WO2019071446A1

WO2019071446A1 - Device combining eddy current generation and wave absorption

Info

Publication number: WO2019071446A1
Application number: PCT/CN2017/105595
Authority: WO
Inventors: 宋行智
Original assignee: 宋行智
Priority date: 2017-10-11
Filing date: 2017-10-11
Publication date: 2019-04-18

Abstract

A device for generating an eddy current, used in a fluid flow field, wherein the device (10A, 10B, 10C, 10D, 10E) is provided with an input (12), an output (14), an input plane (A) and an input axis (X), the input (12) and output (14) respectively corresponding to the upstream end and downstream end of a fluid. The input plane (A) is the plane of forward flow of an ideal fluid into the input (12). The input axis (X) is perpendicular to the input plane (A). The device (10A, 10B, 10C, 10D, 10E) is provided with one or more warped blades (20) that are each provided with a front end (21), a rear end (22), a windward face (23) oriented toward the fluid, and a leeward face (24) oriented away from the fluid. The windward faces (23) of the blades (20) form a non-zero angle of attack (θ) with the input axis (X). At least one leading edge (26) is formed on the front end (21) of each blade (20), and the leading edges (26) form a leading-edge sweep angle (α) with the input plane (A) of not less than 45 degrees. The rear end (22) of each blade (22) is provided with a trailing edge (28). The above structure makes it possible to control the properties of a fluid flowing through the device (10A, 10B, 10C, 10D, 10E) and to attenuate the effect of pressure waves on the fluid.

Description

Composite composite eddy current generation wave-eliminating device

Technical field

The present invention relates to the design of the flow field of a fluid, and more particularly to a composite composite eddy current generating wave eliminator that controls fluid flow characteristics.

Background technique

In order to allow the fluid to flow smoothly, the fluid can be vortexed to enhance the fluid flow, and in order to generate eddy currents, the most common way is to install a vortex generating device. A known vortex generating device has a plurality of fixed vanes through which eddy currents can be generated as the fluid passes through the vanes.

However, the above-described vortex generating device has a simple structure, and when the flow velocity of the fluid is fast, the blades of the vortex generating device block the flow of the fluid. When the flow velocity of the fluid is low, the eddy current generated by the vortex generating device is of poor quality and cannot even generate eddy currents. Therefore, the known vortex generating device has a narrow application range, and when the flow rate of the fluid is too high or too low, it cannot operate effectively.

Another type of vortex generating device is known to use a fluid to drive the blades of the vortex generating device to rotate to generate eddy currents. However, the rotation of the blades generates rotational inertia. When the flow velocity of the fluid changes, the blades of the eddy current generating device cannot be rotated due to their rotational inertia. The rotational speed is immediately changed with the flow rate of the fluid, causing delay and eddy current wear. Furthermore, the design of the rotating blade, in addition to the complicated structure, the rotating mechanism of the blade is easy to wear and deteriorate its performance after long-term use, and the rotation mechanism of the blade needs to be maintained and lubricated, so as not only the destruction of the eddy current generating device is improved. Risk also increases the cost of maintenance.

In addition, existing eddy current generating devices do not provide vortices of appropriate characteristics, and there is no good processing mechanism for pressure waves in the flow field.

Summary of the invention

The main object of the present invention is to provide a composite composite eddy current generating wave-eliminating device which can generate a main eddy current and a secondary eddy current, and can effectively control the flow characteristics of the fluid at different flow rates.

Another object of the present invention is to provide a composite composite eddy current generating wave canceling device which can reduce the pressure wave reversed from the flow field to reduce the influence of the pressure wave on the front flow field of the wave eliminator.

The composite composite eddy current generating wave-eliminating device provided by the invention is used in a fluid flow field, the device has: an inlet end, an outlet end, an inlet end plane and an inlet end axis, the inlet end And the outlet end respectively corresponding to the upstream end and the downstream end of the fluid; the inlet end plane is defined as a plane formed by the ideal fluid flowing positively into the inlet end; the inlet end axis is located at the inlet end, perpendicular to the inlet end plane;

The device contains:

At least one blade having a twisted shape, a front end, a rear end, and a windward surface facing the fluid; at least one angle of attack formed between the windward surface and the axis, the angle of the angle of attack is not zero;

The front end of each of the blades forms at least one oblique leading edge toward the upstream end of the fluid, and a leading edge sweep angle is formed between the leading edge and the entrance end plane, and the leading edge sweep angle is not less than 45 degrees. The rear end of each of the blades has a trailing edge facing the downstream end of the fluid.

