CN110375954A - A kind of vortex-induced vibration wake flow is released experimental rig and method - Google Patents
A kind of vortex-induced vibration wake flow is released experimental rig and method Download PDFInfo
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- CN110375954A CN110375954A CN201910615932.XA CN201910615932A CN110375954A CN 110375954 A CN110375954 A CN 110375954A CN 201910615932 A CN201910615932 A CN 201910615932A CN 110375954 A CN110375954 A CN 110375954A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
It releases experimental rig the invention discloses a kind of vortex-induced vibration wake flow, including fixed bracket, sink, source of parallel light lamp, display board and video camera；Bottom of gullet is equipped with the first fixing seat for fixing test body；Source of parallel light lamp is fixed with fixed bracket, and source of parallel light lamp is towards the flow surface near test structure body；For display board with source of parallel light lamp position in the opposite sides of test body and simultaneously positioned at the downstream of fixing seat, video camera setting is below display board and is directed at display board.It releases experimental rig and method the present invention provides a kind of vortex-induced vibration wake flow, stream field itself does not interfere when with display test result, fluid attribute itself is not changed, it can really reflect the flow field wake flow information of institute's Study of Fluid, and fluid itself is not polluted, the advantages that fluid is reusable.
Description
Technical field
The present invention relates to the test method technical fields that structure is vibrated in flow field, more particularly, to a kind of vortex-induced vibration tail
It flows and puts experimental rig and method.
Background technique
In engineering field, vortex-induced vibration phenomenon brings problems much more very, and the research work carried out to it is also very
Extensively.For object in the case where air, the water or other fluid of certain flow rate act on, tail portion can generate alternate vortex, lead to object two sides shape
At the pressure difference of pulsation, so as to cause the vibration of structure, such as high-tension cable, bridge, television tower, marine riser etc..Marine riser is
The important component of ocean platform, for the transmission of sea-bottom oil-gas, the vortex-induced vibration of marine riser can cause the fatigue of structure
It destroys, the vortex-induced vibration of marine floating type platform has an impact platform personnel work comfort, and equally also to anchor chain etc., other are attached
The fatigue rupture for belonging to structure has an impact, and the research of vortex-induced vibration at present is concentrated mainly on marine riser and floating structure hydrodynamic(al)
Force characteristic research field.The research method of vortex-induced vibration is mainly model test, and some scholars use traditional wake flow oscillator mould
Type and CFD approach make numerical simulation study.The wake flow state that would generally be released to vortex in experimental study is studied, in order to
The mode of releasing for accurately distinguishing wake flow generallys use trace method and carries out display test, and currently used method is tried using tracer
Agent, such as in vibrational structure outer wall aperture, inside has tracer reagent to project with wake flow, or is shown using bubble, metallic particles
Track, this method can to a certain degree reflect wake flow relief situation, but practice have shown that, effect be not it is ideal, vortex
Characterization is not apparent.The display test that wake vortices are released is carried out using trace method, due to using tracer, to a certain degree
Upper meeting polluted-water, when being tested in particular by recirculated water, water body can gradually be polluted by tracer, lead to the tracer of wake flow
Display is increasingly fuzzyyer.Foreign countries, which have, carries out tracer, but the precision of tracer and bubble or metal using bubble method or metallic particles
Granular size, random walk are closely related, while related to ambient light effect, the display effect that wake flow whirlpool is let out it is difficult to ensure that.
It, can during the test as far as possible therefore, it is necessary to invent a kind of vortex-induced vibration wake flow to release experimental rig and method
The interference for reducing stream field itself, can really reflect the flow field wake flow information of institute's Study of Fluid.
Chinese patent application publication number CN102252816B, publication date are on December 19th, 2012, a kind of entitled " cylinder
The test method of body vortex-induced vibration " discloses a kind of test method of vortex-induced vibration of cylinder.This method is only using that can distinguish
Vertical control fair current carries out the test of two-freedom vortex-induced vibration and list certainly to the experimental rig with lateral two freedom degrees vibration respectively
Tested by degree vortex-induced vibration, to two-freedom vortex-induced vibration test and single-degree-of-freedom vortex-induced vibration test the phenomenon that and data into
Row analysis, is compared single-degree-of-freedom and two-freedom vortex-induced vibration test analysis result.The invention can be in identical test
Under the conditions of complete fair current to or the test of lateral single-degree-of-freedom vortex-induced vibration and fair current to the test of lateral two-freedom vortex-induced vibration,
Realize flowing pressure, test model kinematic parameter (displacement, speed, acceleration) and the synchro measure released that is vortexed.But the party
Method still uses trace method display test, and there are still the above problems.
