Hot end component multi-zone temperature distribution simultaneous measurement apparatus and method

Abstract

The application provides a hot end component multi-region temperature distribution synchronous measurement device and method, belongs to the technical field of testing, and comprises a hot end component, a measurement probe one and a measurement probe two for synchronously measuring different regions of the hot end component, and a rear end optical path of a fiber bundle three is sequentially provided with a lens group and a filter, so that an optical signal is guided to a surface array detector, and the surface array detector communicates with a remote industrial computer through a network cable. The application adopts the structure of fiber bundle splitting and beam combining transmission, uses the measurement probe one and the measurement probe two to respectively collect spectral signals of different regions, and combines the spectral signals into the fiber bundle three through the fiber bundle one and the fiber bundle two after transmission, and finally the spectral signals are synchronously received and processed by a single surface array detector, so that the effect of realizing multi-region synchronous temperature distribution measurement by using a set of core detection system is achieved, and the problems of high cost and limited installation space of the traditional multi-infrared thermal imager scheme are effectively overcome.

Description

Technical Field

[0001] This invention belongs to the field of testing technology, specifically relating to a device and method for synchronously measuring the temperature distribution of multiple regions of hot-end components. Background Technology

[0002] With the continuous improvement of aero-engine performance, the gas inlet temperature is constantly rising, and the hot-end components inside the turbine are subjected to higher thermal loads. The gas temperature is far higher than the operating temperature of the hot-end component materials, so it is necessary to cool the hot-end components to ensure that they operate within a safe temperature range. In order to accurately design the internal cooling structure of the hot-end components and evaluate the service life of the hot-end components, it is necessary to accurately measure the surface temperature distribution of the hot-end components inside the turbine on a component thermal shock test bench.

[0003] Currently, common methods for measuring hot-end components include contact and non-contact methods. Contact temperature measurement methods primarily use thermocouples, which are embedded in the surface of the hot-end component to measure its surface temperature. However, thermocouple installation can damage the component's structure, affecting the measurement results. Furthermore, thermocouples only measure a limited number of discrete points, failing to capture the temperature distribution characteristics. Thermocouples also have a short lifespan at high temperatures, are difficult to install, and are challenging to maintain. Non-contact temperature measurement methods primarily use infrared thermal imagers. These methods do not require contact with the hot-end component surface to measure its surface temperature distribution characteristics. They are easy to maintain and have a long lifespan. However, simultaneous measurement in multiple areas requires multiple infrared thermal imagers, resulting in high costs. The large size of the equipment also presents challenges for installation in space-constrained test sections. Therefore, there is a need to develop low-cost, compact devices and methods for simultaneous measurement of multi-area temperature distribution in hot-end components to meet the needs of hot-end component surface temperature distribution measurement and promote the rapid development of my country's aero-engine technology. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for synchronously measuring the temperature distribution of multiple regions of hot-end components, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A device and method for synchronously measuring the temperature distribution of multiple regions of a hot-end component includes a hot-end component and two measuring probes for synchronously measuring different regions of the hot-end component. The measuring probe is connected to an optical fiber bundle, and the measuring probe is connected to an optical fiber bundle. The optical fiber bundles are combined to form an optical fiber bundle. The optical path at the rear end of the optical fiber bundle is provided with a lens group and a filter to guide the optical signal to a surface array detector. The surface array detector communicates with a remote industrial control computer via a network cable.

[0006] As a preferred embodiment of the present invention, the first measuring probe is provided with a high-pressure protective gas inlet, the second measuring probe is provided with a high-pressure protective gas inlet, the first high-pressure protective gas inlet is connected to a high-pressure gas pipeline, the second high-pressure protective gas inlet is connected to a high-pressure gas pipeline, and the first high-pressure gas pipeline and the second high-pressure gas pipeline are both connected to a high-pressure gas source.

[0007] As a preferred embodiment of the present invention, a one-way valve is provided on the first high-pressure gas pipeline, a one-way valve is provided on the second high-pressure gas pipeline, and a pressure reducing valve, a filter and a pressure sensor are sequentially provided on the pipeline downstream of the high-pressure gas source.

[0008] As a preferred embodiment of the present invention, the three fiber bundles are imaged on the target surface of the surface array detector into region one and region two, wherein region one is composed of multiple fiber ones and region two is composed of multiple fiber twos.