The invention can generate an appropriate characteristic vortex by the angle of attack of the blade of the device, the sweeping angle of the leading edge and the design and cooperation of the trailing edge, and the angle of attack of the blade changes the fluid vector, so that the fluid forms a main eddy current on the windward side of the blade. A portion of the fluid flows from the windward surface of the blade over the leading edge to the leeward surface of the blade to form a secondary vortex, and the primary and secondary vortices form a composite vortex. The leading edge sweep angle of the leading edge of the blade is used to vary the characteristics of the secondary eddy with the flow rate of the fluid and to change the flow characteristics of the primary vortex through the secondary vortex to achieve the desired eddy current characteristics. The rear end of the vortex device defines an exit end plane; a trailing edge sweep angle is formed between the trailing edge of the vane and the exit end plane, the trailing edge controlling the eddy current vector characteristic of the device.

The twisted design of the blade makes the windward mask a curved surface, so that the reflected wave of the forward pressure wave of the fluid is not fixed, and is different from the flow direction, so as to break up the pressure wave and reduce the back pressure. The larger the area of the blade and the longer the twist length, the lower the air permeability of the device from the inlet end to the outlet end (ie, the higher the shielding rate of the blade in the device), the better the ability to block and break the pressure wave.

The twisted shape of the blade causes the reflected wave of the forward pressure wave, whereby the eddy current device is fixed, so that the pressure wave encountered by the vortex device can be dissipated, the pressure wave is reflected and scattered, and the energy of the pressure wave is reduced. In order to reduce the interference of fluid flow, and through the angle of attack and sweep angle of each blade, the primary and secondary eddy currents formed by the fluid increase the kinetic energy of the fluid flow, so that the fluid can pass through the transition point of the pipeline more easily. And reduce the influence of the change of the direction of travel on its flow efficiency, and improve the fluid flow effect.

When the vortex device has a plurality of blades, the blades are arranged in a ring shape, and the blades are symmetrically or asymmetrically arranged depending on the eddy current characteristics to be generated.

The angle of attack formed between the different positions of the blades and the direction of fluid flow may vary depending on the particular needs of the vortex to be produced.

When the vortex device has a plurality of blades, the angle of attack of each blade may differ depending on the eddy current characteristics required.

The angles of the leading edge sweep angle and the trailing edge sweep angle of each blade are not necessarily the same.

When the leading edge or the trailing edge of each blade is not a straight edge, for example, an arc edge, the angle of the leading edge sweep angle is the average value of the sweep angle of the leading edge; similarly, after the trailing edge The sweep angle is the average of the sweep angles around the trailing edge.

The blades are twisted in a clockwise direction or twisted in a spiral shape, and each body of the blade has one or more torsional curvatures.

The shape of the trailing edge of each blade and the trailing edge sweep angle cooperate with the distortion of the blade to control the eddy current vector characteristics of the downstream end of the vortex device.

A plurality of blades arranged in a ring shape may have an outwardly flared or retracted configuration at the front end to cause the fluid to form an external vortex or a vortex.

The device may include a hollow peripheral portion; the blade is disposed in the peripheral portion and covered by the peripheral portion. The front and/or outer ends of the blade may expose the peripheral device such that the leading, trailing and trailing edges of the blade direct fluid.

The apparatus can include a central portion between a plurality of annularly arranged vanes having a longitudinal passageway for the fluid to form a first-order bundle.

The composite eddy current generating wave-eliminating device can be used singly or in combination for multiple applications.

DRAWINGS

Fig. 1 is a front perspective view showing a composite eddy current generating wave canceling device (hereinafter referred to as a vortex device) according to a first embodiment of the present invention.

Figure 2 is a front elevational view of the vortex device of Figure 1.

Figure 3 is a side elevational view of the vortex device of Figure 1.

4 is a view showing an example of use of the vortex device of FIG. 1.

Fig. 5 is another use example of the vortex device of Fig. 1.

Figure 6 is a perspective view of a vortex device according to a second embodiment of the present invention.

Figure 7 is a side elevational view of the vortex device of Figure 6.

Fig. 8 is a view showing an example of use of the vortex device of Fig. 6.

9 to 10 show a state in which a fluid flows in the vortex device, wherein: Fig. 9 is a front view of the vortex device, and Fig. 10 is a perspective view.

11 to 13 are respectively a perspective view, a side view, and a front view of a vortex device according to a third embodiment of the present invention, and showing a flow state of the fluid.

14 and 15 are respectively a perspective view and a front view of a fourth embodiment of the present invention, and showing the flow state of the fluid.

