A double-tube hemispherical head total temperature probe with side slots

Abstract

The present invention relates to the field of total temperature testing of airflow, and discloses a double-tube hemispherical head total temperature probe with side slots, including an outer sleeve, an inner sleeve, a temperature sensor, a heat-insulating seal and a probe support rod. The inner and outer sleeves are both hollow cylinders with hemispherical heads, forming a double-tube structure. The temperature sensor is located inside the inner sleeve and fixed on the heat-insulating seal. The inner and outer sleeves are respectively provided with four straight grooves extending from the sleeve side wall to the end hemispherical head, which are at an angle of 90° to each other. The outer sleeve straight grooves and the inner sleeve straight grooves are at an angle of 45° to each other. Exhaust holes are provided on the inner and outer sleeves, and a temperature measuring hole is provided on the outer sleeve. The present invention can reduce the damage of thermal radiation and airflow impact to the temperature sensor, improve the total temperature measurement accuracy, increase the airflow insensitivity angle of total temperature measurement, and the opening can be adaptively inlet and outlet. The present invention can be used for total temperature measurement in high-temperature environments such as gas turbines and aircraft engines, turbine interstages, turbine inlets and outlets, and combustion chambers.

Description

Technical Field

[0001] The present invention relates to the technical field of total airflow temperature measurement, and in particular to a total temperature probe with a double-sleeve hemispherical head and a side slot, which is used for total temperature measurement in high temperature environments such as gas turbines and aircraft engines, turbine interstages, turbine inlets and outlets, and combustion chambers. Background Art

[0002] In the field of gas turbine and aircraft engine temperature measurement, the measurement of airflow temperature is generally the total airflow temperature measurement, that is, the temperature that the airflow can reach in the state of absolute stagnation. In the actual measurement process, it is difficult to achieve complete absolute stagnation. When measuring the total temperature of high-speed airflow, the speed error is large. Therefore, the temperature measured by the temperature probe is usually lower than the total airflow temperature. Most of the existing total temperature probes are single-layer stagnation covers, and single-layer stagnation is difficult to ensure the accuracy of temperature measurement.

[0003] The existing total temperature probe with stagnation cover can usually only play a single-layer shielding role, and the temperature sensing element of the total temperature probe is usually a fragile temperature measuring element such as a thermocouple. Even when the armored temperature sensor is measuring in a high-temperature flow field, the stagnation cover will have a strong radiation effect on the internal temperature sensor, shortening the service life of the temperature sensor. At the same time, in a high-temperature environment with a temperature above 300°C, the thermal radiation effect will make the temperature measurement result of the temperature sensor inaccurate. Although there are some total temperature probes with double-screen exhaust, they need to install a complex exhaust system, which increases the difficulty of probe installation and also increases the test cost.

[0004] During use, the existing total temperature probe requires the temperature sensor to be directly facing the incoming airflow. However, the temperature sensor is generally a fragile temperature measuring element such as a thermocouple, which is easily impacted by the high-temperature airflow and causes damage to the temperature sensor. This also means that this type of total temperature probe cannot be used in high-temperature and high-speed airflow testing situations.

[0005] The flow field inside an aircraft engine is highly three-dimensional and non-steady. For example, the flow field characteristics at the turbine rotor outlet are affected by multiple factors such as rotation speed and inlet pressure. Therefore, the airflow direction inside an aircraft engine changes dramatically. Some total temperature probes increase the insensitive angle of the airflow by chamfering the end of the stagnation hood, but the range of increasing the insensitive angle is also limited. Therefore, the temperature sensing head is more sensitive to the deviation of the airflow direction. When the airflow direction changes more dramatically, the temperature measurement error is larger.

