阅读说明：本技术 一种抑制圆柱绕流旋涡脱落的偏心轴承行波壁驱动装置 (Eccentric bearing traveling wave wall driving device for inhibiting cylindrical streaming vortex shedding ) 是由 徐枫 张立启 王立勇 段忠东 欧进萍 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种抑制圆柱绕流旋涡脱落的偏心轴承行波壁驱动装置,包括插柱、偏心轴承、移动杆、支撑板、柔性面层和系杆；所述插柱转动连接在支撑板的内侧,所述偏心轴承呈螺旋式固定连接在插柱上,所述移动杆的一端固定连接在偏心轴承的外侧壁上,所述移动杆的另一端固定连接在系杆上,所述系杆远离移动杆的一端朝向柔性面层设置,本发明柔性面层运动可以在壁面形成“滚动轴承”效应,从而抑制了旋涡脱落,并降低了作用在圆柱表面的气动力。(The invention discloses an eccentric bearing traveling wave wall driving device for inhibiting vortex shedding of cylindrical streaming, which comprises an insert column, an eccentric bearing, a movable rod, a support plate, a flexible surface layer and a tie rod, wherein the insert column is fixedly connected with the eccentric bearing; the plug post is rotatably connected to the inner side of the supporting plate, the eccentric bearing is fixedly connected to the plug post in a spiral mode, one end of the moving rod is fixedly connected to the outer side wall of the eccentric bearing, the other end of the moving rod is fixedly connected to the tie rod, and one end, far away from the moving rod, of the tie rod faces the flexible surface layer.)

1. The travelling wave wall driving device of the eccentric bearing for inhibiting the vortex shedding of the cylindrical streaming is characterized by comprising an insert column (1), an eccentric bearing (2), a moving rod (3), a supporting plate (4), a flexible surface layer (5) and a tie rod (6);

The inserting column is characterized in that the inserting column (1) is rotatably connected to the inner side of the supporting plate (4), the eccentric bearing (2) is fixedly connected to the inserting column (1) in a spiral mode, one end of the moving rod (3) is fixedly connected to the outer side wall of the eccentric bearing (2), the other end of the moving rod (3) is fixedly connected to the tie rod (6), and one end, far away from the moving rod (3), of the tie rod (6) is arranged towards the flexible surface layer (5).

2. The eccentric bearing traveling wave wall driving device for suppressing vortex shedding of the cylindrical streaming according to claim 1, wherein the cross section of the inserted column (1) is an N-sided polygon, and N is an integral multiple of 4.

3. The apparatus for driving the traveling wave wall of an eccentric bearing for suppressing the vortex shedding of a cylindrical swirling flow according to claim 1, wherein the number of the eccentric bearings (2) is plural, and the eccentric bearings (2) are arranged in a spiral form on the insert column.

4. The device for driving the traveling wave wall of the eccentric bearing for inhibiting the vortex shedding of the cylindrical circumfluence according to the claim 2, characterized in that the included angle between the symmetrical lines of the adjacent eccentric bearings (2) is integral multiple of pi/2.

5. The apparatus according to claim 1, wherein the flexible surface layer (5) is made of a soft material.

6. The apparatus for driving a traveling wave wall of an eccentric bearing for suppressing vortex shedding of a cylindrical circumferential flow according to claim 1, wherein the support plate (4) has a semi-cylindrical shape.

Technical Field

The invention relates to an eccentric bearing travelling wave wall driving device, in particular to an eccentric bearing travelling wave wall driving device for inhibiting vortex shedding of cylindrical streaming.

background

The problem of cylindrical streaming under high Reynolds number is an unsteady flow problem, and the flow mechanism is relatively complex. With the research of people on the problem of cylindrical streaming, the vortex which falls off regularly and alternately appears on the two sides of the cylinder under certain conditions, which is a famous karman vortex street phenomenon.

