CN110375953B - Vortex-induced vibration wake venting test device and test method based on optical refraction - Google Patents
Vortex-induced vibration wake venting test device and test method based on optical refraction Download PDFInfo
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- CN110375953B CN110375953B CN201910615926.4A CN201910615926A CN110375953B CN 110375953 B CN110375953 B CN 110375953B CN 201910615926 A CN201910615926 A CN 201910615926A CN 110375953 B CN110375953 B CN 110375953B
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Abstract
本发明涉及涡激振动时尾流泄放的显示试验技术，尤其是涉及基于光学折射的涡激振动尾流泄放试验装置及试验方法。一种基于光学折射的涡激振动尾流泄放试验装置，包括直线光源和设置有循环水的水槽，所述的水槽内上下滑动连接有显示屏，所述的水槽的底部设置有底座，所述的底座上固定有贯穿显示屏的玻璃管，所述的水槽的侧壁上设置有摄像机。本发明不会污染水体，而且能够准确反映涡激振动尾流泄放情况。
The invention relates to a display test technology for wake discharge during vortex-induced vibration, in particular to a vortex-induced vibration wake discharge test device and a test method based on optical refraction. A vortex-induced vibration wake discharge test device based on optical refraction, comprising a linear light source and a water tank provided with circulating water, a display screen is slidably connected in the water tank, and a base is arranged at the bottom of the water tank, so the A glass tube penetrating the display screen is fixed on the base, and a camera is arranged on the side wall of the water tank. The invention does not pollute the water body, and can accurately reflect the vortex-induced vibration wake discharge situation.
Description
Technical Field
The invention relates to a display test technology of wake flow release during vortex-induced vibration, in particular to a vortex-induced vibration wake flow release test device and a test method based on optical refraction.
Background
In the engineering field, the vortex-induced vibration phenomenon brings about a lot of problems, and research work on the vortex-induced vibration phenomenon is also very extensive. Under the action of fluid such as air and water with a certain flow velocity, the tail of an object can generate alternate vortex, so that pulsating pressure difference is formed on two sides of the object, and structural vibration is caused, such as a high-voltage cable, a bridge, a television tower, a marine riser and the like. The marine riser is an important component of the marine platform and is used for transmitting oil gas at the seabed, the vortex-induced vibration of the marine riser can cause the fatigue damage of the structure, the vortex-induced vibration of the marine floating platform influences the working comfort of platform personnel, and also influences the fatigue damage of other auxiliary structures such as anchor chains and the like.
At present, the research on vortex-induced vibration mainly focuses on the field of research on hydrodynamic characteristics of marine risers and floating structures. The research method of vortex-induced vibration is mainly a model test, and researchers also use a traditional wake flow vibrator model and a CFD method for numerical simulation research.
In the test research, the wake flow state of vortex discharge is usually researched, in order to accurately distinguish the discharge mode of the wake flow, a tracing method is usually adopted for display test, and the current common method adopts a tracing reagent, such as a hole is formed in the outer wall of a vibration structure, the tracing reagent is ejected along with the wake flow in the vibration structure, or bubbles and metal particles are adopted for tracing, the method can reflect the wake flow discharge condition to a certain extent, but practice shows that the effect is not ideal, and the representation of the vortex is not obvious.
The display test that adopts the tracer method to carry out wake vortex and release because adopt the tracer, can pollute the water to a certain extent, especially when adopting the circulating water to test, the water can be polluted by the tracer gradually, leads to the tracer of wake to show more and more vaguely. In foreign countries, a bubble method or metal particles are adopted for tracing, but the tracing precision is closely related to the size and random trend of bubbles or metal particles, and is related to the ambient light effect, so that the display effect of wake vortex leakage is difficult to guarantee.
Disclosure of Invention
The invention mainly aims to solve the problems that in the prior art, when a tracer method is adopted for carrying out a display test of wake vortex discharge, water bodies are polluted and the vortex-induced vibration wake discharge condition cannot be accurately reflected, and provides a vortex-induced vibration wake discharge test device and a test method based on optical refraction, which can not pollute the water bodies and can accurately reflect the vortex-induced vibration wake discharge condition.
