Wind tunnel experiment device and method suitable for measuring force of power transmission conductor under action of inclined wind

Abstract

The application relates to a wind tunnel experiment device and method suitable for measuring the force of a power transmission conductor under the action of an inclined wind, which comprises a wind tunnel, a rotating base, an upper end plate, a lower end plate, a multi-split conductor model and an automatic telescopic mechanism; the rotating base is rotationally connected with the wind tunnel; the upper end plate is arranged in the wind tunnel and located above the lower end plate; the lower end plate is arranged in the wind tunnel and fixedly connected with the rotating base; the upper end plate and the lower end plate are movably connected with the upper and lower ends of the multi-split conductor model respectively; an icing model is connected to the multi-split conductor model; the automatic telescopic mechanism is movably connected with the upper end plate and used for driving the upper end plate to move relative to the lower end plate, so that the inclination angle of the multi-split conductor model relative to a horizontal plane is adjusted. The wind tunnel experiment device can be used for detecting the influence of inclined winds at various angles on the aerodynamic characteristic parameters of a conductor, and can simulate the real-time change of a wind direction in a natural environment, so that the influence of the wind direction change on the aerodynamic parameters of the conductor can be studied. The device has the advantages of simple and reliable structure, easy disassembly and assembly and high measurement precision.

Description

Technical Field

[0001] This invention relates to the field of aerodynamic analysis technology for power transmission lines, and in particular to a wind tunnel experimental apparatus and method for measuring the force of power transmission lines under oblique wind conditions. Background Technology

[0002] The aerodynamic characteristics of icing conductors are key parameters for studying conductor galloping. To ensure the safe operation of transmission lines and avoid accidents, it is essential to study the aerodynamic characteristics of icing conductors. Wind tunnel testing is currently a very important and commonly used research method.

[0003] In wind tunnel testing of the aerodynamic characteristics of icing conductors, studying the aerodynamic characteristics of conductors under oblique wind is essential and crucial. To simulate actual conductor wind conditions, and considering engineering convenience and practicality, a 1.4m × 1.4m low-speed wind tunnel is currently used in China. This 1.4m × 1.4m wind tunnel serves as a guide wind tunnel for the 8m × 6m large low-speed wind tunnel. Currently, this wind tunnel is positioned as a research-oriented wind tunnel for flow mechanism research, preliminary research on experimental technologies, and wind engineering and wind energy testing.

[0004] The traditional method for measuring the aerodynamic characteristics of conductors involves rigidly connecting the conductor to the center of the wind tunnel and fixing the conductor's installation position. This makes it difficult to measure the aerodynamic characteristics of the conductor under varying wind conditions. Currently, there is a lack of research on this issue both domestically and internationally. Therefore, how to fill this gap from an engineering perspective and minimize the cost of wind tunnel testing equipment is of great value and significance. Summary of the Invention

[0005] This application provides a wind tunnel experimental apparatus and method for measuring the force of transmission lines under oblique wind conditions in order to solve the above-mentioned technical problems.

[0006] This application is achieved through the following technical solution:

[0007] The wind tunnel experimental apparatus for measuring the force on power transmission lines under oblique wind conditions provided in this application includes:

[0008] Wind tunnel;

[0009] The upper end plate is installed inside the wind tunnel and located above the lower end plate;

[0010] The lower end plate is rotatably mounted inside the wind tunnel and can rotate relative to the wind tunnel around a first rotation center, which is perpendicular to the axis of the wind tunnel.

[0011] The multi-split conductor model is movably connected to the upper end plate and the lower end plate at its top and bottom ends, respectively. The multi-split conductor model may or may not be connected to the icing model.

[0012] An automatic telescopic mechanism, movably connected to the upper end plate, is used to move the upper end plate relative to the lower end plate, thereby adjusting the tilt angle of the multi-split wire model with respect to the horizontal plane.

[0013] The automatic telescopic machine can rotate relative to the wind tunnel around a second rotation center, which is parallel to or coincides with the first rotation center.

[0014] In particular, the wind tunnel experimental device for measuring the force of transmission lines under oblique wind also includes a rotating base and a connecting rod. The rotating base is rotatably connected to the wind tunnel and can rotate relative to the wind tunnel around the first rotation center. The lower end plate is fixedly connected to the rotating base.

