Boundary layer flow field measurement method and device for high-speed wind tunnel model

Abstract

The invention discloses a boundary layer flow field measuring method and device for a high-speed wind tunnel model. The boundary layer flow field measuring device comprises a vertical moving mechanism, a transverse moving mechanism and an axial moving mechanism. The vertical moving mechanism is connected to a supporting arm in the wind tunnel; the transverse moving mechanism is supported on the vertical moving mechanism and can transversely move on the vertical moving mechanism; the axial moving mechanism is supported on the transverse moving mechanism and can telescopically move on the transverse moving mechanism in the length direction of the transverse moving mechanism; the axial moving mechanism is provided with a measuring shaft which can stretch out and draw back in the length direction of the axial moving mechanism. The tail end of the measuring shaft is provided with a probe used for measuring boundary layer parameters and a height detector. According to the invention, the static contour measured by the height detector is used as a reference, a safe height is added to the probe on the basis of the static contour, and after the wind tunnel operates, the accurate movement of the probe can be controlled through the contour detected by the height detector in real time and the position of the measuring device, and meanwhile, the probe is prevented from colliding with the model.

Description

Technical Field

[0001] The present invention relates to the field of aviation technology, in particular to wind tunnel technology in the aviation field, and more particularly to a boundary layer flow field measurement method and device for a high-speed wind tunnel model. Background Art

[0002] In high-speed flight, the boundary layer has an important influence on aerodynamic characteristics. The thickness and state of the boundary layer (laminar or turbulent) will affect the friction resistance, pressure distribution and lift of the surface. Understanding the boundary layer phenomenon is crucial to optimizing aircraft design, improving aerodynamic efficiency and reducing drag. For example, under supersonic and hypersonic conditions, the air flow in the boundary layer generates high heat, which may damage the surface materials of the aircraft. Studying the thermal effects of the boundary layer can help design effective cooling systems and select heat-resistant materials. In addition, the state of the boundary layer determines whether the flow will separate. Flow separation often leads to problems such as stall and decreased aircraft stability. By studying the boundary layer, effective flow control methods can be found to prevent separation or reduce the negative impact of separation. The turbulent characteristics of the boundary layer will also affect the vibration and noise of the aircraft, especially for high-speed aircraft, which is particularly important. Studying the boundary layer helps reduce the noise generated by the aircraft during flight, improve comfort and reduce environmental impact.

[0003] The study of boundary layer flow field usually relies on high-speed wind tunnels. Usually, an aircraft model or its parts, such as the fuselage and wings, are fixed in a high-speed wind tunnel. By applying artificial airflow through the aircraft model or its parts, various complex flight states in the air are simulated to obtain experimental data of the boundary layer. Since the formation and development of the boundary layer is a complex nonlinear problem, especially under high-speed conditions, it involves multiple factors such as turbulence, pressure gradient, thermal effect, etc., which is difficult to accurately describe with a simple model. Therefore, in high-speed wind tunnel experiments, in addition to requiring the wind tunnel to accurately simulate the actual boundary conditions such as temperature, pressure, and velocity, accurate measurement methods are also required to accurately measure the thickness, velocity field, and temperature field of the boundary layer. In the prior art, laser velocimeters (PIV) and infrared imaging technologies are often used to measure the overall flow field in the wind tunnel, but there are problems of high cost and difficulty in operation. At the same time, since the thickness of the boundary layer is very small and its proportion in the overall flow field is also very small, the accuracy of the boundary layer parameters measured by PIV or infrared imaging technology is not enough.

[0004] In the previous study, the applicant proposed a three-coordinate mobile test device for a wind tunnel, and its application publication number is CN 102607795 A. In this study, the scheme proposed by the applicant includes an X-axis mobile mechanism, a Y-axis mobile mechanism and a Z-axis mobile mechanism. The three-axis mobile mechanisms can move perpendicularly to each other, and the probe for measuring flow field parameters is installed on the X-axis mobile mechanism. The front windward structure of the measuring device spans the entire wind tunnel, which has a large degree of obstruction to the wind tunnel. Both the Y-axis and the Z-axis require two sets of mechanisms for end support, which makes it difficult to accurately move synchronously. The operating parts of the three-axis mobile mechanism are all exposed in the wind tunnel flow field, which seriously affects the accuracy of the wind tunnel simulation of the actual temperature, pressure, speed and other boundary conditions. In addition, the three-axis mobile mechanism of the measuring device lacks a mobile constraint mechanism, especially it is difficult to generate a dynamic response to the changes in the outer surface of the model, and the measuring probe cannot move accurately within the thickness range of the boundary layer, so it is difficult to perform dynamic and accurate measurement of the boundary layer flow field. The measuring device also does not have a measurement method for the boundary layer on the surface of the model with complex shapes, and cannot achieve accurate measurement of the boundary layer flow field under high-speed conditions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and device for measuring the boundary layer flow field of a high-speed wind tunnel model, so as to reduce or avoid the above-mentioned problems.

