CN111947880B - Experiment table for researching influence of boundary on shedding vortex frequency locking - Google Patents
Experiment table for researching influence of boundary on shedding vortex frequency locking Download PDFInfo
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- CN111947880B CN111947880B CN202010895787.8A CN202010895787A CN111947880B CN 111947880 B CN111947880 B CN 111947880B CN 202010895787 A CN202010895787 A CN 202010895787A CN 111947880 B CN111947880 B CN 111947880B
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Abstract
The present disclosure provides a laboratory bench for exploring the impact of boundary on shedding vortex frequency locking, comprising: the wind tunnel component, the vibration component, the test piece and the base, the vibration component is arranged below the wind tunnel component, the vibration component and the wind tunnel component are fixedly connected with the base, the test piece is fixedly connected with the vibration end of the vibration component, and the test piece is arranged in the wind tunnel component. The beneficial effect that this disclosure can reach is for can effectually getting rid of the influence that fluid-solid coupling effect brought to more audio-visual exploration boundary can also carry out the decoupling zero to vibration amplitude and frequency simultaneously to the influence law of vibration frequency and vibration amplitude for the influence of shedding vortex frequency locking characteristic is studied. The upper wall surface and the lower wall surface of the wind tunnel flow channel are adjustable, so that more choices can be made in the process of researching the boundary effect, one wall surface can be fixed, only the other wall surface is adjusted to research the influence effect of a single wall surface, and the influence effect of double wall surfaces can be simultaneously adjusted and researched by the two wall surfaces.
Description
Technical Field
The disclosure relates to the field of tests, in particular to a test bench for researching influence of a boundary on shedding vortex frequency locking.
Background
Shedding vortex frequency locking (resonance) is a nonlinear phenomenon which is widely concerned in bridge design, submarine cable and turbine design, and is always a popular problem for research in the industry and academia. In recent years, when researchers encounter some practical engineering problems, such as vibration of blades in submarine buried cables, near-ground bridge decks and narrow passages, the influence of boundaries on the locking of shedding vortices is receiving more and more attention, and it becomes important to explore the influence of boundaries on the locking phenomenon of the frequency of the shedding vortices.
The prior technical scheme can be divided into the following steps according to working media: wind tunnel experiment table and basin experiment table. The height of the flow channel is kept unchanged, the influence of the boundary on the frequency response characteristic of the shedding vortex is researched by adjusting the distance from the test piece to the boundary of the flow channel, and most of experiment tables adopt free vibration structures, namely the vibration amplitude and the frequency of the test piece are completely determined by the shedding vortex.
Most of the research work is currently done by free vibration systems, which are closer to practical engineering applications, but due to the fluid-solid coupling effect, it is difficult to ascertain the physical nature of the boundary influence, for example, it is difficult to clearly lock whether the hysteresis near the boundary is caused by fluid-solid coupling or by simple flow field changes.
Because the influence effect of the boundary is researched through the forced vibration system, the traditional scheme of fixing the height of the flow channel and moving the test piece without changing the height is not applicable any more, and a new technical scheme for researching the influence of the boundary is required to be searched
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides an experiment table which is adjustable in height and can flexibly change the blockage ratio of a wind tunnel and is used for researching the locking influence of a boundary on the shedding vortex frequency;
a bench for exploring the impact of boundary on shed vortex frequency locking, comprising: the device comprises a wind tunnel component, a vibration component, a test piece and a base, wherein the vibration component is arranged below the wind tunnel component, the vibration component and the wind tunnel component are fixedly connected with the base, the test piece is fixedly connected with the vibration end of the vibration component, and the test piece is arranged in the wind tunnel component;
the wind tunnel component comprises an upper wall surface, a lower wall surface and side wall surfaces, wherein the upper wall surface and the lower wall surface are arranged in parallel, the two side wall surfaces are arranged vertically, the left side edge and the right side edge of the upper wall surface are fixedly connected with the inner side surfaces of the side wall surfaces through connecting components, and the left side edge and the right side edge of the lower wall surface are fixedly connected with the inner side surfaces of the side wall surfaces through the connecting components;
coupling assembling includes a plurality of bolts, the both ends of lateral wall face are from last to being provided with a plurality of through-holes down, go up the wall face the both ends of controlling the side of wall all are provided with the screw hole down, the bolt passes the through-hole with screw hole threaded connection.