[0015] The connecting rod is rotatably connected to the wind tunnel, and the connecting rod can rotate relative to the wind tunnel around a second rotation center, which is parallel to or coincides with the first rotation center; the upper end of the automatic telescopic machine is movably connected to the connecting rod, and the lower end of the automatic telescopic machine is movably connected to the upper end plate.

[0016] Optionally, the automatic telescopic mechanism is connected to the center position of the upper end plate, and the rotating base is connected to the center position of the lower end plate.

[0017] Specifically, the central axis of the rotating base coincides with the first rotation center, and the central axis of the connecting rod coincides with the second rotation center.

[0018] Optionally, the rotating base passes through the lower wall of the wind tunnel and connects to the motor outside the wind tunnel; the connecting rod passes through the upper wall of the wind tunnel and is fixedly connected to the upper turntable outside the wind tunnel.

[0019] Specifically, the lower end of the automatic telescopic machine is rotatably connected to the upper end plate via a shaft, and the upper end of the automatic telescopic machine is rotatably connected to the connecting rod via a shaft.

[0020] Specifically, the upper and lower ends of the multi-split wire model are rotatably connected to the upper end plate and the lower end plate via shafts, respectively.

[0021] Optionally, balances are fixedly installed on the upper and lower end plates respectively, with the two balances corresponding to the upper and lower parts of the same multi-split duct model.

[0022] The automatic telescopic mechanism can be any one of a hydraulic rod, an electric telescopic rod, or a cylinder.

[0023] This application provides a wind tunnel experimental method for measuring the force on transmission lines under oblique wind conditions, which utilizes the aforementioned wind tunnel experimental apparatus. The wind tunnel experimental method includes the following steps:

[0024] The angle between the multi-split traverse model and the horizontal plane is adjusted by an automatic telescopic mechanism;

[0025] The multi-split duct model undergoes slight deformation under wind force, which in turn pulls the upper and lower end plates to undergo slight deformation. The minute deformation of the end plates can be obtained through the balances at both ends. Finally, the aerodynamic parameters of the duct model are measured and transmitted through the balances.

[0026] Optionally, before the fan starts operating, the initial angle of attack of the multi-split wire model can be adjusted by rotating an external motor connected to the lower end plate.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] 1. This application changes the direction of the crosswind by using an automatic telescopic mechanism in the existing wind tunnel to change the inclination angle of the conductor;

[0029] 2. This application, by changing the tilt angle of the wind, can keep the upper and lower end plates parallel to the horizontal direction, maintain the normal airflow of the original wind tunnel test, and will not cause interference or have any side effects.

[0030] 3. The wind tunnel experimental device of this application can be applied to commonly used wind tunnel experiments. It is simple in structure and easy to implement, has low manufacturing difficulty, and its hydraulic control system is common and easy to control. From the perspective of engineering convenience and practicality, it has a certain degree of applicability. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of the present invention.

[0032] Figure 1 This is a schematic diagram of the wind tunnel experimental setup in the embodiment;

[0033] Figure 2 This is a side view of the multi-split wire model in the embodiment;

[0034] Figure 3 yes Figure 2 Sectional view at point AA;

[0035] Figure 4 This is a schematic diagram of the connection between the multi-split wire model and the lower end plate in the embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] like Figure 1 As shown, the wind tunnel experimental device for measuring the force of transmission lines under oblique wind conditions disclosed in this embodiment includes a wind tunnel 1, a hydraulic rod 2, a balance 3, a rotating base 4, a connecting rod 5, an upper end plate 6, a multi-split conductor model 8, and a lower end plate 9.

[0043] The rotating base 4 is rotatably connected to the wind tunnel 1. The rotating base 4 can rotate relative to the wind tunnel 1 around a first rotation center, which is perpendicular to the axis of the wind tunnel 1. The connecting rod 5 is rotatably connected to the wind tunnel 1. The connecting rod 5 can rotate relative to the wind tunnel 1 around a second rotation center, which is perpendicular to the axis of the wind tunnel 1. The first rotation center is parallel to the second rotation center.

