CN109570517A - A kind of design method of supersonic speed Laval nozzle constructional alloy melt atomization device - Google Patents
A kind of design method of supersonic speed Laval nozzle constructional alloy melt atomization device Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/088—Fluid nozzles, e.g. angle, distance
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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Abstract
A kind of design method of supersonic speed Laval nozzle constructional alloy melt atomization device belongs to alloy powder atomization preparation field.The present invention passes through research supersonic speed Lavalle wall surface curve, in conjunction with the characteristics of close coupling atomization, according to swabbing pressure criterion, close coupling criterion and flow field velocity criterion, devise a kind of supersonic speed Laval nozzle structure atomizer, and the influence using cfdrc analog study atomization air pressure, atomizing air temperature, the gas spout hole heart away from the five big principal element convection current field structures such as, gas injection angle and diversion pipe extension elongation.And then the structural parameters of nozzle can be optimized, it avoids gas backstreaming and regurgitates phenomenon, provide guarantee while improving nebulization efficiency efficiency for the alloy powder production of high quality.The generation for phenomena such as atomizer of the present invention can prevent water conservancy diversion blockage, gas present in atomizer from regurgitating, reduces the generation of shock wave and flow-disturbing, and can be reduced the flying distance of gas and promote flow field velocity, reduces the loss of energy.
Description
Technical field
The invention belongs to alloy powders to be atomized preparation technical field, in particular to a kind of supersonic speed Laval nozzle structure is closed
The design method of golden melt atomization device.
Background technique
Gas atomization is to prepare a kind of important method of high-performance metal and alloy powder, with traditional grinding crush method and
Electrochemical process is compared, it mainly has the advantages such as narrow particle size distribution, cooling rate are big, powder sphericity height is low with impurity content；Gas
Atomization applicability is extensive, in addition to refractory metals tungsten, molybdenum etc. and very active metal, is suitable for most metals and conjunction
The preparation at bronze end.In recent years, more and more for the research of aerosolization, focus primarily upon atomization flow field structure, powder size
The research of influence factor and melt crushing behavior.Such as found after studying the narrow annular channel nozzle of fixed width,
There are " opening whirlpool " and " closing whirlpool " two kinds of typical flow field structures in flow field, and the transformation of both flow field structures and nozzle arrangements are joined
Several and atomization pressure is related.The interaction between narrow annular channel atomization gas and melt is for another example simulated, discovery column is molten
Body is moved along nozzle centerline, annular high-speed flow bath surface formed disturb and push it against downstream formed it is unstable
Liquid level, unstable melt flow edge break form second-time breakage at small liquid band.At present both at home and abroad to gap nozzle
Study on Flow Field is more, and less for the Study on Flow Field of supersonic nozzle atomizer, and also inadequate system is goed deep into.Related patent master
If based on the qualitative improvement that solution particular problem designs nozzle, without being that guiding is logical from basic principle and with problem
It crosses and proposes design criteria and carry out the quantifying design method that feasible simulation technology proposes atomizer nozzle critical feature size.This Shen
Please lead in conjunction with supersonic speed Lavalle wall surface curve and close coupling atomization the characteristics of, according to swabbing pressure criterion, close coupling criterion and
Flow field velocity criterion devises a kind of supersonic nozzle structure atomizer.Using cfdrc, analog study is different
Flow field structure under influence factor is optimized and is designed to the structural parameters of nozzle.
Summary of the invention
The object of the present invention is to provide a kind of new methods of alloy atomization device design, design alloy powder mist with the method
The generation for phenomena such as changing device, can preventing water conservancy diversion blockage, gas present in atomizer from regurgitating, and this method combines drawing
The jet pipe of Wa Er converging diverging type, tube wall are connected using smooth curve, and air-flow does not generate Prandtl-after spout ejection
Günther Meier wave reduces the generation of shock wave and flow-disturbing, and can reduce the flying distance of gas to the maximum extent and promote flow field
Speed reduces the loss of energy.
