A mixing device utilizing airfoil wake and a driving method thereof

Abstract

The application provides a mixing device using airfoil wake and a driving method thereof, comprising a mixing flow cavity, a connecting rod mechanism, at least one airfoil baffle and a piezoelectric actuator; the mixing flow cavity is provided with an inlet and an outlet; the connecting rod mechanism is installed inside the mixing flow cavity, and the two sides of the connecting rod mechanism are respectively connected with tracks provided on the mixing flow cavity in a sliding mode, and can slide along the two sides of the mixing flow cavity; the airfoil baffle is installed inside the mixing flow cavity, and is connected with the connecting rod mechanism in a rotating mode through a rotating shaft, and can swing along the rotating shaft; the piezoelectric actuator is provided on the two sides of the mixing flow cavity and is sealed, and is used for driving the fluid flow inside the mixing flow cavity, so as to drive the sliding of the connecting rod mechanism and the swinging of the airfoil baffle. The device has the advantages of simple structure, small volume, easy replacement, low energy consumption and high mixing efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical fluid mixing, and particularly relates to a mixing device utilizing wing-type wake flow and a driving method thereof. BACKGROUND

[0002] With the development of automation technology and medical technology, medical fluid mixing devices can be miniaturized to achieve portability, rapid and efficient mixing. The mixing device used for medical mixing should not react with the liquid medicine, and the mixed objects should be mixed efficiently, sufficiently and uniformly in a short time. The mixing devices currently used mainly include vertical mixers and microfluidic mixers. The vertical mixer is suitable for mixing a large amount of medicine, but its mixing efficiency is not high, and since it contains a paddle or a paddle-like structure, it will cause the existence of a mixing blind area, making it difficult to ensure the uniformity of mixing. In contrast, the microfluidic mixer is small and sensitive. According to the flow field form, the microfluidic mixer is divided into laminar flow mixing type and chaotic convection mixing type. Due to the limitation of the internal flow channel structure size, the flow state in the microfluidic mixer is mostly laminar flow, and the flow turbulence is low, making it difficult to form chaotic convection, and mainly relying on the molecular diffusion effect for mixing. The mixing device has a large volume, a long mixing reaction time and a low mixing efficiency. SUMMARY

[0003] In view of the above technical problems, the present application provides a mixing device utilizing wing-type wake flow, which has a simple structure, a small volume, is easy to replace, has low energy consumption and high mixing efficiency.

[0004] The present application also provides a driving method of the mixing device utilizing wing-type wake flow.

[0005] Note that the description of these objects does not hinder the existence of other objects. One embodiment of the present application does not need to achieve all the above-mentioned objects. The objects other than the above-mentioned objects can be extracted from the description, drawings and claims.

[0006] The present application achieves the above technical objects through the following technical means.

[0007] The wing profile wake mixing device comprises a mixing flow cavity, a piezoelectric material, a metal elastic substrate, a wing profile baffle, a connecting rod mechanism, and a one-way valve; wherein the piezoelectric material is respectively arranged on the two metal elastic substrates, the two metal elastic substrates are respectively arranged on the two sides of the mixing flow cavity, the one-way valve is arranged in the inlet pipe of the mixing flow cavity, the wing profile baffle is installed in the mixing flow cavity and the number of the wing profile baffles is at least one, and the leading edge part of the wing profile baffle is connected with the shaft and can rotate. The two groups of piezoelectric ceramic sheets are respectively applied with electric signals with a phase difference of π, so that the metal elastic substrate drives the mixing flow cavity to generate two-phase specific time sequence traveling waves, and the internal connecting rod mechanism is driven to move and drive the wing profile baffle to swing for mixing. At the same time, the one-way valve in the inlet pipe is passively opened and closed to avoid backflow of the medium to pollute the reagent and improve the mixing efficiency. The wing profile wake mixing device has low running noise, good controllability, no flow dead zone, no pollution to the reagent, high mixing efficiency and can meet the needs of the medical drug mixing field.