Figure 16 is a longitudinal sectional view of the vortex device of the fourth embodiment, and is shown mounted in a pipe.

17 and 18 are a front perspective view and a rear perspective view of a vortex device according to a fifth embodiment of the present invention.

19 and 20 are a front view and a back view of the vortex device of the fifth embodiment.

Figure 21 is a side view of the vortex device of the fifth embodiment.

Figure 22 shows an example of use of any of the embodiments of the present invention.

Reference numeral

10A, 10B, 10C, 10D, 10E: composite composite eddy current generation wave-eliminating device; 12: inlet end; 14: end; 20: blade; 21: front end; 22: rear end; 23: windward side; 24: leeward Face; 25: ear; 26: leading edge; 261: root; 262: tail; 27: outer edge; 28: trailing edge; 281: root; 282: tail; 29: medial edge; 30: tube; Channel; 40: peripheral part; 60: fluid line; 62: turning point; A: entrance plane; B: exit plane; X: entrance axis; Y: exit axis; θ: angle of attack; Edge sweep angle; β: trailing edge sweep angle; V: main eddy current; M: secondary eddy current; S: lateral flow field fluid; P: rear end outlet; D: blade width

heart.

Detailed ways

In order to further understand the objects, features and advantages of the present invention, several embodiments of the present invention are described in the following.

The invention provides a composite composite eddy current generating wave-eliminating device (hereinafter referred to as a vortex device), which comprises: an inlet end, an outlet end and one or more blades. Each of the blades is twisted and has an angle of attack or a non-single angle of attack with the flow field vector before the vortex device. The leading edge of each blade is obliquely disposed to form at least one leading edge sweep angle. The twisted vanes cause a fluid flowing through the vortex device to form a main vortex, and the leading edge sweep angle of each vane causes the fluid to form a secondary vortex, and the primary and secondary vortices synthesize the composite vortex of the present invention. Several embodiments of the present invention are described below. The component symbol 10 is a general term for a vortex device, and the eddy current devices of the respective embodiments are denoted by element symbols such as 10A, 10B, and 10C.

1 to 3, a vortex device 10A according to a first embodiment of the present invention is constructed by a single blade 20. The vortex device 10A has an inlet end 12 and an outlet end 14 at opposite ends of the device, respectively corresponding to the upstream end and the downstream end of the fluid, that is, fluid flows from the inlet end 12 into the device, and the venting device 10 End 14 flows out. An inlet plane A is defined as a plane in which the ideal fluid flows in a forward direction, positively contacting the inlet end 12 of the vortex device 10A; and an outlet plane B, defined as an ideal fluid flowing forwardly from the outlet end of the vortex device 14 The plane formed. In practical applications, depending on the environment of use, such as in an open space or in a design for a nozzle, the fluid will flow into the vortex device at different angles in the forward or oblique direction, and in order to clarify the plane of the entrance, The inlet plane A defined by the description of the present invention and the scope of the patent application is based on the plane of the ideal fluid flowing forward into the inlet end 12 of the vortex device; and the outlet plane B is defined as the outlet of the vortex device in the forward direction of the ideal fluid. 14 is the benchmark. An inlet axis X is located at the inlet end 12, perpendicular to the inlet end plane A, and the inlet axis X is flat The forward flow direction of the upstream end of the ideal fluid; an exit axis Y at the exit end 14 perpendicular to the exit end plane B. The vortex device 10 of the present invention may be disposed in a straight line or in a curved manner at different ends 12, 14 depending on the application, and the inlet axis X and the exit axis Y may be parallel or non-parallel.

The blade 20 is spirally twisted from its front end 21 toward the rear end 22 (right spiral in this embodiment), and has two faces, respectively a windward face 23 and a leeward face 24, which is a facing fluid On the other hand, the leeward surface 24 is the surface of the blade facing away from the fluid. An angle of attack θ, as shown in FIG. 3, is formed between the windward surface 23 of the blade 20 and the inlet axis X, the angle of attack θ is not equal to zero degrees, that is, the windward surface 23 and the inlet axis X (and The forward flow direction with the ideal fluid has an angle not equal to zero. A notch is provided at the front end 21 of the blade 20 such that the front end of the blade forms two ears 25, and the inner edge of each of the ears 25 forms an inclined leading edge 26. The blade 20 of the present embodiment has four functional edges, namely the two leading edges 26 and the outer edges 27 on both sides of the blade, the leading edge 26 being the edge of the blade facing the upstream end of the fluid, and the inlet end The plane A forms a leading edge sweep angle α, as shown in Fig. 2, the leading edge sweep angle α is not less than 45 degrees. The present invention defines where each leading edge 26 is near the upstream end of the fluid as the root 261 of the leading edge, and where the leading edge 26 is near the downstream end of the fluid is defined as the trailing edge 262 of the leading edge. The leading edge 26 of the present embodiment is in the form of a forward sweep that is inclined from the outside toward the inside toward the tail 262. The trailing edge 28 of the blade 20 is a flush edge in this embodiment.