Specifically, the vibration assembly comprises a signal assembly, a vibration exciter and a support, the vibration exciter is fixedly connected with the base, the lower end of the support is fixedly connected with the vibration end of the vibration exciter, and the test piece is fixedly connected with the upper end of the support.
Specifically, the support includes U type pole and straight-bar, the vertical setting of straight-bar, the lower extreme of straight-bar with vibration exciter fixed connection, the upper end of straight-bar with the horizontal pole middle-end fixed connection of U type pole, two montants of U type pole set up respectively two the outside of lateral wall face, the both ends of test piece pass through the connecting rod with two of U type pole the upper end fixed connection of montant.
Preferably, the test piece and the side wall surface are arranged vertically, a vertical through groove is formed in the side wall surface, and the connecting rod penetrates through the vertical through groove to be fixedly connected with the test piece and the support.
Specifically, the signal assembly comprises a signal generator and a signal amplifier, and a signal output by the signal generator is amplified by the signal amplifier and then is input to the vibration exciter.
Further, the vibration assembly further comprises an acceleration sensor, and the acceleration sensor is fixedly connected with the support.
Specifically, the wind tunnel assembly further comprises a hot wire sensor and a hot wire probe, the hot wire sensor is fixedly connected with the inner side surface of the side wall surface, the hot wire sensor is located at the upwind position of the test piece, the hot wire probe is fixedly connected with the upper wall surface, and the hot wire probe is located at the downwind position of the test piece.
Preferably, the heat wire probe is fixedly connected to the upper wall surface through an adjustable snap ring, and the heat wire probe is slidable up and down along the snap ring.
According to at least one embodiment of the present disclosure, the present disclosure can achieve the following advantageous effects:
the forced vibration system adopted by the experiment table can effectively eliminate the influence caused by fluid-solid coupling effect, thereby more intuitively exploring the influence of the boundary on the shedding vortex frequency locking characteristic, decoupling the vibration amplitude and the frequency and respectively researching the influence law of the vibration frequency and the vibration amplitude.
The upper wall surface and the lower wall surface of the wind tunnel flow channel of the test bed are adjustable, so that more choices can be provided when boundary effects are researched, one wall surface can be fixed, only the other wall surface is adjusted, the influence effect of a single wall surface is researched, and the influence effect of double wall surfaces is researched by adjusting the two wall surfaces simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic structural diagram of a laboratory bench for investigating the impact of boundaries on shed vortex frequency locking according to the present disclosure.
FIG. 2 is an experimental runner side view of an experimental bench for investigating the impact of boundary locking on shed vortex frequency according to the present disclosure.
Reference numerals: 1-side wall surface, 2-upper wall surface, 3-lower wall surface, 4-test piece, 5-U-shaped rod, 6-connecting rod, 7-vibration exciter, 8-straight rod, 9-acceleration sensor, 10-snap ring, 11-hot wire probe and 12-hot wire sensor.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A bench for exploring the impact of boundary on shed vortex frequency locking, comprising: wind-tunnel subassembly, vibration subassembly, test piece 4 and base, the vibration subassembly sets up in the below of wind-tunnel subassembly, vibration subassembly and wind-tunnel subassembly all with base fixed connection, test piece 4 and vibration assembly's vibration end fixed connection, test piece 4 sets up in the wind-tunnel subassembly.
The wind tunnel component comprises an upper wall surface 2, a lower wall surface 3 and a side wall surface 1, wherein the upper wall surface 2 and the lower wall surface 3 are arranged in parallel, the two side wall surfaces 1 are arranged vertically, the left side edge and the right side edge of the upper wall surface 2 are fixedly connected with the inner side surface of the side wall surface 1 through a connecting component, and the left side edge and the right side edge of the lower wall surface 3 are fixedly connected with the inner side surface of the side wall surface 1 through a connecting component.
The above structure is a basic structure, and in order to ensure that it can satisfy the experimental purpose of exploring the wall effect, the flow channel is a rectangular flow channel with a length L of 1800mm, a width w of 308mm, and a height (60mm ≦ H ≦ 300mm), and the test piece 4 is an organic glass cylinder with a length L of 300mm and a diameter D of 30 mm.