[0008] A mixing device utilizing wing profile wake, comprising

[0009] a mixing flow cavity, the mixing flow cavity being provided with an inlet and an outlet;

[0010] a connecting rod mechanism, the connecting rod mechanism being installed in the mixing flow cavity and the two sides of the connecting rod mechanism being respectively connected with the tracks provided on the mixing flow cavity and being capable of sliding along the two sides of the mixing flow cavity;

[0011] at least one wing profile baffle, the wing profile baffle being installed in the mixing flow cavity and being connected with the connecting rod mechanism through a rotating shaft and being capable of swinging along the rotating shaft;

[0012] and a piezoelectric actuator, the piezoelectric actuator being provided on the two sides of the mixing flow cavity and being sealed, and the piezoelectric actuator being used to drive the fluid flow in the mixing flow cavity, so as to drive the sliding of the connecting rod mechanism and the swinging of the wing profile baffle.

[0013] In the above scheme, the piezoelectric actuator comprises a metal elastic substrate and a piezoelectric material;

[0014] the metal elastic substrate is symmetrically arranged on the two sides of the mixing flow cavity, and the metal elastic substrate is provided with at least one group of piezoelectric materials; each group of piezoelectric materials has two polarization directions opposite to each other and symmetrically arranged on the two metal elastic substrates.

[0015] In the above scheme, the piezoelectric actuator is connected with an external electric signal and is driven by a traveling wave or a standing wave.

[0016] In the above scheme, the spacing between each group of piezoelectric materials is consistent and one-to-one corresponding on the two sides; the piezoelectric material is used to receive an external electric signal to generate bending vibration.

[0017] The wing-shaped blocking body is a symmetric wing-shaped structure or an asymmetric wing-shaped structure.

[0018] Further, the wing-shaped blocking body is an asymmetric wing-shaped structure.

[0019] In the above scheme, the wing-shaped blocking body is connected to the middle part of the connecting rod mechanism through a rotating shaft at the tail of the wing-shaped blocking body.

[0020] Further, the wing-shaped blocking body is installed at a front position inside the mixed flow cavity.

[0021] In the above scheme, a one-way valve is arranged at the inlet of the mixed flow cavity.

[0022] A driving method of the mixing device utilizing the wing-shaped wake, comprising the following steps:

[0023] The electric signals with a phase difference of π are respectively applied to the piezoelectric materials, and each phase difference is The phase angle; the first-order bending vibration of the metal elastic substrate bonded to the piezoelectric material is excited; due to the phase difference, the piezoelectric material drives the whole metal elastic substrate to form a traveling wave or a standing wave mode, thereby driving the internal connecting rod mechanism to slide and driving the wing-shaped blocking body to swing; the vibration and deformation of the piezoelectric material driving the metal elastic substrate change the fluid pressure inside the mixed flow cavity, and cooperate with the one-way valve at the inlet to form a periodic and regular one-way flow, and the one-way valve at the inlet of the mixed flow cavity is passively opened and closed to avoid backflow of the medium;

[0024] By changing the excitation frequency and voltage of the piezoelectric material, the liquid mixing rate and the mixed liquid output performance including pressure and flow can be adjusted.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] The present application places a wing-shaped blocking body in the flow cavity, utilizes the vibration of the piezoelectric material on the outer surface of the mixed cavity and the impact of the fluid velocity at the inlet to passively swing the built-in wing-shaped blocking body, intensify the wing-shaped wake, generate vortexes at the leading edge of the wing-shaped blocking body, the trailing edge of the wing-shaped blocking body and the rear of the trailing edge of the wing-shaped blocking body, and construct a complex internal flow field in the flow cavity to achieve uniform mixing of medical drugs. The piezoelectric material driving form can realize the simplification and miniaturization of the mixing device, and the piezoelectric driving form is simple to control, and the voltage and frequency can be adjusted and controlled according to different working conditions and mixing requirements.

[0027] Note that the description of these effects does not hinder the existence of other effects. One embodiment of the present application does not necessarily have all the above-mentioned effects. Effects other than the above-mentioned can be clearly seen and extracted from the description, drawings, claims and the like. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 An isometric view of the mixing device utilizing the wingtip vortex according to an embodiment of the present application.

[0029] Figure 2 An exploded view of the mixing device utilizing the wingtip vortex according to an embodiment of the present application.