[0006] The existing total temperature probe technology with a stagnation cover has the following shortcomings: 1. The existing total temperature probe with a stagnation cover can only achieve single-layer stagnation, and insufficient airflow stagnation leads to measurement errors. 2. When measuring high-temperature flow fields, the stagnation cover of the total temperature probe with a single-layer stagnation cover will have a strong radiation effect on the temperature sensor, shortening the service life of the probe and causing inaccurate measurement results. 3. The existing total temperature probes mostly use the method of chamfering the end of the stagnation cover to increase the insensitive angle of the airflow. The range of increasing the insensitive angle is limited, and the temperature sensing head is very sensitive to the deviation of the airflow direction. When the airflow direction changes more drastically, the temperature measurement error is large, which has obvious limitations for the measurement of the internal flow field of the aircraft engine. 4. The temperature sensor in the traditional total temperature probe will be impacted by the airflow during the measurement process, shortening the service life of the temperature sensor. 5. The existing double-screen exhaust total temperature probe needs to install a complex exhaust system, which increases the difficulty of installation and increases the test cost. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a double-sleeve hemispherical head total temperature probe with side slots, which aims to solve the problems of large temperature measurement error caused by insufficient stagnation during the current total temperature test of airflow, small insensitive angle range of airflow measurement, short life of temperature sensor caused by radiation from the stagnation cover in high temperature environment, inaccurate measurement results and serious impact of airflow on the temperature sensor. In the present invention, the double-layer sleeve structure can not only fully stagnate the airflow, but also play a double-layer shielding role. The slot positions on the inner and outer sleeves are at a certain angle to each other, which is conducive to forming an airflow layer between the inner and outer sleeves, thereby weakening the radiation effect of the airflow on the temperature sensor; the end hemispherical head structure and the side slots greatly expand the insensitive angle range of the airflow measured by the temperature sensing head; the end double-layer hemispherical head structure can prevent the airflow from directly impacting the temperature sensor; the exhaust holes opened on the walls of the inner and outer sleeves are set as inclined holes, which are conducive to the discharge of airflow, thereby promoting convective heat exchange, ensuring the accuracy of probe measurement, and improving the frequency response of the probe; the intake and exhaust hole structure set according to the aerodynamic principle can realize the self-adaptation of intake and exhaust, without the need for a complex exhaust system, and the probe installation is more convenient.

[0008] In order to solve the above technical problems, the present invention provides a side-grooved double-sleeve hemispherical head total temperature probe, which is characterized in that it includes an outer sleeve (1), an inner sleeve (2), a temperature sensor (3), an insulating seal (4) and a probe support rod (5), wherein the inner sleeve (2) is located on the inner side of the outer sleeve (1) to form a double-sleeve structure, and the temperature sensor (3) is located inside the inner sleeve and fixed on the insulating seal (4).

[0009] Furthermore, the outer sleeve (1) and the inner sleeve (2) are both hollow cylindrical ends connected to a hemispherical head structure, and a straight groove (7) and a straight groove (8) are respectively opened on the side circumference, and the four straight grooves on each sleeve form an angle of 90° with each other, and the four straight grooves (7) of the outer sleeve (1) and the four straight grooves (8) of the inner sleeve (2) differ by 45°.

[0010] Furthermore, the length of the straight groove (7) on the cylindrical side of the outer sleeve (1) is 0.8 to 1.0 times the outer diameter of the outer sleeve (1), and the width is 1 / 8 of the outer diameter of the outer sleeve (1). The projected length of the straight groove (7) on the hemispherical head structure at the end of the outer sleeve (1) in the left view is 1 / 6 to 1 / 4 times the outer diameter of the hemispherical head structure; the length of the straight groove (8) on the cylindrical side of the inner sleeve (2) is 0.8 to 1.0 times the outer diameter of the inner sleeve (2), and the width is 1 / 8 of the outer diameter of the inner sleeve (2). The projected length of the straight groove (8) on the hemispherical head structure at the end of the inner sleeve (1) in the left view is 1 / 6 to 1 / 4 times the outer diameter of the hemispherical head structure.