A kind of design method of supersonic speed Laval nozzle constructional alloy melt atomization device, it is characterised in that super by studying
Velocity of sound Lavalle wall surface curve, in conjunction with the characteristics of close coupling atomization, according to swabbing pressure criterion, close coupling criterion and flow field velocity
Criterion is sprayed using cfdrc analog study atomization air pressure, atomizing air temperature, the gas spout hole heart away from, gas
The influence of firing angle degree and diversion pipe extension elongation convection current field structure, optimizes nozzle structural parameters, avoids gas
It flows back and regurgitates, improve nebulization efficiency efficiency and silty amount processed；The gas spray pipe passes through the section of nozzle center's axially bored line
In figure, the center line extended line and diversion pipe centre bore axis in Lavalle curve circumferential weld channel are crossed to form angle α, as gas
Spray angle, α are 0-60 °.
Further, in sectional view of the gas spray pipe by nozzle center's axially bored line, the contraction section AB is bent
The ratio between width and axial length of line are 1:1-1:4.
Further, in section of the gas spray pipe by nozzle center's axially bored line, the dilation curve BC
Axial width least part with the expansion where CD is throat diameter A0, and exporting out is outlet diameter A2, wherein A2/A0
It is determined by the Mach number of design, A2/A0 value is 4:1-16:1.
Further, what the diversion pipe extension elongation indicated is that draft tube outlets are stretched out relative to gas vent platform
Length, length value 0-20mm.Water conservancy diversion bore 4-12mm, diversion pipe terminal end shape are round or rectangular etc..
Further, the gas spout hole heart away from expression is that the center of gas vent circumferential weld is formed by the hole heart
Away from value 20-80mm.
Further, supersonic speed circumferential weld nozzle atomization powder main technologic parameters and range that the present invention designs are as follows: atomization
Gas pressure 1-10MPa, 27-500 DEG C of atomizing air temperature, gaseous species are nitrogen, argon gas, air etc., melt superheat degree 0-
400 DEG C, melt flow 0.05-1.00Kg/min.
In order to achieve the above object, design criteria and technical solution proposed by the present invention are as follows.
1, atomizer design criteria
(1) swabbing pressure criterion
Pressure when molten metal is flowed out from diversion pipe, by the generation of the pressure difference of gravity and draft tube outlets and metal bath surface
Power effect.This pressure difference is defined as swabbing pressure, is static pressure and crucible liquid level at draft tube outlets
The difference of environmental pressure.When swabbing pressure is less than zero, in the accelerated sucking atomizer of molten metal, be conducive to the suitable of atomization process
Benefit carries out.When swabbing pressure is greater than zero, the molten metal flow velocity of diversion pipe outflow will be slowed.Swabbing pressure is equal to melt when pumping
Suction pressure power be equal to melt gravity when, when swabbing pressure be equal to melt gravity when, melt stress balance, flow velocity are at this time
Zero, melt will be unable to flow out, and atomization process will interrupt；Static pressure at draft tube outlets further increases, mist
Change gas then possibly even to flow backward by diversion pipe into crucible, leads to the phenomenon that blistering or regurgitating.Swabbing pressure depends on leading
Static pressure at flow tube nozzle will be such that atomization process goes on smoothly, and should control the pressure at water conservancy diversion nozzle and be less than normal atmosphere
Pressure, melt flows will not be just hindered.The critical atomization air pressure exactly corresponding atomization air pressure when molten metal flow velocity is zero,
It is to maintain the maximum atomizing pressure that atomization process is gone on smoothly.So-called swabbing pressure criterion is exactly to guarantee that atomization process is suitable
Benefit carries out, should selection aerosolization pressure, atomizing air temperature, the nozzle holes heart away from, spray angle, diversion pipe extension elongation etc.
Meet this criterion when atomization parameter, goes on smoothly atomization process.
(2) close coupling design criterion
Under the premise of following swabbing pressure criterion, is designed for Optimizing Spray Nozzle Structure and propose close coupling design criterion, this
Criterion are as follows: in the case where guaranteeing the minus situation of suction pressure, make atomization gas be applied to metal in shortest distance as far as possible and melt
In body.Compared to plain nozzle, this criterion greatly shortens the distance of atomization gas flight, reduces the damage of gas kinetic energy
It loses, keeps melt broken more abundant, reduce the median particle and size distribution standard deviation of atomized powder.
