S-bend nozzle wall temperature measuring device and application

Abstract

This invention discloses an S-curve nozzle wall temperature measurement device and its application, belonging to the field of aero-engines. It includes an embedded groove formed on the outer wall of the nozzle, an embedded structure detachably encapsulated within the groove opening, and a thermocouple mounting hole formed on the embedded structure. The inner surface of the embedded groove and the bottom surface of the embedded structure combine to form a positioning and receiving cavity for the thermocouple probe, enabling the thermocouple probe to be completely fitted into the temperature measurement area of ​​the nozzle wall. The thermocouple mounting hole is used to position the rod-shaped portion of the thermocouple. This invention solves the problems of existing testing methods, which cannot minimize the damage to the nozzle wall, cannot achieve multiple variable position measurements, and cannot measure the temperature distribution of the nozzle wall according to different needs.

Description

Technical Field

[0001] This invention belongs to the field of aero-engines, specifically relating to an S-curve nozzle wall temperature measuring device and its application. Background Technology

[0002] The S-bend nozzle is a crucial component for reducing the infrared radiation intensity of the exhaust system and enhancing aircraft stealth capabilities. Wall radiation is one of the main sources of infrared radiation from the S-bend nozzle, and the intensity of this infrared radiation is closely related to temperature. Temperature changes can drastically affect the nozzle's infrared radiation intensity. Therefore, measuring the nozzle wall temperature is a key step in investigating infrared radiation intensity during testing. Contact measurement using thermocouples is the most accurate technique, but thermocouples cannot be welded to the wall, and localized drilling can severely compromise strength due to excessive depth. Therefore, arranging thermocouples without compromising wall strength is the most critical aspect of temperature measurement.

[0003] In the existing technology for rapid measurement of infrared radiation characteristics of S-bend nozzles, the nozzle wall temperature is not measured, thus the nozzle wall temperature distribution cannot be obtained. As a result, the relationship between the wall temperature distribution and the infrared radiation intensity cannot be confirmed, and the accuracy of the measurement data cannot be verified. Summary of the Invention

[0004] The technical problem to be solved:

[0005] To overcome the shortcomings of existing technologies, this invention provides an S-bend nozzle wall temperature measurement device and its application. This device is coupled to the outer wall of the nozzle body through an embedded method, and the embedded structure is designed according to the outer shape of the thermocouple probe. While improving measurement accuracy, the embedded structure can be replaced according to different measurement positions. This invention solves the problems in existing test schemes that cannot minimize the damage to the nozzle wall, cannot achieve multiple variable position measurements, and cannot measure the temperature distribution of the nozzle wall according to different needs.

[0006] The technical solution of the present invention is: an S-bend nozzle wall temperature measuring device, comprising an embedded groove formed on the outer wall of the nozzle, an embedded structure detachably encapsulated in the groove opening, and a thermocouple mounting hole formed on the embedded structure; the inner surface of the embedded groove and the bottom surface of the embedded structure together form a positioning and receiving cavity for the thermocouple probe, which can completely fit the thermocouple probe into the temperature measuring area of ​​the nozzle wall; the thermocouple mounting hole is used to position the rod-shaped part of the thermocouple.

[0007] A further technical solution of the present invention is that the inner surface of the embedded groove is an arc surface that fits against the bottom of the thermocouple probe.

[0008] A further technical solution of the present invention is: the embedded structure is a thermocouple mounting rail; the overall profile of the thermocouple mounting rail is consistent with the profile of the outer wall of the nozzle at the matching embedded groove, and a guide rail groove is opened on its bottom surface along the length direction, the guide rail groove being an arc surface that fits against the upper part of the thermocouple probe.

[0009] A further technical solution of the present invention is: the radius of the arc surface of the embedded slide groove and the guide rail slide groove are both equal to the radius of the thermocouple probe. After the two are combined, they form a circular channel with a radius equal to the radius of the thermocouple probe, which serves as a positioning and receiving cavity for multiple thermocouple probes.

[0010] A further technical solution of the present invention is: the thermocouple mounting guide rail has multiple thermocouple mounting holes along its length, which are used to install thermocouples for testing the temperature at different nozzle wall positions.

