CN113047464A - Passive sweeping jet device for inhibiting wind-induced vibration of large building structure - Google Patents
Passive sweeping jet device for inhibiting wind-induced vibration of large building structure Download PDFInfo
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- CN113047464A CN113047464A CN202110361057.4A CN202110361057A CN113047464A CN 113047464 A CN113047464 A CN 113047464A CN 202110361057 A CN202110361057 A CN 202110361057A CN 113047464 A CN113047464 A CN 113047464A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/14—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against other dangerous influences, e.g. tornadoes, floods
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- Architecture (AREA)
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- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention provides a passive sweeping jet device for inhibiting wind-induced vibration of a large building structure, which comprises a shell with openings at two ends and a hollow interior, wherein the interior of the shell is divided into an incoming flow introducing section, a tightening section, a vortex generating section and a jet flow ejecting section, and all the sections are connected in sequence; the incoming flow enters from the inlet of the incoming flow guide-in section, and the structure of the incoming flow guide-in section is a passage with a larger diameter; the tightening section is a passage with a diameter suddenly changed from a large diameter to a small diameter; the vortex generation section is a smooth arc-shaped inner wall, the tail end of the vortex generation section is provided with an annular arc-shaped bulge outwards, fluid flows tightly attached to the inner wall of the vortex generation section to form a channel, and tiny backflow is formed at the annular arc-shaped bulge to form a vortex; the jet flow ejection section is shaped like a horn, the area of the cross section of the outlet is gradually increased, and the vortex is ejected. The passive oscillating jet device has obvious vibration reduction effect, does not need external energy supply, and can well inhibit wind-induced vibration of a large-scale structure.
Description
Technical Field
The invention relates to the field of wind-induced vibration control of large building structures, in particular to a passive sweeping jet device for inhibiting wind-induced vibration of a large building structure.
Background
The existing large building structures, such as high-rise buildings, bridge towers and the like, belong to square column structures, and along with the increase of the height of the square column structures, the structures are more soft and slender, and the sensitivity is increased, so that the wind-induced vibration borne by the structures has larger and larger interference on the structures. In other large building structures, such as the bridge girder, the bridge girder becomes more slender and soft with the increase of the span of the bridge girder, and the sensitivity of the bridge girder increases, so that the wind-induced vibration of the bridge girder is more and more complicated. When incoming wind flows near the square column structure, vortex-induced vibration is easy to occur in the structure, vortex shedding alternately is generated in the wake flow of the structure, and some vortices act on the structure to cause structural vibration problems such as fluid-solid coupling and the like, so that the structure is interfered, and the structure is subjected to fatigue damage under long-term action to influence the use safety of the structure. One of the most important concerns of researchers is how to reduce wind-induced vibration. The existing active control method is to inject energy through the outside, and the cost is high.
Disclosure of Invention
Based on the defects, the invention aims to provide a passive sweeping jet device for inhibiting wind-induced vibration of a large building structure, which can reduce the wind-induced vibration of the large building and does not need external energy.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a passive sweeping jet device for inhibiting wind-induced vibration of a large building structure comprises a shell with openings at two ends and a hollow interior, wherein the interior of the shell is divided into an incoming flow introduction section, a tightening section, a vortex generation section and a jet ejection section which are sequentially connected; the incoming flow enters from the inlet of the incoming flow guide-in section, and the structure of the incoming flow guide-in section is a passage with a larger diameter; the tightening section is a passage with a diameter suddenly changed from a large diameter to a small diameter; the vortex generation section is a smooth arc-shaped inner wall, the tail end of the vortex generation section is provided with an annular arc-shaped bulge outwards, and fluid flows tightly attached to the inner wall of the vortex generation section to form a channel based on the coanda effect, so that tiny backflow is formed at the annular arc-shaped bulge to form a vortex; the jet flow ejection section is shaped like a horn, the area of the cross section of the outlet is gradually increased, and the vortex is ejected.
The invention also has the following technical characteristics:
furthermore, the cross section of the inlet of the incoming flow guide-in section is square.
Furthermore, the openings at the two ends of the shell are provided with control doors, when the sweeping jet device is needed, the control doors at the two ends are opened, wind inflow enters from the inlet, and finally the wind inflow is sprayed out from the outlet.
Furthermore, a plurality of passive sweeping jet devices are arranged on the large building structure in parallel at certain intervals and penetrate through the large building structure, the sweeping jet is formed spontaneously by depending on the pressure of incoming wind, the ejected high-speed sweeping airflow breaks up periodic vortex shedding in the wake flow, the unsteady acting force of the vortex on the structure is reduced, and the wind-induced vibration of the structure is further inhibited.