[0009] As a preferred embodiment of the present invention, both the first and second measuring probes are equipped with an achromatic lens group and have an optical fiber interface for connecting the optical fiber bundle.

[0010] As a preferred embodiment of the present invention, the first measuring probe and the second measuring probe are installed and sealed using flanges. The front ends of the first measuring probe and the second measuring probe are provided with optical guide tubes. In a confined space, the first measuring probe and the second measuring probe are installed using internal threads and sealed using a C-type sealing structure.

[0011] As a preferred embodiment of the present invention, when the wall temperature at the installation location is high, both the first and second measuring probes are externally covered with water-cooled components. The water-cooled components are provided with cooling water inlet and cooling water outlet to protect the internal achromatic lens group and fiber optic interface with circulating cooling water.

[0012] According to another aspect of this application, this application also provides a measurement method using the aforementioned measuring device. The measurement method includes the following measurement steps: aligning measuring probe one and measuring probe two with different areas to be measured on the hot-end component; turning on the high-pressure gas source; adjusting the pressure reducing valve to allow cleaned high-pressure protective gas to enter measuring probe one and measuring probe two through high-pressure gas pipeline one and high-pressure gas pipeline two, respectively, via one-way valve one and one-way valve two, from high-pressure protective gas inlet one and high-pressure protective gas inlet two, with the pressure monitored by a pressure sensor; the optical signal radiated by the hot-end component is collected by measuring probe one and measuring probe two, transmitted through optical fiber bundle one and optical fiber bundle two, combined into optical fiber bundle three, and then sequentially passed through a lens group and a filter, finally reaching the area of ​​the area array detector. Imaging is performed on regions one and two. The area array detector converts the optical signal into an electrical signal, which is transmitted to a remote industrial control computer via a network cable. The remote industrial control computer performs correction based on the pre-stored blackbody calibration curve and the emissivity data measured by thermocouples. It calculates and displays the temperature distribution of the hot end component in the regions corresponding to measurement probe one and measurement probe two. Thermocouples are placed on the surface of the hot end component, and their measurements are used to correct the surface emissivity. During system initialization, the image point position of each fiber in fiber bundle one on region one of the area array detector, and the image point position of each fiber in fiber bundle two on region two are pre-calibrated and stored. In high-temperature environments, the water cooling component is activated, and cooling water is injected through the cooling water inlet and flows out from the cooling water outlet.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. By adopting a fiber bundle splitting and combining transmission structure, measurement probe one and measurement probe two collect spectral signals from different regions respectively, and after transmission through fiber bundle one and fiber bundle two, they are combined into fiber bundle three, which is finally received and processed synchronously by a single area array detector. This achieves the effect of synchronous temperature distribution measurement in multiple regions with a single core detection system, effectively overcoming the problems of high cost and limited installation space in traditional multi-infrared thermal imager solutions.

[0014] 2. By integrating a high-pressure protective gas system with an optional modular water-cooling structure, a clean gas path consisting of a high-pressure gas source, pressure reducing valve, filter, and check valve is used to continuously supply protective gas at a pressure higher than the probe's operating environment to both high-pressure protective gas inlet 1 and high-pressure protective gas inlet 2. Cooling water can be circulated through the cooling water inlet and outlet, achieving a dual protection effect of effective anti-contamination and active cooling for the internal optical path of the measurement probe in a high-temperature and high-pressure gas environment, significantly improving the probe's environmental adaptability and service life.

[0015] 3. By adopting a method of regional fiber arrangement and pre-calibrated image point mapping, independent imaging regions of region one and region two are formed on the target surface of the area array detector using fiber bundle one and fiber bundle two, respectively. During the system initialization stage, the image point position corresponding to each fiber one and fiber two is pre-calibrated, which achieves the effect of spatial separation and accurate source tracing of multiple optical signals on a single detector. Thus, while ensuring the accuracy of temperature distribution measurement, a compact and low-cost system architecture is realized.