[0011] A further technical solution of the present invention is: it also includes a wall slide rail, which includes two parallel flat plates, which are respectively vertically arranged at the two sides of the embedded slide groove, serving as an upward extension structure of the embedded slide groove, and can limit the displacement of the thermocouple mounting rail.

[0012] A further technical solution of the present invention is: multiple coaxial through holes are opened on the two plates of the wall slide rail along the length direction, and a through hole coaxial with the wall slide rail is opened at the relative position of the thermocouple mounting guide rail. The through holes at the same position of the wall slide rail and the thermocouple mounting guide rail form a guide rail fixing groove, and the thermocouple mounting guide rail is fixed between the two plates of the wall slide rail by fasteners.

[0013] A further technical solution of the present invention is that: both the starting end and the ending end of the wall slide rail are provided with a limiting structure for the initial positioning of the thermocouple mounting rail installed inside the wall slide rail.

[0014] A further technical solution of the present invention is: the two flat plates of the wall slide rail and the limiting structures at the starting end and the ending end form an annular cavity, and the annular cross section of the annular cavity is consistent with the transverse cross section of the thermocouple mounting rail.

[0015] An application of an S-bend nozzle wall temperature measuring device in an S-bend nozzle, wherein the centerline of the S-bend nozzle is S-shaped, its inlet is a circular cross-section, and its outlet is a rectangular cross-section; the S-bend nozzle wall temperature measuring device is respectively installed on the upper and lower walls of the S-bend nozzle.

[0016] The centerlines of the embedded grooves and embedded structures located on the upper and lower walls are both located on the symmetry plane of the S-bend nozzle. The profile of the embedded grooves and embedded structures on the upper wall is consistent with the upper wall, and the profile of the embedded grooves and embedded structures on the lower wall is consistent with the lower wall. Both the upper and lower embedded structures have multiple thermocouple mounting holes perpendicular to the nozzle wall along their length, which vertically fix multiple thermocouples to the temperature measurement area of ​​the nozzle wall for real-time temperature measurement.

[0017] Beneficial effects

[0018] The beneficial effects of the present invention are as follows: The nozzle outer wall surface embedded groove of the present invention matches the shape of the thermocouple, and the nozzle surface is grooved to an appropriate depth (preferably half the wall thickness depth), and is used in conjunction with the thermocouple mounting guide rail with the guide rail mounting groove as the embedded structure, so that the thermocouple can be partially embedded in the outer wall surface embedded groove and partially embedded in the thermocouple mounting guide rail.

[0019] Preferably, two rails of a certain thickness extend from the outer wall of the nozzle as outer wall sliding tracks, which cooperate with the thermocouple mounting rails to completely embed the thermocouples into the nozzle surface, thereby achieving more accurate temperature measurement. Simultaneously, the thermocouple mounting rails are replaceable; the rails can be changed according to the needs of different temperature measurement positions, and multiple positions can be reused for measurement by drilling holes at different locations. This invention minimizes damage to the nozzle wall, improves measurement accuracy, and enables multiple variable position measurements, thus allowing for the measurement of the nozzle wall temperature distribution according to different needs.

[0020] Reference Figure 5 As shown in the diagram, the nozzle deformation contours with and without a guide rail are as follows: (a) shows that without the guide rail, a red area appears above the nozzle exit, indicating a region of significant deformation; (b) shows that with the guide rail, the red area above the nozzle exit turns green, and the deformation at the nozzle exit is suppressed. Therefore, when a guide rail is added, the nozzle deformation is not only unaffected but is also suppressed, thus protecting the nozzle. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an optional S-bend nozzle wall temperature measuring device according to an embodiment of the present invention; (a) a simplified diagram of the nozzle, (b) a three-dimensional isometric view;

[0022] Figure 2 This is a schematic diagram of the thermocouple mounting rail on the nozzle; (a) sectional view of the upper thermocouple mounting rail, (b) three-dimensional isometric view of the upper thermocouple mounting rail;

[0023] Figure 3 This is a schematic diagram of the lower thermocouple mounting guide rail; (a) sectional view of the lower thermocouple mounting guide rail, (b) three-dimensional isometric view of the lower thermocouple mounting guide rail;

[0024] Figure 4 This is an exploded view of the installation of thermocouples, nozzle mounting rails, and nozzle outer wall sliding rails.

