CN115475546B - Airfoil type microbubble generator - Google Patents
Airfoil type microbubble generator Download PDFInfo
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- CN115475546B CN115475546B CN202211247339.2A CN202211247339A CN115475546B CN 115475546 B CN115475546 B CN 115475546B CN 202211247339 A CN202211247339 A CN 202211247339A CN 115475546 B CN115475546 B CN 115475546B
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- 238000005520 cutting process Methods 0.000 claims abstract description 66
- 230000006698 induction Effects 0.000 claims abstract description 22
- 238000010008 shearing Methods 0.000 claims abstract description 10
- 239000007791 liquid phase Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 34
- 230000005514 two-phase flow Effects 0.000 claims description 28
- 238000009792 diffusion process Methods 0.000 claims description 21
- 230000001939 inductive effect Effects 0.000 claims description 20
- 230000036346 tooth eruption Effects 0.000 claims description 10
- 239000000411 inducer Substances 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000009931 harmful effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005111 flow chemistry technique Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4314—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor with helical baffles
- B01F25/43141—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor with helical baffles composed of consecutive sections of helical formed elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
- B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an airfoil type microbubble generator, which comprises a shell and a central part, wherein the central part comprises an induction blade, a central shaft and a cutting tooth plate group; the central shaft is supported in the shell, and a plurality of rows of cutting tooth plate groups are uniformly distributed on the central shaft; an induction blade is arranged on the central shaft close to one side of the inlet end of the shell, and the guide blades are positioned at the front ends of the cutting tooth groups in a plurality of rows; the central part is rotated by external force for shearing and breaking bubbles in the liquid phase. The invention can reduce boundary layer separation and vortex shedding, so that bubbles are not easy to cause blockage in the flow channel; the device is light in structure, simple, small in occupied space and small and uniform in size, and microbubbles are formed by purely relying on the physical shearing action of the wing-shaped tooth plates.
Description
Technical Field
The invention relates to the field of gas-liquid two-phase mixing, in particular to an airfoil type micro-bubble generator.
Background
Compared with common foam, the micro-bubble has the characteristics of long existence time, high gas-liquid mass transfer rate, high interface point position and the like, has the characteristics of free radicals generated by the micro-bubble, can separate solid impurities in water from impurities in water, can quickly improve the oxygen concentration in water, kill harmful bacteria in water and reduce the friction between solid and liquid, thereby having better application prospect in the fields of air-float water purification, water oxygenation, ozone disinfection, bio-pharmacy, micro-bubble drag reducer and the like.
There are some generators specially used for manufacturing micro-bubbles, but most of these devices have complex structures and large occupied space, and the devices do not consider the resistance loss of fluid, and do not consider the efficiency reduction caused by the blocking of the device by bubbles or the damage to the device caused by collapse.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides an airfoil type microbubble generator which can reduce boundary layer separation and vortex shedding, so that bubbles are not easy to cause blockage in a flow channel; the device is light in structure, simple, small in occupied space and small and uniform in size, and microbubbles are formed by purely relying on the physical shearing action of the wing-shaped tooth plates.
The present invention achieves the above technical object by the following means.
An airfoil microbubble generator comprising a housing and a center member including an inducer blade, a center shaft and a set of cutting blades; the central shaft is supported in the shell, and a plurality of rows of cutting tooth plate groups are uniformly distributed on the central shaft; an induction blade is arranged on the central shaft close to one side of the inlet end of the shell, and the guide blades are positioned at the front ends of the cutting tooth groups in a plurality of rows; the central part is rotated by external force for shearing and breaking bubbles in the liquid phase.
Further, each row of cutting tooth plate group comprises a plurality of wing-shaped cutting tooth plates circumferentially distributed along the central shaft, and the facing angle of the wing-shaped cutting tooth plates in any row of cutting tooth plate groups is opposite to a flow channel between two wing-shaped cutting tooth plates of the adjacent cutting tooth plate groups.
Further, the blade thickness l 2 in each row of cutting blade sets is greater than the gap l 3 between adjacent cutting blade sets.
Further, one end of the shell is an inlet end, the other end of the shell is an outlet end, a diffusion flow passage is arranged in the inlet end, and a contraction flow passage is arranged at the outlet end; the inducing vanes are located in the diffusion flow passage near or partially.