The purpose of the invention is mainly realized by the following scheme: the utility model provides a vortex induced vibration wake flow test device that releases based on optical refraction, includes linear light source and the basin that is provided with the circulating water, the basin in sliding connection have the display screen from top to bottom, the bottom of basin be provided with the base, the base on be fixed with the glass pipe that runs through the display screen, the lateral wall of basin on be provided with the camera. The water tank is internally provided with a circulating water flow, the water tank is internally connected with a display screen in an up-and-down sliding manner, the display screen can slide up and down in the water tank, the bottom of the water tank is provided with a base, a glass tube penetrating through the display screen is fixed on the base, the side wall of the water tank is provided with a camera, the water flow in the tank generates vortex wake flow at the position close to the water surface after flowing through the glass tube, a linear light source is obliquely incident to the water surface of a wake flow area, light is reflected and then displayed on the display screen, according to the actual situation, the image on the display screen can be adjusted by adjusting the position of the display screen in the water tank, the images at all position heights can be compared and analyzed by adjusting the position height of the display screen, the camera records the image information displayed on the display screen, so that the image information is called to carry out post-processing analysis after the test is finished, and clear vortex oscillation, the existing tracer wake vortex leakage display method has certain influence on the local flow field because the tracer outlet is equivalent to a fluid supplement source, and the bubble method or the metal particle method has certain influence on the property of the fluid, so that essentially, the existing method has certain influence on the flow field, and the method adopts optical refraction imaging, does not cause interference on the flow field, does not change the property of the fluid, and can truly reflect the flow field wake flow information of the fluid to be researched.
Preferably, the inner side wall of the water tank is provided with a slide rail, and the display screen is provided with a slide block connected with the slide rail in a sliding manner. Be provided with the slide rail on the inside wall of basin, the vertical setting of slide rail is on the basin inside wall, be provided with on the display screen with slide rail sliding connection's slider, can adjust the height of display screen in the basin through the slip of slider on the slide rail, the convenience is high.
Preferably, the sliding blocks are arranged on two sides of the display screen close to the side wall of the water tank, and two sliding blocks are arranged on each side face. The slider sets up on the both sides that are close to the basin lateral wall of display screen, and each side all sets up two sliders for stability when adjusting the display screen height is good.
Preferably, the glass tube is connected with the display screen through a protection piece made of elastic material, an annular groove used for being clamped with the display screen is formed in the outer wall of the protection piece along the circumferential direction, and a connecting hole used for being connected with the glass tube is formed in the center of the protection piece. The glass tube is connected with the display screen through the protection piece made of elastic materials, the annular groove used for being clamped with the display screen is formed in the outer wall of the protection piece in the circumferential direction, the connecting hole used for being connected with the glass tube is formed in the center of the protection piece, the glass tube for testing is brittle and is easy to break when being subjected to external force, particularly when the height of the display screen is adjusted, the protection piece has elasticity, the glass tube can be well buffered and protected, and the glass tube can be prevented from breaking when being subjected to the external force when the display screen moves.
Preferably, the protective part is provided with an air bag layer around the glass tube. Be provided with the gasbag layer around the glass pipe on the protection piece, can make the glass pipe produce when the rivers impact that the basin inner loop flows on the glass pipe and rock because the setting on gasbag layer can offset rocking of glass pipe better for the glass pipe can remain stable, has improved the accurate nature of test result.
Preferably, the guard is made of a rubber material. The protection part is made of rubber materials, so that the elasticity is good, the cost is low, and the service life is long.
A test method of the vortex-induced vibration wake flow release test device based on optical refraction is carried out according to the following steps:
fixing a glass tube, namely fixing the glass tube at the bottom of a water tank through a base;
step two, filling water into the water tank until the liquid level reaches the height required by the test, and opening circulating water to make flow;
step three, the linear light source is incident, the linear light source is turned on, light rays are made to obliquely enter the water surface, and the imaging condition of the refracted light rays on the display screen is observed;
adjusting the position of the display screen, and adjusting the position of the display screen by changing the height of the sliding block on the sliding rail to obtain an ideal wake vortex characteristic image;
fifthly, the camera works, the camera is turned on, the change situation of wake vortex characteristics on the display screen is recorded, and the camera is turned off after the recording is finished;
step six, changing the flow velocity of the circulating water tank to obtain a changed vortex street with vortex-induced vibration wake discharge, and repeating the steps 4-5;
and step seven, after the test is finished, closing the circulating water in the water tank, closing the linear light source and releasing the circulating water in the water tank.
Therefore, the vortex-induced vibration wake release test device and the test method based on optical refraction have the following advantages: the vortex characteristics of vortex-induced wake flow are presented on the screen based on the optical refraction principle, the characteristics of vortex discharge mode, discharge frequency, vortex size and the like of the wake flow can be clearly seen, the method is of great significance for accurately analyzing the vortex discharge characteristics, the optical refraction imaging is adopted, the flow field is not interfered, the properties of the fluid are not changed, the water body is not polluted, and the vortex-induced vibration wake flow discharge condition can be accurately reflected.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an explanatory view of the imaging principle of the present invention.
Fig. 3 is a top view of the present invention.
Fig. 4 is a schematic view of the structure of the protective member of the present invention.
