Space plane temperature measurement system based on infrared thermal imaging and testing method

Abstract

The invention discloses a space plane temperature measurement system based on infrared thermal imaging and a test method, and relates to the technical field of aero-engines. The device comprises a combustion temperature measurement test object (1), a temperature measurement displacement mechanism (2), a thermal infrared imager (3) and data acquisition equipment (4). Wherein the temperature measurement displacement mechanism (2) is arranged on the combustion temperature measurement test object (1). The advantages of contact type measurement and non-contact type measurement are combined, measurement of a large-range and high-precision temperature field is achieved through cooperation of the thermal infrared imager and the temperature measurement displacement mechanism, and meanwhile the measurement precision is improved through calibration of the contact type sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and more particularly to a spatial plane temperature measurement system and a testing method based on infrared thermal imaging. Background Art

[0002] The combustion chamber and turbine are the core high-temperature components of aircraft engines. Improper coupling between the combustion chamber and the turbine will cause local overheating or fatigue damage to the turbine blades, which will greatly affect the service life of the turbine blades. As the combustion chamber develops towards the goal of high temperature rise, short ring and compactness, the combustion chamber outlet temperature further increases, which puts higher requirements on the turbine blade cooling design. Understanding the actual temperature distribution of the combustion chamber outlet through testing is conducive to the fine control of the cooling design, thereby shortening the test cycle and reducing the development cost of the engine.

[0003] Existing combustion chamber outlet temperature distribution tests can be divided into contact measurement and non-contact measurement methods. The contact measurement method is mainly measured by thermocouples, which has the advantages of high measurement accuracy and strong reliability. The thermocouple obtains the temperature of the specified measurement position through a fixed rake, but the fixed rake generally has limited measurement points, and the obtained combustion chamber outlet temperature field has a low spatial resolution. At the same time, its size is large and faces temperature resistance challenges. It is not suitable for combustion chamber outlet tests with turbine guide vanes; in addition, the thermocouple is driven by a displacement mechanism to scan the test plane. This method has a relatively higher spatial resolution than the former, but because it needs to be scanned in both radial and circumferential directions and needs to wait for the thermocouple to be thermally balanced, its test time is longer, which tests the reliability of the test system. Non-contact measurement methods are mainly divided into radiation measurement and spectral measurement methods. The radiation measurement method is based on the relationship between solid radiation and temperature. The solid wall temperature is obtained by calibrating an infrared radiation detector, but it is not suitable for spatial plane measurements. The spectral measurement method establishes a relationship with temperature by specifying the main characteristic changes in the absorption or luminescence spectrum of the component at different temperatures. For spatial plane measurements, it is necessary to set up a laser emitting end and a receiving end, and an optical test window. It has strict optical test environment requirements and is costly, making it difficult to apply in engineering.

[0004] Therefore, it is an urgent problem for those skilled in the art to propose a spatial plane temperature measurement system and a testing method based on infrared thermal imaging to solve the difficulties existing in the prior art. Summary of the invention

[0005] In view of this, the present invention provides a spatial plane temperature measurement system and a testing method based on infrared thermal imaging, which can obtain the temperature distribution of the measurement space plane with high resolution.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A spatial plane temperature measurement system based on infrared thermal imaging comprises: a combustion temperature measurement test object, a temperature measurement displacement mechanism, an infrared thermal imager, and a data acquisition device; wherein the temperature measurement displacement mechanism is arranged on the combustion temperature measurement test object.

[0008] Optionally, the combustion temperature measurement test object includes: a combustion chamber swirler, a combustion chamber side quartz observation window, a combustion chamber flame tube plate, and a combustion chamber downstream turbine guide vane; wherein, the combustion temperature measurement test object is based on the combustion chamber, the combustion chamber swirler is arranged at the front end of the combustion chamber flame tube plate, the combustion chamber side quartz observation window is arranged on the side wall of the combustion chamber flame tube plate, and the combustion chamber downstream turbine guide vane is arranged at the rear end of the combustion chamber flame tube plate.

[0009] Optionally, the combustion temperature measurement test object includes an invasive test interface and a side observation window.

[0010] Optionally, the temperature measurement displacement mechanism includes: a multi-point temperature measurement probe, a test plane, a motor and a horizontal one-dimensional motion transmission device, and the multi-point temperature measurement probe is driven by the horizontal one-dimensional motion transmission device to scan the test plane.