[0044] Both the upper end plate 6 and the lower end plate 9 are installed inside the wind tunnel 1. The lower end plate 9 is located above the rotating base 4 and is fixedly connected to the rotating base 4. The upper end of the hydraulic rod 2 is movably connected to the connecting rod 5, and the lower end of the hydraulic rod 2 is movably connected to the upper end plate 6.

[0045] like Figure 4 As shown, the upper and lower ends of the multi-split conductor model 8 are rotatably connected to the upper end plate 6 and the lower end plate 9 via shafts, respectively.

[0046] like Figure 2 , Figure 3 As shown, in one possible design, the multi-split conductor model 8 is rigidly connected to the icing model 7.

[0047] Balances 3 are fixedly mounted on the upper end plate 6 and the lower end plate 9, respectively. In one possible design, as shown in the figure, the two balances 3 are fixed to the upper end plate 6 and the lower end plate 9 with bolts, respectively, and correspond to the upper and lower parts of the same conductor.

[0048] In one possible design, the lower end of the hydraulic rod 2 is rotatably connected to the upper end plate 6 via a shaft, and the upper end of the hydraulic rod 2 is rotatably connected to the connecting rod 5 via a shaft. Specifically, the hydraulic rod 2 is connected to the center position of the upper end plate 6, and the rotating base 4 is connected to the center position of the lower end plate 9.

[0049] In one possible design, the central axis of the rotating base 4 coincides with the first rotation center, and the central axis of the connecting rod 5 coincides with the second rotation center. Specifically, the first rotation center coincides with the second rotation center.

[0050] In one possible design, the rotating base 4 passes through the lower wall of the wind tunnel 1 and connects to a motor (not shown in the figure) outside the wind tunnel 1. The rotation of the motor can drive the lower end plate 9 to rotate, thereby adjusting the initial angle of attack of the multi-split conductor model 8.

[0051] In one possible design, the connecting rod 5 passes through the upper wall of the wind tunnel 1 and is fixedly connected to the upper turntable outside the wind tunnel 1. Specifically, the connecting rod 5 is connected to the flange of the upper turntable by bolts and locating pins.

[0052] In one possible design, wind tunnel 1 is a 1.4m × 1.4m low-speed wind tunnel.

[0053] In one possible design, multi-split conductor model 8 is a four-split conductor.

[0054] In one possible design, Balance 3 is a DXTP balance.

[0055] The wind tunnel experimental setup described in this application can be used to detect the aerodynamic characteristics of conductors under various angles of oblique wind, and can simulate real-time changes in wind direction under natural conditions, which is beneficial for studying the influence of wind direction changes on conductor aerodynamic parameters. This wind tunnel experimental setup has a simple and reliable structure, is easy to assemble and disassemble, and offers high measurement accuracy.

[0056] Based on the aforementioned wind tunnel experimental setup, this embodiment discloses a wind tunnel experimental method suitable for force measurement of transmission lines under oblique wind conditions, comprising the following steps:

[0057] The windward angle of the multi-split conductor model 8 is adjusted by the telescopic hydraulic rod 2;

[0058] The multi-split conductor model 8 undergoes slight deformation under wind force, which in turn pulls the upper end plate 6 and the lower end plate 9 to undergo slight deformation. The small deformation of the end plates can be obtained through the balances 3 at both ends. Finally, the aerodynamic parameters of the conductor model are measured and transmitted through the balances 3.

[0059] Optionally, before the fan starts working, the initial angle of attack of the multi-split wire model 8 can be adjusted by rotating an external motor connected to the lower end plate 9.

[0060] In this embodiment, the tilt angle between the multi-split conductor model 8 and the ground is adjusted by controlling the length of the hydraulic rod 2, thereby changing the windward angle. The changes in aerodynamic parameters are studied using real-time data transmitted by the balance 3.

[0061] In one possible design, the hydraulic rod 2 can be replaced with an electric telescopic rod, a cylinder, or other automatic telescopic mechanism.

[0062] In this embodiment, the influence of the slanted wind direction on the icing conductor is realized by adjusting the tilt angle of the conductor through an automatic telescopic mechanism in a low-speed wind tunnel. After the conductor is subjected to wind force and rotates along the vertical line of the wind tunnel axis, the drag, lift, and torque of the conductor model are measured by a balance.

