A gas film flow field measurement device and its usage method

Abstract

An air film flow field measurement device and its usage method. The air film flow field measurement device includes: a first flat plate and a second flat plate; cold air is introduced into the cold air cavity and flows into the mainstream flow field through the air film holes opened on the flat plates, forming a symmetric air film flow field; a dynamic pressure sensor is arranged on one side of the first flat plate and is used to measure the pressure fluctuation on the flat plate surface caused by the air film flow field; a hot wire probe is arranged on one side close to the second flat plate in the air film flow field and is used to dynamically measure the velocity field in the air film flow field; a flat plate displacement mechanism is used to adjust the distance between the first flat plate and the second flat plate; a probe displacement mechanism is connected to the hot wire probe and is used to adjust the position of the hot wire probe in the normal direction in the air film flow field. Through the above structure, the problem that the existing air film flow field measurement device cannot achieve high-frequency acquisition of the velocity field and the flat plate pressure synchronously while minimizing the interference of the contact measurement on the flow field can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of research devices for film cooling of gas turbine blades, and particularly relates to a film flow field measuring device and a using method thereof. Background Art

[0002] Film cooling is an advanced cooling technology used in gas turbines to resist the erosion of high-temperature gas, which allows high-temperature flows exceeding the melting point of the blade material to enter the turbine, thereby achieving higher thermal efficiency through a higher inlet temperature. However, during the introduction of a large amount of cold air into the gas turbine, it will damage the flow field and cause mixing loss, thereby reducing the work capacity of the gas.

[0003] In order to reduce the mixing loss, it is necessary to understand the mixing process of the cold air and the mainstream and conduct fine dynamic measurements on the film flow field. Commonly used dynamic testing means in the prior art include hot-wire anemometers, dynamic pressure sensors, high-speed PIV, pressure-sensitive paint, etc. In order to achieve continuous high-frequency and high-precision acquisition, those skilled in the art mostly adopt contact measurement means, such as contact measurement devices like hot-wire anemometers and dynamic pressure sensors.

[0004] However, using contact measurement is likely to introduce flow field interference. Especially when multiple technologies are used in combination, the superimposed interference brought by the measurement equipment will seriously affect the measurement accuracy of the experiment. For simple dynamic flow field tests, a single test means can minimize the interference brought by the flow field and meet the basic research needs. But for the research on cold air mixing, both the film flow field and the cooling efficiency are key focus contents. The coupled measurement of the flow field velocity and the flat plate surface pressure is of great significance for analyzing the relationship between the mixing process and the cold effect distribution. Therefore, those skilled in the art need a film flow field measuring device to maximize the reduction of the interference problem caused by contact measurement while achieving high-frequency acquisition of the velocity field and the flat plate pressure synchronously. Summary of the Invention

[0005] The present invention aims to provide a film flow field measuring device to solve the problem in the prior art that the film flow field measuring device cannot maximize the reduction of the interference caused by contact measurement while achieving high-frequency acquisition of the velocity field and the flat plate pressure synchronously. To this end, the present invention provides a film flow field measuring device, including:

[0006] A first flat plate and a second flat plate, the first flat plate and the second flat plate are arranged opposite to each other to form a flow field for the mainstream to pass through;

[0007] A cold air introduction mechanism, which is connected to the mainstream flow field, and the cold air forms a cooling air film in the flow field;

[0008] A dynamic pressure sensor is arranged on one side of the first flat plate and is used for measuring the pressure fluctuation on the surface of the flat plate caused by the gas film flow field;

[0009] A hot-wire probe is arranged in the gas film flow field and is used for dynamically measuring the velocity field of the gas film flow field near the second flat plate;

[0010] A flat plate displacement mechanism is used for adjusting the distance between the first flat plate and the second flat plate;

[0011] A probe displacement mechanism is connected to the hot-wire probe and is used for adjusting the position of the hot-wire probe in the normal direction of the gas film flow field.

[0012] The flat plate displacement mechanism includes: a thrust rod arranged on one side of the first flat plate and abutting against the first flat plate, and a push rod control unit communicatively connected to the thrust rod to drive the telescopic distance of the thrust rod.