[0025] Figure 5 These are cloud diagrams showing the influence of the slide rail on nozzle deformation; (a) Deformation cloud diagram without slide rail; (b) Deformation cloud diagram with slide rail.

[0026] Explanation of reference numerals in the attached drawings: 1. Inset groove on the outer wall of the nozzle; 2. Upper outer wall slide rail; 3. Lower outer wall slide rail; 4. Guide rail fixing groove; 5. Nozzle body; 6. Guide rail thermocouple mounting hole; 7. Guide rail slide groove; 8. Upper thermocouple mounting guide rail; 9. Lower thermocouple mounting guide rail; 10. Thermocouple. Detailed Implementation

[0027] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] The existing technology makes it impossible to obtain the nozzle wall temperature distribution, which makes it impossible to confirm the relationship between the wall temperature distribution and the infrared radiation intensity, thus making it impossible to verify the accuracy of the measurement data. The present invention provides an S-curve nozzle wall temperature measuring device. The device is coupled to the outer wall of the nozzle body by embedding, and the embedding structure is designed according to the outer shape of the thermocouple probe. While improving the measurement accuracy, the embedding structure can be changed according to different measurement positions. At the same time, based on solving the problems of the existing technology, it can suppress the deformation of the nozzle outlet.

[0030] Reference Figure 1As shown in the figure, this embodiment of an S-curve nozzle wall temperature measuring device includes: an inner groove 1 on the outer wall of the nozzle, an upper outer wall slide rail 2, a lower outer wall slide rail 3, a guide rail fixing groove 4, a nozzle body 5, a guide rail thermocouple mounting hole 6, a guide rail groove 7, an upper thermocouple mounting guide rail 8, a lower thermocouple mounting guide rail 9, and a thermocouple 10. The inner groove 1 on the outer wall of the nozzle is achieved by matching the shape of the thermocouple probe, creating a groove in the nozzle wall with a depth equal to the radius of the spherical thermocouple probe. The outer wall slide rail consists of two vertically extending flat plate structures of a certain thickness on the outer wall of the nozzle, which cooperate with the thermocouple mounting guide rail to completely embed the thermocouple into the nozzle surface, thereby measuring the nozzle wall temperature.

[0031] Specifically, one half of the thermocouple probe is installed in the recessed groove 1 on the nozzle wall, and the other half is installed in the guide groove 7 of the thermocouple mounting rail. The thermocouple is surrounded and fixed by the recessed groove 1 on the nozzle outer wall, the thermocouple mounting rail, and the outer wall rail, ensuring complete contact between the thermocouple's spherical head and the wall surface for accurate temperature measurement. The thermocouple mounting rail has guide rail thermocouple mounting holes 6, which fix the axial position of the thermocouple. When the axial position of the thermocouple needs to be changed, only the position of the thermocouple mounting holes on the guide rail needs to be modified, allowing for nozzle wall temperature detection at the new detection position.

[0032] Specifically, such as Figure 1 As shown, the groove 1 embedded in the outer wall of the nozzle is a semi-circular groove with a shape consistent with the spherical shape of the thermocouple head. Its depth is determined by the radius R of the thermocouple spherical probe. After the nozzle is shaped, the outer wall of the nozzle is grooved, allowing the thermocouple spherical probe to make full contact with the groove wall, thus making the temperature measurement more accurate. The upper outer wall slide rail 2 and the lower outer wall slide rail 3 are each composed of two plate-like structures. Their purpose is to allow the nozzle wall surface at the edge of the embedded groove 1 to extend upwards rather than downwards. This reduces the depth of the groove, preventing severe damage to the stress strength structure of the nozzle, and supports the upper thermocouple mounting rail 8 and the lower thermocouple mounting rail 9, allowing the other half of the thermocouple to contact the wall surface and simultaneously fixing the thermocouple's axial position.