[0063] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wind tunnel experimental apparatus suitable for measuring the force on power transmission lines under oblique wind conditions, characterized in that: include: Wind tunnel (1); The upper end plate (6) is installed inside the wind tunnel (1) and located above the lower end plate (9); The lower end plate (9) is rotatably mounted inside the wind tunnel (1) and can rotate relative to the wind tunnel (1) around the first rotation center, which is perpendicular to the axis of the wind tunnel (1); The multi-split conductor model (8) is movably connected to the upper end plate (6) and the lower end plate (9) at its upper and lower ends, respectively. The multi-split conductor model (8) is connected to or not connected to the ice-covered model (7). An automatic telescopic mechanism is movably connected to the upper end plate (6) to drive the upper end plate (6) to move relative to the lower end plate (9) to adjust the tilt angle of the multi-split wire model (8) with the horizontal plane. The automatic telescopic machine can rotate relative to the wind tunnel (1) around the second rotation center, which is parallel to or coincides with the first rotation center.

2. The wind tunnel experimental apparatus for measuring the force of transmission lines under oblique wind conditions as described in claim 1, characterized in that: It also includes a rotating base (4) and a connecting rod (5). The rotating base (4) is rotatably connected to the wind tunnel (1) and can rotate relative to the wind tunnel (1) around the first rotation center. The lower end plate (9) is fixedly connected to the rotating base (4). The connecting rod (5) is rotatably connected to the wind tunnel (1). The connecting rod (5) can rotate relative to the wind tunnel (1) around the second rotation center. The upper end of the automatic telescopic machine is movably connected to the connecting rod (5), and the lower end of the automatic telescopic machine is movably connected to the upper end plate (6).

3. The wind tunnel experimental apparatus for measuring the force of transmission lines under oblique wind conditions as described in claim 2, characterized in that: The automatic telescopic machine is connected to the center position of the upper end plate (6), and the rotating base (4) is connected to the center position of the lower end plate (9).

4. The wind tunnel experimental apparatus for measuring the force of transmission lines under oblique wind conditions as described in claim 2 or 3, characterized in that: The central axis of the rotating base (4) coincides with the first rotation center, and the central axis of the connecting rod (5) coincides with the second rotation center.

5. The wind tunnel experimental apparatus for measuring the force of transmission lines under oblique wind conditions as described in claim 2, characterized in that: The rotating base (4) passes through the lower wall of the wind tunnel (1) and connects to the motor outside the wind tunnel (1); the connecting rod (5) passes through the upper wall of the wind tunnel (1) and is fixed to the upper turntable outside the wind tunnel (1).

6. The wind tunnel experimental apparatus for measuring the force of transmission lines under oblique wind conditions as described in claim 2, characterized in that: The lower end of the automatic telescopic machine is rotatably connected to the upper end plate (6) via a shaft, and the upper end of the automatic telescopic machine is rotatably connected to the connecting rod (5) via a shaft.

7. The wind tunnel experimental apparatus for measuring the force on a power transmission line under oblique wind conditions according to any one of claims 1-3, 5, and 6, characterized in that: The upper and lower ends of the multi-split conductor model (8) are rotatably connected to the upper end plate (6) and the lower end plate (9) respectively via shafts.

8. The wind tunnel experimental apparatus for measuring the force on a power transmission line under oblique wind conditions according to any one of claims 1-3, 5, and 6, characterized in that: Balances (3) are fixedly installed on the upper end plate (6) and the lower end plate (9), respectively. The two balances (3) correspond to the upper and lower parts of the same multi-split conductor model (8).

9. The wind tunnel experimental apparatus for measuring the force on a power transmission line under oblique wind conditions according to any one of claims 1-3, 5, and 6, characterized in that: The automatic telescopic mechanism is any one of a hydraulic rod (2), an electric telescopic rod, or a cylinder.

10. A wind tunnel experimental method for measuring the force on transmission lines under oblique wind conditions, characterized in that: The wind tunnel testing apparatus as described in any one of claims 1-9 is used, and the wind tunnel testing method includes the following steps: The multi-split conductor model (8) undergoes slight deformation under the action of wind, which in turn pulls the upper end plate (6) and the lower end plate (9) to undergo slight deformation. The small deformation of the end plates can be obtained through the balance (3) at both ends. Finally, the aerodynamic parameters of the conductor model are measured and transmitted through the balance (3).

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