Summary of the invention
The present invention has interference, Wu Fazhen for the method stream field itself for overcoming the prior art to test display result in the process
Real display information of flow, and test process and have the problems such as pollution to fluid itself provides a kind of vortex-induced vibration wake flow and releases test
Device and method, stream field itself does not interfere when with display test result, does not change fluid attribute itself, can be true
Reflection institute Study of Fluid flow field wake flow information, and fluid itself is not polluted, the advantages that fluid is reusable.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of vortex-induced vibration wake flow is released experimental rig, comprising:
Fixed bracket, is used to fix other components of experimental rig；
Sink, is used to mention the flow field being for experiment, and fluid flows to the other end from one end of sink when test, and sink setting is solid
Below fixed rack, bottom of gullet is equipped with the first fixing seat for fixing test body；
Source of parallel light lamp is used to provide source of parallel light, and source of parallel light lamp is fixed with fixed bracket, source of parallel light lamp direction test
Flow surface near structural body；
Display board is used to project the test light reflected by fluid upper surface, and display board and source of parallel light lamp position are in test body
Opposite sides and simultaneously be located at fixing seat downstream；
Video camera is used to collect and record the image information on display board, and video camera setting is below display board and alignment is aobvious
Show plate.
In above-mentioned technical proposal, the sink is the common circulating water chennel of fluid test, is capable of providing the steady of specific flow velocity
Constant current body.Above-mentioned experimental rig is based on optical reflection principle, the vortex feature that vortex-induced vibration wake flow is released is presented on display board
On, it is clear that the vortex of wake flow is released mode, frequency of releasing, the features such as vortex size are let out convenient for accurately analyzing whirlpool
Feature.And when being tested using above-mentioned experimental rig, detection device does not contact directly with fluid, is only acquired by reflective mechanism
Information of flow, will not stream field generate interference, do not change fluid attribute itself, can really reflect the flow field of institute's Study of Fluid
Wake flow information.
Preferably, the fixed bracket is equipped with the second fixing seat for fixing test body upper end.Described second is solid
Reservation can fix fixed test body upper end, can according to need to obtain test data when test body both ends are fixed.
Preferably, further including the sliding rail and sliding block being mutually adapted, sliding rail is fixed on fixed bracket, sliding block and display board
It is fixed；Sliding block is equipped with puller bolt, and puller bolt is threadedly coupled with sliding block, and puller bolt one end is contacted with sliding rail.It is described
Structure makes the height-adjustable of display board, can adjust display board height in test, obtain clearest trial image.It needs
When adjusting height, puller bolt is unclamped, after display board is adjusted to proper height, tightens puller bolt.
Preferably, the sink bottom surface and side are equipped with dark coating, dark coating is coarse with fluid contact surfaces
Surface.The dark color coating can reduce influence of the reflected light of sink bottom surface and side to image is tested on display board.It is coarse
Surface can generate mirror-reflection to avoid sink bottom surface and side.
Preferably, further include light source connector, light source connector includes pedestal, rotating block and handle nut, pedestal with
Fixed bracket is fixed, and rotating block is fixed with source of parallel light lamp, and rotating block is equipped with rotation hole, and pedestal is equipped with rotation axis, rotation
Axis is adapted to rotation hole, and one end of rotation axis passes through rotation hole, and handle nut is threadedly coupled with rotation axis and compresses rotating block.Institute
Stating structure keeps the incident angle of source of parallel light lamp adjustable, convenient for adjusting the incident angle of source of parallel light lamp as needed.And it adjusts
Adjusting method is simple, only needs that source of parallel light lamp is turned to proper angle after release handle nut, then handle nut is tightened.