[0006] In order to solve the above technical problems, the present invention proposes a method for measuring the boundary layer flow field of a high-speed wind tunnel model, wherein the method comprises the following steps: setting a boundary layer flow field measuring device in a high-speed wind tunnel; the measuring device comprises a vertical moving mechanism, a lateral moving mechanism and an axial moving mechanism; the axial moving mechanism has a measuring shaft that can be extended and retracted along its length direction, and a probe and a height detector are arranged at the end of the measuring shaft for measuring boundary layer parameters; inputting the theoretical profile height L of the model to be measured into the measuring device; operating the measuring device to make the probe move once along the theoretical profile height L plus a safety height of height h, and at the same time using the height detector to detect the actual height H of the probe from the model, and L+hH is stored in the measuring device as the actual profile height P of the model; starting the high-speed wind tunnel, making the probe move to the position of the actual profile height P of the model plus the boundary layer height value t to be detected to measure the boundary layer parameters, and at the same time using the height detector to detect the dynamic height of the probe in real time and feed it back to the measuring device, and the measuring device corrects the height of the probe according to the dynamic height obtained by the measurement.

[0007] Preferably, the measuring method further comprises the following steps: moving the probe along the safety height to above the position to be measured, then using a height detector to detect the height of the probe from the model, operating the measuring device to lower the probe to a position at a height t from the model; after the measurement is completed, raising the probe to the safety height and moving it above the next position to be measured, and repeating the above steps to perform measurement.

[0008] The present invention also proposes a boundary layer flow field measuring device for the above-mentioned measurement method, comprising a vertical moving mechanism, a lateral moving mechanism and an axial moving mechanism; the vertical moving mechanism is connected to a support arm in the wind tunnel; the lateral moving mechanism is supported on the vertical moving mechanism and can move laterally on the vertical moving mechanism; the axial moving mechanism is supported on the lateral moving mechanism and can move telescopically along its length direction on the lateral moving mechanism; wherein the axial moving mechanism has a measuring axis that can be telescopic along its length direction, and a probe for measuring boundary layer parameters and a height detector are provided at the end of the measuring axis.

[0009] Preferably, the vertical moving mechanism includes a vertical rolling screw driven by a motor and two vertical guide rails arranged at right angles; the lateral moving mechanism is fixedly connected to a vertical screw nut that cooperates with the vertical rolling screw, and the vertical screw nut can move up and down along the vertical rolling screw as the vertical rolling screw rotates; the lateral moving mechanism is fixedly connected to two groups of vertical guide rail sliders that cooperate with the vertical guide rails.

[0010] Preferably, a vertical magnetic strip is fixedly provided on the vertical moving mechanism, and a vertical magnetic scale reading head for detecting the vertical magnetic strip is fixedly provided on the lateral moving mechanism.

[0011] Preferably, the transverse moving mechanism includes a transverse rolling screw driven by a motor and two horizontally arranged transverse guide rails; the axial moving mechanism is fixedly connected to a transverse screw nut that cooperates with the transverse rolling screw, and the transverse screw nut can move left and right along the transverse rolling screw as the transverse rolling screw rotates; the axial moving mechanism is fixedly connected to two transverse guide rail sliders that cooperate with the transverse guide rails.

[0012] Preferably, a transverse magnetic strip is fixedly provided on the transverse moving mechanism, and a transverse magnetic scale reading head for detecting the transverse magnetic strip is fixedly provided on the axial moving mechanism.

[0013] Preferably, the axial movement mechanism includes an axial rolling screw driven by a motor, on which is provided an axial screw nut which can move forward and backward along the axial rolling screw as the axial rolling screw rotates; a plurality of guide rods are arranged around the axial rolling screw, and the guide rods are inserted into guide holes of a guide plate fixedly connected to the axial screw nut; and the measuring shaft is fixedly connected to the guide plate.

