alloy steel to effectively ensure its high temperature resistance. Of course, the first pipe portion 1a can also be made of high temperature resistant alloy steel as a whole, or the first pipe portion 1a and the second pipe portion 1b can be made of high temperature resistant alloy steel as a whole.

[0040] Combination Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, according to an embodiment of the present invention, the reflective assembly 7 is arranged at a position where the first pipe portion 1a is connected to the second pipe portion 1b; wherein the reflective assembly 7 comprises: a driver 71 and a reflector 72; specifically, the driver 71 is used to drive the reflector 72 to move so as to change the position of the reflector 72; further, when the test device is initially calibrated, the driver 71 is used to drive the reflector 72 to reflect the light emitted by the high-temperature black body 4 to the Fourier infrared spectrometer 3. When the initial calibration of the test device is completed, the reflector 72 can be retracted based on the driver 71 to avoid interference of the reflector 72 with the optical path between the detection window assembly 2 and the Fourier infrared spectrometer 3.

[0041] In this embodiment, a connecting shaft A for the reflector 72 to be rotatably connected is provided at the position where the first pipe part 1a and the second pipe part 1b are connected, wherein a mounting hole for mounting the connecting shaft A can be provided in advance on the pipe wall at the position where the first pipe part 1a and the second pipe part 1b are connected, and then the connecting shaft A can be fixed on the mounting hole by threaded connection, welding, etc., wherein, since the isolation pipe 1 needs to maintain the overall air tightness, it is necessary to ensure that the installation position of the connecting shaft A has sufficient air tightness. Further, in order to realize the rotation of the reflector 72, a rotating sleeve 72a matching the connecting shaft A can be provided on the reflector 72; wherein, in order to ensure the accuracy of the rotation position of the reflector 72, a retaining spring, a protrusion, etc. can be provided on the connecting shaft A to achieve accurate restriction of the position of the rotating sleeve 72a, so as to ensure the reliable and accurate posture of the reflector 72 when it is retracted.

[0042] Furthermore, the reflector 72 also needs to be provided with a driving connection structure 72b connected to the driver 71, wherein the driving connection structure 72b can be provided in the form of a rotating sleeve or a rotating shaft to achieve flexible position adjustment. In this embodiment, the driving connection structure 72b is provided at the other end of the reflector 72 opposite to the connecting shaft A.

[0043] In this embodiment, in order to facilitate the installation of the driver 71 and have sufficient stroke to adjust the tilt angle range of the reflector 72, a third pipe portion 1c can be set on the first pipe portion 1a opposite to the second pipe portion 1b, wherein, in order to ensure the airtightness of the entire isolation pipe 1, it is also necessary to set the end of the third pipe portion 1c away from the first pipe portion 1a to be closed, so as to achieve the sealing of part of the structure in the driver 71 in the isolation pipe 1.

[0044] In this embodiment, the driver 71 includes: a transmission structure 711 and a driving structure; wherein the transmission structure 711 can be set as a rod or a frame structure, wherein when the transmission structure 711 is set as a frame structure, it includes: transmission rods 711b arranged in parallel and at intervals, a transmission connection shaft 711a arranged at one end of the transmission rod 711b, and an input transmission rod 711c arranged at the other end of the transmission rod 711b; wherein the transmission connection shaft 711a is arranged in parallel with the input transmission rod 711c, so that the transmission structure 711 forms an annular frame; in this embodiment, the transmission connection shaft 711a realizes a rotational connection with the driving connection structure 72b; it should be noted that when the driving connection structure 72b is set as a rotating shaft, the transmission connection shaft 711a can also be replaced by a sleeve structure, so as to realize a rotational connection between each other. In another embodiment, the transmission structure 711 can be set as a rod, that is, half of the above-mentioned frame structure can be used, which will not be repeated here. By means of the transmission structure 711 arranged as above, the inclination angle of the reflector 72 can be adjusted flexibly and conveniently, and the influence on the optical path can be fully avoided.