The vortex that the cylinder wake drops in turn produces the aerodynamic force that can produce the pulsation, leads to the cylinder to take place the great amplitude vibration of crosswind direction, is the vortex induced vibration promptly. The problem of vortex induced vibration induced engineering is also numerous and most typically occurs in the wake region of a few hundred meter tall cooling towers in Bridgkin's power plants in the United kingdom collapsing in resonance. In this series of accidents, we continuously took lessons to find a method for flow control. In the process, a mode of evolution of disturbance in a certain region along with time and space is proposed, and active control of the wall of the cylindrical circumfluence wave is developed on the basis of the idea. The bionic control method for the wall of the cylindrical circumfluence wave finds that the flow control effect is good in two-dimensional numerical simulation, the vortex shedding of the tail can be basically and completely eliminated, the resistance coefficient can be reduced, and the control mechanism research of the method on a two-dimensional plane has some achievements. The wave wall is originally derived from fish, a series of wave-shaped bulges are formed on the skin surface of the dolphin when the dolphin swims at a high speed, and the dolphin moves downstream along the direction of the flow speed, which is found from pictures taken by Herte l in 1996, engineers think that the wave-shaped traveling wave is very beneficial to the underwater high-speed swimming of the dolphin, and the flexible wall surface is introduced into the engineering field and is used for wake flow control of blunt bodies such as cylinders or square columns.

The traveling wave wall is a novel bionic flow control method, and at present, few traveling wave wall control devices of cylindrical streaming can realize reciprocating motion of traveling waves.

Disclosure of Invention

The present invention is directed to provide an eccentric bearing traveling wave wall driving device that suppresses vortex shedding of a cylindrical swirling flow, so as to solve the problems of the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme:

An eccentric bearing traveling wave wall driving device for inhibiting vortex shedding of cylindrical streaming comprises an insert column, an eccentric bearing, a movable rod, a support plate, a flexible surface layer and a tie rod;

The inserting column is rotatably connected to the inner side of the supporting plate, the eccentric bearing is fixedly connected to the inserting column in a spiral mode, one end of the moving rod is fixedly connected to the outer side wall of the eccentric bearing, the other end of the moving rod is fixedly connected to the tie rod, and one end, far away from the moving rod, of the tie rod is arranged towards the flexible surface layer.

As a further scheme of the invention: the cross section of the inserted column is N-edge, and N must be an integral multiple of 4.

As a further scheme of the invention: the eccentric bearing is a plurality of, the eccentric bearing is arranged on inserting the post in the form of spiral.

As a further scheme of the invention: and the included angle between the symmetrical lines of the adjacent eccentric bearings is integral multiple of pi/2.

As a further scheme of the invention: the flexible surface layer is made of soft materials.

As a further scheme of the invention: the support plate is semi-cylindrical.

compared with the prior art, the invention has the beneficial effects that: the invention relates to an eccentric bearing traveling wave wall driving device for inhibiting vortex shedding of cylindrical streaming, which comprises a plurality of eccentric bearings spirally arranged on an inserted column according to one direction, a plurality of moving rods with the same length are symmetrically arranged on the eccentric bearings in a V shape and do reciprocating motion so as to push a flexible surface layer to move, and the flexible surface layer on the surface of a cylinder can form a rolling bearing effect on the wall surface, so that the vortex shedding is inhibited, and the aerodynamic force acting on the surface of the cylinder is reduced.

Drawings

FIG. 1 is a perspective view of an eccentric bearing traveling wave wall drive device for suppressing vortex shedding of a cylindrical streaming;

FIG. 2 is a side view of an eccentric bearing traveling wave wall drive for suppressing vortex shedding of a cylindrical streaming vortex;

FIG. 3 is a schematic diagram of an eccentric bearing in an eccentric bearing traveling wave wall driving device for suppressing vortex shedding of a cylindrical streaming;

In the figure: 1. inserting a column; 2. an eccentric bearing; 3. a travel bar; 4. a support plate; 5. a flexible facing; 6. a tie bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

referring to fig. 1-3, in an embodiment of the present invention, an eccentric bearing traveling wave wall driving apparatus for suppressing vortex shedding of a cylindrical streaming includes an insert column 1, an eccentric bearing 2, a movable rod 3, a supporting plate 4, a flexible surface layer 5 and a tie bar 6;

Insert post 1 and rotate to be connected in the inboard of backup pad 4, and eccentric bearing 2 is spiral fixed connection and inserts on post 1, and the one end fixed connection of carriage release lever 3 is on eccentric bearing 2's lateral wall, and the other end fixed connection of carriage release lever 3 is on tie rod 6, and tie rod 6 keeps away from the one end of carriage release lever 3 and sets up towards flexible surface course 5.