[0011] Furthermore, the outer sleeve (1) and the inner sleeve (2) are both hollow cylinders with hemispherical head end structures, the diameter of the hollow cylindrical part of the inner sleeve (2) is 2 to 8 mm, the diameter of the hollow cylindrical part of the outer sleeve (1) is 1.1 to 1.2 times the diameter of the inner sleeve (2), the wall thickness of the outer sleeve (1) and the inner sleeve (2) are both 0.1 to 1 mm, the diameter of the probe support rod (5) is the same as the outer diameter of the outer sleeve (1), and the probe support rod (5) can be "I"-shaped or "L"-shaped.

[0012] Furthermore, the length of the inner sleeve (2) is smaller than that of the outer sleeve (1), and the distance from the inner sleeve (2) to the end of the outer sleeve (1) is 0.1 to 0.2 times the length of the outer sleeve (1).

[0013] Furthermore, a circular temperature measuring hole (9) is provided on the hemispherical head structure at the end of the outer sleeve (1), the center line of which is colinear with the axis of the sleeve, and the diameter of the temperature measuring hole (9) is 1 / 3 to 1 / 2 times the outer diameter of the hollow cylindrical part of the outer sleeve (1).

[0014] Furthermore, three exhaust holes (6) are respectively opened in the same direction of two straight grooves (7) on the outer sleeve (1) that form an angle of 180° with each other, the diameter of the exhaust hole is 0.5-2 mm, the angle between the exhaust hole (6) and the axial direction of the outer sleeve (1) is 45°, the three exhaust holes (6) are located at the same circumferential position and are evenly distributed along the axial direction, and the distance between two adjacent holes is 4-5 times the hole diameter, wherein the axial distance between the third exhaust hole and the glue sealing position between the two sleeves does not exceed 2 mm.

[0015] Furthermore, the exhaust holes (6) on the inner sleeve (2) have the same aperture and spacing as the exhaust holes (6) on the outer sleeve (1), and can be oriented in the same direction or at an angle of 90° to the exhaust holes (6) on the outer sleeve (1). The exhaust holes (6) on the inner sleeve (2) are overall closer to the temperature measuring holes than the exhaust holes (6) on the outer sleeve (1) by 0.5 to 1 times the spacing between the exhaust holes (6).

[0016] Furthermore, the temperature sensor (3) may be a thermocouple, a thermal resistor or an optical fiber temperature sensor.

[0017] The advantages and positive effects of the invention are:

[0018] Beneficial effect 1: Compared with the prior art, the double-layer sleeves in the double-sleeve hemispherical head total temperature probe with side grooves of the present invention can stop the airflow, which is beneficial to the full stagnation of the airflow and improves the temperature measurement accuracy; compared with the ordinary total temperature probe, the end hemispherical head structure can also accelerate the stagnation of the airflow, while reducing the impact of the airflow on the temperature sensor; the grooves of the inner and outer sleeve end hemispherical head structures are angled to each other, and the outer sleeve hemispherical head structure has a temperature measuring hole while the inner sleeve does not, which are all designs that are beneficial to the full stagnation of the airflow.

[0019] Beneficial effect 2: The double-sleeve hemispherical head total temperature probe with side grooves of the present invention adopts a double-layer sleeve structure. The inner sleeve can shield the radiation effect of the outer sleeve on the temperature sensor, thereby improving the accuracy of the temperature measurement result; the outer sleeve can shield the radiation of the external airflow to the inner sleeve, thereby weakening the thermal radiation effect on the temperature sensor, and improving the service life and measurement accuracy of the temperature sensor; the double-layer hemispherical head structure at the end avoids the direct impact of the airflow on the temperature sensor, further improving the service life of the probe. Compared with the prior art, the double-sleeve hemispherical head total temperature probe with side grooves of the present invention expands the temperature measurement range of the total temperature probe and can be used for total temperature measurement of higher temperature flow fields.