Further, the diffusion flow path satisfies the following constraint:
α∈[45,50]
wherein:
Alpha is the chamfer angle of the diffusion flow passage;
D 1 is the diameter of the inlet end, meters;
d 1 is the diameter of the outer edge of the induced blade, meter;
l 1 is the length of the diffusion channel, meters.
Further, when the induction blade meets the following constraint conditions, the induction blade controls the gas content in the gas-liquid two-phase flow input in the inlet end to be between 5 and 10 percent;
l1＝d1Sl;Sl∈[0.3,0.6]
z∈[3,5]
wherein:
z is the number of the induced blades;
R d is the hub ratio of the induced blade;
d 2 is the inner diameter of the hub of the induced blade, and meters;
l 1 is the axial length of the induced blade rim, meters;
s l is the length-diameter ratio of the induced blade rim;
Q is inlet end flow, cubic meters per second;
v 1 is the induced blade axial velocity, m/s;
u 1 is the peripheral speed of the induced blade rim, m/s;
N is the rotating speed of the induction blade, and the rotation speed is equal to the rotation speed of the induction blade;
beta 1 is the rim setting angle of the induced blade, and the angle is the angle;
a is the angle of attack corrected by the placement angle of the induced blade;
Beta 2 is the angle of placement of the induced blade hub.
Further, the airfoil cutting tooth satisfies the following constraints:
b＝0.15～0.18f
x＝0.3～0.4f
γ＝β1
wherein:
d 3 is the shaft diameter of the central shaft, and meters;
u 2 is the airfoil surface boundary layer flow velocity of the airfoil cutting blade, meters per second;
b is the maximum thickness of the airfoil surface of the airfoil cutting tooth piece and meters;
f is the airfoil chord length of the airfoil cutting tooth piece and meters;
x is the position of the maximum thickness of the wing-shaped cutting tooth piece;
Gamma is the installation angle of the wing-shaped cutting tooth piece, and the angle is the angle;
ρ is the density of the gas-liquid two-phase flow, kg/cubic meter;
η is the dynamic viscosity coefficient of the gas-liquid two-phase flow, pa.s;
Re is the Reynolds number of the gas-liquid two-phase flow on the surface of the airfoil-shaped cutting tooth piece.
Further, the constricted flow path satisfies the following constraint:
β∈[65,70]
wherein:
D 2 is the diameter of the outlet end, meters;
Beta is the tangential angle of the contraction flow passage, and the angle is more than or equal to 65 degrees and less than or equal to 70 degrees;
L 2 is the length of the contracted flow path, meters.
Further, the inlet end is connected to a component for producing a gas-liquid two-phase flow and the outlet end is connected to a nozzle or a microbubble flow application component.
The invention has the beneficial effects that:
1. According to the airfoil type microbubble generator, a plurality of rows of cutting tooth plate groups are uniformly distributed on the central shaft; the guide vanes are arranged at the front ends of the cutting tooth plate groups, so that boundary layer separation and vortex shedding can be reduced, and bubbles are not easy to cause blockage in the flow channel; the device is light in structure, simple, small in occupied space and small and uniform in size, and microbubbles are formed by purely relying on the physical shearing action of the wing-shaped tooth plates.
2. According to the airfoil type microbubble generator, through the physical shearing action of the rows of cutting tooth plates based on airfoil design, the flow channel blockage caused by boundary layer separation and vortex shedding of gas-liquid two-phase flow is reduced, the working efficiency of the device can be obviously improved, and the obtained microbubbles are small and uniform in particle size.
3. The airfoil type microbubble generator further enhances the negative pressure suction effect through the diffusion flow passage and the inducer, and is also beneficial to reducing the boundary layer separation and vortex shedding of the gas-liquid two-phase flow.
4. The airfoil type microbubble generator disclosed by the invention can be used for converging the generated microbubble flow through the contracted flow channel and increasing the dynamic pressure of the flow so as to provide power for entering the microbubble flow treatment device at the back.
5. According to the airfoil type micro-bubble generator, all parts are connected through threads, so that the installation, the disassembly and the replacement of the parts are facilitated, and the connection of the preposed gas-liquid two-phase flow mixing device and the micro-bubble flow processing device is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described, in which the drawings are some embodiments of the invention, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is an exploded view of an airfoil microbubble generator according to the present invention.
Fig. 2 is a cross-sectional view of an airfoil microbubble generator according to the present invention.