[0013] The dynamic pressure sensor is arranged on the first flat plate and on the same side as the thrust rod.

[0014] The probe displacement mechanism includes:

[0015] A hot-wire support, the hot-wire support is a columnar structure, and the hot-wire probe is arranged at one end of the hot-wire support facing the air inlet of the gas film flow field;

[0016] A displacement mechanism support, the displacement mechanism support is a sleeve structure sleeved and connected to the hot-wire support; the inside of the displacement mechanism support is hollow, allowing the hot-wire support to be telescopically adjusted along the flow field direction.

[0017] A support control unit is fixedly connected to the displacement mechanism support to drive the hot-wire support to move in the normal direction of the flow field.

[0018] Optionally, the displacement mechanism support is an L-shaped rod with one end extending in the length direction of the gas film flow field and the other end extending in the direction perpendicular to the gas film flow field. The L-shaped rod is hollow inside, allowing the hot-wire support to be telescopically adjusted along the normal direction of the flow field.

[0019] Optionally, the probe displacement mechanism includes:

[0020] A hot-wire support, the hot-wire support is a long strip structure, and the hot-wire probe is arranged at one end of the hot-wire support facing the air inlet of the gas film flow field;

[0021] A displacement mechanism driving frame, the displacement mechanism driving frame is perpendicular to the length direction of the hot-wire support, a driving wheel is arranged at one end of the displacement mechanism driving frame facing the hot-wire support, and a gear is arranged on the hot-wire support in the length direction and meshes with the driving wheel;

[0022] The displacement mechanism driving frame is communicatively connected to the driving wheel, and drives the driving wheel to rotate to drive the telescopic movement of the hot wire support.

[0023] The support control unit is fixedly connected to the displacement mechanism driving frame, and drives the displacement mechanism driving frame and the hot wire support connected thereto through the engaging teeth to move along the normal direction of the flow field.

[0024] Optionally, the cold air introducing mechanism includes: a cold air chamber and an air film channel; the cold air chamber is used to supply cold air to the air film channel.

[0025] Optionally, there are two cold air chambers, which are respectively arranged on one side of the first plate and the second plate away from the inner cavity of the air film channel;

[0026] The two cold air chambers are connected to the same gas source, and the equal air film flow fields on both sides of the first plate and the second plate are realized by the valves and flow meters arranged at the outlet positions of the cold air chambers.

[0027] A method for using the air film flow field measuring device includes the following steps:

[0028] Adjust the distance L between the hot wire probe and the displacement mechanism support by the telescopic distance of the probe support in the displacement mechanism support, so as to reduce the measurement interference of the displacement mechanism support introducing the flow field on the hot wire probe.

[0029] Adjust the relative positions of the first plate and the second plate through the flat plate displacement mechanism until the spectral characteristics of the measurement data of the dynamic pressure sensor do not change significantly due to the increase in the distance between the first plate and the second plate, so as to reduce the mutual interference between the symmetric air film flow fields and reduce the measurement interference of the dynamic pressure sensor.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The air film flow field measuring device provided by the present invention includes: a first plate and a second plate, the first plate and the second plate are oppositely arranged to form a main flow field for the air flow to pass through; a cold air introducing mechanism, which is communicated with the main flow field, and the cold air forms a cooling air film in the flow field; a dynamic pressure sensor, which is arranged on one side of the first plate and is used to measure the pressure fluctuation on the surface of the plate caused by the air film flow field; a hot wire probe, which is arranged in the air film flow field and is used to dynamically measure the velocity field of the air film flow field near the second plate; a flat plate displacement mechanism, which is used to adjust the distance between the first plate and the second plate; a probe displacement mechanism, which is connected to the hot wire probe and is used to adjust the position of the hot wire probe in the normal direction of the air film flow field.