[0020] Beneficial effect three: Compared with the prior art, the double-tube structure in the side-grooved double-tube hemispherical head total temperature probe in the present invention has oblique exhaust holes at a certain angle on the double-tube, which is beneficial to form an airflow layer in the cavity between the double-tubes, and is beneficial to heat insulation and reducing the radiation effect of the outer tube on the inner tube and the temperature sensor. The present invention reasonably arranges the air inlet and exhaust holes of the inner and outer tubes according to the principles of aerodynamics, and can adaptively realize the air intake and exhaust of the airflow without a special exhaust system, thereby improving the convenience of installation of the test system.

[0021] Beneficial effect four: Compared with the prior art, the double-sleeve hemispherical head total temperature probe with side slots in the present invention, the hemispherical head structure at the end plus the slotted structure can realize the total temperature measurement under a very wide range of flow conditions, can greatly expand the insensitive angle range of temperature measurement, and can realize accurate measurement of the total temperature within the deflection angle range of -180° to 180° and the pitch angle range of -90° to 90°, thereby reducing the error of total temperature measurement.

[0022] The present invention has the following advantages: the double-sleeve structure can reduce the damage to the temperature sensor caused by thermal radiation and direct impact of airflow, can be used in high-temperature environments, and prolongs the service life of the temperature sensor. The double-layer shielding and stagnation improve the measurement accuracy of the total temperature probe. The holes can adaptively realize air intake and exhaust. The hemispherical head structure and the slots increase the airflow insensitivity angle measured by the total temperature probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front cross-sectional view of the structure of the probe embodiment 1 of the present invention.

[0024] Figure 2 It is a left view of the structure of the probe embodiment 1 of the present invention.

[0025] Figure 3 It is a schematic diagram of the AA cross-section of the structure of the probe embodiment 1 of the present invention.

[0026] Figure 4 It is a schematic diagram of the BB cross-section of the structure of the probe embodiment 1 of the present invention.

[0027] Figure 5 It is a CC cross-sectional schematic diagram of the structure of the probe embodiment 1 of the present invention.

[0028] Figure 6 It is a front cross-sectional view of the structure of the probe embodiment 2 of the present invention.

[0029] Figure 7 It is a left view of the structure of the probe embodiment 2 of the present invention.

[0030] Figure 8 It is a schematic diagram of the DD cross-section of the structure of the probe embodiment 2 of the present invention.

[0031] Fig. 9 It is a schematic diagram of the EE cross-section of the structure of the probe embodiment 2 of the present invention.

[0032] Fig.10 It is a schematic diagram of the FF cross-section of the structure of the probe embodiment 2 of the present invention.

[0033] The markings and corresponding parts and surface names in the attached drawings include: 1-outer sleeve; 2-inner sleeve; 3-temperature sensor; 4-insulating seal; 5-probe support rod; 6-exhaust hole; 7-outer sleeve straight groove; 8-inner sleeve straight groove; 9-temperature measuring hole. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0035] Embodiment 1:

[0036] The present invention can be applied to the measurement of the total temperature at the turbine outlet. The turbine outlet flow field is affected by the working conditions, resulting in a large change in the incoming flow direction and high temperature. The present invention can achieve accurate measurement of the total temperature in a high temperature environment and has a wide range of airflow insensitivity angles. In order to facilitate the installation of the probe at the turbine outlet, the support rod is selected to be "L" type. The selected probe structure scheme is as follows:

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this embodiment introduces a double-tube hemispherical head total temperature probe with a side groove, comprising an outer tube (1), an inner tube (2), a temperature sensor (3), a thermal insulation seal (4) and a probe support rod (5), wherein the inner tube (2) is located inside the outer tube (1) to form a double-tube structure, and the temperature sensor (3) is located inside the inner tube and fixed on the thermal insulation seal (4).