Further, the method for setting the number n of the passive sweeping jet devices on the large building structure is as follows,
wherein A isrAnd AcThe areas of an inlet and an outlet of the passive sweeping jet device are respectively, H is the central height of the large building structure, L is the span length of the large building structure, J is a dimensionless sweeping jet momentum coefficient, and n is the number of the passive sweeping jet devices; and (3) evaluating a dimensionless suction momentum coefficient J according to the air flow capacity sucked by the large building structure, and further obtaining the number n of the sweeping jet devices according to the requirement.
The invention has the advantages and beneficial effects that: the passive sweeping jet device disclosed by the invention spontaneously forms sweeping jet by depending on the pressure of incoming wind, has an obvious vibration reduction effect, does not need external energy supply, can well inhibit wind-induced vibration of a large-scale structure, and has the advantages of simple structure, low cost and convenience in maintenance.
Drawings
Fig. 1 is a schematic structural view of a passive sweeping jet device for suppressing wind-induced vibration of a girder of a long-span bridge according to embodiment 1 of the present invention.
Fig. 2 is a schematic cross-sectional view of an operating principle of a passive sweeping jet device for suppressing wind-induced vibration of a girder of a long-span bridge according to embodiment 1 of the present invention.
Fig. 3 is a schematic cross-sectional view of a sweeping jet device located inside a girder of a bridge according to embodiment 1 of the present invention.
FIG. 4 is a transient flow field diagram under uncontrolled conditions according to example 1 of the present invention.
FIG. 5 is a time-averaged flow field diagram under an uncontrolled condition according to example 1 of the present invention.
Fig. 6 is a view of a transient flow field with a passive swinger jet device installed according to example 1 of the present invention.
Fig. 7 is a time-averaged flow field diagram under the condition of installing the passive sloshing jet device according to the embodiment 1 of the invention.
FIG. 8 is a schematic structural diagram of a passive oscillating fluidic device for suppressing wind-induced vibration of a square columnar structure according to embodiment 2 of the present invention;
FIG. 9 is a schematic diagram of the working principle of a passive oscillating fluidic device for suppressing the wind-induced vibration of the square column structure according to embodiment 2 of the present invention;
fig. 10 is a schematic cross-sectional view of the working principle of the passive oscillating jet device for suppressing the wind-induced vibration of the square columnar structure according to embodiment 2 of the present invention.
Detailed Description
The invention will be further illustrated by way of example with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-3, a passive sweeping jet device for inhibiting wind-induced vibration of a large-span bridge girder is provided with a plurality of sweeping jet devices inside the bridge girder, each sweeping jet device comprises a shell with two open ends and a hollow interior, the interior of the shell is divided into an incoming flow introduction section 1, a tightening section 2, a vortex generation section 3 and a jet ejection section 4, and the sections are sequentially connected; the incoming flow enters from the inlet of the incoming flow guide-in section 1, and the structure of the incoming flow guide-in section is a passage with a larger diameter; the tightening section 2 is a passage with a diameter suddenly changed from a large diameter to a small diameter; the vortex generation section 3 is a smooth arc-shaped inner wall, the tail end of the vortex generation section is provided with an annular arc-shaped bulge 5 outwards, fluid flows tightly attached to the inner wall of the vortex generation section 4 to form a channel, and tiny backflow is formed at the annular arc-shaped bulge 5 to form a vortex; the jet flow ejection section 4 is horn-shaped, the area of the cross section of the outlet is gradually increased, and the vortex is ejected. The ejected high-speed sweeping airflow breaks up periodic vortex shedding in the wake flow, the unsteady aerodynamic force of the vortex on the structure is reduced, and wind-induced vibration of the structure is restrained. The cross section of the inlet of the incoming flow guide-in section 1 is square.
As shown in fig. 2, the oscillating jet devices are arranged at intervals along the span direction of the main beam of the bridge, the openings at the two ends of each oscillating jet device are provided with control doors which can be controlled by switches, when the oscillating jet device is needed, the control doors can be opened, incoming flow flows through the oscillating jet device from the inlet and is sprayed out from the outlet, when the oscillating jet device is not needed, the control doors can be closed, and the main beam of the bridge is the same as a common uncontrolled bridge.
With reference to fig. 2 and 3, a method of setting the number n of passive tickle jets on a large building structure is as follows,
wherein A isrAnd AcThe areas of an inlet and an outlet of the passive sweeping jet device are respectively, H is the central height of the large building structure, L is the span length of the large building structure,j is the momentum coefficient of the dimensionless sweeping jet flow, and n is the number of the passive sweeping jet flow devices; and (3) evaluating a dimensionless suction momentum coefficient J according to the air flow capacity sucked by the large building structure, and further obtaining the number n of the sweeping jet devices according to the requirement.
Fig. 4 and 5 measure the flow field around the experimental model with a Particle Image Velocimetry (PIV) to facilitate analysis of the flow characteristics. Fig. 4 and 5 show the instantaneous and time-averaged flow structure around the uncontrolled main beam model, respectively. Transient measurements clearly show that both outer surfaces of the main beam model shed two asymmetric counter-rotating vortex structures and vortices appear in the flow structure behind the main beam model. Fig. 5 shows that the Turbulent Kinetic Energy (TKE) values for time-averaged flow are very high and the physical parameter TKE was used in the study to evaluate the effectiveness of the self-jet flow.