[0030] Figure 3 A view of the wingtip baffle according to an embodiment of the present application.

[0031] Figure 4 A view of the flow field according to an embodiment of the present application.

[0032] Figure 5 A view of the piezoelectric material driving signal according to an embodiment of the present application.

[0033] Figure 6 A view of the simulation verification of the computational domain boundary according to an embodiment of the present application.

[0034] Figure 7 A view of the numerical simulation results of the NACA 63-412 airfoil at 0 degree angle of attack according to an embodiment of the present application.

[0035] Figure 8 A view of the numerical simulation results of the NACA 63-412 airfoil at 5 degree angle of attack according to an embodiment of the present application.

[0036] Figure 9 A view of the numerical simulation results of the NACA 63-412 airfoil at 10 degree angle of attack according to an embodiment of the present application.

[0037] Figure 10 A view of the numerical simulation results of the NACA 63-412, NACA 0015, and Clark Y airfoils at 10 degree angle of attack according to an embodiment of the present application.

[0038] Figure 11 A view of the energy loss calculation results of the NACA 63-412, NACA 0015, and Clark Y airfoils according to an embodiment of the present application.

[0039] In the figure,

[0040] 1. Metal elastic substrate

[0041] 2. Piezoelectric material

[0042] 3. Linkage mechanism

[0043] 4. Wingtip baffle

[0044] 5. One-way valve

[0045] 6. The mixing flow cavity. DETAILED DESCRIPTION

[0046] Embodiments of the present application will be described in detail below with reference to the drawings, in which like or similar elements or components each having the same or similar function and structure are designated by the same reference numerals throughout the several drawings. The embodiments described below are examples and are intended to explain the present application, and should not be understood as limiting the present application.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "front", "back", "left", "right", "up", "down", "axial", "radial", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Figure 1 and 2 A preferred embodiment of the wing-type wake utilization mixing device is shown, which comprises a mixing flow cavity 6, a connecting rod mechanism 3, at least one wing-type baffle 4, and a piezoelectric actuator;

[0050] The mixing flow cavity is provided with an inlet and an outlet, and a one-way valve 5 is arranged at the inlet of the cavity;

[0051] The connecting rod mechanism 3 is installed inside the mixing flow cavity 6, and the two sides of the connecting rod mechanism 3 are respectively slidably connected with the tracks arranged on the mixing flow cavity 6, and can slide along the two sides of the mixing flow cavity 6;

[0052] The airfoil-shaped blocking body 4 is installed in the mixed flow cavity 6 and is connected with the connecting rod mechanism 3 through a rotating shaft to be able to swing along the rotating shaft.

[0053] The piezoelectric actuator is arranged on both sides of the mixed flow cavity 6 and is sealed, and is used to drive the fluid flow in the mixed flow cavity 6 to drive the sliding of the connecting rod mechanism 3 and the swinging of the airfoil-shaped blocking body 4.

[0054] The piezoelectric material 2 on the outer surface of the mixed flow cavity 6 is vibrated to passively swing the airfoil-shaped blocking body 4 in the mixed flow cavity 6, intensify the airfoil-shaped wake, generate vortexes in front of the leading edge of the airfoil-shaped blocking body 4, at the trailing edge of the airfoil-shaped blocking body 4 and behind the trailing edge of the airfoil-shaped blocking body 4, and construct a complex internal flow field in the mixed flow cavity 6 to realize uniform mixing of medical drugs.

[0055] The piezoelectric actuator is arranged on both sides of the mixed flow cavity 6 and is sealed to prevent fluid leakage.

[0056] According to the embodiment, preferably, the piezoelectric actuator comprises a metal elastic substrate 1 and a piezoelectric material 2.

[0057] The metal elastic substrate 1 is symmetrically arranged on both sides of the mixed flow cavity 6, and at least one group of piezoelectric materials 2 is arranged on the metal elastic substrate 1; each group of piezoelectric materials 2 has two polarization directions opposite to each other and symmetrically arranged on the metal elastic substrate 1 on both sides.

[0058] According to the embodiment, preferably, the piezoelectric actuator is connected with an external electrical signal and is driven by a traveling wave or a standing wave, but the driving mode is not unique.