[0032] In the present invention, an air film flow field is formed by a first flat plate and a second flat plate, and a cooling environment of a gas turbine is simulated in the above-mentioned air film flow field through a cold air introduction mechanism. Furthermore, continuous high-frequency and high-precision data acquisition is achieved through a dynamic pressure sensor and a hot wire probe. The combination of the above-mentioned dynamic pressure sensor and the hot wire probe can realize the coupled measurement of the velocity and pressure of the entire flow field. However, the hot wire probe arranged in the air film flow field will interfere with the flow field in the air film flow field. In order to reduce the problem of flow field interference, in the present invention, a flat plate displacement mechanism for adjusting the distance between the first flat plate and the second flat plate, and a probe displacement mechanism for adjusting the position of the hot wire probe in the air flow direction in the air film flow field are also provided. The dynamic pressure sensor is arranged on the first flat plate and is used to adjust the relative position between the first flat plate and the second flat plate so that the spectral characteristics of the measurement data of the dynamic pressure sensor will not change significantly due to the change of its distance. In addition, the probe displacement mechanism enables the hot wire probe to be adjusted arbitrarily in the air flow direction in the air film flow field, so that the hot wire probe can find a position during the position adjustment process where the change in the position of the hot wire probe has a small impact on the measurement data of the hot wire probe.

[0033] 2. The air film flow field measurement device provided by the present invention, wherein the flat plate displacement mechanism includes: a thrust rod arranged on one side of the first flat plate and abutted against the first flat plate, and a push rod control unit communicatively connected to the thrust rod to drive the telescopic distance of the thrust rod.

[0034] In the present invention, the first flat plate or the second flat plate is driven by the thrust rod, so as to achieve the purpose that one flat plate is stationary and the other flat plate moves towards the stationary flat plate, and thus the relative position between the first flat plate and the second flat plate can be simply and reliably adjusted through the thrust rod.

[0035] 3. The air film flow field measurement device provided by the present invention, wherein the dynamic pressure sensor is arranged on the first flat plate or the second flat plate and is arranged on the same side as the thrust rod.

[0036] In the present invention, by arranging the dynamic pressure sensor and the thrust rod on the flat plate on the same side, the dynamic pressure sensor can be closer to the moving flat plate, so that when the above-mentioned moving flat plate moves, the pressure fluctuation change on the surface of the flat plate caused by the air film flow field can be detected more quickly and accurately, and thus the dynamic test of the flow field can be realized more precisely and comprehensively.

[0037] 4. The air film flow field measurement device provided by the present invention, wherein the probe displacement mechanism includes: a hot wire support, the hot wire support is a columnar structure, and the hot wire probe is arranged at one end of the hot wire support facing the air inlet of the air film flow field; a displacement mechanism support, the displacement mechanism support is a sleeve structure sleeved and connected with the hot wire support; the interior of the displacement mechanism support is hollow to allow the hot wire support to expand and contract along the length direction of the air film flow field; a support control unit, fixedly connected with the displacement mechanism support to drive the hot wire support to move along the normal direction of the flow field.

[0038] 5. The air film flow field measurement device provided by the present invention, wherein the displacement mechanism support is an L-shaped rod with one end extending towards the length direction of the air film flow field and the other end extending along the vertical direction of the air film flow field, and the L-shaped rod is hollow inside to allow the hot wire support to expand and contract.

[0039] In the present invention, by setting the displacement mechanism support as an L-shaped rod structure, the displacement mechanism support of the L-shaped rod extends beyond the flow field direction of the air film flow field, so that the device used to drive and control the displacement mechanism support is far away from the air film flow field, thereby effectively reducing the problem of disturbance of the external transmission mechanism to the flow field.

[0040] 6. The air film flow field measurement device provided by the present invention, wherein the probe displacement mechanism includes: a hot wire support, the hot wire support is a strip-shaped structure, and the hot wire probe is arranged at one end of the hot wire support facing the air inlet of the air film flow field; a displacement mechanism drive frame, the displacement mechanism drive frame is perpendicular to the length direction of the hot wire support, a driving wheel is arranged at one end of the displacement mechanism drive frame facing the hot wire support, and a tooth is arranged on the hot wire support in the length direction to engage with the driving wheel; a support control unit, fixedly connected with the displacement mechanism support, driving the displacement mechanism support and the hot wire support connected thereto through the tooth to move along the normal direction of the flow field.

[0041] In the present invention, the hot wire support is driven to expand and contract along its length direction by the driving wheel. Since the driving wheel can be driven to rotate by a synchronous motor, the position of the hot wire probe in the air film flow field can be accurately and finely adjusted, thereby effectively reducing the problem of disturbance of the external transmission mechanism to the flow field.