[0011] Optionally, the temperature measurement displacement mechanism sets a multi-point temperature measurement probe on the test plane through an invasive test interface.

[0012] Optionally, the infrared thermal imager is fixed by a camera bracket, and adopts a near-infrared band. The infrared thermal imager observes the test plane area and the multi-point temperature measurement probes through a side observation window of the combustion temperature measurement test object.

[0013] Optionally, the data acquisition device is a computer.

[0014] A spatial plane testing method based on infrared thermal imaging, executing any of the above-mentioned spatial plane temperature measurement systems based on infrared thermal imaging, comprises the following steps:

[0015] During the test, the infrared thermal imager recording function is first turned on. The multi-point temperature measuring probe is controlled by a motor to intermittently move along the same horizontal direction from one side of the test area. The distance of each movement is determined according to the horizontal spatial resolution of the temperature distribution. After a single movement, the multi-point temperature measuring probe is paused to wait for thermal equilibrium. When the thermocouple moves out of the test plane, the test ends, and the infrared thermal imager recording is terminated and saved.

[0016] The temperature distribution of the thermocouple surface in the vertical direction in the infrared thermal imager results is calibrated by using the thermocouple temperature measurement results. The temperature value of the infrared thermal imager is calibrated by associating the time-series thermocouple temperature measurement point data with the thermal imaging image of the infrared thermal imager and using the data of the thermocouple temperature measurement point position at the moment of reaching thermal equilibrium.

[0017] The movement position of the temperature measuring displacement mechanism is associated with the temperature data of the calibrated infrared thermal imager through time series. According to the temperature data of the infrared thermal imager in the horizontal and vertical directions when the temperature measuring displacement mechanism moves to the moment of reaching thermal equilibrium, the two-dimensional temperature distribution of the test plane is obtained by linear interpolation.

[0018] Optionally, the specific content of linear interpolation is: first, obtain the change results of the surface temperature of the multi-point temperature measuring probe obtained by the infrared thermal imager during the movement of the temperature measuring displacement mechanism, and fit a two-dimensional polynomial through the horizontal position change and temperature change according to the same vertical height, which is used as the interpolation formula of the position during the movement. Use the optimized interpolation formula to obtain the two-dimensional temperature distribution of the test plane.

[0019] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a spatial plane temperature measurement system and a test method based on infrared thermal imaging, which have the following beneficial effects:

[0020] 1) Combining the advantages of contact measurement and non-contact measurement, the infrared thermal imager and the temperature measurement displacement mechanism are used to measure the temperature field in a large range and with high precision. At the same time, the contact sensor is calibrated to improve the measurement accuracy.

[0021] 2) This method can not only effectively shorten the measurement time, but also provide a higher spatial resolution. In addition, the method of the present invention can be applied to a quartz glass observation window without the need to establish a complex optical window. It is suitable for complex engineering application environments and has a high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A structural diagram of a spatial plane temperature measurement system based on infrared thermal imaging provided by the present invention;

[0024] Figure 2 A schematic diagram of the local structure of a spatial plane temperature measurement system based on infrared thermal imaging provided by the present invention;

[0025] Figure 3 A flow chart of a spatial plane temperature testing method based on infrared thermal imaging provided by the present invention;

[0026] Among them, 1-combustion temperature measurement test object, 2-temperature measurement displacement mechanism, 3-infrared thermal imager, 4-data acquisition equipment, 11-combustion chamber swirler, 12-combustion chamber side quartz observation window, 13-combustion chamber flame tube plate, 14-combustion chamber downstream turbine guide vane, 25-multi-point temperature measurement probe, 26-test plane. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 As shown, the present invention discloses a spatial plane temperature measurement system based on infrared thermal imaging, comprising: a combustion temperature measurement test object 1, a temperature measurement displacement mechanism 2, an infrared thermal imager 3, and a data acquisition device 4; wherein the temperature measurement displacement mechanism 2 is arranged on the combustion temperature measurement test object 1.