(3) flow field velocity criterion
Under the premise of following swabbing pressure criterion and close coupling design criterion, available bigger flow field velocity is selected
Nozzle arrangements obtain bigger flow field velocity, are conducive to be sufficiently broken to melt, obtain more tiny powder.
2, atomizer design technology project
(1) Laval nozzle designs
The gas spray pipe of atomizer uses the Laval nozzle of converging diverging structure in the present invention.The nozzle structure can
Gas is accelerated to supersonic speed, the high-speed flow of Parallel exporting is obtained, air-flow does not generate expansion compression shock, reduces energy
The generation of loss and flow-disturbing, obtains the gas flowfield of uniform concentration.Nozzle wall is symmetrical about jet pipe central axis by two
Lavalle curve is constituted, and gas nozzle central axis and diversion pipe central axis have a certain degree inclination, as gas injection
Angle.And Lavalle curve is made of constriction AB and BC and CD sections of expansion, wherein B point is throat, connects water conservancy diversion
The inclined-plane of pipe and gas spout is the side extended to form by gas spray pipe exit tangent.The circumferential weld shape gas spray pipe is to draw
Wa Er curve is rotated by 360 ° the inclined curved surface to be formed around diversion pipe central axis and constitutes.In the present invention, Lavalle curve
Contraction section curve AB determines that expansion segment curve BC and CD use the analytic method designed based on characteristic curve to determine using quintic curve.
Expansion segment BCD determines that curve is smoothly connected it using analytic method, and dilation curve can be divided into BC and two sections of CD by analytic method.This hair
It is bright to use the inert gases such as nitrogen as atomization gas, according to exit Mach number and gas type, in conjunction with equal entropy flux formula, if
Count corresponding discharge area and throat opening area ratio A2/A0.The specific structure of Laval nozzle is as shown in figures 1 and 3.
(2) software simulation setting
The simulation for being atomized flow field structure is completed by business computing hydrodynamics software ANSYS FLUENT, and flow field simulation is selected
K- ε model can be used as atomization gas as turbulence model, argon gas, nitrogen, air, and the density that gas is arranged is perfect gas shape
State, viscosity are calculated by Sutherland formula, since the flowing of atomization gas is the compressible problem of high speed, Coupled are selected to ask
Solve device.Available atomization gas Flow Field Distribution information, analysis Flow Field Distribution rule and reflux zone properties are set according to simulation, are obtained
The atomizer structure and process parameters range that must optimize.
3, the influence of major parameter and structural dimensions determine
Atomizing pressure is the principal element for influencing aerosolization process, it not only influences gas kinetic energy, also influences mass flow indirectly
Than with powder surface smoothness.The kinetic energy of atomization gas is directly proportional to temperature, and lift gas temperature can be obviously improved gas
Flow field velocity promotes fine powder yield rate.The nozzle holes heart is away from the diameter for being cyclic annular Laval nozzle outlet.Spray angle, that is, Bearing score
The angle of your nozzle exit axis and diversion pipe axis.Diversion pipe extension elongation, that is, draft tube outlets go out relative to Laval nozzle
Saliva plane distance outstanding.The nozzle holes heart is away from, spray angle.Spray angle, diversion pipe extension elongation and recirculating zone static pressure
It is closely related to close swabbing pressure, has a direct impact to reflux plot structure.
Using cfdrc analog study atomization air pressure, atomizing air temperature, the gas spout hole heart away from, gas
The influence of body spray angle and the big principal element convection current field structure of diversion pipe extension elongation five.It was found that: (1) superonic flow nozzzle
Typical flow fields structure is different from traditional nozzle, and air stream outlet does not form dilatational wave after spraying, and not will form the flow field knot for closing whirlpool
Structure；Occurs typical cone cell gas backstreaming area below diversion pipe, the temperature in flow field can decline as gas expansion accelerates.Difference pressure
Flow field structure under power is very similar, and only as the increase of air pressure, flow field velocity increase, region increases, and diversion pipe static pressure
As pressure increase is first to maintain lower value, then gradually rise.(2) kinetic energy of atomization gas is related to temperature, lift gas
Temperature linearly can promote the speed in flow field, while promote flow field temperature, be a kind of important method for refining powder size.