[0045] Further, in order to realize the corresponding action of the transmission structure 711, the driving structure can be set as a structural component that can produce the corresponding action; specifically, the driving structure can adopt a manual structure, which includes: a driving turntable 712, an extension shaft 713 and a manual knob 714; wherein the extension shaft 713 is coaxially arranged on one side of the driving turntable 712 with the driving turntable 712, and a transition connection structure that is rotatably connected to the end of the input transmission rod 711c is arranged on the other side of the driving turntable 712, and accordingly, the end of the input transmission rod 711c is arranged to match the transition connection structure to realize the rotational connection between them, wherein the transition connection structure is eccentrically arranged on the driving turntable 712, thereby, the corresponding driving effect on the transmission structure 711 can be realized by rotating the manual knob 714. In this embodiment, since the extension shaft 713 passes through the side wall of the third pipeline part 1c to extend outside, a graphite sealing ring is further required to be arranged between the extension shaft 713 and the side wall of the third pipeline part 1c to achieve reliable maintenance of the airtightness inside the isolation pipeline 1. In this embodiment, in order to achieve reliable maintenance of the tilt angle of the reflector 72, a corresponding limit locking structure may be provided in the driving structure, so as to achieve stable and reliable maintenance of the angle after adjustment.

[0046] It should be noted that the drive structure can also be set as a gear transmission structure, a gear rack structure, a screw nut structure, etc. Of course, in another embodiment, the drive structure can be further implemented by an electric drive structure, thereby further achieving corresponding precise control and automatic control.

[0047] According to one embodiment of the present invention, in order to further ensure the stability and reliability of the angle adjustment of the reflector 72, a slide rail (or sliding groove) can be further arranged on the side wall of the isolation pipe 1, and a transmission shaft matching it can be arranged on the side of the reflector 72 accordingly, so that the reflector 72 can always change along the slide rail (or sliding groove) during the adjustment process, thereby achieving reliable and stable adjustment process.

[0048] For the reflective assembly 7 set above, when it is used for calibration, the manual knob 714 is rotated to drive the transmission structure 711 to deflect, so that the mirror surface of the reflector 72 and the axes of the high-temperature black body 4 and the Fourier infrared spectrometer 3 are all at an angle of 45°, so as to achieve the purpose of reflecting the light emitted by the high-temperature black body 4 to the Fourier infrared spectrometer 3. Further, when implementing the test, the manual knob 714 is rotated to drive the transmission structure 711 to move, so that the mirror surface of the reflector 72 is parallel to the axis of the Fourier infrared spectrometer 3, so as to achieve the purpose of blocking the calibration channel and avoiding the Fourier infrared spectrometer 3; of course, when implementing the test, the adjustment method of the reflector 72 can also be further adjusted to a state where the mirror surface is perpendicular to the axis of the Fourier infrared spectrometer 3 based on different types of reflectors 72 to achieve the optimization of the external input spectrum.

[0049] like Figure 1 As shown, according to one embodiment of the present invention, the reflector 72 uses optical glass or a filter; wherein the optical glass used has a high reflectivity and can effectively reflect light. In addition, the filter used can also be set as a molecular filter, which can not only achieve the reflection effect of the calibration process, but also filter a specific spectrum during the test process; specifically, the radiation characteristics of the engine tail flame are distributed in a specific spectrum band, so it is necessary to collect radiation information for a specific spectrum band. Compared with the ordinary filter solution, the molecular filter is used for spectral band filtering, which has the advantages of narrower bandwidth and can eliminate background noise. Among them, the molecular filter is a filter device with a comb-shaped discrete transmission spectrum, which uses the same molecules to accurately extract all signal spectra within the filter transmission band, and suppress the background noise between and outside the absorption lines. Since the working substance uses gas molecules of the same type as the gas to be measured in the target, the transmission spectrum strictly matches the target spectrum frequency, and the transmission frequency is stable. Among them, the differential absorption molecular filter controls the absorption of signal light and background light by molecular gas by changing the working pressure in the molecular gas chamber or the length of the molecular gas chamber, thereby filtering out background noise.

[0050] like Figure 1 As shown, according to one embodiment of the present invention, the gas supplied by the gas supply assembly 6 is an inert gas or nitrogen.