A kind of vortex-induced vibration wake flow based on optical reflection is released test method, using a kind of above-mentioned vortex-induced vibration wake flow
It releases experimental rig, comprising the following steps:
A., test body is installed: the bottom end of test body is fixed on bottom of gullet；
B. sink with water is filled the water to circulating water chennel, until liquid level reaches test desired height, is opened recirculated water and is carried out making stream；
C. it turns on light source: source of parallel light lamp is opened, the vortex that alignment test body tail portion is formed, and make reflective reflection in display board
On；
D. data are recorded: needing to control the flow velocity of fluid in sink according to test, and opens video camera, display board is directed at, passes through
Image on camera recordings display board, record close video camera after the completion；
E. test of many times: changing the flow velocity of fluid in sink according to test demand, repeat step b to step d, until completing to test
Data under required various flow velocitys；
F. analysis of experiments: the image information that video camera is obtained carries out processing analysis, obtains corresponding various vortexs and releases features,
If vortex is released mode, frequency of releasing, vortex size etc.；
G. sink recirculated water is closed in off-test, closes source of parallel light lamp, discharges the recirculated water in sink.
Clearly vortex-induced vibration wake vortices can be obtained by above-mentioned test method to release image and picture information, led to
Cross the analysis to image data, available corresponding various vortexs are released features, if vortex is released mode, frequency of releasing, rotation
Whirlpool size etc..And this method is imaged using optical reflection, stream field itself does not interfere, and does not change fluid attribute itself, energy
The flow field wake flow information of enough true reflection institute's Study of Fluid.The present invention is significant for the research of structure vortex-induced vibration,
The vortex properties study of tail flow field is even more to have direct reference significance when for vortex-induced vibration.
Preferably, can be adjusted according to the needs display board height when being tested, until display board shows clearly shadow
Picture.According to the actual situation, the adjusting to the image definition on display board can be realized by the height and position of display board；May be used also
With in liquid level difference, the image of the display board of liquid level is adopted in the position height realization by adjusting display board
Collection, and comparative analysis.
Preferably, can according to need when installation test body and fix test body upper end and fixed bracket.Above-mentioned technology
The test data of test body under the available both ends stationary state of scheme.
The beneficial effects of the present invention are: (1) stream field itself does not interfere, fluid attribute itself, Neng Gouzhen are not changed
The flow field wake flow information of real reflection institute Study of Fluid；(2) test method is simple, easy to operate；(3) test imaging results can be grown
Phase saves；(4) test fluid may be reused, and test process is pollution-free to fluid.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is top view in the present invention；
Fig. 3 is the structural schematic diagram of light source connector in the present invention；
Fig. 4 is that schematic illustration is tested in the present invention.
In figure: fixed bracket 1, sink 2, source of parallel light lamp 3, display board 4, video camera 5, test body 6, the first fixing seat 7,
Second fixing seat 8, sliding rail 9, sliding block 10, light source connector 11, pedestal 11.1, rotating block 11.2, handle nut 11.3, rotation hole
11.4, rotation axis 11.5.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
Embodiment 1:
As shown in Figure 1, Figure 2 and Figure 3, a kind of vortex-induced vibration wake flow is released experimental rig, including fixed bracket 1, sink 2, parallel
Illuminator 3, display board 4, video camera 5, light source connector 11, the setting of sink 2 is below fixed bracket 1, and fluid is from water when test
One end of slot 2 flows to the other end, and fluid is flowed to as shown in arrow F in Fig. 2, and 2 bottom surface of sink and side are equipped with dark coating, dark
Coating and fluid contact surfaces are rough surface, and 2 bottom of sink is equipped with the first fixing seat 7 for fixing test body 6；First is solid
Test body 6 is fixed in reservation 7, liquid level upper surface is stretched out in 6 one end of test body；
Source of parallel light lamp 3 is towards the flow surface near test structure body；Light source connector 11 includes pedestal 11.1, rotating block
11.2 and handle nut 11.3, pedestal 11.1 and fixed bracket 1 are fixed, and rotating block 11.2 and source of parallel light lamp 3 are fixed, rotating block
11.2 are equipped with rotation hole 11.4, and pedestal 11.1 is equipped with rotation axis 11.5, and rotation axis 11.5 is adapted to rotation hole 11.4, rotate
One end of axis 11.5 passes through rotation hole 11.4, and handle nut 11.3 is threadedly coupled with rotation axis 11.5 and compresses rotating block 11.2；
Display board 4 and source of parallel light lamp 3 are located at the opposite sides of test body 6 and are located at the downstream of fixing seat simultaneously；It further include phase
The sliding rail 9 and sliding block 10 being mutually adapted to, sliding rail 9 are fixed on fixed bracket 1, and sliding block 10 and display board 4 are fixed；Sliding block 10 is equipped with
Puller bolt, puller bolt are threadedly coupled with sliding block 10, and puller bolt one end is contacted with sliding rail 9；Video camera 5 and fixed bracket
1 is fixed, and video camera 5 is arranged below display board 4 and alignment display board 4.