Fig. 3 is an outline view of the appearance of the center part according to the present invention.
FIG. 4 is an airfoil profile view of a cutting blade according to the present invention.
Fig. 5 is a profile view of the appearance of the induced blade according to the present invention.
Fig. 6 is a graph showing experimental results of a microbubble generator according to the prior art.
Fig. 7 is an experimental effect diagram of the airfoil type microbubble generator according to the present invention.
In the figure:
1-an inlet end; 2-a central part; 3-an outlet end; 11-a diffusion flow channel; 31-a constricted flow path; 21-inducing leaves; 22-airfoil cutting blades; 23-central axis.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1 and 2, the airfoil type microbubble generator according to the present invention comprises a housing and a central part 2, wherein the central part 2 comprises a guide vane 21, a central shaft 23 and a cutting tooth set; the shell comprises an inlet end shell and an outlet end shell, and the inlet end shell and the outlet end shell are connected through threads, so that the shell can be conveniently detached and installed at any time; the central shaft 23 is supported in the shell, and a plurality of rows of cutting tooth plate groups are uniformly distributed on the central shaft 23; the central shaft 23 near one side of the inlet end of the shell is provided with an induction blade 21, and the guide blade 21 is positioned at the front ends of a plurality of rows of cutting tooth plate groups; the central member 2 is rotated by an external force for shearing and breaking up bubbles in the liquid phase. The external force may be an external rotation mechanism or an impact of two-phase fluid entering the housing to rotate the central member 2.
One end of the shell is an inlet end 1, the other end of the shell is an outlet end 3, a diffusion flow passage 11 is arranged in the inlet end 1, so that the mixed fluid at the inlet can be subjected to speed reduction and pressure increase, the gas phase and the liquid phase are primarily mixed, and meanwhile, the flow speed is reduced, so that the fluid can be better attached to the wall surface of the wing-shaped cutting tooth plate; the outlet end 3 is provided with a contracted flow passage 31, and when the micro-bubble flow flows through the contracted flow passage, the pressure is reduced, so that micro-bubbles in the fluid are uniformly gathered together; the inducer blade 21 is located near or partially within the diffusion channel 11.
As shown in fig. 5, the inducing vane 21 can convert the axial velocity of the gas-liquid two-phase flow into the tangential velocity of the spiral flow, so that the fluid velocity vector is consistent with the cutting facing angle of the airfoil cutting teeth, the inlet pressure is further increased, the harmful effect on the flow is reduced, and the gas content of the gas-liquid two-phase flow is about 5% -10%. As shown in fig. 1 and 3, each row of cutting teeth set includes a plurality of airfoil cutting teeth 22 circumferentially distributed along a central axis 23, and an angle of attack of an airfoil cutting tooth 22 in any row of the cutting teeth set is opposite to a flow path between two airfoil cutting teeth 22 of an adjacent cutting teeth set. The blade thickness l 2 in each row of cutting blade sets is greater than the gap l 3 between adjacent cutting blade sets.
The working principle is as follows:
The pressurized gas-liquid two-phase flow is introduced from the outside, and flows through the diffusion flow channel 11 after entering from the inlet end 1, the diffusion flow channel 11 has a supercharging and decelerating function, and the gas-liquid two-phase is fully mixed; after that, the fluid flows through the inducing blade 21 again, so that the axial speed of the fluid is converted into the tangential speed of the spiral flow, and the inducing blade has negative pressure suction effect, so that more gas-liquid two-phase flow can be sucked into the device, and the working efficiency of the device is improved. Then, the gas-liquid two-phase fluid is impacted on the plurality of rows of wing-shaped cutting tooth plates 22, the bubbles in the fluid are continuously subjected to physical shearing and crushing effects and crushed into bubbles with smaller particle sizes, and finally, the micro-bubble flows formed after the shearing effect of the plurality of rows of tooth plates are gathered and converged at the contraction flow passage 32, so that the fluid pressure in the contraction flow passage is increased, the micro-bubble flows obtain larger kinetic energy, and the follow-up passing through a follow-up connected micro-bubble flow treatment device or a spray head is facilitated. The inlet end 1 is connected with a component for producing gas-liquid two-phase flow, and the outlet end 3 is connected with a nozzle or a micro-bubble flow application component.