The vortex device of the present invention is installed in a fluid line to cause a fluid of the composite type to generate a vortex of a composite type and to reduce the influence of a pressure wave opposite to the direction of fluid flow on the fluid. 4 and 5 show two examples of use of the vortex device 10A, which are merely illustrative and not limiting. The vortex device 10A is fixed in the fluid line 60, and the blade 20 is fixed. 4, the vortex device 10A is completely installed in a fluid line 60, and its two outer edges 27 engage the inner wall surface of the fluid line 60. In the example of use of FIG. 5, only a portion of the vortex device 10A is located in the fluid line 60. The front end of the blade 20 is exposed to an open space, and the outer edge 27 of the ear portion 25 forms a free edge.

4, the upstream end of the fluid flows in from the inlet end 12 of the vortex device 10A and contacts the windward surface 23 of the blade 20. By the design of the angle of attack θ (Fig. 3), the windward surface 23 of the blade 20 changes the fluid vector such that the fluid forms a main vortex V that flows along the blade 20. A portion of the fluid is turned over the windward surface 23 of each of the ears 25 along each of the leading edges 26 to each of the leeward faces 24 to form a secondary vortex M, which is in the same direction as the primary vortex V.

The present invention causes the windward surface 23 of the blade 20 to form a high angle of attack with the flow direction of the fluid, allowing fluid to flow against the windward surface 23 to change and control the flow field of the fluid. The high angle of attack θ is designed to allow the fluid to flow against the blades at low speeds without separation from the blades. The large-angle leading edge sweep angle α reduces the resistance of the secondary vortex M from the windward surface 23 to the leeward surface 24, so that the flow velocity of the secondary eddy current is fast and the turbulence is reduced. The adhesion of the rising fluid to the leeward surface 24 reduces the viscosity of the fluid on the surface of the blade, and the secondary vortex M changes the characteristics of the primary vortex V with the flow velocity of the fluid, and can control the flow of each of the leeward faces 34A. The field allows the fluid to flow more closely to each of the leeward faces 34A.

The blade chord of the blade 20 (i.e., the length of the leading edge to the trailing edge of the blade) is long, extending from the inlet end 12 to the outlet end 14, and the fluid flowing into the vortex device is fully guided and controlled by the blade 20. The primary vortex V and the secondary vortex M form a composite vortex, wherein the leading edge sweep angle α of the blade is to generate a secondary eddy that changes characteristics as the fluid flow rate changes, and causes the secondary eddy to change the primary vortex V Fluid properties. The trailing edge 28 of the blade 20 is a straight edge and the downstream end of the control fluid is a straight vortex.

The invention changes the fluid into a composite vortex with better fluid kinetic energy and can smoothly flow through the turning point 62 of the fluid line 60, thereby reducing energy consumption.

The blade 20 of the present invention has a spiral curved surface, and the forward pressure wave at the upstream end of the fluid encounters the reflection vector of the blade is not a fixed direction, and the reflection vector is different from the flow field direction, thereby generating the effect of breaking up and reducing the pressure wave. Furthermore, the area of the blade 20 of the present embodiment is large, and the shielding rate of the blade 20 between the inlet end 12 and the outlet end 14 of the vortex device is extremely high, and the ability to withstand pressure waves is excellent. Therefore, the vortex device of the present invention can resist the pressure wave opposite to the flow field, reduce the influence of the reflected wave on the fluid before the wave eliminator, and maintain the fluid with good kinetic energy.

The state of use of the vortex device 10A in Fig. 5 can be understood from the use case of Fig. 4. In the use example of FIG. 5, the two ears 25 are exposed to the open space, and the fluid having the forward flow field and the lateral flow field flows toward the device 10A, and the outer edge 27 of the two ears 25 is in the open space. As a functional edge, the fluid S from the forward flow field and the secondary vortex can be introduced into the main eddy current to the center of the vortex device, and the generation of turbulence is reduced.