[0059] According to the embodiment, preferably, the airfoil-shaped blocking body 4 is installed in the mixed flow cavity 6, and the blocking body can be in any airfoil shape.

[0060] Further, the airfoil-shaped blocking body 4 is in a symmetric airfoil structure or an asymmetric airfoil structure. Preferably, the airfoil-shaped blocking body 4 is in an asymmetric airfoil structure.

[0061] According to the embodiment, preferably, the airfoil-shaped blocking body 4 is connected with the middle part of the connecting rod mechanism 3 through a rotating shaft at the trailing edge of the airfoil-shaped blocking body 4.

[0062] According to the embodiment, preferably, the airfoil-shaped blocking body 4 is installed in the mixed flow cavity 6 at a front position.

[0063] The wing-shaped blocking body 4 is connected with the connecting rod mechanism 3, and can be displaced according to the movement of the piezoelectric actuator.

[0064] The size and number of the inlet pipes of the mixed flow cavity 6 can be adjusted according to the mixing ratio and dosage.

[0065] The one-way valve 5 is arranged in the inlet pipe of the mixed flow cavity 6 to prevent backflow, and the valve is an arbitrary form of one-way valve.

[0066] The piezoelectric materials 2 on the piezoelectric actuator are uniformly spaced and one-to-one corresponding on both sides. The piezoelectric materials are used to receive external electrical signals to generate bending vibration; the corresponding piezoelectric materials on both sides of the piezoelectric actuator of the mixed flow cavity 6 are a group, and the polarization directions of the piezoelectric materials in each group are opposite.

[0067] When the one-way valve 5 is opened, the valve body is opened by external liquid, and the liquid enters the mixed flow cavity 6;

[0068] When the one-way valve 5 is closed, the valve body blocks the inlet pipe under the action of pressure to prevent backflow of the liquid;

[0069] The metal elastic substrate 1 is deformed under the action of the piezoelectric material 2, and the metal elastic substrate 1 is preferably made of soft alloy;

[0070] The thickness of the piezoelectric material 2 is not too large, the width of the piezoelectric material 2 is consistent with the height of the internal flow channel of the mixed flow cavity 6, and the piezoelectric material 2 is pasted above the metal elastic substrate 1;

[0071] The connecting rod mechanism 3 is installed in the sliding groove inside the mixed flow cavity, can produce left and right displacement, and is connected with the tail of the wing-shaped blocking body 4 inside to make them move coordinately;

[0072] The wing-shaped blocking body 4 is connected by a shaft inside the mixed flow cavity and can rotate;

[0073] The piezoelectric material 2 is input by a low-voltage stabilized power supply, the positive electrode of the power supply is connected to the upper surface of the piezoelectric material 2, and the negative electrode of the power supply is connected to the lower surface of the piezoelectric material 2. The piezoelectric material is driven by a traveling wave or a standing wave, the piezoelectric material generates bending vibration deformation, drives the metal elastic substrate 1 to move, and thus drives the internal connecting rod mechanism 3 to move, so that the wing-shaped blocking body 4 swings;

[0074] The piezoelectric materials 2 appear in groups, the corresponding piezoelectric materials on both sides of the mixed flow cavity 6 are a group, and the polarization directions of the piezoelectric materials in each group are opposite, so that the same displacement is generated when the same voltage is applied on both sides of the mixed flow cavity to drive the connecting rod mechanism 3.

[0075] A driving method of the mixed device using the wing-shaped wake, comprising the following steps:

[0076] The two groups of piezoelectric materials 2 are respectively applied with electric signals with a phase difference of π, as shown in Figure 1 The two groups of piezoelectric materials 2 are respectively applied with electric signals with a phase difference of π, as shown in The phase angle; each piezoelectric material 2 excites a first-order bending vibration of the metal elastic substrate 1 bonded with the piezoelectric material 2. Due to the phase difference, the two groups of piezoelectric materials drive the whole metal elastic substrate to form a traveling wave mode, and thus drive the internal connecting rod mechanism 3 to generate movement, drive the wing-shaped blocking body 4 to swing, and the vibration and deformation of the piezoelectric material 2 and the metal elastic substrate 1 changes the fluid pressure in the mixed flow cavity 6, and cooperates with the one-way valve 5 at the inlet to form a periodic and regular one-way flow. At the same time, the one-way valve 5 in the inlet pipe is passively opened and closed to avoid medium backflow and improve mixing efficiency.