[0029] For further information, see Figure 2 As shown, the combustion temperature measurement test object 1 includes: a combustion chamber swirler 11, a combustion chamber side quartz observation window 12, a combustion chamber flame tube plate 13, and a combustion chamber downstream turbine guide vane 14; wherein, the combustion temperature measurement test object 1 is based on the combustion chamber, the combustion chamber swirler 11 is arranged at the front end of the combustion chamber flame tube plate 13, the combustion chamber side quartz observation window 12 is arranged on the side wall of the combustion chamber flame tube plate 13, and the combustion chamber downstream turbine guide vane 14 is arranged at the rear end of the combustion chamber flame tube plate 13.

[0030] Furthermore, the combustion temperature measurement test object 1 includes an invasive test interface and a side observation window.

[0031] Furthermore, the temperature measurement displacement mechanism 2 includes: a multi-point temperature measurement probe 25, a test plane 26, a motor and a horizontal one-dimensional motion transmission device, and the multi-point temperature measurement probe 25 is driven by the horizontal one-dimensional motion transmission device to scan the test plane 26.

[0032] Specifically, the temperature measuring displacement mechanism 2 has a water cooling structure and a sealing structure.

[0033] Furthermore, the temperature measurement displacement mechanism 2 sets the multi-point temperature measurement probe 25 on the test plane 26 through an invasive test interface.

[0034] Specifically, the test plane 26 is located at the interface plane between the combustion chamber and the turbine guide vanes downstream of the combustion chamber.

[0035] Specifically, the temperature measurement displacement mechanism 2 is fixed on the invasive test interface of the combustion temperature measurement test object 1, and the multi-point temperature measurement probe 25 is located on the test plane 26. The length of the multi-point temperature measurement probe 25 is long enough to cover the vertical direction of the entire test plane 26; the combustion temperature measurement test object 1 reaches and can maintain a stable working condition for a long time, and at the same time, there is no high concentration of water vapor or chemical spontaneous luminescence interference in the test plane 26.

[0036] Furthermore, the infrared thermal imager 3 is fixed by a camera bracket and uses a near-infrared band. The infrared thermal imager 3 observes the test plane 26 area and the multi-point temperature measurement probe 25 through the side observation window of the combustion temperature measurement test object 1.

[0037] Furthermore, the data acquisition device 4 is a computer.

[0038] and Figure 1 Corresponding to the method described above, the present invention also provides a spatial plane testing method based on infrared thermal imaging, which is used to Figure 1 The specific implementation of the system in the method flow chart is shown in Figure 3 As shown, the following steps are included:

[0039] The test process first turns on the recording function of the infrared thermal imager 3, and controls the multi-point temperature measuring probe 25 to intermittently move along the same horizontal direction from one side of the test area through the motor. The distance of each movement is determined according to the horizontal spatial resolution of the temperature distribution. After a single movement, a pause is made to wait for the multi-point temperature measuring probe 25 to achieve thermal equilibrium. When the thermocouple moves out of the range of the test plane 26, the test ends, and the recording of the infrared thermal imager 3 is terminated and saved;

[0040] The temperature distribution in the vertical direction of the thermocouple surface in the infrared thermal imager 3 result is calibrated by the thermocouple temperature measurement result, and the temperature value of the infrared thermal imager 3 is calibrated by associating the time series thermocouple temperature measurement point data with the thermal imaging image of the infrared thermal imager 3, and using the data of the thermocouple temperature measurement point position at the moment of reaching thermal equilibrium;

[0041] The movement position of the temperature measuring displacement mechanism 2 is associated with the temperature data of the calibrated infrared thermal imager 3 through time sequence, and the two-dimensional temperature distribution of the test plane 26 is obtained by linear interpolation based on the temperature data of the infrared thermal imager 3 in the horizontal and vertical directions when the temperature measuring displacement mechanism 2 moves to when thermal equilibrium is reached.

[0042] Furthermore, the specific content of linear interpolation is: first, the change result of the surface temperature of the multi-point temperature measuring probe 25 obtained by the infrared thermal imager 3 during the movement of the temperature measuring displacement mechanism 2 is obtained, and according to the same vertical height, a two-dimensional polynomial is fitted through the horizontal position change and the temperature change, which is used as the interpolation formula of the position during the movement, and the two-dimensional temperature distribution of the test plane 26 is obtained by using the optimized interpolation formula.

[0043] Specifically, a two-dimensional temperature distribution of the test plane 26 with the highest resolution and the highest accuracy is finally obtained.