The following examples reveal that the vortex device is constructed of a plurality of blades. Referring to FIG. 6 and FIG. 7 , a vortex device 10B according to a second embodiment of the present invention includes: a plurality of blades 20 , a central portion, and a peripheral portion 40 . The inlet end 12 and the outlet end 14 of the vortex device correspond to the upstream and downstream ends of the fluid, respectively. The vortex device 10B has an inlet plane A and an exit plane B defined as a plane in which the ideal fluid flows positively into the inlet and a plane defined as the ideal fluid flowing out of the outlet. The inlet end and the outlet end respectively have an inlet end axis X and an exit end axis Y, respectively perpendicular to the inlet end plane A and the outlet end plane B; the inlet end axis X is parallel to the forward flow direction of the upstream end of the ideal fluid.

The central portion is located in the present embodiment as a tube 30 located at the center of the vortex device 10B, and a longitudinally extending passage 32 is formed therein for fluid communication. The peripheral portion 40 is an annular body in this embodiment, which constitutes the outermost periphery of the vortex device; the tubular body 30 is disposed concentrically with the peripheral portion.

The embodiment includes six blades 20 disposed annularly between the tube body 30 and the peripheral portion 40 and fixedly fixed. The front end 21 is fixed to the circumferential surface of the tube body 30, and the rear end is fixed. 22 solid It is connected to the inner peripheral surface of the peripheral portion 40. The vanes 20 are outwardly expanded from the inlet end 12 of the vortex device 10B to the lower end 14. Referring to Figure 9, the vanes 20 are twisted and twisted in the clockwise direction (e.g., clockwise) from the center of the vortex device to the rear end 22 of the vane. Each of the blades 20 has a windward face 23, a leeward face 24, an inclined leading edge 26 and a sloped trailing edge 28. The windward face 23 is the face of the blade facing the fluid, and the leeward face 24 is the face of the blade facing away from the fluid. Referring to FIG. 7, the windward surface 23 forms a non-zero angle of attack θ with the flow direction of the upstream end of the fluid (ie, the direction parallel to the axis X). The leading edge 26 is the edge of the blade towards the upstream end of the fluid and the trailing edge is the edge towards the downstream end of the fluid. The leading edge 26 and the trailing edge 28 each have a

root portion

261, 281 adjacent the upstream end of the fluid and a

tail portion

262, 282 adjacent the downstream end of the fluid. Each of the leading edges 26 forms a leading edge sweep angle α with the entrance end plane A, the angle of which is not less than 45 degrees. The leading edge 26 is a swept edge with its root 261 inclined from the inside to the outside toward the tail 262. Each of the trailing edge 28 and the exit plane B form a trailing edge sweep angle β, and the root portion 281 is also inclined from the inside toward the outside toward the tail portion 282.

The vanes 20 are arranged in a symmetrical or asymmetrical annular shape depending on the eddy current characteristics to be produced. The angle of attack θ of each blade 20 at different positions is not necessarily a single value, that is, an angle of attack of different angles of the blade may be formed as needed, such that between the windward face 23 and the flow field vector of each blade It is not a single angle of attack; different blades can also be made with different angles of attack depending on the eddy current characteristics to be produced. The leading edge 26 or trailing edge 28 of the blade 20 can be a straight edge or an arcuate edge. If the leading edge 26 and the trailing edge 28 have a curvature, the leading edge sweep angle α is defined as the average of the sweep angle of the position of the leading edge 26, not the angle of a single position; and the trailing edge sweep angle β It is then defined as the average of the sweep angles of the locations around the trailing edge 28. The leading edge sweep angles α of the different blades 20 may be the same or different; the trailing edge sweep angles β of the different blades may also be the same or different.

Referring to FIGS. 8-10, an example of use of the vortex device 10B in a fluid line 60 is shown. The upstream end of the fluid flows in from the inlet end 12 of the vortex device 10B and is guided by the windward face 23 of the blade 20. The windward faces 23 change the fluid vector such that the fluid forms a main vortex V that flows along the blades 20. At the same time, a portion of the fluid on the windward surface 23 is advanced along each leading edge 26 to the leeward surface 24 of each blade to form a secondary vortex M which is in the same direction as the primary vortex V.