[0077] By changing the excitation frequency and voltage of the piezoelectric material 2, the liquid mixing rate and the output performance of the mixed liquid can be adjusted.

[0078] As shown in Figure 2 The outer wall surface of the left and right walls of the mixed flow cavity 6 is pasted with the metal elastic substrate 1 of the piezoelectric material 2, the mixed flow cavity 6 is built-in with a sliding groove, the connecting rod mechanism 3 is placed in the sliding groove and connected with the left and right sides of the mixed flow cavity 6, and the wing-shaped blocking body 4 is connected to make it move coordinately to realize fluid mixing. The mixed flow cavity 6 deforms under the action of the piezoelectric material 2, and its material is preferably an elastic material.

[0079] As shown in Figure 2 , 3 The inlet and outlet pipelines are respectively arranged on the left and right sides of the mixed cavity. The one-way valve 5 is arranged in the inlet pipeline. After the mixed fluid flows into the mixed flow cavity 6 through the inlet, the one-way valve 5 can prevent the backflow of the liquid in the cavity.

[0080] As shown in Figure 3 , 4 The wing-shaped blocking body 4 is installed in the mixed flow cavity 6 through the connecting shaft of the connecting rod mechanism 3. The bending vibration of the piezoelectric material 2 outside the cavity drives the connecting rod mechanism 3 to displace, thereby driving the wing-shaped blocking body 4 to swing and generating Figure 4 The vortex street shown in the tail edge flow field of the wing-shaped blocking body 4 increases the mixing area of the mixed medium in the mixed flow cavity 6 and improves the mixing efficiency.

[0081] As shown in Figure 1 , 2 The metal elastic substrate 1 is arranged on the outer wall surface of the mixed flow cavity 6 and has a rectangular block structure. The metal elastic substrate 1 is bonded with the mixed flow cavity 6 by using soft glue which has no chemical reaction interference with the mixed fluid. The upper surface of the metal elastic substrate 1 is bonded with the piezoelectric material 2. The metal elastic substrate 1 is stressed by the piezoelectric material 2 and drives the wing-shaped blocking body 4 to swing regularly.

[0082] Combination Figure 1 , 2 As shown, the piezoelectric material 2 is made of piezoelectric material, and its thickness should not be too large. In a specific embodiment of the present invention, preferably, it consists of 4 pieces in a block-like structure; 2 pieces are evenly distributed on both sides, arranged in a linear array along the axial direction, with the axial spacing of the piezoelectric materials 2 on both sides being consistent and their radial directions corresponding one-to-one. The piezoelectric material 2 is used to receive external electrical signals to generate bending vibration; the piezoelectric materials 2 corresponding to each side of the mixing flow cavity 6 form a group, and the polarization directions of each group of piezoelectric materials 2 are opposite.

[0083] like Figure 5 As shown, the external electrical signal for the common piezoelectric material 2 is a sinusoidal driving signal with adjustable amplitude and frequency, but it is not limited to a sinusoidal signal; other forms of electrical signals, such as triangular wave signals or square wave signals, can also be used. By adjusting the phase difference and phase angle on the piezoelectric material 2, and in conjunction with adjusting parameters such as the frequency and amplitude of the input external electrical signal, different waveform modes can be constructed to achieve different effects of medium mixing. For example... Figure 6 As shown, numerical calculations were performed on the flow field inside the mixing flow cavity 6. The simulation software used was COMSOL Multiphysics, and the computational domain was as follows. Figure 6 During the flow process inside the cavity, the fluid is set to be incompressible, and the fluid medium is selected as water.

[0084] like Figure 7 , 8 As shown in Figure 9, in Figure 7 , 8 The images in Figure 9 are arranged from top to bottom as follows: side view of the fluid domain, top view of the upper airfoil, and bottom view of the lower airfoil. Based on regularized helicity identification, the vortex isosurface distribution maps of the airfoil inside the mixer cavity at angles of attack of 0, 5, and 10 degrees are extracted. The airfoil used in the simulation is NACA63-412.

