CN110567671B - Wind tunnel for researching aerodynamic characteristics of power line tower - Google Patents
Wind tunnel for researching aerodynamic characteristics of power line tower Download PDFInfo
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- CN110567671B CN110567671B CN201910971263.XA CN201910971263A CN110567671B CN 110567671 B CN110567671 B CN 110567671B CN 201910971263 A CN201910971263 A CN 201910971263A CN 110567671 B CN110567671 B CN 110567671B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a wind tunnel for researching the aerodynamic characteristics of a power transmission line tower, which belongs to the technical field of wind tunnels and comprises a tunnel body, wherein a temperature control device, a snow falling device, a simulation power transmission line and a simulation power transmission line tower for supporting the simulation power transmission line are arranged in the tunnel body, the temperature control device is used for controlling the temperature in the tunnel body, the snow falling device is fixedly arranged at the top of the tunnel body and is used for carrying out snow falling on the simulation power transmission line and the simulation power transmission line tower, on the same cross section of the simulation power transmission line, a shell comprises a heating section and a hydrophobic section positioned on the lower side of the heating section, a plurality of hydrophobic holes are formed in the hydrophobic section, and the heating section is connected to the heating control device. The device disclosed by the invention can be used for the follow-up pneumatic characteristic research of the ice-coated wire by simulating the generation of the ice cones on the transmission line and carrying out test on the ice cones, so that the test efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of wind tunnels, and particularly relates to a wind tunnel for researching the aerodynamic characteristics of a power line tower.
Background
The transmission line tower mainly bears loads such as wind load, ice load, line tension, constant load, personnel and tool weight during installation or maintenance, broken lines, earthquake action and the like. The reasonable combination of the loads under different meteorological conditions is considered during design, and the constant loads comprise the weight of a tower, a line, hardware fittings and an insulator, the angle resultant force of the line, the unbalanced tension of a following line and the like. The number of wire breakage loads (generally, simultaneous wire breakage and lightning conductor breakage is not considered), the magnitude of the wire breakage tension, the weather conditions at the time of wire breakage, and the like are different from country to country.
In a high-voltage power transmission tower system, a power transmission tower has the characteristics of high flexibility, small damping and the like, the power transmission tower is highly compact in arrangement, and the power transmission tower is easy to generate coupling vibration with the power transmission tower due to large span, multiple splitting and small phase distance. The characteristics of high flexibility, geometric nonlinearity, high compactness of lead arrangement and the like of the extra-high voltage compact transmission line-tower structure enable the extra-high voltage compact transmission line-tower structure to easily induce unstable vibration and even windage yaw flashover under specific microclimate and microtopography conditions, and restrict the popularization and application of high-voltage transmission technology to a certain extent. The power characteristics of the high-voltage transmission line structure under the action of wind load are very complex, and wind vibration response, particularly wind-induced damage of a system, easily causes frequent occurrence of wind-induced damage accidents of the transmission line, and causes economic loss for power grid operation. In order to reduce wind-induced damage accidents of a power transmission line, a wind-induced damage mechanism is simulated and analyzed by constructing a gas bomb model of a power transmission line tower in the prior art. However, the existing model construction method only takes the total terrain and meteorological environment of the area where the power transmission network is located as the input of environmental parameters, no relevant experimental device is available for simulation research, field measurement is time-consuming and labor-consuming, a relevant factor cannot be adjusted in real time, and the test efficiency is low.
Disclosure of Invention
In view of this, the present application mainly provides a wind tunnel for researching the aerodynamic characteristics of a power transmission line tower, and the wind tunnel can be used for the subsequent research on the aerodynamic characteristics of an ice-coated wire by simulating the generation of ice cones on the power transmission line and performing test tests on the ice cones, so that the test efficiency is greatly improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a wind tunnel for researching the aerodynamic characteristics of a power transmission line tower comprises a tunnel body, wherein a temperature control device, a snow falling device, a simulation power transmission line and a simulation power transmission line tower for supporting the simulation power transmission line are arranged in the tunnel body, the temperature control device is used for controlling the temperature in the tunnel body, the snow falling device is fixedly arranged at the top of the tunnel body and used for falling snow above the simulation power transmission line and the simulation power transmission line tower, the number of the simulation power transmission line towers is at least two, the simulation power transmission line towers are sequentially arranged along the axial direction of the tunnel body, the simulation power transmission line continuously stretches across the simulation power transmission line tower, the simulation power transmission line comprises a core and a shell arranged outside the core, the shell comprises a heating section and a hydrophobic section positioned on the lower side of the heating section on the same cross section of the simulation power transmission line, and a plurality of hydrophobic holes are formed in the hydrophobic section, the heating section is connected to a heating control device.