The windward surface 23 of the blade 20 forms a high angle of attack with the flow of fluid, causing fluid to flow against the windward surface 23 to change and control the flow field of the fluid. The high angle of attack θ is designed to allow the fluid to flow against the blades at low speeds without separation from the blades. The large-angle leading edge sweep angle α reduces the resistance of the secondary vortex M from the windward surface 23 to the leeward surface 24 and reduces the occurrence of turbulence, so that the fluid can be applied to the leeward surface 24 to reduce the viscosity of the fluid on the blade surface. Sex. The secondary vortex M and the primary vortex V are combined to form a composite vortex, which can change the flow characteristics of the primary vortex according to the flow velocity of the fluid, and can control the flow field of each of the leeward faces 24. A portion of the fluid flows through the passage 32 of the tubular body 30 and forms a first-class bundle that can be guided The flow direction of the eddy current.

The vanes 20 are flared from the front end 21 toward the rear end 22, so that the fluid flows out of the vortex device 10B to form an external vortex. The shape of the trailing edge 28 of the blade and its sweep angle are used to control the eddy current vector characteristics at the downstream end to meet design requirements. The resulting composite vortex can smoothly flow through the transition 62 of the fluid line 60, reducing energy consumption.

In the technical means of the present invention, each blade is twisted, has a non-single angle of attack, and the leading edge of the blade is designed to have a sweep angle, which can control the flow field energy at different flow rates. The sweep angle design of the trailing edge of the blade controls the flow distribution at the exit of the vortex device.

The blade 20 of the vortex device 10B is curved and has different angles of attack at different positions. The forward pressure wave at the upstream end of the fluid encounters the reflected wave formed by the blade is not a fixed direction, and the reflection vector is different from the flow field direction. In order to produce the effect of breaking up and reducing pressure waves.

The blade chord of the blade 20 of the present embodiment (the length of the leading edge to the trailing edge of the blade) is short, and is more suitable for a fluid environment having a relatively high flow velocity.

Referring to FIG. 11 to FIG. 13 , a vortex device 10C according to a third embodiment of the present invention also includes a plurality of blades 20 , a central portion and a peripheral portion 40 . The inlet end 12 and the outlet end 14 of the vortex device correspond to the upstream and downstream ends of the fluid, respectively.

The eddy current device 10C of the present embodiment is the same item as the eddy current device 10B of the second embodiment, but is used in different directions. The definition and structure of all the components of the present embodiment can be understood by the second embodiment, and the same structural parts are obtained. And use the same component symbol. The inlet end 12 of the vortex device 10C corresponds to the upstream end of the fluid and the outlet end 14 corresponds to the downstream end of the fluid. The blades 20 are twisted in a clockwise direction, and the windward surface 23 of each blade 20 and the upstream end of the fluid have a non-zero angle of attack θ; and the leading edge 26 of the blade forms an angle of not less than 45 with the inlet plane A. A leading edge sweep angle α, a trailing edge 28 of the blade and an exit plane B form a trailing edge sweep angle β. The arrangement of the blades and the definition and characteristics of the angle of attack θ, the leading edge sweep angle α and the trailing edge sweep angle β can be referred to in the second embodiment. The leading edge 26 and the trailing edge 28 of this embodiment are in a swept-back manner, and the roots of the leading edge and the trailing edge are inclined from the outside toward the inside toward the tail.

In use, the upstream end of the fluid contacts the windward face 23 of the blades 20, the upwind faces 23 altering the fluid vector such that the fluid forms a primary vortex V, and a portion of the fluid on the windward face 23 follows the leading edge of each blade 26 is turned over to the leeward surface 24 to form a secondary vortex M which is in a different flow direction from the main vortex V and merges into a composite vortex. Similarly, the high angle of attack θ is designed to allow fluid to flow against the blade. The large-angle leading edge sweep angle α reduces the resistance of the secondary vortex M from the windward surface 23 to the leeward surface 24 and reduces the occurrence of turbulence, so that the fluid can be attached to the leeward surface 24, and the secondary vortex can follow the flow velocity of the fluid. To change the flow characteristics of the main eddy current. Part of the fluid flows through the passage 32 of the tubular body 30 and forms A first-class beam that directs the flow of eddy currents.

The vanes 20 of the present embodiment are retracted from the front end 21 toward the rear end 22, so that a fluid flows out of the vortex device 10C to form an inward vortex. The sweepback angle of the trailing edge 28 of the blade controls the eddy current vector trait at the downstream end.

Similarly, by the angle of attack of the blades 20 of the vortex device 10C, the fluid can dissipate and reduce the pressure waves and reflected waves.

14 to 16 show a vortex device 10C according to a fourth embodiment of the vortex device 10D of the present invention, which further includes a plurality of blades 20, a central portion (tube body 30), and a peripheral portion 40. The inlet end 12 and the outlet end 14 of the vortex device correspond to the upstream and downstream ends of the fluid, respectively.