In order to make the gas-liquid two-phase flow through the diffusion flow channel 11, the static pressure is increased, so that the gas-liquid two-phase is fully mixed, and meanwhile, the flow speed is reduced, so that the rear surface of the fluid can better fit the wall surface of the airfoil-shaped cutting tooth piece 22, and the diffusion flow channel 11 meets the following constraint conditions:
α∈[45,50]
wherein:
Alpha is the chamfer angle of the diffusion flow passage 11;
D 1 is the diameter of the inlet end, meters;
d 1 is the diameter of the outer edge of the induced blade, meter;
l 1 is the length of the diffusion channel, meters.
When the inducing blades 21 meet the following constraint conditions, the inducing blades 21 can change the axial velocity of the gas-liquid two-phase flow into the tangential velocity of the spiral flow, so that the fluid velocity vector is consistent with the cutting facing angle of the airfoil-shaped cutting tooth piece 22, the inlet pressure is further improved, the harmful effect on the flow is reduced, and the gas content in the gas-liquid two-phase flow input in the inlet end 1 is controlled to be 5% -10% by the inducing blades 21;
l1＝d1Sl;Sl∈[0.3,0.6]
z∈[3,5]
wherein:
z is the number of the inducing blades 21;
R d is the hub ratio of the inducer blade 21;
d 2 is the inner diameter of the hub of the induction blade 21, meter;
l 1 is the axial length of the rim of the inducing blade 21, meters;
s l is the length-diameter ratio of the rim of the induction blade 21;
q is the flow of the inlet end 1, cubic meters per second;
v 1 is the axial velocity of the induced blade 21 in meters per second;
u 1 is the rim circumferential speed of the induced blade 21, m/s;
N is the rotational speed of the inducer blade 21, revolutions per minute;
beta 1 is the rim setting angle of the induction blade 21;
a is the angle of incidence corrected for the placement angle of the inducing blade 21;
beta 2 is the hub mounting angle of the induction blade 21.
In order to enable the curved surface of the airfoil to bypass and reduce the boundary layer separation and vortex shedding of the gas-liquid two-phase flow on the surface of the airfoil cutting tooth 22 to cause bubbles to block the flow passage, the airfoil cutting tooth 22 meets the following constraint conditions:
b＝0.15～0.18f
x＝0.3～0.4f
γ＝β1
wherein:
d 3 is the diameter of the central shaft 23, and is meter;
u 2 is the airfoil surface boundary layer flow velocity, m/s, of the airfoil cutting blade 22;
b is the airfoil surface maximum thickness of the airfoil cutting tooth 22, meters;
f is the airfoil chord length of the airfoil cutting tooth 22, meters;
x is the position of the maximum thickness of the airfoil cutting tooth 22;
Gamma is the installation angle of the airfoil cutting tooth 22;
ρ is the density of the gas-liquid two-phase flow, kg/cubic meter;
η is the dynamic viscosity coefficient of the gas-liquid two-phase flow, pa.s;
re is the Reynolds number of the gas-liquid two-phase flow on the surface of the airfoil-shaped cutting tooth piece 22.
In order to reduce the pressure of the microbubbles flowing through the constricted flow path 31 and to uniformly collect the microbubbles in the fluid, the constricted flow path 31 satisfies the following constraint:
β∈[65,70]
wherein:
D 2 is the diameter of the outlet end 3, meters;
beta is the chamfer angle of the contracted flow passage 31, and the angle is more than or equal to 65 degrees and less than or equal to 70 degrees;
L 2 is the length of the contracted flow path, meters.