Further, the heating section includes skin, inlayer and heater strip, the heater strip is located the hollow ring cavity that forms between skin and the inlayer, the heater strip is followed simulation transmission line's axial has arranged a plurality of groups.
Furthermore, the radian range of the heating section in the shell is 1/3-1/2, and the radian range of the hydrophobic section in the shell is 1/3-1/2.
Further, the shell is arranged on the outer side of the core body at intervals, and a plurality of connecting ribs are arranged between the shell and the core body.
Further, simulation transmission line tower includes the tower body, the bottom of the body in a cave is provided with a supporting bench, the upper surface of supporting bench is provided with the spout along the axial of the body in a cave, the bottom of tower body be provided with spout complex mount pad, the tower body with can follow the body endwise slip mode in a cave with a supporting bench sliding connection.
Furthermore, an analog insulator is arranged on the analog power transmission line tower, the analog power transmission line is connected with the analog power transmission line tower through the analog insulator, and a pre-tensioning device used for buckling the analog power transmission line is arranged on the analog insulator.
Further, a first support and a second support for supporting the simulation power transmission line are arranged at the bottom of the simulation insulator, through holes are formed in the first support and the second support, the pre-tensioning device comprises a pull buckle which is arranged between the first support and the second support and used for pre-tensioning the simulation power transmission line upwards, the top of the pull buckle is fixedly connected with the simulation insulator through a spring, and a channel for installing the spring is arranged at the bottom of the simulation insulator.
Furthermore, the outer surface of the pull buckle is provided with a limiting bulge.
Further, the tower body is formed by combining a plurality of hollow pipes, an antifreeze filling opening is formed in the upper portion of each hollow pipe, and an antifreeze outlet is formed in the lower portion of each hollow pipe.
Further, the tower body comprises a hollow transverse pipe, a water filling port is formed in one end of the transverse pipe, and a plurality of water leaking ports are formed in the side face of the transverse pipe.
The invention has the beneficial effects that: the wind tunnel comprises a tunnel body, wherein a temperature control device, a snow falling device, a simulation power transmission line and a simulation power transmission line tower are arranged in the tunnel body, the temperature control device is used for controlling the temperature in the tunnel body, the snow falling device is fixedly arranged at the top of the tunnel body and is used for falling snow above the simulation power transmission line and the simulation power transmission line tower, after accumulated snow on the simulation power transmission line is accumulated to a certain extent, a heating section is controlled by the heating control device to heat the simulation power transmission line, so that the snow accumulated above the simulation power transmission line is melted, the heating control device is turned off in a delayed time in the melting process, and the temperature control device in the tunnel body is controlled in a delayed time, so that water drops on the simulation power transmission line can be slowly solidified into an ice cone, the process is repeated, the ice cone can be gradually increased, and conditions are created for the follow-up research on the pneumatic characteristic, and the influence of ice cones with different sizes on the test result can be researched, and the test efficiency is improved.
The invention can also carry out an icing jump simulation experiment at the same time, and the icing jump simulation experiment can be carried out by actually measuring the sag of the power transmission line before and after icing under various working conditions under the icing condition of the power transmission line in the subsequent simulation experiment because the sag of the wire is increased and the icing jump value is increased along with the increasing icing thickness on the power transmission line under the control of the temperature control device and the snowfall device when the icing thickness exceeds 10 mm.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the connection of the simulated transmission line of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a schematic cross-sectional view of a simulated transmission line of the present invention;
fig. 5 is a schematic structural diagram of the simulation insulator of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a schematic connection diagram of an analog transmission line of the present invention, fig. 3 is a front view of the present invention, fig. 4 is a schematic cross-sectional diagram of an analog transmission line of the present invention, and fig. 5 is a schematic structural diagram of an analog insulator of the present invention. The invention discloses a wind tunnel for researching the aerodynamic characteristics of a power transmission line tower, which comprises a tunnel body 1, wherein a temperature control device 2, a snow falling device 3, a simulation power transmission line 4 and a simulation power transmission line tower 5 for supporting the simulation power transmission line 4 are arranged in the tunnel body 1, the temperature control device 2 is used for controlling the temperature in the tunnel body 1, the snow falling device 3 is fixedly arranged at the top of the tunnel body 1 and is used for carrying out snow falling on the simulation power transmission line 4 and the simulation power transmission line tower 5, at least two simulation power transmission line towers 5 are arranged, the simulation power transmission line towers 5 are sequentially arranged along the axial direction of the tunnel body 1, the simulation power transmission line 4 continuously crosses the simulation power transmission line tower 5, the simulation power transmission line 4 comprises a core body 41 and a shell body 42 arranged on the outer side of the core body 41, on the same cross section of the simulation power transmission line 4, the shell body 42 comprises a heating section 421 and a hydrophobic section 422 positioned on the lower, the hydrophobic section 422 is provided with a plurality of hydrophobic holes 43, and the heating section 421 is connected to the heating control device.