[0085] Regularized spirality H n Based on the angle between the velocity vector and the vortex vector, this method can accurately capture the position of the vortex core. n Defined as the dot product of velocity (V) and vorticity (ω) divided by the product of the magnitudes of the velocity and vorticity, its expression is:

[0086]

[0087] Regularized spirality H n The sign indicates the direction of vortex rotation. With the fluid direction as positive, H... n A positive value indicates that the vortex is rotating counterclockwise; H n A negative value indicates that the vortex is rotating clockwise. Hn The larger the absolute value, the stronger the vortex.

[0088] like Figure 7 As shown, when the angle of attack is 0 degrees, a pair of vortices of the same size and opposite rotation direction appear on the upper and lower surfaces of the airfoil leading edge region inside the mixing flow cavity 6; a pair of vortices of the same size and opposite rotation direction also appear on the upper and lower surfaces of the airfoil trailing edge region. The vortices gradually migrate and dissipate along the direction of fluid flow, and the volume of the vortices gradually increases from the center of the mixing flow cavity 6 toward the outer wall of the cavity, with the vortex volume being the largest near the outer wall.

[0089] like Figure 8 As shown, when the angle of attack is 5 degrees, vortices of roughly the same size but opposite rotation are generated on both the upper and lower surfaces of the airfoil leading edge inside the mixer cavity. The volume of the vortex system is approximately the same as that under the 0-degree angle of attack condition.

[0090] There are vortex systems of roughly the same size but opposite rotation on the upper and lower surfaces of the airfoil trailing edge. The volume of the vortex systems is significantly larger than that under the 0-degree angle of attack condition, and they are stretched in the direction of fluid flow. The volume of the vortex systems increases rapidly from the centerline of the mixing cavity to the near wall side. In the wake region of the airfoil, large-scale shedding vortices with similar scale and opposite rotation appear. The large-scale vortices can promote further mixing of the fluid in the cavity. Below the shedding vortices in the wake of the airfoil, a separate vortex system appears, with a vortex intensity less than that of the large-scale vortices in the wake of the airfoil.

[0091] Depend on Figure 9 It can be seen that when the angle of attack is 10 degrees, a pair of vortices of the same size but opposite rotation direction are generated on both the upper and lower surfaces of the airfoil leading edge region inside the mixer cavity. The vortex on the lower surface is stretched along the airfoil surface compared to the vortex under the 0-degree and 5-degree conditions, and the vortex volume increases. There is still a pair of vortex systems with basically the same size but opposite rotation direction at the airfoil trailing edge. The volume of the vortex system is further increased compared to the 0-degree and 5-degree conditions, and it extends to the upper surface of the airfoil. In the airfoil wake region, the volume of the symmetrical shedding vortex system is further increased. The volume of the individual vortex system below the shedding vortex system in the airfoil wake region is further increased.

[0092] Comprehensive analysis Figure 7 , 8 As shown in Figure 9, the vortex volume in the leading edge region of the mixing cavity is significantly smaller than that in the trailing edge region. With increasing angle of attack, the vortex volume in the leading edge region of the airfoil increases slightly, and the vortex system on the lower surface is stretched along the lower surface of the airfoil. The vortex system in the trailing edge region of the airfoil shows a rapid growth trend from the centerline of the mixing cavity towards the two side walls, and the vortex volume in the trailing edge region of the airfoil increases significantly with increasing angle of attack. At angles of attack of 5 degrees and 10 degrees, large-scale shedding vortices with similar volumes and opposite rotation directions appear in the airfoil wake region, and below the large-scale shedding vortices in the airfoil wake region, there exists a separate vortex system with relatively low vortex intensity.

[0093] The size and volume of the vortex inside the mixing flow cavity 6 and the vortex rotation direction have a significant influence on the mixing effect of the mixing flow cavity 6, that is, the larger the size and volume of the vortex and the more turbulent the flow field, the larger the contact area between fluid molecules inside the mixing cavity, and the better the mixing effect. Therefore, according to the numerical calculation result, it can be known that the mixing device using the wing type wake for mixing has a good mixing effect, and the larger the attack angle, the better the mixing effect.

