CN114857621B - Atomizing jet nozzle device and atomizing method for high-pressure non-Newtonian fluid - Google Patents
Atomizing jet nozzle device and atomizing method for high-pressure non-Newtonian fluid Download PDFInfo
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- CN114857621B CN114857621B CN202210494804.6A CN202210494804A CN114857621B CN 114857621 B CN114857621 B CN 114857621B CN 202210494804 A CN202210494804 A CN 202210494804A CN 114857621 B CN114857621 B CN 114857621B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/04—Air inlet arrangements
- F23R3/10—Air inlet arrangements for primary air
- F23R3/12—Air inlet arrangements for primary air inducing a vortex
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention provides an atomization jet nozzle device and an atomization method for high-pressure non-Newtonian fluid. The utility model provides a novel energy-saving type cyclone, including shell, Z type cyclone, inner shell, Z type cyclone, groove runner, inner hole, jet orifice outlet, straight face installation end, inclined face installation end and inner wall, wherein the oxidant jet orifice is evenly arranged on the circumferencial direction of shell, the bottom of oxidant jet orifice is equipped with the jet orifice export, the inner installation end of shell is connected with the outer installation end of inner shell, the position that the inner shell is inside near the top is equipped with straight face installation end, straight face installation end and Z type cyclone are connected, the position that the inner shell is inside near the bottom is equipped with the inclined face installation end, the inclined face installation end is connected with the groove runner, the middle part of Z type cyclone and groove runner is equipped with the hole, the top of hole is equipped with the axle center oxidant entry, the bottom of hole is equipped with the axle center oxidant export, the bottom of groove runner is equipped with the whirl nozzle export, the outer wall of Z type cyclone evenly is equipped with Z type cyclone entry. The invention reduces the flow resistance of the non-Newtonian fluid, improves the flow speed, and obtains the optimal flow speed, thereby reducing the residence time in the nozzle.
Description
Technical Field
The invention relates to the field of jet nozzles, in particular to an atomization jet nozzle device and an atomization method for high-pressure non-Newtonian fluid.
Background
Liquid jets find important application in a wide variety of industries, such as in power plants including oil-fired boilers, internal combustion engines, gas turbines, air-breathing engines, and rocket engines, where liquid fuels are atomized by jet injection through a nozzle prior to combustion. In recent years, a non-Newtonian fluid represented by a gel propellant has wider application prospect on a ramjet engine and a rocket engine as a fuel, and the gel propellant has the advantages of long storage time of a solid propellant, easy adjustment of the thrust of a liquid propellant and the like from the aspect of physical properties of the fluid, so that the gel propellant is a novel propellant with great prospect.
Atomizing jet nozzles are the core components that produce atomization, and the flow resistance of the non-newtonian fluid within the nozzle and the impact effect of the external jet device determine the effect of jet atomization. From the conditions resulting from the above-described jet atomization, it is known that the optimum atomization effect is related not only to the flow velocity of the non-newtonian fluid but also to the impact effect of the jet. However, in practical application, the atomization effect of the non-newtonian fluid in practical application is not ideal due to the high viscosity and nonlinear rheological property of the non-newtonian fluid, so that the atomization nozzle does not form a regular product until now, and the non-newtonian fluid is only applied to some special equipment.
For example, in patent 201711143593.7, the air flow path is divided into four swirl flow paths from inside to outside, and the fuel flow path is divided into a primary fuel flow path and a secondary fuel flow path; in both the 201420733445.6 and 201420547162.2 patents, two stages of cyclones are used in the axial direction to enhance the mixing of fuel and air and to improve the uniformity of the mixing of fuel and air at the outlet of the nozzle. According to analysis, the swirl channel is increased along the radial direction or the axial direction of the nozzle, and the mixing uniformity of fuel and air can be improved, but the flow resistance of non-Newtonian fluid is large, the atomization efficiency and the mist momentum are low, so that the fuel is insufficiently combusted after being mixed, and specific measures for preventing spontaneous combustion, tempering and the like are not adopted. In view of the above, the present invention provides an atomizing jet nozzle device and an atomizing method for a high-pressure non-newtonian fluid.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides an atomization jet nozzle device and an atomization method for high-pressure non-Newtonian fluid, which are characterized in that the structures of a Z-type cyclone inlet and a groove flow channel in a Z-type cyclone are designed, so that the non-Newtonian fluid generates cyclone flow, the flow resistance of the non-Newtonian fluid is reduced through the groove flow channel, the flow speed of the non-Newtonian fluid is improved, and the residence time in the nozzle is reduced; finally, the axis oxidant outlet and the oxidant ejected from the jet orifice outlet are subjected to two atomization collisions, so that the fog momentum of the whole atomization effect is improved.
The invention provides an atomization jet nozzle device for high-pressure non-Newtonian fluid, which comprises an outer shell, an inner shell and a Z-shaped cyclone, wherein oxidant spray holes are uniformly formed in the circumferential direction of the outer shell, spray hole outlets are formed in the bottoms of the oxidant spray holes, an inner mounting end of the outer shell is connected with an outer mounting end of the inner shell, a straight surface mounting end is arranged at a position, close to the top, of the inner shell, the straight surface mounting end is connected with the Z-shaped cyclone, an inclined surface mounting end is arranged at a position, close to the bottom, of the inner shell, the inclined surface mounting end is connected with a groove flow channel, inner holes are formed in the middle parts of the Z-shaped cyclone and the groove flow channel, an axial oxidant inlet is formed in the tops of the inner holes, an axial oxidant outlet is formed in the bottoms of the inner holes, a cyclone nozzle outlet is formed in the bottoms of the groove flow channel, and a Z-shaped cyclone inlet is uniformly formed in the outer wall of the Z-shaped cyclone.