In this embodiment, the heating section 421 includes an outer layer 4211, an inner layer 4212 and heating wires 4213, the heating wires 4213 are located in a hollow circular cavity formed between the outer layer 4211 and the inner layer 4212, and the heating wires 4213 are arranged in several groups along the axial direction of the analog power transmission line 4.
In the wind tunnel, a temperature control device 2, a snow falling device 3, a simulation power transmission line 4 and a simulation power transmission line tower 5 are arranged in a tunnel body 1, the temperature control device 2 is used for controlling the temperature in the tunnel body 1, the snow falling device 3 is fixedly arranged at the top of the tunnel body 1 and is used for falling snow above the simulation power transmission line 4 and the simulation power transmission line tower 5, after a certain accumulated snow is accumulated on the simulation power transmission line 4, the simulation power transmission line 4 is heated by a heating control section 421 controlled by the heating control device 2, so that the accumulated snow above the simulation power transmission line 4 is melted, the heating control device is turned off in a delayed manner in the melting process, the temperature control device 2 in the tunnel body 1 is controlled in a delayed manner, so that water drops on the simulation power transmission line 4 can be slowly solidified into an ice cone, and the ice cone can be gradually increased by repeating the above processes, the method creates conditions for the follow-up research of the aerodynamic characteristics of the ice-coated wire until the test conditions are met, can research the influence of ice cones with different sizes on the test result, and improves the test efficiency.
According to the device, the heating section 421 is heated rapidly instantly, so that the ice cones can fall off directly after being accumulated to a certain degree, the situation of conductor deicing under various working conditions is simulated by a method of instantly releasing the ice cones through related measurement of subsequent tests, physical quantities such as conductor jumping amplitude and conductor tension change are measured actually, the device can also simulate an ice coating jumping test of a power transmission line, and the experiment cost is reduced.
In this embodiment, the radian range of the heating section 421 occupied in the casing 42 is 1/3-1/2, and the radian range of the hydrophobic section 422 occupied in the casing 42 is 1/3-1/2. By arranging the heating section 421 reasonably, the ice making process can be faster, and the ice cone can be kept more stable.
In this embodiment, the shell 42 is disposed at an interval outside the core, and the plurality of connecting ribs 44 are disposed between the shell 42 and the core 41, so that the shell 42 and the core 41 can be connected more firmly, and a simulation of the power transmission line can be performed more truly.
In this embodiment, simulation power line tower 5 includes tower body 501, the bottom of the body of cave 1 is provided with a supporting bench 6, the upper surface of supporting bench 6 is provided with spout 7 along the axial of the body of cave 1, the bottom of tower body 501 be provided with spout 7 complex mount pad 8, tower body 501 with can follow the body of cave 1 endwise slip the mode with supporting bench 6 sliding connection. Through with tower body 501 slidable connection, can adjust the distance between two adjacent simulation electric power towers 5 to can carry out a simulation between the different distance electric power towers, practice thrift the cost.
In this embodiment, the simulation power transmission line tower 5 is provided with the simulation insulator 9, the simulation power transmission line 4 is connected with the simulation power transmission line tower 5 through the simulation insulator 9, the simulation insulator 9 is provided with a pre-tensioning device for buckling the simulation power transmission line 4, the simulation power transmission line 4 is pre-tensioned through the pre-tensioning device, when the distance between two adjacent simulation power transmission line towers 5 is adjusted, the simulation insulator 9 can be quickly buckled on the simulation power transmission line 4, the looseness of the simulation power transmission line 4 is prevented, and the adjustment time is saved.
In this embodiment, the bottom of the analog insulator 9 is provided with a first support and a second support 11 10 and a second support 11 for supporting the analog power transmission line 4, the first support 10 and the second support 11 are provided with through holes, the pre-tensioning device includes a pull buckle 12 arranged between the first support 10 and the second support 11 and used for pre-tensioning the analog power transmission line 4 upwards, the top of the pull buckle 12 is fixedly connected with the analog insulator 9 through a spring 13, and the bottom of the analog insulator 9 is provided with a channel 14 for installing the spring 13.
In this embodiment, the outer surface of the pull buckle 12 is provided with the limiting protrusion 15, so that a limiting effect is achieved, the pull buckle 12 is prevented from entering the channel 14, and the support for the analog transmission line 4 is more convenient.