[0042] 7. The air film flow field measurement device provided by the present invention, wherein there are two cold air cavities, which are respectively arranged on one side of the first flat plate and the second flat plate away from the inner cavity of the air film channel; the two cold air cavities are connected to the same gas source, and the equal air film flow fields on both sides of the first flat plate and the second flat plate are realized by valves and flow meters arranged at the outlet positions of the cold air cavities.

[0043] In the present invention, by respectively providing a cold air chamber and an air film channel for air supply on the first flat plate and the second flat plate, the above structure realizes a symmetric air film flow field, thereby minimizing the flow field interference problem caused by the synchronous acquisition of the hot wire probe and the dynamic pressure sensor.

[0044] 8. The method for using the air film flow field measuring device provided by the present invention includes the following steps: adjusting the position of the hot wire probe in the length direction within the air film flow field through the probe displacement mechanism to reduce the measurement interference of the hot wire probe caused by the displacement mechanism bracket introduced into the flow field; adjusting the relative positions of the first flat plate and the second flat plate through the flat plate displacement mechanism until the spectral characteristics of the measurement data of the dynamic pressure sensor do not change significantly due to the increase in the distance between the first flat plate and the second flat plate, so as to reduce the mutual interference between the symmetric air film flow fields and reduce the measurement interference of the dynamic pressure sensor.

[0045] In the present invention, by adjusting the position of the hot wire probe in the air film flow field through the probe displacement mechanism, it is possible to effectively reduce the measurement interference of the hot wire probe caused by the displacement mechanism bracket introduced into the flow field. In addition, in the present invention, by adjusting the relative positions of the first flat plate and the second flat plate through the flat plate displacement mechanism, the mutual interference between the symmetric air film flow fields can be reduced, and the measurement interference of the hot wire anemometer introduced into the flow field on the dynamic pressure sensor can be reduced.

[0046] 9. The method for using the air film flow field measuring device provided by the present invention, wherein the dynamic pressure sensor is arranged on the first flat plate, and the flat plate displacement mechanism is connected to the first flat plate to drive it towards or away from the second flat plate, so as to reduce the mutual interference between the symmetric air film flow fields and reduce the measurement interference of the hot wire anemometer introduced into the flow field on the dynamic pressure sensor.

[0047] In the present invention, by fixedly arranging the second flat plate and arranging the dynamic pressure sensor on the first flat plate, and driving the first flat plate to move, thereby changing the distance between the first flat plate and the second flat plate, the above method can simply and effectively control the mutual interference between the symmetric air film flow fields and reduce the measurement interference caused by the hot wire anemometer introduced into the flow field. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Structural schematic diagram of the air film flow field measuring device with an L-shaped displacement mechanism bracket provided by the present invention;

[0050] Figure 2 Schematic structural diagram of the gas film flow field measuring device provided by the present invention, which drives the telescopic movement of the hot wire bracket through a driving wheel.

[0051] Description of the reference numerals:

[0052] 1 - First flat plate; 2 - Second flat plate; 3 - Dynamic pressure sensor; 4 - Hot wire probe; 5 - Thrust rod; 6 - Push rod control unit; 7 - Hot wire bracket; 8 - Displacement mechanism bracket; 9 - Bracket control unit; 10 - Displacement mechanism drive frame; 11 - Driving wheel; 12 - Cold air chamber; 13 - Gas film channel. Detailed implementation manners

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0056] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0057] Embodiment 1

[0058] Describes a gas film flow field measuring device, as Figure 1As shown, it includes: a first flat plate 1 and a second flat plate 2, and the first flat plate 1 and the second flat plate 2 are arranged opposite to each other to form a main flow field for the main flow to pass through;

[0059] A cold air introduction mechanism, which is connected to the main flow field, and the cold air forms a cooling air film in the air film flow field; the above-mentioned cold air introduction mechanism includes: a cold air cavity 12 and an air film channel 13; the cold air cavity 12 is used to supply cold air to the air film channel 13. And there are two cold air cavities 12, which are respectively arranged on the sides of the first flat plate 1 and the second flat plate 2 away from the inner cavity of the air film channel 13; the two cold air cavities 12 are connected to the same air source, and the symmetrical air film flow fields on both sides of the first flat plate 1 and the second flat plate 2 are realized through valves and flow meters arranged at the outlet positions of the cold air cavities 12;