[0016] 4. By combining non-contact optical measurement with contact thermocouple calibration, the area temperature distribution is measured using measurement probe one and measurement probe two. In addition, real-time emissivity correction is performed using thermocouples placed on the surface of the hot end component. This achieves the effect of obtaining the temperature distribution characteristics of the entire field while effectively improving the absolute temperature measurement accuracy, thus balancing measurement efficiency and data reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fiber bundle distribution of the present invention; Figure 3 This is a schematic diagram of the flange and probe of the present invention; Figure 4 This is a schematic diagram of the thread and probe of the present invention; Figure 5 This is a schematic diagram of the water-cooled probe of the present invention.

[0018] In the diagram: 1. Hot end component; 2. Measurement probe one; 3. Measurement probe two; 4. Fiber optic bundle one; 5. Fiber optic bundle two; 6. Fiber optic bundle three; 7. Lens group; 8. Filter; 9. Area array detector; 10. Network cable; 11. Remote industrial control computer; 12. High-pressure protective gas inlet one; 13. High-pressure protective gas inlet two; 14. One-way valve one; 15. One-way valve two; 16. High-pressure gas pipeline one; 17. High-pressure gas pipeline two; 18. Pressure sensor; 19. Filter; 20. Pressure reducing valve; 21. High-pressure gas source; 22. Area one; 23. Fiber optic cable one; 24. Area two; 25. Fiber optic cable two; 26. Fiber optic interface; 27. Achromatic lens group; 28. Flange; 29. ​​Optical guide tube; 30. Internal thread; 31. C-type sealing structure; 32. Cooling water inlet; 33. Cooling water outlet. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1

[0021] Reference Figure 1 As an embodiment of the present invention, this embodiment provides a device and method for synchronously measuring the temperature distribution of multiple regions of a hot-end component, including a hot-end component 1 and a measuring probe 2 and a measuring probe 3 for synchronously measuring different regions of the hot-end component 1. An optical fiber bundle 4 is connected to the measuring probe 2, and an optical fiber bundle 5 is connected to the measuring probe 3. The optical fiber bundle 4 and the optical fiber bundle 5 are combined to form an optical fiber bundle 6. A lens group 7 and a filter 8 are sequentially arranged in the optical path at the rear end of the optical fiber bundle 6 to guide the optical signal to a surface array detector 9. The surface array detector 9 communicates with a remote industrial control computer 11 through a network cable 10.

[0022] Reference Figure 1 Measurement probe 12 is equipped with a high-pressure protective gas inlet 12, and measurement probe 23 is equipped with a high-pressure protective gas inlet 23. The high-pressure protective gas inlet 12 is connected to the high-pressure gas pipeline 16, and the high-pressure protective gas inlet 23 is connected to the high-pressure gas pipeline 27. The high-pressure gas pipeline 16 and the high-pressure gas pipeline 27 are connected to the high-pressure gas source 21.

[0023] Reference Figure 1 One-way valve 14 is installed on high-pressure gas pipeline 16, and one-way valve 15 is installed on high-pressure gas pipeline 27. A pressure reducing valve 20, a filter 19 and a pressure sensor 18 are also installed in sequence on the pipeline downstream of high-pressure gas source 21.

[0024] Reference Figure 1 , Figure 2 and Figure 3 The fiber bundle 6 images onto the target surface of the area array detector 9 as region 1 22 and region 2 24. Region 1 22 is composed of multiple fibers 1 23, and region 2 24 is composed of multiple fibers 2 25. Both measurement probe 1 2 and measurement probe 2 3 are equipped with achromatic lens groups 27 and have fiber optic interfaces 26 for connecting the fiber bundle.

[0025] Reference Figure 1 , Figure 3 and Figure 4 Measurement probe 1 2 and measurement probe 2 3 are installed and sealed using flange 28. The front end of measurement probe 1 2 and measurement probe 2 3 is equipped with optical guide tube 29. In a confined space, measurement probe 1 2 and measurement probe 2 3 are installed using internal thread 30 and sealed using C-type sealing structure 31.

[0026] Reference Figure 1 , Figure 4 and Figure 5 When the wall temperature at the installation location is high, both measuring probe 2 and measuring probe 3 are covered with water-cooled components. The water-cooled components are equipped with a cooling water inlet 32 ​​and a cooling water outlet 33 to protect the internal achromatic lens group 27 and fiber optic interface 26 with circulating cooling water.