(3) with the gas spout hole heart away from increase, reflux region be gradually increased, flow field velocity reduce, draft tube outlets static pressure
It gradually decreases, but after the gas spout hole heart is away from increasing to a certain extent, diversion pipe static pressure tends towards stability, and no longer drops therewith
It is low.(4) gas injection angle can significantly affect flow field structure, and with the increase of the angle, the speed in flow field is consequently increased, and
Gas meet back reflection effect enhancing, form strong back wave and mach disk.But it will increase water conservancy diversion while increasing the angle
The static pressure in pipe exit reduces swabbing pressure, reduces critical atomization pressure.Therefore gas injection angle should not be too large, and control at 30 °
Left and right is more appropriate.(5) diversion pipe extension elongation is equally an important factor for influencing flow field structure, with the increasing of the extension elongation
Add, raised variation tendency after flow field velocity is increased slightly, and static pressure has one first to reduce in recirculating zone, and is reached in 6-8mm
To minimum, the stretching is controlled in this range and help to obtain biggish swabbing pressure.
By simulation calculation and optimization, the main atomization parameter range that finally provides are as follows: atomization pressure 1-10MPa；
27-500 DEG C of atomizing air temperature；Gaseous species are nitrogen, argon gas, air etc.；0-400 DEG C of melt superheat degree；Melt flow
0.05-1.00Kg/min.The structural dimensions range finally provided are as follows: 0-60 ° of gas injection angle；The atomizer hole heart away from
10-80mm；Diversion pipe extension elongation 0-20mm, water conservancy diversion bore 4-12mm, diversion pipe terminal end shape can be round, rectangular etc.；
The ratio between Laval nozzle contraction section width and axial length 1:1-1:4；The ratio of Laval nozzle outlet diameter and throat diameter
It is determined by the Mach number of design, is 4:1-12:1.
The present invention is by research supersonic speed Lavalle wall surface curve, in conjunction with the characteristics of close coupling atomization, according to swabbing pressure
Criterion, close coupling criterion and flow field velocity criterion devise a kind of supersonic speed Laval nozzle structure atomizer, and utilize calculating
Hydrodynamics software analog study atomization air pressure, atomizing air temperature, the gas spout hole heart away from, gas injection angle and are led
The influence of the big principal element convection current field structure of flow tube extension elongation etc. five.And then the structural parameters of nozzle can be optimized, it keeps away
Exempt from gas backstreaming and regurgitated phenomenon, provides guarantor while improving nebulization efficiency efficiency for the alloy powder production of high quality
Card.The alloy powder atomizer of the method for the present invention design, can prevent water conservancy diversion blockage, gas present in atomizer from regurgitating
The generation of phenomenon, and this method combines the jet pipe of Lavalle converging diverging type, and tube wall is connected using smooth curve,
Air-flow can be accelerated into supersonic condition, obtain the high-speed flow of Parallel exporting, this air-flow does not generate general after spout ejection
Lang Te-Günther Meier wave reduces the generation of shock wave and flow-disturbing, and can reduce the flying distance and promotion of gas to the maximum extent
Flow field velocity reduces the loss of energy.
Detailed description of the invention
Fig. 1 Laval nozzle wall surface curvilinear structures figure
Wherein: curve AB is contraction of gas section curve；R1 is contraction section inlet radius；L1 is contraction section axial length；B point
For Laval nozzle throat；R0 is throat radius；Curve BC and CD are dilation curve；C point is dilation curve tie point, is curve
Inflection point, the connection of two line smoothings；L2 is expansion segment axial length；R2 is expansion segment exit radius；R1 and r2 is analytic curve
Radius；θ is the corresponding angle of arc length.
Fig. 2 atomizing nozzle structure schematic diagram
Wherein: 1 is atomizer fixation hole；2 be annular air storing cavity；3 be diversion pipe；4 be tangential admission mouth；5 be Lavalle
Gas spray pipe；D be the gas spout hole heart away from；α is gas injection angle；H is diversion pipe extension elongation.
Fig. 3 atomizer Laval nozzle profile
Its alphabetical meaning is identical as Fig. 1.