The vanes 20 are arranged in a ring shape in a clockwise direction between the peripheral portion 40 and the tubular body 30. The vanes are twisted, and the windward surface 23 and the upstream flow end of the fluid have a non-zero angle of attack θ. A leading edge sweep angle α is formed between the leading edge 26 of each blade 20 and the entrance end plane A. The leading edge 26 is in the forward swept form with its root 261 adjacent the peripheral portion 40 and the tail portion 262 adjacent the tubular body 30. . The rear end 22 of the blade 20 extends to the outlet end 14 of the device, the trailing edge 28 of the blade being linear, flush with the peripheral portion 40 and the rear end of the tubular body 30, such that the blades 20 have a large area . The arrangement of the blades and the definition and characteristics of the angle of attack θ, the leading edge sweep angle α and the trailing edge sweep angle β can be referred to in the second embodiment.

The operation of the eddy current device 10D of the present embodiment for forming the main eddy current V and the sub eddy current M can be referred to the description of the third embodiment, and it goes without saying.

The blade chord of the blade 20 of the present embodiment (the length of the leading edge to the trailing edge of the blade) is long and has better controllability to the fluid.

The large area of the blade 20 increases the controllability of the fluid, increases the time for changing the fluid vector of the main eddy current, forms a larger main eddy current, and enhances the fluidity and stability of the main vortex V, while the large-area blade A strong secondary vortex M can also be formed, which has the effect of assisting the main vortex V enhancement.

Moreover, the increased blade area can also enhance the ability of the device 10D to resist pressure waves and improve the wave-eliminating effect.

17 to 21 show a fifth embodiment of the vortex device 10E of the present invention, comprising: a plurality of blades 20 and a peripheral portion 40. The inlet end 12 and the outlet end 14 of the vortex device correspond to the upstream and downstream ends of the fluid, respectively.

The blade 20 of the present embodiment is fixed in the hollow peripheral portion 40, and is arranged in a ring shape, and is twisted by the front end 21 toward the rear end 22 in a clockwise direction, and the windward surface 23 of the blade and the flow direction of the fluid upstream end are not Zero angle of attack θ. A leading edge sweep angle α is formed between the leading edge 26 of each blade 20 and the entrance end plane A. The leading edge 26 is in the forward swept form with its root 261 inclined from the outside toward the inside toward the tail 262.

The foregoing structural features can be understood by the fourth embodiment, and are not described herein. The main difference between this embodiment and the fourth embodiment is that in the longitudinal direction of the device 10E, the length of each blade 20 is longer than the peripheral portion 40, so that the blade forms the front half and the rear half, and the front half is fixed to the first half. In the peripheral portion 40, the rear portion exposes the peripheral portion. In the front half, the inner edges of the blades are connected to each other at a central portion (tube 30) of the vortex device 10E, and in the latter half, the blades 20 remain independent, only at the rear end 22 Connected and surrounded by a rear end outlet P, as shown in Figure 18, for fluid circulation. The rear half of each blade has an outer edge 27 and an inner edge 29, and a space between the outer edge 27 and the inner edge 29 of the adjacent blade also forms a passage for fluid to circulate. The trailing edge 28 of the blade rear end 22 is a straight edge. The outer edge 27, trailing edge 28 and inner edge 29 form a functional edge that controls the flow of fluid.

The features disclosed in this embodiment further include that the body of each blade is not limited to a single twisted shape or a single twisted curvature, and different positions between the front end 21 and the rear end 22 may be different twist designs. This embodiment discloses an application example in which the blade 20 has a double twisted shape, the blades 20 themselves are spirally twisted by the center of the vortex device 10E, and the rear half of each blade is further centered on the blade itself. The distortion, for example, but not limited thereto, is shown in Fig. 18, which is twisted at the center D of the width of the blade. Therefore, the front and rear halves of each blade 20 have different twist patterns, the front half of which is a single twisted type, and the second half of which is a double twisted type, which can produce different control of the fluid. The twisting pattern of the blade in this embodiment is merely illustrative, not limiting, and where the blade forms different torsional curvatures and twisting patterns, which is an implementation choice.

The inlet end 12 of the vortex device 10E of the present embodiment, the windward surface 23 of the blade 20, the leeward surface 24, the angle of attack θ, the leading edge sweep angle α of the leading edge 26 of the blade, the operational relationship between the main vortex V and the secondary vortex M It is the same as other embodiments, and can be understood by other embodiments, and will not be described.