Illustration of the drawings: 1-linear light source, 2-glass tube, 3-camera, 4-slide rail, 5-display screen, 6-slider, 7-base, 8-first incident light, 8 '-first refracted light, 9-second incident light, 9' -second refracted light, 10-vortex surface, 11-vortex refracted light, 12-horizontal refracted light, 13-highlight region, 14-water trough, 15-air bag layer, 16-protective piece, 17-connecting hole, 18-annular groove, 19-horizontal plane.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1:
as shown in figures 1 and 3, a vortex induced vibration wake flow discharge test device based on optical refraction comprises a linear light source 1 and a water tank 14 provided with circulating water, flow is generated in the water tank 14 through the circulating water, a display screen 5 is connected in the water tank 14 in a vertical sliding manner, the display screen 5 can slide in the water tank 14 in a vertical sliding manner, a base is arranged at the bottom of the water tank 14, a glass tube 2 penetrating through the display screen 5 is fixed on the base, a camera 3 is arranged on the side wall of the water tank 14, vortex wake flow is generated at a position close to the water surface after the water flow in the tank flows through the glass tube 2, the linear light source 1 obliquely irradiates into the water surface of a wake flow area, light is reflected on the display screen 5, according to actual conditions, the adjustment of images on the display screen 5 can be realized by adjusting the position of the display screen 5 in the water tank 14, comparative analysis of images of all position heights can also be realized by adjusting, the camera 3 records the image information presented on the display screen 5, so as to call the image information for post-processing analysis after the test is finished, clear vortex induced vibration wake vortex discharge images and picture data can be obtained through the test method, and various corresponding vortex discharge characteristics, such as vortex discharge modes, discharge frequencies, vortex sizes and the like, can be obtained through the analysis of the image data, and have significance for accurately analyzing the vortex discharge characteristics, the existing tracer wake vortex discharge display method has certain influence on a local flow field because a tracer outlet is equivalent to a fluid supplement source, and a bubble method or a metal particle method has certain influence on the properties of the fluid, so essentially, the existing method has certain influence on the flow field, and the method adopts optical refraction imaging and does not cause interference on the flow field, the flow field wake flow information of the fluid to be researched can be truly reflected without changing the property of the fluid.
The inner side wall of the water tank 14 is provided with a slide rail 4, the slide rail 4 is vertically arranged on the inner side wall of the water tank 14, the display screen 5 is provided with a slide block 6 which is in sliding connection with the slide rail 4, the height of the display screen 5 in the water tank 14 can be adjusted through the sliding of the slide block 6 on the slide rail 4, and the convenience is high; the slider 6 sets up on the both sides that are close to basin 14 lateral wall of display screen 5, and each side all sets up two sliders 6 for stability when adjusting the display screen 5 height is good, and the back can be fixed on slide rail 4 with the bolt after the position selection of slider 6 is good.
The glass tube 2 is connected with the display screen 5 through a protection piece 16 made of elastic material, as shown in fig. 4, an annular groove 18 for clamping with the display screen 5 is arranged on the outer wall of the protection piece 16 along the circumferential direction, a connecting hole 17 for connecting with the glass tube 2 is arranged at the center of the protection piece 16, the glass tube 2 for testing is fragile and is easy to break when being subjected to external force, especially when the height of the display screen 5 is adjusted, the protection piece 16 has elasticity, can play a good role of buffering and protecting the glass tube 2, and can prevent the glass tube 2 from breaking when the display screen 5 moves due to external force; the protective part 16 is provided with the air bag layer 15 around the glass tube 2, and the glass tube 2 can shake due to the impact of water flow circulating in the water tank 14 on the glass tube 2, and the shake of the glass tube 2 can be better counteracted by the arrangement of the air bag layer 15, so that the glass tube 2 can be kept stable, and the accuracy of a test result is improved; the protection member 16 is made of rubber material, and has good elasticity, low cost and long service life.
The theory behind the present invention is that when the first incident ray 8 is obliquely incident on the horizontal plane 19 (the incident angle is θ) as shown in FIG. 21) Refracted into the water body to produce a first refracted ray 8' (with an angle of refraction ofθ 2) When the second incident light 9 obliquely strikes the vortex surface 10 (the incident angle isα 1) Refracted into the water body to produce a second refracted ray 9' (with an angle of refraction ofα 2) At this time, the first refracted light ray 8 'generated by the horizontal plane 19 and the second refracted light ray 9' generated by the vortex plane 10 intersect at a point on the display screen 5, so that the superposition of the light intensity is generated, and theoretically, it can be known that, at the intersection of the horizontal plane 19 and the vortex plane 10, a horizontal refracted light ray 12 corresponding to the horizontal plane 19 and a vortex refracted light ray 11 corresponding to the vortex plane 10 are respectively made, wherein the interval defined by the horizontal refracted light ray 12 being parallel to the first refracted light ray 8 ', the vortex refracted light ray 11 being parallel to the second refracted light ray 9', the vortex refracted light ray 11 and the horizontal refracted light ray 12 on the display screen 5 is the strong light interval 13.