Specific embodiment
Simulation calculates discovery, and when atomizing pressure is 1.7MPa, gas does not expand after spraying when atomization air pressure is lower,
When atomization air pressure increases to 3.2MPa, slightly expansion only occurs after gas vent.The increase of atomization pressure makes flow field velocity
It gradually increases, maximum speed increases to 674m/s by 615m/s, but air-flow field structure is substantially similar.Not with common gas spray pipe
Together, Laval nozzle atomizer does not occur so-called " closing vortex structure " in pressure increase.This is because convergent-divergent channel contraction-
The special construction of expansion, sufficiently expansion accelerates gas in pipe, and high-speed gas is tangentially sprayed along outlet, is not re-formed
Periodic expansion-compression wave.When atomizing pressure is lower, the static pressure variation in recirculating zone is smaller, is maintained at 70-
The lower value of 80KPa, when atomizing pressure reaches 8MPa, the static pressure at draft tube outlets reaches 110KPa, due to Lavalle
Critical atomization air pressure can be substantially improved in the expansion characteristics of jet pipe.Due to Joule-Thomson effect, with gradually adding for gas
Speed, temperature declines after gas expansion, and minimum temperature is reduced with the increase of atomization air pressure, when atomization air pressure is increased by 1.7MPa
When to 3.2MPa, flow field temperature is reduced to 70.5K by 108.4K.The speed of gas point in pressure, temperature and flow field in flow field
Cloth trend is exactly the opposite, i.e., the bigger region of speed, corresponding temperature and pressure are lower.There are a speed below diversion pipe
The inverted cone shape gas backstreaming area being negative, for maximum speed up to 250m/s, it is by the infrasound at supersonic airstream edge in recirculating zone
A kind of fast gas turbulence structure that reverse reflux is formed under pressure difference effect.
Temperature T is promoted by 300K to 400K, the maximum speed in flow field increases 100m/s, and amplification is up to 15.3%, flow field
Speed almost linearly increases with gas temperature, while the temperature in flow field also has promotion.Therefore, for the molten of identical mass flowrate
Body can obtain bigger gas kinetic energy by improving atomizing air temperature, reduce atomized powder average particle size.Change gas
Temperature will not cause the variation for being atomized flow field structure, only will affect the size of flow field velocity and the height of temperature.
When the hole heart of gas spout is away from respectively 10.4mm and 19.4mm, with the nozzle holes heart away from increase, flow field is maximum
Speed decreases, and drops to 623m/s from 645m/s, and speed increases in recirculating zone, and range significantly increases, the area of speed flowing field
Domain also increases.The gas spout hole heart can significantly affect the static pressure at draft tube outlets away from D, as the gas spout hole heart is away from increasing
Add, recirculating zone static pressure is gradually reduced, and when the value increases to 19.4mm, static pressure does not continue to reduce when dropping to 69KPa or so, becomes
In stabilization.From promote melt smoothly flow out aspect for, increase the nozzle holes heart away from be conducive to increase swabbing pressure, promotion melt flow
Out；From being promoted for atomization melt crushing efficiency angle, the reduction of flow field velocity and flow field regions increase are unfavorable for gas energy
It quickly concentrates and acts on melt, therefore the gas spout hole heart should be controlled away from unsuitable too small or excessive.
With the increase of gas injection angle, high-speed gas meet below diversion pipe back reflection effect enhancing, recirculating zone
It is compressed, shows as forming stronger back wave and mach disk.The speed in flow field also increased with the increase of the angle, from
618m/s increases to 635m/s.Static pressure is dramatically increased with the increase of gas injection angle in recirculating zone, works as jet angle
When degree increases to 35 ° and 40 °, static pressure has respectively reached 116.7KPa and 175.4KPa in recirculating zone, has been more than a mark
Quasi- atmospheric pressure, melt flows will be hindered at this time.Therefore in order to enable fluid smoothly to leave, and gas is allowed preferably to concentrate work
It is after comprehensive analysis that the control of gas injection angle is more appropriate at 30 ° or so for melt.