[0038] In this embodiment, the outer sleeve (1) and the inner sleeve (2) are both hollow cylindrical ends connected to a hemispherical head structure, and the side surfaces are respectively provided with straight grooves (7) and straight grooves (8), and the four straight grooves are mutually angled at 90°. The four straight grooves (7) of the outer sleeve (1) and the four straight grooves (8) of the inner sleeve (2) differ by 45°.

[0039] In this embodiment, the straight groove (7) of the outer sleeve (1) on the cylindrical side is 7.2 mm long and 1 mm wide, and the projected length of the straight groove (7) on the hemispherical head structure at the end of the outer sleeve (1) on the left side view is 1.6 mm; the straight groove (8) of the inner sleeve (2) on the cylindrical side is 5.4 mm long and 0.75 mm wide, and the projected length of the straight groove (8) on the hemispherical head structure at the end of the inner sleeve (1) on the left side view is 1.2 mm.

[0040] In this embodiment, the outer sleeve (1) and the inner sleeve (2) are both hollow cylinders with hemispherical head ends. The outer diameter of the hollow cylindrical portion of the inner sleeve (2) is 6 mm, and the outer diameter of the hollow cylindrical portion of the outer sleeve (1) is 8 mm. The wall thickness of the outer sleeve (1) and the inner sleeve (2) is 0.5 mm. The diameter of the probe support rod (5) is the same as the outer diameter of the outer sleeve, and the probe support rod (5) is "L" shaped.

[0041] In this embodiment, the length of the inner sleeve (2) is smaller than that of the outer sleeve (1), the length of the cylindrical part of the outer sleeve (1) is 35 mm, and the length of the cylindrical part of the inner sleeve (2) is 28 mm.

[0042] In this embodiment, a circular temperature measuring hole (9) is opened on the hemispherical head structure at the end of the outer sleeve (1), and the diameter of the temperature measuring hole (9) is 3 mm.

[0043] In this embodiment, three exhaust holes (6) are respectively opened in the same direction of two straight grooves (7) on the outer sleeve (1) that form an angle of 180° with each other. The diameter of the exhaust hole is 1 mm. The angle between the exhaust hole (6) and the axial direction of the outer sleeve (1) is 45°. The three exhaust holes (6) are located at the same circumferential position and are evenly distributed along the axial direction. The distance between two adjacent holes is 4 mm. Among them, the axial distance between the third exhaust hole and the glue sealing position between the two sleeves is 1.5 mm.

[0044] In this embodiment, the exhaust holes (6) on the inner sleeve (2) have the same diameter and spacing as the exhaust holes (6) on the outer sleeve, and can be oriented in the same direction or at an angle of 90° to the exhaust holes (6) on the outer sleeve (1). The exhaust holes (6) on the inner sleeve (2) are overall closer to the temperature measuring holes (9) than the exhaust holes (6) on the outer sleeve (1) by one time the spacing of the exhaust holes (6).

[0045] The temperature sensor (3) is a thermal resistor.

[0046] Embodiment 2:

[0047] The present invention can be applied to the measurement of the total temperature of the combustion chamber. The incoming flow of the engine combustion chamber is complex and the temperature is extremely high. The present invention can realize the accurate measurement of the total temperature in a high temperature environment and has an airflow insensitive angle range of -180° to 180° for deflection angle and -90° to 90° for pitch angle. The double-tube structure can well prevent the radiation effect of the airflow on the temperature sensor. When the present invention is applied to the measurement of the total temperature of the combustion chamber, the support rod structure can be selected as "I" type or "L" type. In this embodiment, the "I" type is selected. The selected probe structure scheme is as follows:

[0048] like Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, this embodiment introduces a double-tube hemispherical head total temperature probe with a side groove, comprising an outer tube (1), an inner tube (2), a temperature sensor (3), a thermal insulation seal (4) and a probe support rod (5), wherein the inner tube (2) is located inside the outer tube (1) to form a double-tube structure, and the temperature sensor (3) is located inside the inner tube and fixed on the thermal insulation seal (4).