Although the angle of incidence of the second incident ray 9α 1The light beam is refracted and then superposed with the horizontal refracted light to generate a strong light zone 13, the principle is similar to that illustrated in fig. 2, and therefore, the light beam is refracted by the vortex surface 10 to form a zone on the display screen 5 which is similar to that of the vortexThe corresponding strong light section 13 is represented as a strong aperture.
A test method of the vortex-induced vibration wake flow release test device based on optical refraction is carried out according to the following steps:
fixing a glass tube 2, and fixing the glass tube 2 at the bottom of a water tank 14 through a base 7;
step two, filling water into the water tank 14 until the liquid level reaches the height required by the test, and opening circulating water to make flow;
step three, the linear light source 1 is turned on to enable light rays to obliquely enter the water surface, and the imaging condition of the refracted light rays on the display screen 5 is observed;
adjusting the position of the display screen 5, and adjusting the position of the display screen 5 by changing the height of the sliding block 6 on the sliding rail 4 to obtain an ideal wake vortex characteristic image;
fifthly, the camera 3 works, the camera 3 is turned on, the change situation of the wake vortex characteristic on the display screen 5 is recorded, and the camera 3 is turned off after the recording is finished;
step six, changing the flow velocity of the circulating water tank 14 to obtain a changed vortex street of vortex-induced vibration wake discharge, and repeating the steps 4-5;
and step seven, after the test is finished, closing the circulating water in the water tank 14, closing the linear light source 1 and releasing the circulating water in the water tank 14.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (5)
1. A vortex-induced vibration wake flow discharge test device based on optical refraction is characterized by comprising a linear light source and a water tank provided with circulating water, wherein a display screen is connected in the water tank in an up-and-down sliding manner, a base is arranged at the bottom of the water tank, a glass tube penetrating through the display screen is fixed on the base, and a camera is arranged on the side wall of the water tank; the glass tube is connected with the display screen through a protection piece made of elastic materials, an annular groove used for being clamped with the display screen is formed in the outer wall of the protection piece along the circumferential direction, and a connecting hole used for being connected with the glass tube is formed in the center of the protection piece; the protective part is provided with an air bag layer around the glass tube.
2. The vortex-induced vibration wake flow release test device based on optical refraction according to claim 1, wherein a slide rail is arranged on the inner side wall of the water tank, and a slide block connected with the slide rail in a sliding manner is arranged on the display screen.
3. The vortex-induced vibration wake flow relief test device based on optical refraction of claim 2, wherein the sliding blocks are arranged on two sides of the display screen close to the side wall of the water tank, and two sliding blocks are arranged on each side surface.
4. The vortex-induced vibration wake shedding test device based on optical refraction of claim 1, wherein the shielding element is made of rubber material.
5. The test method of the vortex-induced vibration wake flow release test device based on optical refraction as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
fixing a glass tube, namely fixing the glass tube at the bottom of a water tank through a base;
step two, filling water into the water tank until the liquid level reaches the height required by the test, and opening circulating water to make flow;
step three, the linear light source is incident, the linear light source is turned on, light rays are made to obliquely enter the water surface, and the imaging condition of the refracted light rays on the display screen is observed;
adjusting the position of the display screen, and adjusting the position of the display screen by changing the height of the sliding block on the sliding rail to obtain an ideal wake vortex characteristic image;
fifthly, the camera works, the camera is turned on, the change situation of wake vortex characteristics on the display screen is recorded, and the camera is turned off after the recording is finished;
step six, changing the flow velocity of the circulating water tank to obtain a changed vortex street with vortex-induced vibration wake discharge, and repeating the steps 4-5;
and step seven, after the test is finished, closing the circulating water in the water tank, closing the linear light source and releasing the circulating water in the water tank.
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| US8074720B2 (en) * | 2004-09-28 | 2011-12-13 | Vetco Gray Inc. | Riser lifecycle management system, program product, and related methods |
| CN101464522B (en) * | 2009-01-08 | 2011-06-29 | 西安电子科技大学 | System and method for detecting wake of dynamic target in water based on laser wavefront change |
| CN202119906U (en) * | 2011-07-06 | 2012-01-18 | 佛山科学技术学院 | Water wave characteristic research device based on Doppler effect |
| CN103438980B (en) * | 2013-09-01 | 2015-07-15 | 北京航空航天大学 | Method and device for liquid surface wave detection based on linear array CCD and linear infrared laser |
| KR101585648B1 (en) * | 2015-02-23 | 2016-01-15 | 홍익대학교 산학협력단 | Solitary wave generating wave channel |
| CN105181145B (en) * | 2015-11-13 | 2018-01-16 | 北京航空航天大学 | A kind of underwater polarization field analogy method of rough water transmitted light |
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