[0014] Preferably, a rectifying guide cylinder is arranged on the outer side of the guide rod, a plurality of guide grooves are arranged on the inner side wall of the rectifying guide cylinder, and the guide plate has a protrusion matched with the guide groove.

[0015] Preferably, an axial magnetic strip is fixedly provided on the inner side wall of the rectifying guide cylinder of the axial moving mechanism, and an axial magnetic scale reading head for detecting the axial magnetic strip is fixedly provided on the guide plate.

[0016] The present invention uses the static profile measured by the height detector as a reference, adds a safety height to the probe on the basis of the static profile, and then after the wind tunnel is running, adjusts the position of the measuring device through the profile detected in real time by the height detector, thereby controlling the precise movement of the probe and avoiding collision between the probe and the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only intended to illustrate and explain the present application, and are not intended to limit the scope of the present invention.

[0018] Figure 1 Shown is a schematic diagram of the three-dimensional structure of a device for measuring the boundary layer flow field of a high-speed wind tunnel model according to a specific embodiment of the present invention.

[0019] Figure 2 Shown is a side schematic diagram of a device for measuring the boundary layer flow field of a high-speed wind tunnel model according to a specific embodiment of the present invention.

[0020] Figure 3 Shown is a schematic diagram of the principle of the boundary layer flow field measurement method for a high-speed wind tunnel model of the present invention.

[0021] Figure 4 Shown is an exploded schematic diagram of a device for measuring the boundary layer flow field of a high-speed wind tunnel model according to yet another specific embodiment of the present invention.

[0022] Figure 5 Shown is an exploded perspective view of a vertical moving mechanism of a measuring device according to a specific embodiment of the present invention.

[0023] Figure 6 Shown is a cross-sectional schematic diagram of a vertical moving mechanism according to another specific embodiment of the present invention.

[0024] Figure 7 Shown is a schematic cross-sectional view of a lateral movement mechanism according to a specific embodiment of the present invention.

[0025] Figure 8 Shown is an exploded perspective view of a lateral movement mechanism according to another embodiment of the present invention.

[0026] Fig. 9 Shown is an enlarged schematic diagram of the end portion of an axial movement mechanism of a specific embodiment of the present invention.

[0027] Fig.10 Shown is an exploded perspective view of an axial movement mechanism according to another specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention is now described with reference to the accompanying drawings, wherein the same components are marked with the same reference numerals.

[0029] like Figure 1-3 As shown, the present invention proposes a measurement device for the boundary layer flow field of a high-speed wind tunnel model and a method for measuring the boundary layer flow field using the measurement device. As shown in the figure, the measurement device of the present invention adopts a single-arm support structure arranged in the direction of the wind tunnel flow, which is particularly suitable for measuring the boundary layer parameters of the model surface in the high-speed wind tunnel.

[0030] Specifically, the measuring device of the present invention can be used to measure the boundary layer of the model 100 set in a high-speed wind tunnel, for example Figure 2 In the specific embodiment shown, the model 100 can be a wing, the leading edge of the wing is aligned with the incoming flow direction, the measuring device is arranged downstream of the wing, and a probe 1 for measuring boundary layer parameters is arranged at the front end of the measuring device. Through the combination of different probes 1, the temperature, pressure, speed and other parameters of the boundary layer can be measured. For example, when the temperature of the boundary layer needs to be measured, the probe 1 can be replaced with an infrared temperature sensor, when the pressure needs to be measured, the probe 1 can be replaced with a pressure sensor, when the speed needs to be measured, the probe 1 can be replaced with a pitot tube, or the above sensors can be combined and arranged in the probe 1 to synchronously measure various parameters of the boundary layer.

[0031] Furthermore, the measuring device of the single-arm support structure of the present invention is configured to have a structure capable of moving in three axes, such as Figure 1 As shown, the measuring device includes a vertical moving mechanism 10, a lateral moving mechanism 20 and an axial moving mechanism 30; the axial moving mechanism 30 has a measuring shaft 31 which can be extended and retracted along its length direction, and a probe 1 for measuring boundary layer parameters is arranged at the end of the measuring shaft 31.