[0060] A dynamic pressure sensor 3 is arranged on the side of the first flat plate 1 away from the air film flow field, and is used to measure the pressure fluctuation on the surface of the flat plate caused by the air film flow field; a hot wire probe 4 is arranged in the air film flow field, and is used to dynamically measure the velocity field in the air film flow field;

[0061] The flat plate displacement mechanism is used to adjust the distance between the first flat plate 1 and the second flat plate 2; in this embodiment, as Figure 1 shown, the flat plate displacement mechanism includes: a thrust rod 5 arranged on the first flat plate 1 and abutting against the first flat plate 1, and a push rod control unit 6 communicatively connected to the thrust rod 5 to drive the telescopic distance of the thrust rod 5. The above-mentioned dynamic pressure sensor 3 is arranged on the first flat plate 1 or the second flat plate 2, and is on the same side as the thrust rod 5. By adjusting the distance between the first flat plate 1 and the second flat plate, the mutual interference between the symmetrical air film flow fields is reduced, and the measurement interference brought by the introduction of the hot wire anemometer into the flow field measurement to the dynamic pressure sensor 3 is reduced;

[0062] The probe displacement mechanism is connected to the hot wire probe 4 and is used to adjust the position of the hot wire probe 4 in the air flow direction in the air film flow field. In this embodiment, as Figure 1The probe displacement mechanism shown includes: a hot-wire support 7, which is of a columnar structure, and the hot-wire probe 4 is arranged at one end of the hot-wire support 7 facing the air film flow field inlet; a displacement mechanism support 8, which is a sleeve structure sleeved and connected with the hot-wire support 7; the interior of the displacement mechanism support 8 is hollow to allow the hot-wire support 7 to expand and contract along the length direction of the air film flow field; a support control unit 9, which is fixedly connected to the displacement mechanism support 8 to drive the hot-wire support 7 to move in the normal direction. Moreover, in order to reduce the interference caused by the hot-wire anemometer introduced into the flow field to the measurement, an L displacement mechanism support 8 is used. One end is connected to the hot-wire support 7 along the flow field direction, and the other end is led out along the normal direction of the flow field and fixedly connected to the support control unit 9. By adjusting the distance L between the hot-wire probe 4 and the displacement mechanism support 8, the measurement interference caused by the hot-wire measurement device introduced into the flow field to the upstream hot-wire probe 4 can be effectively reduced.

[0063] The usage method of the air film flow field measurement device includes the following steps:

[0064] S1, adjust the distance L between the hot-wire probe 4 and the displacement mechanism support through the probe displacement mechanism until the measurement data of the hot-wire probe 4 no longer changes significantly due to the change in the distance between the two;

[0065] S2, adjust the relative positions of the first flat plate 1 and the second flat plate 2 through the flat plate displacement mechanism until the spectral characteristics of the measurement data of the dynamic pressure sensor 3 do not change due to the change in the distance between the two.

[0066] Of course, in this embodiment, the composition structure of the air film flow field measurement device is not specifically limited. In other embodiments, the air film flow field measurement device only sets one of the flat plate displacement mechanism and the probe displacement mechanism.

[0067] Of course, in this embodiment, the installation position of the dynamic pressure sensor 3 is not specifically limited. In other embodiments, the dynamic pressure sensor 3 can also be arranged on the side of the second flat plate 2 away from the air film flow field. The first flat plate 1 moves towards or away from the second flat plate 2 under the drive of the flat plate displacement mechanism.

[0068] Of course, in this embodiment, the driving object of the flat plate displacement mechanism is not specifically limited. In other embodiments, the flat plate displacement mechanism can also drive the first flat plate 1 and the second flat plate 2 to move simultaneously.

[0069] Of course, in this embodiment, the installation position of the dynamic pressure sensor 3 is not specifically limited. In other embodiments, the dynamic pressure sensor 3 can also be arranged on both the first flat plate 1 and the second flat plate 2 simultaneously.