Above-mentioned experimental rig is based on optical reflection principle, the vortex feature that vortex-induced vibration wake flow is released is presented on display
On plate 4, it is clear that the vortex of wake flow is released mode, frequency of releasing, the features such as vortex size, convenient for accurate analysis whirlpool
Let out feature.And when being tested using above-mentioned experimental rig, detection device does not contact directly with fluid, is only adopted by reflective mechanism
Current collecting field information, will not stream field generate interference, do not change fluid attribute itself, can really reflect the stream of institute's Study of Fluid
Field wake flow information.Theoretical foundation of the invention passes through as shown in figure 4, when horizontal plane is arrived in the oblique fire of incident ray 12 (incidence angle is θ 1)
Reflection light 12 ' (angle of reflection is θ 2) is generated after water-reflected, (incidence angle is α 1), warp when vortex face is arrived in the oblique fire of incident ray 13
Reflection light 13 ' (angle of reflection is α 2) is generated after water-reflected, the reflected light 13 ' that vortex face generates at this time can't be as horizontal plane
The reflected light 12 ' of generation equally projects on a display screen, and the reflected light that vortex face generates can be in contact with vortex face again, or
Person is reflected into the other positions except display screen ash dark space, theoretically analysis it is found that horizontal plane and vortex face intersection
Reflection light 14 and reflection light 15 with respect to the horizontal plane are done in both ends respectively, wherein reflection light 14 and reflection light 15 with
Reflection light 12 ' in parallel, reflection light 14 and reflection light 15 on a display screen defined by section be grey dark space, therefore
Light can form a grey dark space corresponding with vortex after the reflection of vortex curved surface on a display screen.
Embodiment 2:
As shown in Figure 1, on the basis of embodiment 1, the fixed bracket 1 is equipped with second for fixing 6 upper end of test body
Fixing seat 8.Second fixing seat 8 can fix fixed 6 upper end of test body, can according to need to obtain 6 both ends of test body
Test data when fixed.
Embodiment 3:
A kind of vortex-induced vibration wake flow based on optical reflection is released test method, using one of embodiment 1 or embodiment 2 whirlpool
Excited vibration wake flow is released experimental rig, comprising the following steps:
A., test body 6 is installed: one end of test body 6 being fixed as needed or both ends are fixed；
B. 2 water-filling of sink is filled the water to circulating water chennel 2, until liquid level reaches test desired height, is opened recirculated water and is carried out making stream；
C. it turns on light source: source of parallel light lamp 3 is opened, the vortex that 6 tail portion of alignment test body is formed adjusts 4 height of display board, makes
The image definition of reflective reflection is shown on display board 4；
D. data are recorded: needing to control the flow velocity of fluid in sink 2 according to test, and opens video camera, are directed at display board 4, are led to
The image on camera recordings display board 4 is crossed, closes video camera 5 after the completion of record；
E. test of many times: changing the flow velocity of fluid in sink 2 according to test demand, repeat step b to step d, until completing to try
Data under various flow velocitys needed for testing；
F. analysis of experiments: the image information that video camera is obtained carries out processing analysis, obtains corresponding various vortexs and releases features,
If vortex is released mode, frequency of releasing, vortex size etc.；
G. 2 recirculated water of sink is closed in off-test, closes source of parallel light lamp 3, discharges the recirculated water in sink 2.
Clearly vortex-induced vibration wake vortices can be obtained by above-mentioned test method to release image and picture information, led to
Cross the analysis to image data, available corresponding various vortexs are released features, if vortex is released mode, frequency of releasing, rotation
Whirlpool size etc..And this method is imaged using optical reflection, stream field itself does not interfere, and does not change fluid attribute itself, energy
The flow field wake flow information of enough true reflection institute's Study of Fluid.The present invention is significant for the research of structure vortex-induced vibration,
The vortex properties study of tail flow field is even more to have direct reference significance when for vortex-induced vibration.