[0032] Different from the prior art, the measuring device of the present invention is provided with a connection seat 11 at the rear side of the vertical moving mechanism 10, and the entire measuring device can be installed on a support arm (not shown in the figure) in the wind tunnel through the connection seat 11. The support arm can be a support system such as that disclosed in CN 103033336 B, or other support arm structures suitable for high-speed wind tunnels available in the art can be adopted. Furthermore, the outer sides of the vertical moving mechanism 10, the lateral moving mechanism 20 and the axial moving mechanism 30 of the present invention are all provided with fairings to reduce interference with the flow field.

[0033] In addition, the present invention also provides a height detector 2 at the end of the measuring axis 31 to constrain the movement of the measuring device, avoid collision between the probe 1 and the model 100 and cause damage, and dynamically correct the height deviation of the probe 1. The height detector 2 can be any existing laser detector suitable for height detection. Figure 1 and Figure 2 In the figure, the dotted line below the height detector 2 schematically represents the laser beam. The dotted line is not a real structure, but is only for the convenience of indicating that the height detector 2 can emit laser downward to detect its height from the model 100 to be measured. At the same time, according to the relative installation height between the height detector 2 and the probe 1, the height of the probe 1 from the model 100 can be calculated.

[0034] Specifically, generally speaking, the model 100 has a theoretical profile when it is designed, but deviations will occur after manufacturing and installation, and the actual profile does not match the theoretical profile, and the actual profile needs to be detected by the height detector 2. However, even so, after the high-speed wind tunnel is opened, under the influence of huge aerodynamic pressure, the profile of the model 100 will change dynamically. At this time, even if the height detector 2 detects in real time, the obtained profile parameters are of no use, because the measures taken by the present invention are to first measure the static profile when the wind tunnel is not opened, use the static profile as a reference, and add a safety height to the probe 1 based on the static profile. Then, after the wind tunnel is running, the profile is detected in real time by the height detector 2 to adjust the position of the measuring device to avoid collision between the probe 1 and the model.

[0035] Further, such as Figure 3As shown, the present invention proposes a method for measuring the boundary layer flow field of a high-speed wind tunnel model, comprising the following steps: first, setting the aforementioned boundary layer flow field measurement device in the high-speed wind tunnel; then, inputting the theoretical profile height L of the model 100 to be measured into the measurement device; then, operating the measurement device to make the probe 1 move along a trajectory of the theoretical profile height L plus the height h, and at the same time using the height detector 2 to detect the actual height H of the probe 1 from the model 100, and storing L+hH as the actual profile height P of the model 100 in the measurement device; starting the high-speed wind tunnel, moving the probe 1 to a position where the actual profile height P of the model 100 plus the boundary layer height value t to be detected measures the boundary layer parameters, and at the same time using the height detector 2 to detect the dynamic height of the probe 1 in real time and feed it back to the measurement device, and the measurement device corrects the height of the probe 1 according to the dynamic height obtained by the measurement.

[0036] Figure 3 In the example, it is assumed that any point on the model 100 has a theoretical profile height L relative to the mounting reference surface. Based on the theoretical profile height L, a safety height h is added to the probe 1, so that the probe 1 can be moved along a safe trajectory. At this time, the height of the probe 1 relative to the model 100 measured by the height detector 2 is H. If the theoretical profile of the model 100 ( Figure 3 The height and actual profile (shown by the solid line) Figure 3 If the heights of the two points (shown by the dashed line in the middle) are the same, then h=H, but obviously, the two cannot remain exactly the same, and L+hH is the actual profile height P of this point of the model 100. Afterwards, in order to measure the parameters of the boundary layer at a height t above the actual profile height P, the probe 1 is adjusted to move along the trajectory of the actual profile height P+t.

[0037] At this time, it is necessary to be careful that the probe 1 does not touch the model 100. Therefore, the specific method should be to first move the probe 1 along the safe height to the top of the position to be measured, then use the height detector 2 to detect the height of the probe 1 from the model 100, and operate the measuring device to lower the probe 1 to a position with a height t from the model 100. After the measurement is completed, the probe 1 is raised to the safe height and moved to the top of the next position to be measured, and the above steps are repeated for measurement.

[0038] Please refer to the attached Figure 4-10 The structure of the measuring device of the present invention will be described in further detail.