Fig. 6 and 7 show the instantaneous and time-averaged flow structure around the rear main beam model with the passive sweeping jet device installed, respectively. As shown in fig. 6, transient measurements show that the wake flow field after the passive oscillating jet device is installed can almost completely eliminate alternately shedding vortexes in the model, instead of the pair of asymmetric vortex structures, two vortex streets with opposite signs are observed in the wake flow structure behind the main beam model. The Turbulent Kinetic Energy (TKE) values for time-averaged flows are low as shown in fig. 7, and the passive sweeping jet devices effectively modify the aerodynamic forces acting on them. Therefore, the high-speed oscillating jet flow ejected from the outlet breaks up alternate vortex shedding in the wake flow, the vortex mode is changed, the energy of the vortex structure is consumed, the unsteady aerodynamic force on the structure is reduced, and the wind-induced vibration of the structure is restrained.
Example 2
As shown in fig. 8, a passive sweeping jet device for suppressing wind-induced vibration of a square column structure has a structure similar to that of embodiment 1, and the number and the spacing of the sweeping jets are determined according to the size of the square column and the flow field characteristics around the square column when in use. Fig. 9 is a schematic diagram of the working principle of the oscillating jet device according to the embodiment of the invention. Fig. 10 is a schematic cross-sectional view of the sweep jet device of the present embodiment located inside a square columnar structure. With reference to fig. 9 and 10, the principle of controlling the wind-induced vibration of the square column structure by the distributed oscillating jet device is as follows: the incoming flow enters the interior of the oscillating jet device through the inlet and is ejected out of the outlet under the action of the oscillating jet device. The ejected high-speed sweeping airflow breaks up periodic vortex shedding in the wake flow, the unsteady acting force of the vortex on the structure is reduced, and wind-induced vibration of the structure is restrained.
Claims (5)
1. A passive sweeping jet device for inhibiting wind-induced vibration of a large building structure comprises a shell with openings at two ends and a hollow interior, and is characterized in that the interior of the shell is divided into an incoming flow leading-in section, a tightening section, a vortex generating section and a jet flow ejecting section, and all the sections are connected in sequence; the incoming flow enters from the inlet of the incoming flow guide-in section, and the structure of the incoming flow guide-in section is a passage with a larger diameter; the tightening section is a passage with a diameter suddenly changed from a large diameter to a small diameter; the vortex generation section is a smooth arc-shaped inner wall, the tail end of the vortex generation section is provided with an annular arc-shaped bulge outwards, fluid flows tightly attached to the inner wall of the vortex generation section to form a channel, and tiny backflow is formed at the annular arc-shaped bulge to form a vortex; the jet flow ejection section is shaped like a horn, the area of the cross section of the outlet is gradually increased, and the vortex is ejected.
2. The passive sloshing jet device for inhibiting wind-induced vibration of a large building according to claim 1, wherein: the cross section of the inlet of the incoming flow guide-in section is square.
3. A passive sloshing fluidic device for inhibiting wind-induced vibration of a large building according to any one of claims 1 or 2, wherein: the two-end opening of the shell is provided with control doors, when the sweeping jet device is needed, the control doors at the two ends are opened, wind comes in from the inlet, and finally is ejected from the outlet.
4. A passive sloshing fluidic device for inhibiting wind induced vibration of a large building structure according to claim 3, wherein: a plurality of passive sweeping jet devices are arranged on a large building structure in parallel at certain intervals in a penetrating mode, sweeping jet flow is formed spontaneously by means of incoming wind pressure, and the ejected high-speed sweeping air flow breaks up periodic vortex shedding in wake flow, so that unsteady acting force of the vortex on the structure is reduced, and wind-induced vibration of the structure is restrained.
5. A passive sloshing jet device for inhibiting wind induced vibration of a large building structure according to claim 4, wherein: the method of setting the number n of passive sweeping jet devices on a large building structure is as follows,
wherein A isrAnd AcThe areas of an inlet and an outlet of the passive sweeping jet device are respectively, H is the central height of the large building structure, L is the span length of the large building structure, J is a dimensionless sweeping jet momentum coefficient, and n is the number of the passive sweeping jet devices; and (3) evaluating a dimensionless suction momentum coefficient J according to the air flow capacity sucked by the large building structure, and further obtaining the number n of the sweeping jet devices according to the requirement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110361057.4A CN113047464A (en) | 2021-04-02 | 2021-04-02 | Passive sweeping jet device for inhibiting wind-induced vibration of large building structure |
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| CN202110361057.4A CN113047464A (en) | 2021-04-02 | 2021-04-02 | Passive sweeping jet device for inhibiting wind-induced vibration of large building structure |
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2021
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