Example 1
The tangential angle alpha of the diffusion flow passage 11 is 45 degrees, the diameter D 1 of the inlet end 1 is 0.06 meter, the diameter of the outer edge of the induced blade is 0.1 meter, and the length of the diffusion flow passage isRice;
Hub ratio R d of the inducing blade 21 is 0.4, hub inner diameter d 2 =0.4×0.1=0.04 m of the inducing blade 21, rim length-diameter ratio S l of the inducing blade 21 is 0.3, rim axial length l 1 =0.3×0.1=0.03 m of the inducing blade 21, number z of the inducing blades is 5, inlet end 1 flow design flow Q is 0.0001 cubic meter/second, and axial surface speed of the inducing blade is 0.0001 cubic meter/second The rotation speed N of the induced blade 21 is 200 rpm, and the circumferential speed of the induced blade rim/>The m/s, the incidence angle correction angle a takes 3 degrees, and the blade rim incidence angle is inducedInducing blade hub mounting Angle/>
The central axis diameter d 3 is 0.05 meter, and the flow velocity of the boundary layer on the airfoil surface of the airfoil cutting tooth 22 The chord length f of the wing profile cutting tooth piece 22 is 0.02 m/s, the maximum thickness b= (0.15-0.18) x 0.02=0.003-0.0036 m of the wing profile surface of the wing profile cutting tooth piece 22, the position x= (0.3-0.4) x 0.02=0.006-0.008 m of the maximum thickness of the wing profile cutting tooth piece 22, the installation angle gamma= 11.2372 ° of the wing profile cutting tooth piece 22, the density ρ of the gas-liquid two-phase flow is approximately 1000 kg/cubic m, the dynamic viscosity coefficient eta of the gas-liquid two-phase flow is approximately 0.899 x 10 -3 Pa.s, and the number of the gas-liquid two-phase flow on the surface of the wing profile cutting tooth piece 22/>Boundary layer separation and vortex shedding are not generated in a laminar flow state, and flow channel blockage is not caused;
The tangential angle beta of the contracted flow passage 31 is 65 degrees, the diameter D 2 of the outlet end 3 is 0.06 meter, and the length of the contracted flow passage is And (5) rice.
Compared with the prior art, as shown in fig. 6, the airfoil type microbubble generator designed in the embodiment 1 is a microbubble generator in the prior art, the boundary layer separation and vortex shedding of bubbles can occur on the surfaces of the tooth plates, the blockage is formed in the flow channels between the tooth plates, and finally, the microbubble flow shot by high-speed photography is rare and is unevenly distributed. Fig. 7 shows an airfoil-shaped microbubble generator designed in example 1, wherein the bubbles are tightly adhered to the surfaces of the teeth after being cut by the teeth, and flow passages between the teeth are not blocked, so that the microbubbles are dense and uniform in the obtained experimental effect graph. And the particle size distribution of the microbubbles is approximately: the micro-bubbles of 1-10 micrometers account for about 65%, the micro-bubbles of 10-100 micrometers account for about 30%, and the micro-bubbles of more than 100 micrometers account for about 5%; compared with the prior art with the micro-bubble generator with the micro-bubble particle size larger than 100 micrometers and accounting for more than 70%, the micro-bubble generator has obvious advantages in the distribution of the bubble particle size.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. An airfoil-shaped microbubble generator, characterized by comprising a housing and a central part (2), the central part (2) comprising an inducer blade (21), a central shaft (23) and a set of cutting teeth; the central shaft (23) is supported in the shell, and a plurality of rows of cutting tooth plate groups are uniformly distributed on the central shaft (23); an induction blade (21) is arranged on the central shaft (23) close to one side of the inlet end of the shell, and the guide blades (21) are positioned at the front ends of the cutting tooth groups in a plurality of rows; the central part (2) is rotated by external force and is used for shearing and crushing bubbles in the liquid phase;
When the induction blades (21) meet the following constraint conditions, the induction blades (21) control the gas content in the gas-liquid two-phase flow input in the inlet end (1) to be between 5% and 10%;
l1＝d1Sl;Sl∈[0.3,0.6]
z∈[3,5]
wherein:
z is the number of the inducing blades (21), and is one;
r d is the hub ratio of the induction blade (21);
d 2 is the inner diameter of the hub of the induction blade (21), and meters;
l 1 is the axial length of the rim of the induction blade (21), meters;
s l is the length-diameter ratio of the rim of the induction blade (21);
Q is the flow of the inlet end (1), cubic meters per second;
v 1 is the axial velocity of the inducer blade (21), m/s;
u 1 is the rim circumferential speed of the inducer blade (21), m/s;
N is the rotation speed of the induction blade (21), and is the rotation/minute;
Beta 1 is the rim setting angle of the induction blade (21), and the angle is the same as the rim setting angle;
a is the incidence angle corrected by the placement angle of the inducing blade (21);
beta 2 is the hub mounting angle of the induction blade (21).
2. The airfoil microbubble generator as claimed in claim 1, characterized in that each row of cutting blade sets comprises a plurality of airfoil cutting blades (22) circumferentially distributed along a central axis (23), and the angle of attack of an airfoil cutting blade (22) in any one row of cutting blade sets is opposite to the flow path between two airfoil cutting blades (22) of an adjacent cutting blade set.