The vibration assembly is connected with the base of the wind tunnel through the bolt, and a layer of rubber pad is arranged between the wind tunnel base and the vibration assembly, so that the vibration assembly can stably output vibration signals, and the wall surface of the flow channel is made of organic glass materials, so that the observability of the interior of the flow channel is ensured.
The coupling assembling includes a plurality of bolts, and the both ends of lateral wall face 1 are provided with a plurality of through-holes from last to down, and the both ends of the side all are provided with the screw hole about 2/lower wall face 3 of upper wall face, and the bolt passes through the through-hole and screw hole threaded connection.
The upper wall surface 2, the lower wall surface 3 and the side wall surface 1 are fixedly connected through bolts, so that the distance between the upper wall surface 2 and the lower wall surface 3 can be adjusted, the distance can be selected between (H is more than or equal to 60mm and less than or equal to 300mm), and the height of the flow channel can be adjusted and the upper wall surface 3 and the lower wall surface 3 can be fixed again after each group of experiments are completed.
For adjustment, the position of the through hole also needs to be positioned, and the positioning can be set according to the requirement of the through hole.
In addition, in order to increase the stepless adjustment capacity, a plurality of through holes can be connected in an open mode to form a through groove, the upper wall surface 2 and the lower wall surface 3 can slide up and down along the through groove, and then the fixing is achieved through tightening bolts.
Meanwhile, the device can have more choices in the process of researching the boundary effect according to requirements in the using process, one wall surface can be fixed, only the other wall surface is adjusted, the influence effect of the single wall surface is researched, and the influence effect of the double wall surfaces is researched by adjusting the two wall surfaces simultaneously.
The vibration assembly comprises a signal assembly, a vibration exciter 7 and a support, the vibration exciter 7 is fixedly connected with the base, the lower end of the support is fixedly connected with the vibration end of the vibration exciter 7, and the test piece 4 is fixedly connected with the upper end of the support.
The vibration generator is connected with the base of the wind tunnel through a bolt, and a layer of rubber pad is arranged between the wind tunnel base and the vibration generator 7, so that the vibration generator 7 can stably output vibration signals.
The vibration exciter 7 can provide continuous vibration perpendicular to the incoming flow direction for the test piece 4 according to the excitation signal, the vibration frequency range is 0-2 KHz, and the vibration amplitude is +/-10 mm.
The support includes U type pole 5 and straight-bar 8, the vertical setting of straight-bar 8, the lower extreme and the vibration exciter 7 fixed connection of straight-bar 8, the upper end of straight-bar 8 and the horizontal pole middle-end fixed connection of U type pole 5, two montants of U type pole 5 set up respectively in the outside of two lateral wall surfaces 1, the upper end fixed connection of connecting rod 6 and two montants of U type pole 5 is passed through at the both ends of test piece 4.
The test piece 4 is perpendicular to the side wall surface 1, a vertical through groove is formed in the side wall surface 1, and the connecting rod 6 penetrates through the vertical through groove to be fixedly connected with the test piece 4 and the support.
The signal assembly comprises a signal generator and a signal amplifier, and a signal output by the signal generator is amplified by the signal amplifier and then is input to the vibration exciter 7.
The excitation signal of exciter 7 is supplied by a signal generator (rig Model DG1022Z) which can supply analog signals such as sine, cosine, square wave, etc., and can precisely adjust the amplitude and frequency of the signal for experimental purposes. The signal generated by the signal generator is amplified by a signal amplifier (SHIAO Model SA-PA050) so that it can provide an excitation signal for the exciter 7.
The vibration component further comprises an acceleration sensor 9, and the acceleration sensor 9 is fixedly connected with the support.
The acceleration sensor 9 is used for monitoring the acceleration change signal of the bracket, and the vibration amplitude and the vibration frequency of the bracket can be converted, so that the effect of monitoring and adjusting the vibration of the test piece 4 is achieved.
The coupling assembling includes a plurality of bolts, and the both ends of lateral wall face 1 are provided with a plurality of through-holes from last to down, and the both ends of the side all are provided with the screw hole about 2/lower wall face 3 of upper wall face, and the bolt passes through the through-hole and screw hole threaded connection.