[0039] like Figure 4As shown, as mentioned above, the boundary layer flow field measurement device of the present invention includes a vertical moving mechanism 10, a lateral moving mechanism 20 and an axial moving mechanism 30; the vertical moving mechanism 10 is connected to the support arm in the wind tunnel through a connecting seat 11 installed at the rear side. Among them, the lateral moving mechanism 20 is supported on the vertical moving mechanism 10 and can move laterally on the vertical moving mechanism 10; the axial moving mechanism 30 is supported on the lateral moving mechanism 20 and can move telescopically along its length direction on the lateral moving mechanism 20; the axial moving mechanism 30 has a measuring shaft 31 that can be telescopic along its length direction, and the end of the measuring shaft 31 is provided with a probe 1 for measuring boundary layer parameters and a height detector 2.

[0040] Further, such as Figure 5-6 As shown, the vertical moving mechanism 10 includes a vertical rolling screw 13 driven by a motor 12 and two vertical guide rails 14 arranged at right angles. Of course, a reducer, bearings and other structures are also provided between the motor 12 and the vertical rolling screw 13. In order to reduce wind resistance, the vertical moving mechanism 10 is also provided with a fairing 19 and other structures that wrap the motor 12 and the reducer. The arrangement of the two vertical guide rails 14 at right angles can enhance the lateral stiffness of the entire measuring device, thereby reducing the number and volume of structures that need to be supported, thereby achieving single-arm support and reducing blockage of the wind tunnel.

[0041] Corresponding to the structure on the vertical moving mechanism 10, such as Figure 7-8 As shown, a vertical screw nut 15 cooperating with the vertical rolling screw 13 is fixedly connected to the transverse moving mechanism 20, and the vertical screw nut 15 can move up and down along the vertical rolling screw 13 as the vertical rolling screw 13 rotates; two groups of vertical guide rail sliders 16 cooperating with the vertical guide rail 14 are fixedly connected to the transverse moving mechanism 20.

[0042] In addition, in order to accurately control and constrain the vertical movement mechanism 10 to manipulate the up and down movement of the lateral movement mechanism 20, a vertical magnetic stripe 17 is fixedly provided on the vertical movement mechanism 10, and a vertical magnetic scale reading head 18 for detecting the vertical magnetic stripe 17 is fixedly provided on the lateral movement mechanism 20. When the lateral movement mechanism 20 moves up and down relative to the vertical movement mechanism 10, the vertical magnetic scale reading head 18 moves up and down together with the lateral movement mechanism 20, and at the same time, the vertical magnetic scale reading head 18 reads the vertical magnetic stripe 17, so that the height position of the lateral movement mechanism 20 can be known, thereby accurately controlling and constraining the movement of the vertical movement mechanism 10.

[0043] Further, such as Figure 7-8As shown, the lateral moving mechanism 20 includes a lateral rolling screw 23 driven by a motor 22 and two horizontally arranged lateral guide rails 24. Similarly, a reducer, bearings and other structures are also arranged between the motor 22 and the vertical rolling screw 23. In order to reduce wind resistance, the lateral moving mechanism 20 is also provided with a fairing 29 and other structures that wrap the motor 22 and the reducer. Since the vertical moving mechanism 10 is already a single-arm support structure, the two lateral guide rails 24 of the lateral moving mechanism 20 can be arranged in parallel. Of course, in order to increase the height, the two lateral guide rails 24 can also be arranged at right angles.

[0044] Corresponding to the structure on the lateral movement mechanism 20, such as Figure 9-10 As shown, the axial moving mechanism 30 is fixedly connected with a transverse screw nut 25 that cooperates with the transverse rolling screw 23, and the transverse screw nut 25 can move left and right along the transverse rolling screw 23 as the transverse rolling screw 23 rotates; the axial moving mechanism 30 is fixedly connected with two groups of transverse guide rail sliders 26 that cooperate with the transverse guide rail 24.

[0045] Similarly, in order to accurately control and constrain the left-right movement of the lateral moving mechanism 20 to manipulate the axial moving mechanism 30, a lateral magnetic stripe 27 is fixedly provided on the lateral moving mechanism 20, and a lateral magnetic scale reading head 28 for detecting the lateral magnetic stripe 27 is fixedly provided on the axial moving mechanism 30. When the axial moving mechanism 30 moves left and right relative to the lateral moving mechanism 20, the lateral magnetic scale reading head 28 moves left and right along with the axial moving mechanism 30, and at the same time, the lateral magnetic scale reading head 28 reads the lateral magnetic stripe 27, so that the left-right position of the axial moving mechanism 30 can be known, thereby accurately controlling and constraining the movement of the lateral moving mechanism 20.