3. The airfoil microbubble generator of claim 2, wherein the thickness l 2 of the teeth in each row of cutting teeth set is greater than the gap l 3 between adjacent cutting teeth sets.
4. The airfoil microbubble generator as claimed in claim 1, characterized in that one end of the housing is an inlet end (1), the other end of the housing is an outlet end (3), a diffusion flow passage (11) is arranged in the inlet end (1), and a contraction flow passage (31) is arranged in the outlet end (3); the inducing vanes (21) are located close to or partially within the diffusion flow channel (11).
5. The airfoil microbubble generator as claimed in claim 4, characterized in that the diffusing flow-channel (11) satisfies the following constraints:
α∈[45,50]
wherein:
alpha is the chamfer angle of the diffusion flow passage (11);
D 1 is the diameter of the inlet end, meters;
d 1 is the diameter of the outer edge of the induced blade, meter;
l 1 is the length of the diffusion channel, meters.
6. The airfoil microbubble generator as claimed in claim 1, characterized in that the airfoil cutting teeth (22) satisfy the following constraints:
b＝0.15～0.18f
x＝0.3～0.4f
γ＝β1
Re∈(0,2300)
wherein:
d 3 is the shaft diameter of the central shaft (23), and meters;
u 2 is the airfoil surface boundary layer flow velocity of the airfoil cutting blade (22), meters per second;
b is the maximum thickness of the airfoil surface of the airfoil cutting tooth (22), meters;
f is the airfoil chord length of the airfoil cutting tooth (22), meters;
x is the position of the maximum thickness of the wing-shaped cutting tooth piece (22);
Gamma is the installation angle of the wing-shaped cutting tooth piece (22), and the angle is the installation angle;
ρ is the density of the gas-liquid two-phase flow, kg/cubic meter;
η is the dynamic viscosity coefficient of the gas-liquid two-phase flow, pa.s;
Re is the Reynolds number of the gas-liquid two-phase flow on the surface of the airfoil-shaped cutting tooth piece (22).
7. The airfoil microbubble generator as claimed in claim 4, characterized in that the constricted flow path (31) satisfies the following constraints:
β∈[65,70]
wherein:
D 2 is the diameter of the outlet end (3), meters;
beta is the chamfer angle of the contraction flow passage (31), and the angle is more than or equal to 65 degrees and less than or equal to 70 degrees;
L 2 is the length of the contracted flow path, meters.
8. The airfoil microbubble generator as claimed in claim 4, characterized in that the inlet end (1) is connected to a component for producing a gas-liquid two-phase flow and the outlet end (3) is connected to a nozzle or a microbubble flow application component.
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| CN202211247339.2A CN115475546B (en) | 2022-10-12 | 2022-10-12 | Airfoil type microbubble generator |
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| CN115475546B true CN115475546B (en) | 2024-05-14 |
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| KR101559312B1 (en) * | 2015-05-18 | 2015-10-15 | 주식회사 에이이 | Fine-Bubble Generator |
| CN105399200A (en) * | 2015-12-15 | 2016-03-16 | 东南大学 | Molecule-refining oxygen-dissolution aeration device |
| CN205650095U (en) * | 2016-05-23 | 2016-10-19 | 上海库克莱生态科技有限公司 | Micro -nano bubble generating device |
| KR101829734B1 (en) * | 2017-04-04 | 2018-02-20 | 신창기 | Serve nano micro bubble generator |
| CN110479127A (en) * | 2019-07-18 | 2019-11-22 | 中国矿业大学 | A kind of micro-nano bubble generating device and the method for generating micro-nano bubble |
| CN113262656A (en) * | 2021-05-24 | 2021-08-17 | 中国矿业大学 | Variable pitch helical blade and micro-nano bubble generating device |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101559312B1 (en) * | 2015-05-18 | 2015-10-15 | 주식회사 에이이 | Fine-Bubble Generator |
| CN105399200A (en) * | 2015-12-15 | 2016-03-16 | 东南大学 | Molecule-refining oxygen-dissolution aeration device |
| CN205650095U (en) * | 2016-05-23 | 2016-10-19 | 上海库克莱生态科技有限公司 | Micro -nano bubble generating device |
| KR101829734B1 (en) * | 2017-04-04 | 2018-02-20 | 신창기 | Serve nano micro bubble generator |
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