The upper wall surface 2, the lower wall surface 3 and the side wall surface 1 are fixedly connected through bolts, so that the distance between the upper wall surface 2 and the lower wall surface 3 can be adjusted, the distance can be selected between (H is more than or equal to 60mm and less than or equal to 300mm), and the height of the flow channel can be adjusted and the upper wall surface 3 and the lower wall surface 3 can be fixed again after each group of experiments are completed.
For adjustment, the position of the through hole also needs to be positioned, and the positioning can be set according to the requirement of the through hole.
In addition, in order to increase the stepless adjustment capacity, a plurality of through holes can be connected in an open mode to form a through groove, the upper wall surface 2 and the lower wall surface 3 can slide up and down along the through groove, and then the fixing is achieved through tightening bolts.
Meanwhile, the device can have more choices in the process of researching the boundary effect according to requirements in the using process, one wall surface can be fixed, only the other wall surface is adjusted, the influence effect of the single wall surface is researched, and the influence effect of the double wall surfaces is researched by adjusting the two wall surfaces simultaneously.
The wind tunnel component further comprises a hot wire sensor 12 and a hot wire probe 12, wherein the hot wire sensor 12 is fixedly connected with the inner side surface of the side wall surface 1, the hot wire sensor 12 is located at the upwind position of the test piece 4, the hot wire probe 12 is fixedly connected with the upper wall surface 2, the hot wire probe 12 is located at the downwind position of the test piece 4, the hot wire probe 12 is fixedly connected with the upper wall surface 2 through an adjustable clamping ring 10, and the hot wire probe 12 can slide up and down along the clamping ring 10.
As shown in fig. 2, the test piece 4 is placed by a bracket at the center position of the flow channel, i.e., L1-L2-30D, where the boundary layer of the upper and lower wall surfaces 3 caused by the incoming flow has completely developed, and the distances of the test piece from the upper wall surface 2/the lower wall surface 3 of the flow channel are equal.
In order to monitor the incoming flow velocity in the flow channel, a hotline sensor 12 of Model (Model 55P11) is mounted on the side wall surface 1 of the flow channel by a nut at a position L3 equal to 17D upstream of the test piece 4, and the hotline sensor 12 and the test piece 4 are ensured to be on the same horizontal plane.
Similarly, in order to monitor the trailing velocity of the test piece 4, a hot wire probe 12 of Model (Model 55P11) was placed at a position L4 ═ 2D downstream of the test piece 4, and the vertical position of the hot wire probe 12 was continuously adjustable until the probe could obtain a stable signal with minimum background noise, and thus the vertical position of the probe was different according to different heights of the flow paths.
Fast fourier decomposition (FFT) is performed on the wake signal detected by the hot-wire sensor 12, and the shedding vortex frequency under the corresponding working condition can be calculated. In order to facilitate the adjustment of the height of the flow channel, the flow channel is placed in an open wind tunnel, the open wind tunnel mainly comprises an experimental section, a diffusion section, a corner section, a transition section, a power section, a stable section, a contraction section and the like, the flow of the wind tunnel is controlled by a fan with a variable speed controller, and the wind tunnel can realize the continuous adjustment of the wind speed from 0.1m/s to 50 m/s.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (7)
1. A laboratory bench for exploring the impact of boundary on shedding vortex frequency locking, comprising: the device comprises a wind tunnel component, a vibration component, a test piece and a base, wherein the vibration component is arranged below the wind tunnel component, the vibration component and the wind tunnel component are fixedly connected with the base, the test piece is fixedly connected with the vibration end of the vibration component, and the test piece is arranged in the wind tunnel component;
the wind tunnel component comprises an upper wall surface, a lower wall surface and side wall surfaces, wherein the upper wall surface and the lower wall surface are arranged in parallel, the two side wall surfaces are arranged vertically, the left side edge and the right side edge of the upper wall surface are fixedly connected with the inner side surfaces of the side wall surfaces through connecting components, and the left side edge and the right side edge of the lower wall surface are fixedly connected with the inner side surfaces of the side wall surfaces through the connecting components;
the connecting assembly comprises a plurality of bolts, a plurality of through holes are formed in two ends of the side wall surface from top to bottom, threaded holes are formed in two ends of the left side edge and the right side edge of the upper wall surface/the lower wall surface, and the bolts penetrate through the through holes to be in threaded connection with the threaded holes, so that the distance between the upper wall surface and the lower wall surface can be adjusted;
the wind tunnel component further comprises a hot wire probe, the hot wire probe is fixedly connected with the upper wall surface through an adjustable clamping ring, the hot wire probe is located at the downwind position of the test piece, and the hot wire probe can slide up and down along the clamping ring.