[0070] Of course, in this embodiment, the composition structure of the cold air introduction mechanism is not specifically limited. In other embodiments, the cold air cavity 12 may also be provided only on one side of the first flat plate 1 and the second flat plate 2. And the cold air cavity 12 and the gas film channel 13 form a group.

[0071] Of course, in this embodiment, the relative positions of the first flat plate 1 and the second flat plate 2 are not specifically limited either. In other embodiments, the first flat plate 1 and the second flat plate 2 may be replaced with: the first flat plate 1 is below and the second flat plate 2 is above the first flat plate 1.

[0072] Embodiment 2

[0073] A gas film flow field measurement device is described, as Figure 2 shown, including: a first flat plate 1 and a second flat plate 2, the first flat plate 1 and the second flat plate 2 are arranged opposite to each other to form a mainstream flow field for the mainstream to pass through;

[0074] A cold air introduction mechanism, which is connected to the mainstream flow field, and the cold air forms a cooling gas film in the gas film flow field;

[0075] A dynamic pressure sensor 3 is arranged on the side of the first flat plate 1 away from the gas film flow field for measuring the pressure fluctuation on the flat plate surface caused by the gas film flow field; a hot wire probe 4 is arranged in the gas film flow field for dynamically measuring the velocity field of the gas film flow field close to the second flat plate 2;

[0076] The flat plate displacement mechanism is used to adjust the distance between the first flat plate 1 and the second flat plate 2; in this embodiment, as Figure 2 shown, the flat plate displacement mechanism includes: a thrust rod 5 arranged on the first flat plate 1 and abutting against the first flat plate 1, and a push rod control unit 6 communicatively connected to the thrust rod 5 to drive the thrust rod 5 to expand and contract. The above dynamic pressure sensor 3 is arranged on the first flat plate 1 or the second flat plate 2 and on the same side as the thrust rod 5. By adjusting the distance between the first flat plate 1 and the second flat plate, the mutual interference between the symmetric gas film flow fields is reduced, and the measurement interference brought by the introduction of the hot wire anemometer into the flow field measurement to the dynamic pressure sensor 3 is reduced;

[0077] The probe displacement mechanism is connected to the hot wire probe 4 and is used to adjust the position of the hot wire probe 4 in the air flow direction in the gas film flow field. In this embodiment, as Figure 2The probe displacement mechanism shown includes: a hot wire support 7, the hot wire support 7 being a long strip structure, and the hot wire probe 4 being arranged at one end of the hot wire support 7 facing the air film flow field air inlet; a displacement mechanism drive frame 10, the displacement mechanism drive frame 10 being perpendicular to the length direction of the hot wire support 7, a drive wheel 11 being arranged at one end of the displacement mechanism drive frame 10 facing the hot wire support 7, and a toothed gear meshing with the drive wheel 11 being arranged in the length direction of the hot wire support 7; a support control unit 9, being communicatively connected to the drive wheel 11 and driving the drive wheel 11 to rotate so as to drive the telescopic movement of the hot wire support 7.

[0078] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. An air film flow field measurement device, characterized in that, Comprising: A first flat plate (1) and a second flat plate (2), the first flat plate (1) and the second flat plate (2) being symmetrically arranged; Cooling air is introduced into the cooling air cavity and flows into the mainstream flow field through the film holes opened on the flat plates, forming a symmetric film flow field; a dynamic pressure sensor (3) is arranged on one side of the first flat plate (1) and / or the second flat plate (2) away from the film flow field for measuring the pressure fluctuation on the surface of the flat plate caused by the film flow field; A hot-wire probe (4) is arranged in the film flow field for dynamically measuring the velocity field in the film flow field; The film flow field measuring device further includes: a flat plate displacement mechanism and a probe displacement mechanism; the flat plate displacement mechanism is used to adjust the distance between the first flat plate (1) and the second flat plate (2); the probe displacement mechanism is connected to the hot-wire probe (4) and is used to adjust the position of the hot-wire probe (4) in the normal direction in the film flow field; The cooling air introducing mechanism includes: a cooling air cavity (12) and a film channel (13); the cooling air cavity (12) is used to supply cooling air to the film channel (13); There are two cooling air cavities (12), which are respectively arranged on one side of the first flat plate (1) and the second flat plate (2) away from the inner cavity of the film channel (13); the two cooling air cavities (12) are connected to the same air source, and a symmetric film flow field on both sides of the first flat plate (1) and the second flat plate (2) is realized through a valve and a flowmeter arranged at the outlet position of the cooling air cavity (12).

