CN210104664U - Device for measuring air displacement of water tongue outer edge overhanging distance of low-pressure environment model - Google Patents
Device for measuring air displacement of water tongue outer edge overhanging distance of low-pressure environment model Download PDFInfo
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- CN210104664U CN210104664U CN201920455602.4U CN201920455602U CN210104664U CN 210104664 U CN210104664 U CN 210104664U CN 201920455602 U CN201920455602 U CN 201920455602U CN 210104664 U CN210104664 U CN 210104664U
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Abstract
The utility model discloses a survey low pressure environment model water tongue outer fringe is chosen apart from device of aerial shift volume, including the decompression case be equipped with outlet, extraction opening and tonifying qi mouth on the decompression case be equipped with the trial distance roof beam in the decompression case, the trial distance roof beam spanes in model water tongue the place ahead, the lower border line of trial distance roof beam is adjacent with the outer border line of model water tongue, the trial distance roof beam with the lateral wall of decompression case adopts releasable connection structure to connect the camera is installed at the top of decompression case, the camera is used for shooting and is located model water tongue flow state in trial distance roof beam skew the place ahead, the camera with be located the outer computer of decompression case is connected. The utility model discloses a horizontal adjustment tries to find the position of distance roof beam and surveys the model nappe outer fringe and choose apart from aerial shift volume under the low pressure environment, and the principle is simple and clear, and the phenomenon is directly perceived, low cost.
Description
Technical Field
The utility model belongs to the technical field of dam engineering hydraulics is experimental, especially a survey low pressure environment model nappe outer fringe is chosen device of distance air shift volume.
Background
The southeast area of Tibetan China is an important energy base for future hydroelectric development. In the plateau high dam flood discharge safety research, the movement track of the discharge flow water tongue is basic data for judging whether the water tongue can be effectively returned to a groove, carrying out atomization prediction calculation and developing energy dissipation and scour prevention design. Therefore, how the movement track of the drainage nappe is influenced by low air pressure and whether the influence magnitude is enveloped in the existing design safety factor range need to be researched. At present, numerical simulation results indicate that the picking distance of the prototype water discharge tongue increases by about 1-2% when the environmental air pressure is reduced by 10 kPa, but the effective experimental data is lacked.
At present, a pressure reducing box is an effective test device for simulating environmental air pressure variables, when the motion trail of a model discharge nappe is measured in the pressure reducing box, if maximum pressure point fitting when the nappe impacts a water cushion is adopted, a sensor needs to be arranged in a preset nappe impact area, and the arrangement method of the sensor comprises two methods, namely arranging the sensor on a test vehicle, and pre-embedding the sensor below the nappe impact area. Adopt test car installation sensor, sensor position is adjustable, but the instrument line need be followed car down the advection and drawn forth, and the test car still can cause the problem of water cushion district streaming simultaneously, influences the measuring accuracy. The sensor is arranged in an embedded mode, and the position of the sensor cannot be adjusted.
The maximum pressure fitting span value when the nappe impacts the water cushion comprises an air span and an underwater span, so that the influence of low air pressure on the air span of the model nappe is difficult to effectively measure. In view of the limited observable degree of the decompression box, in order to effectively determine the influence degree of the low air pressure on the air span of the model nappe, a device for measuring the air shift amount of the outer edge span of the model nappe in the low air pressure environment needs to be designed.
Disclosure of Invention
The utility model provides a device for measuring the displacement in the air of the water tongue outer edge of the low-pressure environment model for solving the technical problems in the prior art.
The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: the utility model provides a survey low pressure environment model water tongue outer fringe is chosen apart from device of aerial displacement volume, includes the decompression case be equipped with outlet, extraction opening and tonifying qi mouth on the decompression case be equipped with the examination apart from the roof beam in the decompression case, the examination is strideed apart from the roof beam and is in model water tongue the place ahead, the lower borderline of examination apart from the roof beam is adjacent with the outer borderline of model water tongue, the examination apart from the roof beam with the lateral wall of decompression case adopts releasable connection structure to connect the camera is installed at the top of decompression case, the camera is used for shooting and is located the oblique the place ahead of examination apart from the roof beam model water tongue flow state, the camera with be located the outer computer of decompression case is connected.
And electromagnetic chucks connected with the side walls of the decompression boxes are arranged at the two ends of the distance-measuring beam.
The utility model has the advantages and positive effects that: the air displacement of the outer edge of the water tongue of the low-pressure environment model is measured by horizontally adjusting the position of the trial distance beam, the principle is simple and clear, the phenomenon is visual, and the cost is low.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is the schematic structural diagram of the connection between the trial distance beam and the side wall of the decompression box.