After the upstream end of the fluid is guided and controlled by the windward surface 23 of the first half of the blade 20, the main vortex V and the secondary vortex M in different directions are formed, and continue to flow to the second half of the blade 20 along the windward surface 23 and the leeward surface 24. . After the vortex reaches the second half of the blade 20, in addition to continuing along the blade to the outlet 14, a portion of the fluid is actuated by the outer edge 27 and the inner edge 29, and the windward surface 23 is turned over to the leeward side. Face 24 forms multiple secondary eddy currents. Through the angular design of the outer edge 27, the inner edge 29 and the trailing edge 28, the distribution of each secondary vortex can be controlled to achieve the desired flow field characteristics.

In addition, the blade 20 of the present embodiment also has a large area, which can increase the controllability to the fluid, form a larger and more stable main vortex V, and simultaneously form a stronger secondary vortex M to assist the main vortex V, and the present embodiment The multiple secondary eddy currents of the example also control the flow field more effectively.

Furthermore, the blade 20 of the present embodiment has multiple twists and a large area, and has a high shielding rate in the flow path of the flow field, which can effectively reduce pressure waves and reflected waves, and reduce the loss of fluid kinetic energy.

The vortex device 10 of the present invention is not limited to use alone. Referring to FIG. 22, the plurality of vortex devices 10 of any of the embodiments may be juxtaposed with each other to form a vortex device assembly to form a larger The flow area can be applied to a larger flow field to produce the desired flow field characteristics.

The foregoing embodiments are merely illustrative of the technical features of the present invention and are not to be construed as limiting the scope of the invention. The composite composite eddy current generating wave-eliminating device provided by the invention is the first structure in the technical field and has a progressive effect, so the application is made according to law.

Claims

A composite composite eddy current generating wave-eliminating device for use in a fluid flow field, characterized in that the device defines: an inlet end, an outlet end, an inlet end plane and an inlet end axis, the inlet The end corresponds to the upstream end of the fluid, the end corresponding to the downstream end of the fluid; the end plane is defined as the plane formed by the ideal fluid flowing positively into the inlet; the inlet axis is located at the inlet end of the device, and The entrance plane is vertical;

The device contains:

At least one blade having a twisted shape, each of the blades having a front end and a rear end and two faces, the two faces being a windward face and a leeward face, the windward face being the face of the blade facing the fluid; the windward Forming at least one angle of attack between the different positions of the face and the axis of the entry, the angle of attack being not zero degrees;

The front end of each of the blades forms at least one oblique leading edge toward the upstream end of the fluid, and a leading edge sweep angle is formed between the leading edge and the entrance end plane, and the leading edge sweep angle is not less than 45 degrees. The rear end of each of the vanes has a trailing edge facing the downstream end of the fluid.
The composite eddy current generating wave canceling device according to claim 1, wherein the device has a plurality of blades arranged in a ring shape along a center of the device.
A composite eddy current generating wave-eliminating device according to claim 1, wherein each of said blades is twisted in a clockwise direction or twisted in a spiral shape, each of said blades having at least one twisting curvature; each of said windward surfaces forming one or An angle of attack of more than one angle.
The composite eddy current generating wave canceling device according to claim 1, wherein the blades are flared from the front end to the rear end or from the front end to the rear end.
A composite eddy current generating wave-eliminating device according to claim 1, wherein each of said leading edges has a root portion near an upstream end of the fluid and a tail portion near a downstream end of the fluid, the root portion being directed from the inside to the outside toward the tail portion Tilt or tilt from the outside to the inside toward the tail.
The composite eddy current generating wave canceling device according to claim 2, wherein the angle of attack of each of the blades is the same as or different from the angle of attack of the other blades.
The composite eddy current generating wave-eliminating device according to claim 1, further comprising: a hollow peripheral portion, said blade being surrounded by said peripheral portion, wherein an outer edge of each blade is connected to said peripheral portion.
A composite eddy current generating wave canceling device according to claim 7, wherein The front end or the rear end of the blade is exposed to the peripheral portion, and the exposed portion of each of the blades has an outer edge.
The composite eddy current generating wave-eliminating device according to claim 2, further comprising: a central portion located between the blades and having a through passage; the inner edge of the blades is coupled to the center Part.
The composite eddy current generating wave-eliminating device according to any one of claims 1 to 9, wherein the device further has: an exiting plane defined as a plane formed by the ideal fluid flowing out of the outlet end; An end axis, located at the exit end, is perpendicular to the exit end plane; a trailing edge sweep angle is formed between the trailing edge of each vane and the exit end plane.