In this embodiment, the tower body 501 is formed by combining a plurality of hollow pipes, an antifreeze filling port 16 is arranged at the upper part of each hollow pipe, an antifreeze outlet 17 is arranged at the lower part of each hollow pipe, and by arranging the hollow pipes, antifreeze can be added, which is equivalent to increasing the balance weight of the tower body 501, so that the influence of the tower bodies 501 with different weights on an ice-coated wire experiment can be simulated.
In this embodiment, the tower body 501 includes a hollow horizontal tube 18, one end of the horizontal tube 18 is provided with a water filling port 19, the lateral surface of the horizontal tube 18 is provided with a plurality of water leaking ports, and water is filled into the horizontal tube 18, so that water is continuously leaked from the water leaking ports, and therefore a certain amount of ice cones can be generated on the horizontal tube 18, and the simulation process is more accurate.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A wind tunnel for studying aerodynamic characteristics of a power line tower comprises a tunnel body and is characterized in that: a temperature control device, a snowing device, a simulation power transmission line and a simulation power transmission line tower for supporting the simulation power transmission line are arranged in the hole body, the temperature control device is used for controlling the temperature in the hole body, the snow falling device is fixedly arranged at the top of the hole body and used for falling snow above the simulation power transmission line and the simulation power transmission line tower, at least two simulation power towers are arranged, the simulation power towers are sequentially arranged along the axial direction of the hole body, the analog transmission line continuously crosses the analog transmission line tower, the analog transmission line comprises a core body and a shell body arranged on the outer side of the core body, on the same section of the analog transmission line, the shell comprises a heating section and a hydrophobic section positioned on the lower side of the heating section, the hydrophobic section is provided with a plurality of hydrophobic holes, and the heating section is connected to the heating control device; the heating section comprises an outer layer, an inner layer and heating wires, the heating wires are located in a hollow circular cavity formed between the outer layer and the inner layer, and a plurality of groups are arranged along the axial direction of the simulation power transmission line.
2. A wind tunnel for studying aerodynamic characteristics of a pylon according to claim 1, characterized in that: the radian range of the heating section in the shell is 1/3-1/2, and the radian range of the hydrophobic section in the shell is 1/3-1/2.
3. A wind tunnel according to claim 2 for studying the aerodynamic characteristics of a pylon, characterized in that: the shell is arranged on the outer side of the core at intervals, and a plurality of connecting ribs are arranged between the shell and the core.
4. A wind tunnel for studying aerodynamic characteristics of a pylon according to claim 1, characterized in that: the simulation power line tower includes the tower body, the bottom of the body in a hole is provided with a supporting bench, the upper surface of supporting bench is provided with the spout along the axial of the body in a hole, the bottom of tower body be provided with spout complex mount pad, the tower body with can follow the body endwise slip's of a hole mode with a supporting bench sliding connection.
5. A wind tunnel according to claim 4 for studying the aerodynamic characteristics of a pylon, characterized in that: the simulation power transmission line tower is characterized in that a simulation insulator is arranged on the simulation power transmission line tower, the simulation power transmission line is connected with the simulation power transmission line tower through the simulation insulator, and a pre-tensioning device used for buckling the simulation power transmission line is arranged on the simulation insulator.
6. A wind tunnel according to claim 5 for studying the aerodynamic characteristics of a pylon, characterized in that: the device comprises a simulation power transmission line and is characterized in that a first support and a second support for supporting the simulation power transmission line are arranged at the bottom of the simulation insulator, through holes are formed in the first support and the second support, the pre-tensioning device comprises a pull buckle which is arranged between the first support and the second support and used for pre-tensioning the simulation power transmission line upwards, the top of the pull buckle is fixedly connected with the simulation insulator through a spring, and a channel for installing the spring is formed in the bottom of the simulation insulator.
7. A wind tunnel according to claim 6 for studying the aerodynamic characteristics of a pylon, characterized in that: the outer surface of the pull buckle is provided with a limiting bulge.
8. A wind tunnel according to claim 4 for studying the aerodynamic characteristics of a pylon, characterized in that: the tower body is formed by combining a plurality of hollow pipes, an antifreeze filling opening is formed in the upper portion of each hollow pipe, and an antifreeze outlet is formed in the lower portion of each hollow pipe.
9. A wind tunnel for studying aerodynamic characteristics of a pylon according to claim 8, wherein: the tower body comprises a hollow transverse pipe, a water filling port is formed in one end of the transverse pipe, and a plurality of water leaking ports are formed in the side face of the transverse pipe.
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| CN112903234B (en) * | 2021-01-11 | 2023-10-20 | 宁波市电力设计院有限公司 | Wind load test device of local pole system of transmission tower structure |
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