[0049] In this embodiment, the outer sleeve (1) and the inner sleeve (2) are both hollow cylindrical ends connected to a hemispherical head structure, and the side surfaces are respectively provided with straight grooves (7) and straight grooves (8), and the four straight grooves are mutually angled at 90°. The four straight grooves (7) of the outer sleeve (1) and the four straight grooves (8) of the inner sleeve (2) differ by 45°.

[0050] In this embodiment, the straight groove (7) of the outer sleeve (1) on the cylindrical side is 7.2 mm long and 1 mm wide, and the projected length of the straight groove (7) on the hemispherical head structure at the end of the outer sleeve (1) on the left side view is 1.6 mm; the straight groove (8) of the inner sleeve (2) on the cylindrical side is 5.4 mm long and 0.75 mm wide, and the projected length of the straight groove (8) on the hemispherical head structure at the end of the inner sleeve (1) on the left side view is 1.2 mm.

[0051] In this embodiment, the outer sleeve (1) and the inner sleeve (2) are both hollow cylinders with hemispherical head end structures. The outer diameter of the hollow cylindrical part of the inner sleeve (2) is 6 mm, and the outer diameter of the hollow cylindrical part of the outer sleeve (1) is 8 mm. The wall thickness of the outer sleeve (1) and the inner sleeve (2) is 0.5 mm. The diameter of the probe support rod (5) is the same as the outer diameter of the outer sleeve. The probe support rod (5) can be selected to be "I"-shaped or "L"-shaped.

[0052] In this embodiment, the length of the inner sleeve (2) is smaller than that of the outer sleeve (1), the length of the cylindrical part of the outer sleeve (1) is 35 mm, and the length of the cylindrical part of the inner sleeve (2) is 28 mm.

[0053] In this embodiment, a circular temperature measuring hole (9) is opened on the hemispherical head structure at the end of the outer sleeve (1), and the diameter of the temperature measuring hole (9) is 3 mm.

[0054] In this embodiment, three exhaust holes (6) are respectively opened in the same direction of two straight grooves (7) on the outer sleeve (1) that form an angle of 180° with each other. The diameter of the exhaust hole is 1 mm. The angle between the exhaust hole (6) and the axial direction of the outer sleeve (1) is 45°. The three exhaust holes (6) are located at the same circumferential position and are evenly distributed along the axial direction. The distance between two adjacent holes is 4 mm. Among them, the axial distance between the third exhaust hole and the glue sealing position between the two sleeves is 1.5 mm.

[0055] In this embodiment, the exhaust holes (6) on the inner sleeve (2) have the same diameter and spacing as the exhaust holes (6) on the outer sleeve (1), and their directions form an angle of 90° with the exhaust holes (6) on the outer sleeve (1). The exhaust holes (6) on the inner sleeve (2) are overall closer to the temperature measuring holes than the exhaust holes (6) on the outer sleeve (1) by 1 times the spacing of the exhaust holes (6).

[0056] The temperature sensor (3) is a thermal resistor.

[0057] Although the preferred embodiment has been described, various modifications or substitutions may be made to the embodiment without departing from the spirit and scope of the invention. Therefore, it should be understood that the present invention has been described in an illustrative manner rather than a restrictive manner.