[0094] As shown in Figure 10 , different forms of airfoils are selected under an attack angle of 10 degrees: NACA63-412, NACA0015, and Clark Y, and the mixing effect is explored, Figure 10 As shown in the figure, the fluid domain side view, the upper wing surface plan view, and the lower wing surface plan view are arranged in order from top to bottom.

[0095] Numerical simulation shows that the distribution position and distribution form of the vortex in the flow field of the three airfoils are similar, indicating that any structure of the airfoil can achieve the effect of mixing the medium in the flow field through the airfoil wake. However, the size of the vortex generated by different airfoils is slightly different, as Figure 10 can be known.

[0096] The vortex volume generated by the symmetrical airfoil NACA0015 at the airfoil trailing edge and the airfoil wake area is smaller than that of the other two asymmetrical airfoil structures, and the volume of the low-intensity vortex system below the airfoil wake shedding vortex system is also the smallest.

[0097] According to the numerical calculation result, any airfoil structure can achieve the effect of mixing the medium in the mixing cavity, but compared with the symmetrical airfoil structure NACA0015, the vortex volume of the asymmetrical airfoil structures NACA63-412 and Clark Y is larger, and the mixing effect is better.

[0098] As shown in Figure 11 , NACA63-412, NACA0015, and Clark Y airfoils of different structures are selected under an attack angle of 10 degrees, and the energy dissipation value inside the flow field is used to numerically characterize the flow field.

[0099] The viscosity of the fluid itself and the Reynolds stress generated during flow will cause irreversible energy dissipation of the fluid during flow in the mixing cavity, and the vortex generated during flow will intensify the energy dissipation.

[0100] At the same time, airfoils of different structures and different attack angles will affect the shape, distribution position, and volume of the vortex in the flow field, and different energy losses will be generated.

[0101] The energy dissipation function is defined as

[0102]

[0103] where μ is the viscosity coefficient, Θ is the swell, δ ij is the viscosity coefficient, ζ is the volume viscosity coefficient, e ij is the strain rate tensor, i and j are free indices of the tensor.

[0104] The total energy dissipation can be calculated by the following formula, which is the sum of the energy dissipation of each grid volume in the calculation domain:

[0105]

[0106] where V is the grid volume.

[0107] The global energy loss calculation of the fluid domain in the mixing cavity shows that the energy loss of the symmetric airfoil structure NACA0015 is slightly smaller than that of the asymmetric airfoil structures NACA63-412 and Clark Y, and the side indicates that the mixing effect of the asymmetric airfoil structure is slightly better than that of the symmetric airfoil structure.

[0108] The working principle of the application is:

[0109] The two groups of piezoelectric materials 2 are respectively applied with electric signals with a phase difference of π, and each piezoelectric material 2 excites a first-order bending vibration of the metal elastic substrate 1 bonded with the piezoelectric material 2. Due to the phase difference, the two piezoelectric materials 2 drive the metal elastic substrate 1 and the outer wall surface of the mixed flow cavity 6 to form two-phase specific time sequence traveling wave modes. The vibration mode of the outer wall surface of the mixed flow cavity 6 drives the internal connecting rod mechanism 3 to produce movement, and drives the airfoil baffle 4 to swing, and the swing of the airfoil baffle 4 generates a certain volume of vortex in the internal flow field of the mixed flow cavity 6, increases the degree of flow field turbulence, and plays a role of fluid mixing. The metal elastic substrate 1 drives the mixed flow cavity 6 to deform, and in the process of gradually increasing the cavity volume, due to the pressure difference between the inside and outside, the inlet mixed fluid is sucked; then the mixed flow cavity 6 forms several time changes, the piezoelectric material 2 makes the mixed flow cavity 6 two side walls form a traveling wave mode and drive the airfoil baffle 4 to swing, realizing fluid mixing; with the passage of time, the mixed flow cavity 6 extrudes the mixed fluid in the cavity to continuously advance along the axial direction, and finally discharges from the outlet pipeline. The one-way valve 5 in the inlet pipe is passively opened and closed, which can avoid the pollution of the reagent caused by the backflow of the fluid.