The size of recirculating zone can be compressed by increasing diversion pipe extension elongation.When extension elongation increases to 12mm by 0mm, flow field
The influence that speed slightly increases from 618m/s to 633m/s, to entire flow field structure is little.Water conservancy diversion length of tube mainly influences in recirculating zone
Pressure distribution, with being continuously increased for water conservancy diversion length of tube, under different atomizing pressures, the static pressure in recirculating zone has
Fall before rear increased trend.Atomizing pressure is bigger, and the amplitude of decline is also bigger.When atomization air pressure is 3.6MPa, recirculating zone
Interior pressure by diversion pipe extension elongation be 0mm when 117.3KPa have decreased to 53.8KPa, decrease by 54.1%.Therefore certain journey
Increasing diversion pipe overhang on degree can be significantly reduced the static pressure in recirculating zone, to obtain bigger swabbing pressure.
Claims (6)
1. a kind of design method of supersonic speed Laval nozzle constructional alloy melt atomization device, it is characterised in that pass through research ultrasound
Fast Lavalle wall surface curve, it is quasi- according to swabbing pressure criterion, close coupling criterion and flow field velocity in conjunction with the characteristics of close coupling atomization
Then, using cfdrc analog study atomization air pressure, atomizing air temperature, the gas spout hole heart away from, gas injection
The influence of angle and diversion pipe extension elongation convection current field structure, optimizes nozzle structural parameters, and gas is avoided to return
It flows and regurgitates, improve nebulization efficiency efficiency and silty amount processed；The gas spray pipe passes through the sectional view of nozzle center's axially bored line
In, the center line extended line and diversion pipe centre bore axis in Lavalle curve circumferential weld channel are crossed to form angle α, and as gas sprays
Firing angle degree, α are 0-60 °.
2. according to the design method of claim (1) the supersonic speed Laval nozzle constructional alloy melt atomization device, feature
It is, in sectional view of the gas spray pipe by nozzle center's axially bored line, the width and axis of the contraction section AB curve
It is 1:1-1:4 to length ratio.
3. according to the design method of claim (1) the supersonic speed Laval nozzle constructional alloy melt atomization device, feature
It is in section of the gas spray pipe by nozzle center's axially bored line, the expansion where the dilation curve BC and CD
Partial axial width least part is throat diameter A0, is exported out as outlet diameter A2, wherein A2/A0 by design horse
Conspicuous number determines that A2/A0 value is 4:1-16:1.
4. according to the design method of claim (1) the supersonic speed Laval nozzle constructional alloy melt atomization device, feature
Be the diversion pipe extension elongation expression is the length that draft tube outlets are stretched out relative to gas vent platform, length value
For 0-20mm.Water conservancy diversion bore 4-12mm, diversion pipe terminal end shape are round or rectangular.
5. according to the design method of claim (1) the supersonic speed Laval nozzle constructional alloy melt atomization device, feature
It is that the gas spout hole heart away from expression is that the center of gas vent circumferential weld is formed by the hole heart away from value 20-
80mm。
6. according to the design method of claim (1) the supersonic speed Laval nozzle constructional alloy melt atomization device, feature
It is described, the supersonic speed circumferential weld nozzle atomization powder main technologic parameters and range of design are as follows: atomization pressure 1-
10MPa, 27-500 DEG C of atomizing air temperature, gaseous species be nitrogen, argon gas, air, 0-400 DEG C of melt superheat degree, melt flow
Measure 0.05-1.00Kg/min.
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| CN110480023A (en) * | 2019-09-06 | 2019-11-22 | 飞而康快速制造科技有限责任公司 | Manufacture powder atomizer and nozzle and manufacture powder atomization method |
| CN110899713A (en) * | 2019-12-20 | 2020-03-24 | 北京机科国创轻量化科学研究院有限公司 | Novel close coupling gas atomizing nozzle |
| CN111730060A (en) * | 2020-04-29 | 2020-10-02 | 北京矿冶科技集团有限公司 | Atomizing spray plate and method for preparing alloy powder with narrow particle size for additive manufacturing through gas atomization |
| CN113145853A (en) * | 2021-04-22 | 2021-07-23 | 鞍钢股份有限公司 | Gas atomization preparation device and method for spherical metal powder |
| CN113355753A (en) * | 2021-06-22 | 2021-09-07 | 嘉兴学院 | Supersonic speed spinning nozzle structure |
| CN117291116A (en) * | 2023-09-26 | 2023-12-26 | 西南交通大学 | Design method of pasture fly sowing structure and pasture fly sowing tower |
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