2. The experiment table for researching influence of boundary on shedding vortex frequency locking as claimed in claim 1, wherein the vibration assembly comprises a signal assembly, a vibration exciter and a bracket, the vibration exciter is fixedly connected with the base, the lower end of the bracket is fixedly connected with the vibration end of the vibration exciter, and the test piece is fixedly connected with the upper end of the bracket.
3. The experiment table for researching the influence of the boundary on the locking of the shedding vortex frequency as claimed in claim 2, wherein the support comprises a U-shaped rod and a straight rod, the straight rod is vertically arranged, the lower end of the straight rod is fixedly connected with the vibration exciter, the upper end of the straight rod is fixedly connected with the middle end of a cross rod of the U-shaped rod, two vertical rods of the U-shaped rod are respectively arranged at the outer sides of the two side wall surfaces, and the two ends of the test piece are fixedly connected with the upper ends of the two vertical rods of the U-shaped rod through connecting rods.
4. The experiment table for researching influence of boundary on shedding vortex frequency locking as claimed in claim 3, wherein the test piece is vertically arranged with the side wall surface, a vertical through groove is arranged on the side wall surface, and the connecting rod passes through the vertical through groove to be fixedly connected with the test piece and the bracket.
5. The experimental bench for studying the influence of the boundary on the shed eddy frequency locking as claimed in claim 2, wherein the signal assembly comprises a signal generator and a signal amplifier, and the signal output by the signal generator is amplified by the signal amplifier and then input into the vibration exciter.
6. The experimental bench for investigating the impact of boundary on shed vortex frequency locking as claimed in claim 2, wherein said vibration assembly further comprises an acceleration sensor fixedly connected to said support.
7. The experimental rig for investigating the influence of boundary locking on shed vortex frequency as claimed in claim 1, wherein the wind tunnel assembly further comprises a hot wire sensor fixedly connected to the inner side surface of the side wall surface, and the hot wire sensor is located upwind of the test piece.
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| CN102323031A (en) * | 2011-08-12 | 2012-01-18 | 上海交通大学 | Deep-sea pipeline segmented model bidirectional forced vibration experimental device under action of uniform flow |
| CN107356398A (en) * | 2017-07-19 | 2017-11-17 | 云南电网有限责任公司电力科学研究院 | A kind of wind tunnel methods and device |
| CN108303228A (en) * | 2017-08-08 | 2018-07-20 | 北京空天技术研究所 | A kind of boundary layer fluidised form control device and method of wind tunnel test |
| CN109799049A (en) * | 2019-03-06 | 2019-05-24 | 北京理工大学 | A kind of elastic cylinder vortex-induced vibration rule and coupling mechanism measuring method |
| CN209194317U (en) * | 2018-11-23 | 2019-08-02 | 郑州大学 | The device of Vortex Shedding position when a kind of research cable whirlpool vibration |
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2020
- 2020-08-31 CN CN202010895787.8A patent/CN111947880B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323031A (en) * | 2011-08-12 | 2012-01-18 | 上海交通大学 | Deep-sea pipeline segmented model bidirectional forced vibration experimental device under action of uniform flow |
| CN107356398A (en) * | 2017-07-19 | 2017-11-17 | 云南电网有限责任公司电力科学研究院 | A kind of wind tunnel methods and device |
| CN108303228A (en) * | 2017-08-08 | 2018-07-20 | 北京空天技术研究所 | A kind of boundary layer fluidised form control device and method of wind tunnel test |
| CN209194317U (en) * | 2018-11-23 | 2019-08-02 | 郑州大学 | The device of Vortex Shedding position when a kind of research cable whirlpool vibration |
| CN109799049A (en) * | 2019-03-06 | 2019-05-24 | 北京理工大学 | A kind of elastic cylinder vortex-induced vibration rule and coupling mechanism measuring method |
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