[0110] The application places the airfoil baffle 4 in the mixed flow cavity 6, utilizes the cooperation vibration of the piezoelectric material 2 on the outer surface of the mixed flow cavity 6 and the impact of the inlet fluid speed, passively swings the built-in airfoil baffle 4, intensifies the airfoil wake, generates vortexes in the front edge of the airfoil baffle 4, the trailing edge of the airfoil baffle, and the rear of the trailing edge of the airfoil baffle 4, and constructs a complex internal flow field in the mixed flow cavity 6 to realize uniform mixing of medical drugs. The piezoelectric material 2 driving form of the application can realize the simplification and miniaturization of the mixing device, and the piezoelectric driving form is simple to control, and the voltage and frequency can be adjusted and controlled according to different working conditions and mixing requirements.

[0111] It should be understood that although the present specification is described in terms of various embodiments, each of which describes only one implementation, the specification is intended to cover all possible combinations for each independent hardware or software feature and its alternatives. A person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other implementation manners that can be understood by a person skilled in the art.

[0112] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not used to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A mixing device utilizing a wingtip vortex flow, characterized by, Comprising a mixing flow cavity (6); the mixing flow cavity (6) is provided with an inlet and an outlet; a connecting rod mechanism (3) installed inside the mixing flow cavity (6), and the two sides of the connecting rod mechanism (3) are respectively connected with the tracks provided on the two sides of the mixing flow cavity (6) in a sliding manner, and can slide along the two sides of the mixing flow cavity (6); at least one airfoil baffle (4); the airfoil baffle (4) is installed in the mixing flow cavity (6), and is connected with the connecting rod mechanism (3) through a rotating shaft in a rotating manner, and can swing along the rotating shaft; and a piezoelectric actuator; the piezoelectric actuator is provided on the two sides of the mixing flow cavity (6) and is sealed, and the piezoelectric actuator is used to drive the fluid flow inside the mixing flow cavity (6), so as to drive the sliding of the connecting rod mechanism (3) and the swinging of the airfoil baffle (4); the piezoelectric actuator comprises a metal elastic substrate (1) and a piezoelectric material (2); the metal elastic substrate (1) is symmetrically provided on the two sides of the mixing flow cavity (6), and at least one group of piezoelectric materials (2) is arranged on the metal elastic substrate (1); each group of piezoelectric materials (2) has two metal elastic substrates (1) arranged on the two sides in opposite and symmetrical directions.

2. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The spacing between each group of piezoelectric materials (2) is consistent and one-to-one corresponding on the two sides; the piezoelectric material (2) is used to receive external electrical signals to generate bending vibration.

3. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The piezoelectric actuator is connected with external electrical signals and adopts traveling wave or standing wave driving. The airfoil baffle (4) is a symmetric airfoil.

4. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The airfoil baffle (4) is an asymmetric airfoil structure.

5. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The airfoil baffle (4) is connected with the middle part of the connecting rod mechanism (3) through a rotating shaft at the tail of the airfoil.

6. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The airfoil baffle (4) is installed at a front position inside the mixing flow cavity (6).

7. The mixing device utilizing a wing-type wake according to claim 1, characterized by, A one-way valve (5) is arranged at the inlet of the mixing flow cavity (6).

8. The mixing device utilizing a wing-type wake according to claim 1, characterized by, The steps include:

9. A method of driving a mixing device using a wing-type wake according to any one of claims 1 to 8, characterized in that, external electrical signals with a phase difference of π phase difference are respectively applied on the piezoelectric materials (2), and each phase difference is j phase angle in time; each piezoelectric material (2) excites a first-order bending vibration of the metal elastic substrate (1) bonded with the piezoelectric material; due to the phase difference, the piezoelectric material (2) drives the whole metal elastic substrate (1) to form a traveling wave or standing wave mode, thereby driving the internal connecting rod mechanism (3) to slide and driving the airfoil baffle (4) to swing; the one-way valve (5) at the inlet of the mixing flow cavity (6) is passively opened and closed to avoid medium backflow; by changing the excitation frequency and voltage of the piezoelectric material (2), the liquid mixing rate and the mixed liquid output performance including pressure and flow can be adjusted. ​

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