[0046] Further, such as Figure 9-10 As shown, the axial moving mechanism 30 includes an axial rolling screw 33 driven by a motor 32, and an axial screw nut 35 is provided on the axial rolling screw 33, which can move forward and backward along the axial rolling screw 33 as it rotates; a plurality of guide rods 36 are arranged around the axial rolling screw 33, and the guide rods 36 are inserted into guide holes of a guide plate 34 fixedly connected to the axial screw nut 35; the measuring shaft 31 is fixedly connected to the guide plate 34.

[0047] Furthermore, in order to reduce wind resistance, a rectification guide cylinder 39 is provided on the outside of the guide rod 36, and a plurality of guide grooves 391 are provided on the inner side wall of the rectification guide cylinder 39, and the guide plate 34 has a protrusion 341 that matches the guide groove 391. In addition, a transition fairing 392 wrapped around the outside of the measuring shaft 31 may be further provided in front of the rectification guide cylinder 39.

[0048] Similarly, in order to accurately control and constrain the axial moving mechanism 30 to manipulate the forward and backward movement of the measuring shaft 31, an axial magnetic stripe 37 is fixedly provided on the inner side wall of the rectifying guide cylinder 39 of the axial moving mechanism 30, and an axial magnetic scale reading head 38 for detecting the axial magnetic stripe 37 is fixedly provided on the guide plate 34. When the measuring shaft 31 of the axial moving mechanism 30 is driven to move forward and backward, the axial magnetic scale reading head 38 moves forward and backward together with the guide plate 34 fixedly connected to the measuring shaft 31, and at the same time, the axial magnetic scale reading head 38 reads the axial magnetic stripe 37, so that the left and right position of the measuring shaft 31 can be known, thereby accurately controlling and constraining the movement of the measuring shaft 31 of the axial moving mechanism 30, and further controlling the precise position of the probe 1 and the height detector 2.

[0049] exist Fig.10 In the specific embodiment shown, multiple guide rods 36 are arranged in two layers around the axial rolling screw 33, that is, some guide rods 36 are close to the axial rolling screw 33, and some guide rods 36 are far from the axial rolling screw 33. The space between the two layers of guide rods 36 can be used to spirally wind the control cable 361, so that when the measuring shaft 31 moves back and forth, the control cable 361 can be freely extended and retracted without being pulled and broken. At the same time, arranging the control cable 361 between the two layers of guide rods 36 can prevent the control cable 361 from getting tangled or entangled with the measuring shaft 31, making it difficult to move.

[0050] In summary, the measuring device of the present invention adopts a single-arm support structure arranged facing the incoming flow direction of the wind tunnel, which is particularly suitable for measuring the boundary layer parameters of the model surface in a high-speed wind tunnel. The operating parts of the moving mechanism are all provided with a perfect rectifying structure, which can reduce wind resistance, avoid the influence on the wind tunnel flow field, and improve the accuracy of the wind tunnel simulation of the real boundary conditions such as temperature, pressure, and speed. In addition, the measuring device of the present invention provides a moving constraint mechanism, which can generate a dynamic response to the contour change of the outer surface of the model, so that the measuring probe can move accurately within the boundary layer thickness range, and can realize the accurate measurement of the boundary layer flow field under high-speed conditions.

[0051] In addition, the measurement method proposed in the present invention uses the static contour measured by the height detector as a reference, adds a safety height to the probe on the basis of the static contour, and then after the wind tunnel is running, adjusts the position of the measuring device through the contour detected in real time by the height detector, thereby controlling the precise movement of the probe and avoiding collision between the probe and the model.

[0052] Those skilled in the art should understand that although the present invention is described in the form of multiple embodiments, not every embodiment includes only one independent technical solution. Such description in the specification is only for the sake of clarity. Those skilled in the art should understand the specification as a whole and regard the technical solutions involved in each embodiment as being able to be combined into different embodiments to understand the scope of protection of the present invention.