Claims

1. A double-tube hemispherical head total temperature probe with side slots, characterized in that: It comprises an outer sleeve (1), an inner sleeve (2), a temperature sensor (3), a heat-insulating seal (4) and a probe support rod (5), wherein the inner sleeve (2) is located inside the outer sleeve (1) to form a double sleeve structure, and the temperature sensor (3) is located inside the inner sleeve and fixed on the heat-insulating seal (4); The outer sleeve (1) and the inner sleeve (2) are both hollow cylindrical ends connected with hemispherical head structures, and four opposite outer sleeve straight grooves (7) and inner sleeve straight grooves (8) are respectively opened on the side circumference, and the four straight grooves on each sleeve form an angle of 90° with each other, and the four outer sleeve straight grooves (7) of the outer sleeve (1) and the four inner sleeve straight grooves (8) of the inner sleeve differ by 45°; The outer sleeve (1) outer sleeve outer sleeve straight groove (7) on the cylindrical side has a length of 0.8 to 1.0 times the outer diameter of the outer sleeve (1), and a width of 1 / 8 of the outer diameter of the outer sleeve (1). The projection length of the outer sleeve straight groove (7) on the hemispherical head structure at the end of the outer sleeve (1) in the left view is 1 / 6 to 1 / 4 times the outer diameter of the hemispherical head structure; the inner sleeve straight groove (8) on the cylindrical side of the inner sleeve (2) has a length of 0.8 to 1.0 times the outer diameter of the inner sleeve (2), and a width of 1 / 8 of the outer diameter of the inner sleeve (2). The projection length of the inner sleeve straight groove (8) on the hemispherical head structure at the end of the inner sleeve (1) in the left view is 1 / 6 to 1 / 4 times the outer diameter of the hemispherical head structure; The outer sleeve (1) and the inner sleeve (2) are both hollow cylinders with hemispherical head ends. The outer diameter of the hollow cylindrical portion of the inner sleeve (2) is 2 to 8 mm. The outer diameter of the hollow cylindrical portion of the outer sleeve (1) is 1.1 to 1.2 times the diameter of the inner sleeve (2). The wall thickness of the outer sleeve (1) and the inner sleeve (2) is 0.1 to 1 mm. The diameter of the probe support rod (5) is the same as the outer diameter of the outer sleeve (1). The probe support rod (5) can be in the shape of a straight line or an L-shape. The length of the inner sleeve (2) is smaller than that of the outer sleeve (1), and the distance between the inner sleeve (2) and the end of the outer sleeve (1) is 0.1 to 0.2 times the length of the outer sleeve (1); The hemispherical head structure at the end of the outer sleeve (1) is provided with a circular temperature measuring hole (9) whose center line is colinear with the axis of the sleeve, and the diameter of the temperature measuring hole (9) is 1 / 3 to 1 / 2 times the outer diameter of the hollow cylindrical part of the outer sleeve (1); On the outer sleeve (1), three exhaust holes (6) are respectively opened in the same direction of two outer sleeve straight grooves (7) which are at an angle of 180° to each other, the exhaust hole diameter is 0.5-2 mm, the exhaust hole (6) and the axial angle of the outer sleeve (1) are 45°, the three exhaust holes (6) are located at the same circumferential position and are evenly distributed along the axial direction, and the distance between two adjacent holes is 4-5 times the hole diameter, wherein the axial distance between the third exhaust hole and the glue sealing position between the two sleeves does not exceed 2 mm; The exhaust holes (6) on the inner sleeve (2) have the same diameter and spacing as the exhaust holes (6) on the outer sleeve, and can be oriented in the same direction or at a 90° angle to the exhaust holes (6) on the outer sleeve (1). The exhaust holes (6) on the inner sleeve (2) are overall closer to the temperature measuring holes than the exhaust holes (6) on the outer sleeve (1) by 0.5 to 1 times the spacing between the exhaust holes (6); The temperature sensor (3) may be a thermocouple, a thermal resistor or an optical fiber temperature sensor; The double-sleeve structure can reduce the damage to the temperature sensor caused by thermal radiation and direct impact of airflow. It can be used in high-temperature environments and extend the service life of the temperature sensor. The double-layer shielding and stagnation improve the measurement accuracy of the total temperature probe. The holes can adaptively realize intake and exhaust without the need for a complex exhaust system. The hemispherical head structure and slots increase the airflow insensitivity angle of the total temperature probe measurement.

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