[0044] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spatial plane temperature measurement system based on infrared thermal imaging, characterized in that: include: A combustion temperature measurement test object (1), a temperature measurement displacement mechanism (2), an infrared thermal imager (3), and a data acquisition device (4); wherein the temperature measurement displacement mechanism (2) is arranged on the combustion temperature measurement test object (1).

2. The spatial plane temperature measurement system based on infrared thermal imaging according to claim 1 is characterized in that: The combustion temperature measurement test object (1) comprises: a combustion chamber swirler (11), a combustion chamber side quartz observation window (12), a combustion chamber flame tube plate (13), and a combustion chamber downstream turbine guide vane (14); wherein the combustion temperature measurement test object (1) takes the combustion chamber as the main body, the combustion chamber swirler (11) is arranged at the front end of the combustion chamber flame tube plate (13), the combustion chamber side quartz observation window (12) is arranged on the side wall of the combustion chamber flame tube plate (13), and the combustion chamber downstream turbine guide vane (14) is arranged at the rear end of the combustion chamber flame tube plate (13).

3. The spatial plane temperature measurement system based on infrared thermal imaging according to claim 1 is characterized in that: The combustion temperature measurement test object (1) comprises an intrusive test interface and a side observation window.

4. The spatial plane temperature measurement system based on infrared thermal imaging according to claim 1 is characterized in that: The temperature measurement displacement mechanism (2) comprises: a multi-point temperature measurement probe (25), a test plane (26), a motor and a horizontal one-dimensional motion transmission device, and the multi-point temperature measurement probe (25) is driven by the horizontal one-dimensional motion transmission device to scan the test plane (26).

5. A spatial plane temperature measurement system based on infrared thermal imaging according to claim 3 or 4, characterized in that: The temperature measurement displacement mechanism (2) sets the multi-point temperature measurement probe (25) on the test plane (26) through an invasive test interface.

6. The spatial plane temperature measurement system based on infrared thermal imaging according to claim 4 is characterized in that: The infrared thermal imager (3) is fixed by a camera bracket and uses a near-infrared band. The infrared thermal imager (3) observes the test plane (26) area and the multi-point temperature measurement probe (25) through a side observation window of the combustion temperature measurement test object (1).

7. The spatial plane temperature measurement system based on infrared thermal imaging according to claim 1 is characterized in that: The data acquisition device (4) is a computer.

8. A spatial plane testing method based on infrared thermal imaging, characterized in that A spatial plane temperature measurement system based on infrared thermal imaging as described in any one of claims 1 to 7 is applied, comprising the following steps: The test process first turns on the recording function of the infrared thermal imager (3), and controls the multi-point temperature measuring probe (25) to intermittently move along the same horizontal direction from one side of the test area through a motor. The distance of each movement is determined according to the horizontal spatial resolution of the temperature distribution. After a single movement, a pause time is paused to wait for the multi-point temperature measuring probe (25) to achieve thermal equilibrium. When the thermocouple moves out of the range of the test plane (26), the test ends, and the recording of the infrared thermal imager (3) is terminated and saved; The temperature distribution in the vertical direction of the thermocouple surface in the infrared thermal imager (3) result is calibrated by using the thermocouple temperature measurement result, by associating the time series thermocouple temperature measurement point data with the thermal imaging image of the infrared thermal imager (3), and using the data of the thermocouple temperature measurement point position at the moment of reaching thermal equilibrium to calibrate the temperature value of the infrared thermal imager (3); The movement position of the temperature measuring displacement mechanism (2) is associated with the temperature data of the calibrated infrared thermal imager (3) through a time sequence, and the two-dimensional temperature distribution of the test plane (26) is obtained by linear interpolation based on the temperature data of the infrared thermal imager (3) in the horizontal and vertical directions to which the temperature measuring displacement mechanism (2) moves when thermal equilibrium is reached.

9. According to the spatial plane testing method based on infrared thermal imaging described in claim 8, the specific content of the linear interpolation is: first, the change result of the surface temperature of the multi-point temperature measuring probe (25) obtained by the infrared thermal imager (3) during the movement of the temperature measuring displacement mechanism (2) is obtained, and according to the same vertical height, a two-dimensional polynomial is fitted through the horizontal position change and the temperature change, which is used as the interpolation formula of the position during the movement, and the two-dimensional temperature distribution of the test plane (26) is obtained using the optimized interpolation formula.

Images