[0033] Specifically, the starting and ending ends of the wall slide rail are provided with limiting structures for the initial positioning of the thermocouple mounting rail installed inside the wall slide rail; the two flat plates of the wall slide rail and the limiting structures at the starting and ending ends form an annular cavity, and the annular cross-section of the annular cavity is consistent with the transverse cross-section of the thermocouple mounting rail.

[0034] Reference Figure 2 and Figure 3 As shown, Figure 2 To install guide rail 8 on the upper thermocouple, Figure 3 The thermocouple mounting rail 9 is used as an embedded structure. Its overall profile is consistent with the profile of the outer wall of the nozzle at the matching inner groove 1. The bottom surface has a guide rail groove 7 along the length direction. The guide rail groove 7 is an arc surface that fits with the upper part of the thermocouple probe.

[0035] Specifically, in this embodiment, the wall-mounted slide rail is composed of two homogeneous plates with a thickness between 3 and 5 mm. The outer wall-mounted slide rail is distributed on both sides of the embedded groove on the outer wall surface. It serves two purposes: firstly, it fixes the thermocouple ball head; secondly, it clamps the thermocouple mounting guide rail, allowing the thermocouple mounting guide rail to be placed more stably into the groove of the outer wall-mounted slide rail. This fixes the thermocouple ball probe in place, enabling measurement at the desired location. The outer wall-mounted slide rail has a section perpendicular to the direction of movement, ensuring lateral fixation between the outer wall-mounted slide rail and the thermocouple mounting guide rail, preventing movement of the mounting guide rail during measurement.

[0036] Specifically, multiple coaxial through holes are formed along the length of the two plates of the wall slide rail. A through hole coaxial with the wall slide rail is formed at the corresponding position of the thermocouple mounting rail. The through holes at the same positions of the wall slide rail and the thermocouple mounting rail form a rail fixing groove 4. Fasteners are used to fix the thermocouple mounting rail between the two plates of the wall slide rail. In this embodiment, each of the two thermocouple mounting rails has four lateral rail fixing grooves 4, thereby allowing the thermocouple mounting rail to be laterally fixed to the wall slide rail.

[0037] Specifically, the thermocouple mounting rail is made of a thin plate with a partially curved structure. It has a guide rail groove with a radius equal to that of the thermocouple ball head, which facilitates the fixing of the thermocouple ball head to the groove embedded in the outer wall surface. The thermocouple mounting rail has a transverse hole for fixing to the outer wall surface rail, and a longitudinal hole for fixing the rear wire of the thermocouple ball head.

[0038] In this embodiment, both mounting rails 8 and 9 have guide rail grooves 7, and the cross-section of the guide rail grooves 7 is semi-circular, so that the thermocouples 10 mounted on the upper and lower walls can fully contact the mounting rails 8 and 9. Both mounting rails 8 and 9 have guide rail thermocouple mounting holes 6. The mounting holes 6 are used to install thermocouples at the required axial position. The position of the mounting holes in the figure is only for illustration. By changing the axial position of the mounting holes 6, the wall temperature at different positions can be measured.

[0039] Reference Figure 4As shown, the S-bend nozzle wall temperature measuring device includes an upper thermocouple mounting rail 8, a lower thermocouple mounting rail 9, and a thermocouple 10. In this embodiment, the thermocouple is a K-type thermocouple with a spherical temperature measuring point. The technical solution of this invention remains applicable even if the thermocouple shape is changed. Thermocouple 10, by evenly arranging four thermocouples on the upper and lower rails and placing them vertically, can achieve accurate temperature measurement of the nozzle wall. The number and position of the thermocouples in this invention are for illustrative purposes only. In practice, the number and position of the thermocouples can be set as needed. When resetting, only the upper thermocouple mounting rail 8 and the lower thermocouple mounting rail 9 need to be changed; the embedded groove on the outer wall of the nozzle does not need to be modified, thereby reducing the workload of repeated measurements.

[0040] This embodiment describes the application of an S-bend nozzle wall temperature measuring device in an S-bend nozzle. The centerline of the main body of the S-bend nozzle is S-shaped, and it is a converging nozzle. Its inlet has a circular cross-section, and its outlet has a rectangular cross-section. The width-to-height ratio of the outlet rectangle is between 3 and 6, and the wall thickness is between 4 and 6 mm.