The beneficial effects of the present invention are: stream field itself does not interfere, do not change fluid attribute itself, it can be true
Reflect the flow field wake flow information of institute's Study of Fluid；Test method is simple, easy to operate；Testing imaging results can long-term preservation；Examination
Testing fluid may be reused, and test process is pollution-free to fluid.
Claims (8)
- The experimental rig 1. a kind of vortex-induced vibration wake flow is released, characterized in that include:Fixed bracket, is used to fix other components of experimental rig；Sink, is used to mention the flow field being for experiment, and fluid flows to the other end from one end of sink when test, and sink setting is solid Below fixed rack, bottom of gullet is equipped with the first fixing seat for fixing test body；Source of parallel light lamp is used to provide source of parallel light, and source of parallel light lamp is fixed with fixed bracket, source of parallel light lamp direction test Flow surface near structural body；Display board is used to project the test light reflected by fluid upper surface, and display board and source of parallel light lamp position are in test body Opposite sides and simultaneously be located at fixing seat downstream；Video camera is used to collect and record the image information on display board, and video camera setting is below display board and alignment is aobvious Show plate.
- The experimental rig 2. a kind of vortex-induced vibration wake flow according to claim 1 is released, characterized in that on the fixed bracket Equipped with the second fixing seat for fixing test body upper end.
- The experimental rig 3. a kind of vortex-induced vibration wake flow according to claim 1 is released, characterized in that further include being mutually adapted Sliding rail and sliding block, sliding rail is fixed on fixed bracket, and sliding block is fixed with display board；Sliding block is equipped with puller bolt, holds out against spiral shell Bolt is threadedly coupled with sliding block, and puller bolt one end is contacted with sliding rail.
- The experimental rig 4. a kind of vortex-induced vibration wake flow according to claim 1 is released, characterized in that the sink bottom surface and Side is equipped with dark coating, and dark coating and fluid contact surfaces are rough surface.
- The experimental rig 5. a kind of vortex-induced vibration wake flow according to claim 1 is released, characterized in that further include light source connection Seat, light source connector include pedestal, rotating block and handle nut, and pedestal is fixed with fixed bracket, rotating block and source of parallel light lamp Fixed, rotating block is equipped with rotation hole, and pedestal is equipped with rotation axis, and rotation axis is adapted to rotation hole, and one end of rotation axis is worn Rotation hole is crossed, handle nut is threadedly coupled with rotation axis and compresses rotating block.
- The test method 6. a kind of vortex-induced vibration wake flow based on optical reflection is released, using any one of claim 1-5 description A kind of vortex-induced vibration wake flow is released experimental rig, characterized in that the following steps are included:A., test body is installed: the bottom end of test body is fixed on bottom of gullet；B. sink with water is filled the water to circulating water chennel, until liquid level reaches test desired height, is opened recirculated water and is carried out making stream；C. it turns on light source: source of parallel light lamp is opened, the vortex that alignment test body tail portion is formed, and make reflective reflection in display board On；D. data are recorded: needing to control the flow velocity of fluid in sink according to test, and opens video camera, display board is directed at, passes through Image on camera recordings display board, record close video camera after the completion；E. test of many times: changing the flow velocity of fluid in sink according to test demand, repeat step b to step d, until completing to test Data under required various flow velocitys；F. analysis of experiments: the image information that video camera is obtained carries out processing analysis, obtains corresponding various vortexs and releases features, If vortex is released mode, frequency of releasing, vortex size etc.；G. sink recirculated water is closed in off-test, closes source of parallel light lamp, discharges the recirculated water in sink.
- The test method 7. a kind of vortex-induced vibration wake flow based on optical reflection according to claim 6 is released, characterized in that When being tested, display board height can be adjusted according to the needs, until display board shows clearly image.
- The test method 8. a kind of vortex-induced vibration wake flow based on optical reflection according to claim 6 is released, characterized in that When test body is installed, it can according to need and fix test body upper end and fixed bracket.
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