[0027] Reference Figures 1-5 According to another aspect of this application, this application also provides a measurement method using the above-mentioned measuring device. The measurement method includes the following measurement steps: Positioning measuring probe 2 and measuring probe 3 at different areas to be measured on the hot-end component 1; turning on the high-pressure gas source 21; adjusting the pressure reducing valve 20; allowing cleaned high-pressure protective gas to enter measuring probe 2 and measuring probe 3 through high-pressure gas pipeline 16 and high-pressure gas pipeline 17, respectively, via check valve 14 and check valve 25, from high-pressure protective gas inlet 12 and high-pressure protective gas inlet 23; and having the pressure monitored by pressure sensor 18; the light signal radiated by the hot-end component 1 is collected by measuring probe 2 and measuring probe 3, transmitted through fiber bundle 4 and fiber bundle 5, combined into fiber bundle 3 6, and then sequentially passed through lens group 7 and filter 8, finally reaching the area of ​​the surface array detector 9. Imaging is performed on region 22 and region 24. The area array detector 9 converts the optical signal into an electrical signal and transmits it to the remote industrial control computer 11 via network cable 10. The remote industrial control computer 11 performs correction based on the pre-stored blackbody calibration curve and the emissivity data measured by thermocouples. It calculates and displays the temperature distribution of the hot end component 1 in the regions corresponding to the measurement probes 2 and 3. Thermocouples are set on the surface of the hot end component 1, and their measured values ​​are used to correct the surface emissivity. During system initialization, the image point positions of each fiber 23 in fiber bundle 4 on region 22 of the area array detector 9 and the image point positions of each fiber 25 in fiber bundle 5 on region 24 are pre-calibrated and stored. In high-temperature environments, the water cooling component is activated, and cooling water is injected through the cooling water inlet 32 ​​and flows out from the cooling water outlet 33.

[0028] A method for synchronously measuring the temperature distribution in multiple regions of a hot-end component includes the following steps: S1: Install the measuring probes, and align measuring probe 1 (2) and measuring probe 2 (3) with the different areas to be measured on the hot end component 1 respectively; S2: Start the protective gas system, turn on the high-pressure gas source 21, adjust the pressure reducing valve 20, so that the high-pressure protective gas after being cleaned by the filter 19 passes through the high-pressure gas pipeline 16 and the high-pressure gas pipeline 27 respectively, and passes through the check valve 14 and the check valve 25 in sequence, and enters the measuring probe 12 and the measuring probe 23 from the high-pressure protective gas inlet 12 and the high-pressure protective gas inlet 23. The inlet pressure is monitored in real time by the pressure sensor 18. S3: Start the cooling system. In a high-temperature environment, start the water-cooled components and inject cooling water into the water-cooled components of measuring probe 1 2 and measuring probe 2 3 through the cooling water inlet 32. After the cooling water circulates, it flows out from the cooling water outlet 33. S4: Acquire optical signals. The optical signals radiated from the surface of the hot end component 1 are collected by measurement probe 1 2 and measurement probe 2 3, and transmitted through fiber bundle 1 4 and fiber bundle 2 5 respectively, and combined into fiber bundle 3 6. S5: Processing optical signals. The optical signals of fiber bundle 36 are converged by lens group 7 and filtered by filter 8 in sequence, and then imaged on the target surface of area array detector 9 in region 1 22 and region 2 24 respectively. S6: Signal conversion and transmission. The area array detector 9 converts the received optical signal into an electrical signal and transmits it to the remote industrial control computer 11 via the network cable 10. S7: Temperature calculation and display. The remote industrial control computer 11 calls the pre-stored blackbody calibration curve, combines it with the emissivity correction data obtained by thermocouple measurement, calculates and synchronously displays the temperature distribution of the hot end component 1 in the corresponding areas of measuring probe 1 2 and measuring probe 2 3. S8: System calibration preparation. During the system initialization phase, the image point positions of each fiber 23 in fiber bundle 4 on region 22 of the area array detector 9, and the image point positions of each fiber 25 in fiber bundle 5 on region 24 are pre-calibrated and stored.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for synchronously measuring the temperature distribution in multiple regions of a hot-end component, characterized in that: The device includes a hot-end component (1) and two measuring probes (2 and 3) for synchronously measuring different areas of the hot-end component (1). One measuring probe (2) is connected to an optical fiber bundle (4), and another optical fiber bundle (5) is connected to the measuring probe (3). The first optical fiber bundle (4) and the second optical fiber bundle (5) are combined to form a third optical fiber bundle (6). A lens group (7) and a filter (8) are sequentially arranged at the rear optical path of the third optical fiber bundle (6) to guide the optical signal to the area array detector (9). The array detector (9) communicates with a remote industrial control computer (11) via a network cable (10); the first measuring probe (2) is provided with a high-pressure protective gas inlet (12), and the second measuring probe (3) is provided with a high-pressure protective gas inlet (13). The first high-pressure protective gas inlet (12) is connected to the first high-pressure gas pipeline (16), and the second high-pressure protective gas inlet (13) is connected to the second high-pressure gas pipeline (17). The first high-pressure gas pipeline (16) and the second high-pressure gas pipeline (17) are connected to the high-pressure gas pipeline. Source (21); One-way valve (14) and pressure sensor (18) are installed on the first high-pressure gas pipeline (16), and one-way valve (15) and pressure sensor (18) are installed on the second high-pressure gas pipeline (17). A pressure reducing valve (20) and filter (19) are also installed in sequence on the pipeline downstream of the high-pressure gas source (21); The third fiber bundle (6) is imaged on the target surface of the area array detector (9) as region one (22) and region two (24). Region one (22) is composed of multiple optical fibers (14, 25, 24, 25, 26, 27, 28, 29 ... 23) The region two (24) is composed of multiple optical fibers two (25); the measuring probe one (2) and the measuring probe two (3) are both equipped with an achromatic lens group (27) and are provided with an optical fiber interface (26) for connecting the optical fiber bundle; the measuring probe one (2) and the measuring probe two (3) are both covered with a water-cooling component, which is provided with a cooling water inlet (32) and a cooling water outlet (33) for circulating cooling water to protect the internal achromatic lens group (27) and optical fiber interface (26).