[0051] like Figure 1As shown, according to one embodiment of the present invention, when the vacuum pump 5 evacuates the isolation pipe 1, it stops when the air content in the isolation pipe 1 drops to the Pa level. Through the above-mentioned setting, it can be effectively ensured that the air content in the isolation pipe 1 drops to an extremely low range, which can fully reduce the influence of air on the measurement result, and effectively ensure the measurement accuracy of the present invention.

[0052] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0053] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the anti-intrinsic absorption of infrared spectrum of engine tail flame, characterized in that: Based on the test device implementation; It includes the following steps: S1. Arrange the test device in a preset engine tail flame area; S2. Initial calibration of the test device; S3. Starting the engine, the testing device collects radiation information of the engine tail flame of the engine to obtain infrared radiation intensity information about the engine tail flame; The testing device comprises: an isolation pipe (1) for isolating interference from the engine tail flame gas detection path, a detection window component (2) connected to the isolation pipe (1), a Fourier infrared spectrometer (3), a high-temperature black body (4), a vacuum pump (5), a gas supply component (6), and a reflection component (7); The isolation pipe (1) has a detection end (11) for extending into the engine tail flame, a first docking end (12) for docking with the Fourier infrared spectrometer (3), and a second docking end (13) for docking with the high-temperature black body (4); The detection end (11) and the first docking end (12) are arranged opposite to each other; The detection window assembly (2) is sealed and installed inside the detection end (11); The vacuum pump (5) is connected to the isolation pipeline (1) and is used to evacuate the isolation pipeline (1); The gas supply assembly (6) is connected to the isolation pipeline (1) and is used to fill the isolation pipeline (1) with replacement gas; The reflection component (7) is arranged in the isolation pipe (1) and is used to reflect the light emitted by the high-temperature black body (4) to the Fourier transform infrared spectrometer (3) to complete the initial calibration of the Fourier transform infrared spectrometer (3).

2. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 1 is characterized in that: A gas delivery channel (111) is provided in the side wall of the detection end (11), and a purge nozzle (112) connected to the gas delivery channel (111) is provided on the inner side of the side wall of the detection end (11); In a direction close to the engine tail flame, the purge nozzle (112) is located in front of the detection window assembly (2); The gas delivery channel (111) is connected to the gas supply component (6).

3. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 2 is characterized in that: Along the axial direction of the detection end (11), a plurality of purge nozzles (112) are arranged at intervals on the side wall of the detection end (11).

4. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 3 is characterized in that: A cooling structure (113) is provided on the outer side of the detection end (11).

5. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 4 is characterized in that: The detection window assembly (2) comprises: an infrared protection glass (21) and a graphite sealing ring (22); The infrared protection glass (21) is coaxially arranged inside the detection end (11) and the detection end (11), and the graphite sealing ring (22) is arranged between the infrared protection glass (21) and the detection end (11).

6. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 5, characterized in that: The infrared protection glass (21) is made of As2Se3 high-transmittance coated glass or Ge coated glass.

7. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 6, characterized in that: The isolation pipeline (1) comprises: a first pipeline portion (1a) and a second pipeline portion (1b); The second pipeline part (1b) is arranged to communicate with the first pipeline part (1a); The opposite ends of the first pipe portion (1a) respectively form the detection end (11) and the first docking end (12); An end of the second pipe portion (1b) away from the first pipe portion (1a) forms the second butt end (13).

8. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 7, characterized in that: The reflective component (7) is arranged at a position where the first pipe portion (1a) and the second pipe portion (1b) are connected; The reflection component (7) comprises: a driver (71) and a reflector (72); The driver (71) is used to drive the reflector (72) to move so as to change the position of the reflector (72); wherein, when the test device is initially calibrated, the driver (71) is used to drive the reflector (72) to reflect light emitted by the high-temperature black body (4) to the Fourier infrared spectrometer (3).

9. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 8, characterized in that: The reflector (72) is made of optical glass or a filter.

10. The engine tail flame infrared spectrum anti-intrinsic absorption test method according to claim 9, characterized in that: The gas supplied by the gas supply component (6) is an inert gas or nitrogen; When the vacuum pump (5) evacuates the isolation pipe (1), it stops when the air content in the isolation pipe (1) drops to the Pa level.

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