[0053] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for measuring the boundary layer flow field of a high-speed wind tunnel model, characterized in that: The method comprises the following steps: setting a boundary layer flow field measurement device in a high-speed wind tunnel; the measurement device comprises a vertical moving mechanism, a lateral moving mechanism and an axial moving mechanism; the axial moving mechanism has a measuring shaft that can be extended and retracted along its length direction, and a probe and a height detector are arranged at the end of the measuring shaft for measuring boundary layer parameters; inputting a theoretical profile height L of a model to be measured into the measurement device; operating the measurement device to make the probe move once along a safety height of the theoretical profile height L plus a height h, and at the same time using the height detector to detect the actual height H of the probe from the model, and storing L+hH as the actual profile height P of the model in the measurement device; starting the high-speed wind tunnel, making the probe move to a position of the actual profile height P of the model plus the boundary layer height value t to be detected, and measuring the boundary layer parameters, and at the same time using the height detector to detect the dynamic height of the probe in real time and feed it back to the measurement device, and the measurement device corrects the height of the probe according to the dynamic height obtained by the measurement.

2. The measuring method according to claim 1, characterized in that: The method further comprises the following steps: moving the probe along the safety height to above the position to be measured, then using a height detector to detect the height of the probe from the model, operating the measuring device to lower the probe to a position at a height t from the model; after the measurement is completed, raising the probe to the safety height and moving it above the next position to be measured, and repeating the above steps to perform the measurement.

3. A boundary layer flow field measuring device for the measurement method of claim 1 or 2, comprising a vertical moving mechanism, a lateral moving mechanism and an axial moving mechanism; the vertical moving mechanism is connected to a support arm in a wind tunnel; the lateral moving mechanism is supported on the vertical moving mechanism and can move laterally on the vertical moving mechanism; the axial moving mechanism is supported on the lateral moving mechanism and can move telescopically along its length direction on the lateral moving mechanism; characterized in that: The axial moving mechanism has a measuring shaft which can be extended and retracted along its length direction, and a probe for measuring boundary layer parameters and a height detector are arranged at the end of the measuring shaft.

4. The measuring device according to claim 3, characterized in that The vertical moving mechanism includes a vertical rolling screw driven by a motor and two vertical guide rails arranged at right angles; a vertical screw nut that cooperates with the vertical rolling screw is fixedly connected to the horizontal moving mechanism, and the vertical screw nut can move up and down along the vertical rolling screw as the vertical rolling screw rotates; two groups of vertical guide rail sliders that cooperate with the vertical guide rails are fixedly connected to the horizontal moving mechanism.

5. The measuring device according to claim 4, characterized in that A vertical magnetic strip is fixedly arranged on the vertical moving mechanism, and a vertical magnetic scale reading head for detecting the vertical magnetic strip is fixedly arranged on the horizontal moving mechanism.

6. The measuring device according to claim 3, characterized in that The transverse moving mechanism includes a transverse rolling screw driven by a motor and two horizontally arranged transverse guide rails; a transverse screw nut that cooperates with the transverse rolling screw is fixedly connected to the axial moving mechanism, and the transverse screw nut can move left and right along the transverse rolling screw as the transverse rolling screw rotates; two transverse guide rail sliders that cooperate with the transverse guide rails are fixedly connected to the axial moving mechanism.

7. The measuring device according to claim 6, characterized in that A transverse magnetic strip is fixedly arranged on the transverse moving mechanism, and a transverse magnetic scale reading head for detecting the transverse magnetic strip is fixedly arranged on the axial moving mechanism.

8. The measuring device according to claim 3, characterized in that The axial movement mechanism includes an axial rolling screw driven by a motor, on which is provided an axial screw nut which can move forward and backward along the axial rolling screw as the axial rolling screw rotates; a plurality of guide rods are arranged around the axial rolling screw, and the guide rods are inserted into guide holes of a guide plate fixedly connected to the axial screw nut; the measuring shaft is fixedly connected to the guide plate.

9. The measuring device according to claim 8, characterized in that A rectifying guide cylinder is arranged on the outer side of the guide rod, a plurality of guide grooves are arranged on the inner side wall of the rectifying guide cylinder, and the guide plate has a protrusion matched with the guide groove.

10. The measuring device according to claim 9, characterized in that An axial magnetic strip is fixedly arranged on the inner side wall of the rectifying guide cylinder of the axial moving mechanism, and an axial magnetic scale reading head for detecting the axial magnetic strip is fixedly arranged on the guide plate.

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