In the figure: 1. a pressure reducing tank; 2. a water discharge opening; 3. model nappa; 4. an air extraction opening; 5. an air supplement port; 6. a water outlet; 7. A trial distance beam; 8. a camera; 9. an electromagnetic chuck.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are exemplified and will be described in detail with reference to the accompanying drawings:
please refer to fig. 1 and 2, a device for measuring the displacement of the outer edge of the model nappe in the air in the low-pressure environment, comprising a pressure reducing box 1, wherein the pressure reducing box 1 is provided with a water outlet 2, a water outlet 6, an air exhaust port 4 and an air supplement port 5, and is characterized in that a trial distance beam 7 is arranged in the pressure reducing box 1, the trial distance beam 7 spans in front of the model nappe 3, the lower edge line of the trial distance beam 7 is adjacent to the outer edge line of the model nappe 3, the trial distance beam 7 is connected with the side wall of the pressure reducing box 1 by a detachable connection structure, a camera 8 is arranged at the top of the pressure reducing box 1, the camera 8 is used for shooting the flow state of the model nappe 3 in the oblique front of the trial distance beam 7, the camera is connected with a computer outside the pressure reducing box 1, and the computer is used for displaying and storing image data shot by the.
In this embodiment, for the convenience of disassembly, the two ends of the distance-measuring beam 7 are both provided with electromagnetic chucks 9 connected with the side walls of the decompression box 1.
The method comprises the following steps of supplying water to a water outlet 2 under the normal pressure of ① to form a model water tongue 3 with stable flow rate, enabling a tester to enter a decompression box 1 to observe the outer edge track of the model water tongue 3, setting a measurement area and marking, stopping supplying water, installing a test beam 7 and a camera 8 at the measurement area to enable the lower edge line of the test beam 7 to be adjacent to the outer edge line of the model water tongue 3, installing the camera 8 at the top of the decompression box 1 to enable the camera 8 to record the flow state of the model water tongue 3 in the oblique front of the test beam 7, supplying water to the water outlet 2 to form the model water tongue 3 with stable flow rate, draining water through a water outlet 6 to ensure that the water level in the decompression box 1 is kept unchanged, verifying the installation position according to the image of the camera 8, vacuumizing ④ through an air extracting opening 4 to enable the environment in the decompression box 1 to reach a designed vacuum degree, adjusting the water supply amount of the water outlet 2 to ensure that the flow rate of the model water tongue 3 is kept unchanged, adjusting the water level of a water level 6 to ensure that the water level in the water outlet 1 is kept, and the air pressure of the model water tank 1, and the horizontal displacement of the test water splashing phenomenon of the model water tongue 3 is kept when the model water tank 3 is detected, and the air pressure of the model water tank 3, and the model water splashing phenomenon is detected, and the displacement of the model water tank 3 is detected, and the model water leakage phenomenon is detected, and the displacement of the model water leakage is recorded if the displacement of the model water leakage is recorded, and the model water leakage is recorded, if the model water leakage is changed, the displacement of the model water tank 3, the model water leakage is recorded, the displacement of the model water tank 3, if the model water.
By changing the position of the measuring area, the track line of the outer edge offset of the low-pressure environment model nappe 3 can be obtained. When the structure of the water outlet 2 and the water supply amount are kept unchanged, the influence of different low-pressure environments on the displacement amount of the outer edge offset air of the model nappe 3 under the same inflow condition can be obtained by adjusting the vacuum degree of the decompression box 1. The vacuum degree of the decompression box 1 is kept constant, and the influence of different incoming flow conditions on the displacement amount in the air of the outer edge offset of the model nappe 3 under the constant low-pressure environment can be obtained by changing the structure and the water supply amount of the water outlet 2.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the scope of the present invention.
Claims (2)
1. The utility model provides a survey low pressure environment model nappe outer fringe is chosen apart from device of aerial displacement volume, includes the decompression case be equipped with outlet, extraction opening and tonifying qi mouth on the decompression case, its characterized in that be equipped with the trial distance roof beam in the decompression case, the trial distance roof beam spanes in model nappe the place ahead, the lower border line of trial distance roof beam is adjacent with the outer border line of model nappe, the trial distance roof beam with the lateral wall of decompression case adopts releasable connection structure to connect the camera is installed at the top of decompression case, the camera is used for shooting and is located model nappe flow state in the oblique place ahead of trial distance roof beam, the camera with be located the outer computer of decompression case is connected.
2. The device for measuring the air displacement of the overhanging distance of the outer edge of the nappe of the low-pressure environment model as claimed in claim 1, wherein the electromagnetic chucks connected with the side walls of the decompression box are arranged at both ends of the pitch beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920455602.4U CN210104664U (en) | 2019-04-04 | 2019-04-04 | Device for measuring air displacement of water tongue outer edge overhanging distance of low-pressure environment model |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920455602.4U CN210104664U (en) | 2019-04-04 | 2019-04-04 | Device for measuring air displacement of water tongue outer edge overhanging distance of low-pressure environment model |
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| CN210104664U true CN210104664U (en) | 2020-02-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155860A (en) * | 2020-12-17 | 2021-07-23 | 华能澜沧江水电股份有限公司 | Flow state video monitoring-based method and system for diagnosing structural damage of water-passing building |
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2019
- 2019-04-04 CN CN201920455602.4U patent/CN210104664U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155860A (en) * | 2020-12-17 | 2021-07-23 | 华能澜沧江水电股份有限公司 | Flow state video monitoring-based method and system for diagnosing structural damage of water-passing building |
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