Eccentric bearing 2 is inserting spiral arrangement on post 1, wherein the rotation center of eccentric bearing 2 coincides with the rotation center of inserting post 1, the one end fixed connection of carriage release lever 3 is on eccentric bearing 2's lateral wall, carriage release lever 3 is not along with eccentric bearing's rotation, but at fixed position reciprocating motion, it is provided by external motor to insert post 1 rotation, along with the rotation of inserting post 2 drives eccentric bearing 1 and carriage release lever 3 motion, thereby promote flexible surface course 5 and forming the travelling wave motion, it is the fluctuation frequency of travelling wave promptly to insert post 2 rotational speed.

The cross section of the inserted column 1 is N-edge, and N must be an integral multiple of 4.

The eccentric bearings 2 are multiple, and the eccentric bearings 2 are arranged on the inserted column in a spiral mode.

The included angle between the symmetrical lines of the adjacent eccentric bearings 2 is integral multiple of pi/2.

The flexible surface layer 5 is made of soft materials.

The support plate 4 is semi-cylindrical.

four representative positions of a sine traveling wave are constructed by every four adjacent eccentric bearings 2 of the device, the representative positions are two balance positions, wave crests and wave troughs respectively, the phase difference between the adjacent eccentric bearings 2 is pi/2, the traveling wave amplitude is controlled by the distance delta R between the rotation center of the eccentric bearings 2 and the geometric center of the bearings, and the distance between a point on the wall surface of the traveling wave and the rotation center is controlled by a function (1) along with the time change.

Wherein is the radius of the R cylinder, omega is the angular velocity of the inserted column,The point forms an included angle with the positive x half shaft by the connecting line of the circle center.

The moving rods 3 used by the device are all uniform in length and are determined by R-R, R is the radius of the outer circle of the eccentric bearing 2, and the eccentric bearing 2 is spirally arranged on the inserted column 1; the moving rods 3 are symmetrically arranged in a V shape on the eccentric bearing 2, and the included angle between the adjacent moving rods 3 on one side is pi/32.

The invention relates to an eccentric bearing traveling wave wall driving device for inhibiting vortex shedding of cylindrical streaming, which is characterized in that after a traveling wave wall is opened, the vortex shedding of a wake flow area is gradually inhibited along with the increase of the traveling wave motion speed, and when the wave speed is 1.5 times of the incoming flow wind speed, the edge of the wake flow area cannot generate a karman vortex street which alternately sheds, because a rolling bearing effect is generated on the wall surface in the traveling wave motion process, the boundary layer effect is eliminated, so that the vortex shedding of the cylindrical wake flow is effectively inhibited, the aerodynamic force borne by the cylindrical surface is eliminated, and the aim of inhibiting the cylindrical vortex-induced vibration is fulfilled.

After the traveling wave wall is started, a rolling bearing effect is formed near the wall surface, and the alternately falling vortex is inhibited, so that the formation of the karman vortex street in the wake zone is avoided.

the travelling wave wall motion effectively improves aerodynamic force borne by the surface of the cylinder, and is mainly embodied in two aspects, namely, the pulsation amplitude of the lifting force coefficient of the transverse wind direction of the cylinder is reduced, and the mean value of the resistance coefficient acting on the surface of the cylinder is reduced.

The invention relates to an eccentric bearing traveling wave wall driving device for inhibiting vortex shedding of cylindrical streaming, which comprises a plurality of eccentric bearings 2 spirally arranged on an inserted column 1 according to one direction, and a plurality of moving rods 3 with the same length are symmetrically arranged on the eccentric bearings 2 in a V shape to reciprocate so as to push a flexible surface layer to move.

The flexible surface layer movement of the cylindrical surface can form a rolling bearing effect on the wall surface, so that vortex shedding is inhibited, and the aerodynamic force acting on the cylindrical surface is reduced.

the term "fixedly connected" as used in the present invention means that two parts connected to each other are fixed together, typically by welding or screwing; "rotationally coupled" means that two components are coupled together and capable of relative motion.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.