2. The multi-region temperature distribution synchronous measurement device for hot-end components according to claim 1, characterized in that: The first measuring probe (2) is installed and sealed using a flange (28). The front optical component of the first measuring probe (2) is probe one (29). The second measuring probe (3) is installed using an internal thread (30). The front optical component of the second measuring probe (3) is probe two (31), and a C-type sealing structure is used to achieve sealing.

3. A method for synchronously measuring the temperature distribution in multiple regions of a hot-end component, characterized in that: The measuring device as described in any one of claims 1 to 2 includes the following steps: aligning measuring probe one (2) and measuring probe two (3) with different areas to be measured on the hot end component (1), turning on the high-pressure gas source (21), adjusting the pressure reducing valve (20), so that the cleaned high-pressure protective gas enters measuring probe one (2) and measuring probe two (3) through high-pressure gas pipeline one (16) and high-pressure gas pipeline two (17), respectively through one-way valve one (14) and one-way valve two (15), from high-pressure protective gas inlet one (12) and high-pressure protective gas inlet two (13), and the pressure is monitored by the pressure sensor (18). The light signal radiated by the hot end component (1) is collected by measuring probe one (2) and measuring probe two (3), transmitted through fiber bundle one (4) and fiber bundle two (5), and after being bundled into fiber bundle three (6), it passes through lens group (7) and filter (8) in sequence, and finally in area one (22) and area two of the surface array detector (9). Imaging is performed on region 2 (24). The area array detector (9) converts the optical signal into an electrical signal and transmits it to the remote industrial control computer (11) via the network cable (10). The remote industrial control computer (11) corrects the emissivity data measured by the thermocouple based on the pre-stored blackbody calibration curve. It then calculates and displays the temperature distribution of the hot end component (1) in the regions corresponding to the measurement probe one (2) and measurement probe two (3). Thermocouples are set on the surface of the hot end component (1) and their measured values ​​are used to correct the surface emissivity. During system initialization, the image point position of each fiber one (23) in fiber bundle one (4) on region 1 (22) of the area array detector (9) and the image point position of each fiber two (25) in fiber bundle two (5) on region 2 (24) are pre-calibrated and stored. In high-temperature environments, the water cooling component is activated, and cooling water is injected through the cooling water inlet (32) and flows out from the cooling water outlet (33).

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