2. The air film flow field measurement device according to claim 1, characterized in that The flat plate displacement mechanism includes: a thrust rod (5) arranged on one side of the first flat plate (1) and the second flat plate (2) and abutted against one of the first flat plate (1) and the second flat plate (2), and a push rod control unit (6) communicatively connected to the thrust rod (5) to drive the telescopic distance of the thrust rod (5).

3. The air film flow field measurement device according to claim 2, characterized in that, The dynamic pressure sensor (3) is arranged on the first flat plate (1) or the second flat plate (2) and on the same side as the thrust rod (5).

4. The air film flow field measurement device according to any one of claims 1 to 3, characterized in that, The probe displacement mechanism includes: A hot-wire support (7), the hot-wire support (7) is a columnar structure, and the hot-wire probe (4) is arranged at one end of the hot-wire support (7) facing the air inlet of the film flow field; a displacement mechanism support (8), the displacement mechanism support (8) is a sleeve structure sleeved and connected with the hot-wire support (7); the displacement mechanism support (8) is connected to the displacement mechanism to drive the hot-wire support (7) to move along the normal direction of the film flow field; A support control unit (9) is fixedly connected to the displacement mechanism support (8) to drive the hot-wire support (7) to move along the normal direction of the flow field.

5. The air film flow field measurement device according to claim 4, wherein, The displacement mechanism support (8) is an L-shaped rod with one end extending in the length direction of the film flow field and the other end extending in the normal direction of the film flow field. The L-shaped rod has a hollow structure inside to drive the hot-wire support (7) to perform telescopic actions along the flow direction of the flow field.

6. The air film flow field measurement device according to any one of claims 1 to 3, characterized in that, The probe displacement mechanism includes: Hot wire support (7), the hot wire support (7) is of a strip-shaped structure, and the hot wire probe (4) is arranged at one end of the hot wire support (7) facing the air film flow field inlet; Displacement mechanism drive frame (10), the displacement mechanism drive frame (10) is perpendicular to the length direction of the hot wire support (7), and a driving wheel (11) is arranged at one end of the displacement mechanism drive frame (10) facing the hot wire support (7), and engaging teeth are arranged on the hot wire support (7) in the length direction to engage with the driving wheel (11); The displacement mechanism drive frame (10) is communicatively connected to the driving wheel (11) to drive the driving wheel (11) to rotate so as to drive the hot wire support (7) to perform a telescopic action; Support control unit (9), fixedly connected to the displacement mechanism drive frame (10), driving the displacement mechanism drive frame (10) and the hot wire support (7) connected thereto through engaging teeth to move in the normal direction of the flow field.

7. A method for using the air film flow field measurement device according to any one of claims 1 to 6, characterized in that, Comprising the following steps: Adjust the telescopic distance of the probe support (7) in the displacement mechanism support (8) to adjust the distance L between the hot wire probe and the displacement mechanism support (8), so as to reduce the measurement interference of the displacement mechanism support introduced into the flow field on the hot wire probe (4); Adjust the relative positions of the first flat plate (1) and the second flat plate (2) through the flat plate displacement mechanism until the spectral characteristics of the measurement data of the dynamic pressure sensor (3) do not change significantly due to the increase in the distance between the first flat plate (1) and the second flat plate (2), so as to reduce the mutual interference between the symmetric air film flow fields and reduce the measurement interference of the dynamic pressure sensor (3).

8. The method for using the air film flow field measuring device according to claim 7, characterized in that, The dynamic pressure sensor (3) is arranged on the first flat plate (1), and the flat plate displacement mechanism is connected to the first flat plate (1) to drive it to face or move away from the second flat plate (2), so as to reduce the change of the spectral characteristics of the measurement data of the dynamic pressure sensor (3) with the change of the distance between the first flat plate (1) and the second flat plate (2).

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