[0041] Temperature measuring devices for the S-bend nozzle wall are respectively installed on the upper and lower walls of the nozzle. The center lines of the embedded grooves and embedded structures on the upper and lower walls are located on the symmetry plane of the S-bend nozzle. The profile of the embedded grooves and embedded structures on the upper wall is consistent with the upper wall, and the profile of the embedded grooves and embedded structures on the lower wall is consistent with the lower wall. Multiple thermocouple mounting holes perpendicular to the nozzle wall are opened along the length of the upper and lower embedded structures, and multiple thermocouples are vertically fixed to the temperature measuring area of ​​the nozzle wall for real-time temperature measurement.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A device for measuring the wall temperature of an S-bend nozzle, characterized in that: The device includes an embedded groove on the outer wall of the nozzle, an embedded structure detachably encapsulated in the groove opening, a thermocouple mounting hole on the embedded structure, and a wall-mounted slide rail. The inner surface of the embedded groove and the bottom surface of the embedded structure combine to form a positioning and receiving cavity for the thermocouple probe, which can completely fit the thermocouple probe into the temperature measurement area of ​​the nozzle wall. The thermocouple mounting hole is used to position the rod-shaped part of the thermocouple. The inner surface of the embedded groove is an arc surface that fits against the bottom of the thermocouple probe; The embedded structure is a thermocouple mounting rail; the overall profile of the thermocouple mounting rail is consistent with the profile of the outer wall of the nozzle at the matching inner groove, and the bottom surface of the thermocouple mounting rail has a guide rail groove along the length direction, and the guide rail groove is an arc surface that fits with the upper part of the thermocouple probe. The wall slide rail includes two parallel flat plates, which are vertically arranged at the two sides of the embedded slide groove, serving as an upward extension structure of the embedded slide groove and limiting the displacement of the thermocouple mounting rail.

2. The S-bend nozzle wall temperature measuring device according to claim 1, characterized in that: The radius of the arc surface of the embedded slide groove and the guide rail slide groove are both equal to the radius of the thermocouple probe. When the two are combined, they form a circular channel with a radius equal to the radius of the thermocouple probe, which serves as a positioning and receiving cavity for multiple thermocouple probes.

3. The S-bend nozzle wall temperature measuring device according to claim 2, characterized in that: The thermocouple mounting rail has multiple thermocouple mounting holes along its length, which are used to install thermocouples for testing the temperature at different nozzle wall positions.

4. The S-bend nozzle wall temperature measuring device according to claim 3, characterized in that: Multiple coaxial through holes are opened along the length direction on the two plates of the wall slide rail. A through hole coaxial with the wall slide rail is opened at the relative position of the thermocouple mounting guide rail. The through holes at the same position of the wall slide rail and the thermocouple mounting guide rail form a guide rail fixing groove. The thermocouple mounting guide rail is fixed between the two plates of the wall slide rail by fasteners.

5. The S-bend nozzle wall temperature measuring device according to claim 4, characterized in that: The wall slide rail is equipped with a limit structure at both the starting and ending ends for initial positioning of the thermocouple mounting rail installed inside the wall slide rail.

6. The S-bend nozzle wall temperature measuring device according to claim 5, characterized in that: The two flat plates of the wall slide rail and the limiting structures at the starting and ending ends form an annular cavity.

7. The application of the S-bend nozzle wall temperature measuring device according to any one of claims 1-6 in an S-bend nozzle, characterized in that: The centerline of the S-bend nozzle is S-shaped, with a circular inlet and a rectangular outlet. Temperature measuring devices for the S-bend nozzle wall are respectively installed on the upper and lower walls of the nozzle. The centerlines of the embedded grooves and embedded structures located on the upper and lower walls are both located on the symmetry plane of the S-bend nozzle. The profile of the embedded grooves and embedded structures on the upper wall is consistent with the upper wall, and the profile of the embedded grooves and embedded structures on the lower wall is consistent with the lower wall. Both the upper and lower embedded structures have multiple thermocouple mounting holes perpendicular to the nozzle wall along their length, which vertically fix multiple thermocouples to the temperature measurement area of ​​the nozzle wall for real-time temperature measurement.

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