The Z-shaped cyclone inlet on the Z-shaped cyclone enables non-Newtonian fluid to generate cyclone flow, so that the flow speed of the non-Newtonian fluid is improved, the ridge line of the Z-shaped cyclone inlet is of a cyclone line structure, and the specific expression of the ridge line of the cyclone line structure is as follows:
wherein x is the abscissa of the plane in which the ridge line of the rotation line is located; y is the ordinate of the plane in which the ridge line of the rotation line is located; alpha is the deflection angle of the rotation line; r is the radius of the rotation line;
according to the distribution form of the Z-shaped cyclone inlets on the Z-shaped cyclone, the cyclone number N of the Z-shaped cyclone inlets on the Z-shaped cyclone is determined, and the specific expression is as follows:
N＝U/V
wherein U is the maximum tangential velocity on the jet characteristic surface in the cyclone; v is the maximum axial velocity component in the cyclone;
for the distribution and the cyclone number N of the inlets of the Z-shaped cyclone on the Z-shaped cyclone, the cyclone strength S of the inlets of the Z-shaped cyclone on the Z-shaped cyclone is determined, whether the actual use requirements are met or not is judged according to the cyclone strength S, and the specific expression is as follows:
in the method, in the process of the invention,
r 0 is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, alpha is the included angle between the cyclone and the axial direction, R pj For the radius of rotation of the air flow through the axial swirler, +.>
r 0 Is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, A is the flow cross section of an outlet, A 0 Cyclone outlet cross-sectional area.
Preferably, the nozzle outlet and the swirl nozzle outlet form a mixing area, the Z-type swirler, the inner shell and the groove runner form a swirl runner, and the mixing area is located at the lower end of the swirl runner.
Preferably, the number of the oxidant spray holes is eight, and the spray hole outlet and the jet flow of the axial oxidant outlet intersect at a point.
Preferably, the included angle beta between the axis of the oxidant spray hole and the axis of the axis oxidant outlet is 30-60 degrees, and the included angle alpha between the swirl nozzle outlet and the vertical direction of the device is 30-50 degrees.
Preferably, the ridge line angle of the Z-shaped cyclone inlet on the Z-shaped cyclone is within 30-60 degrees, and the semicircular diameter on the channel wall of the groove is 2mm.
In another aspect of the present invention, there is provided an atomization method for an atomization jet nozzle device for a high pressure non-newtonian fluid, comprising the steps of:
s1, designing an included angle beta between the axis of an oxidant spray hole and the axis of an axial oxidant outlet and the oxidant spray hole according to a required atomization cone angle;
s2, carrying out circular array on a certain number of oxidant spray holes along the axis of the shell according to a preset atomization effect;
s3, performing simulation on the non-Newtonian fluid on a fluid simulation platform Fluent, setting each structural parameter of the cyclone according to a simulation result, and setting the adjustable parameter as a global variable;
s4, on the basis of S3, respectively giving the pressure of the non-Newtonian fluid at the inlet of the Z-type cyclone, the pressure of the oxidant at the oxidant inlet of the axis and the pressure of the oxidant spray hole inlet;
s5, the non-Newtonian fluid generates a rotation flow velocity which prevents blockage through the Z-shaped cyclone and flows into the groove flow channel, the flow resistance of the non-Newtonian fluid is reduced through the groove flow channel, and the non-Newtonian fluid flows out from the outlet of the cyclone nozzle;
s6, performing first atomization collision between the non-Newtonian fluid flowing out of the swirl nozzle outlet and the oxidant sprayed out of the axis oxidant outlet, and adjusting the pressure of the axis oxidant inlet in real time according to the required mist momentum;
s7, performing secondary atomization collision on the oxidant ejected from the oxidant nozzle and the atomized liquid drops generated in the S6;
s8, after secondary atomization collision in the mixing area, using the Soxhlet average diameter SMD as an index for measuring atomization quality, wherein the expression is as follows:
wherein: mu (mu) f Viscosity, sigma, of the movement of a non-Newtonian fluid f Is the tension of the surface of the non-Newtonian fluid, G f Is the flow rate of the non-Newtonian fluid, deltaP f Is the pressure drop of a non-newtonian fluid.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, by means of a bionic drag reduction technology, the shark scale drag reduction structure is applied to the spiral groove flow channel in the nozzle, so that the flow resistance of the non-Newtonian fluid is effectively reduced, and the flow speed is improved.
2. The Z-shaped cyclone can enable the non-Newtonian fluid to generate cyclone flow, and the annular groove type flow channel in the cyclone nozzle is beneficial to reducing the flow resistance of the non-Newtonian fluid, improving the flow speed of the non-Newtonian fluid, obtaining the optimal flow speed, and further reducing the residence time in the nozzle.
3. According to the invention, through adjusting the inlet pressure of the axis oxidant pipeline to cooperate with the 8 outer wall oxidant spray holes, the non-Newtonian fluid can obtain better atomization effect after the collision of the mixing section, and the mist momentum of the overall atomization effect can be improved.
4. The high-speed jet flow generated at the outlet of the axis oxidant pipeline on the Z-type cyclone can improve the overall fog momentum, so that the atomization is more sufficient and the jet flow atomization distance is longer; at the same time, the flashback risk can be reduced because the fuel and oxidant mixture accelerates out of the swirl nozzle.
5. The invention has reasonable structure, easy production, high working efficiency and practicability.
Drawings
FIG. 1 is an isometric view of an atomizing jet nozzle apparatus for a high pressure non-Newtonian fluid of the present invention;
FIG. 2 is a cross-sectional view of a nozzle in an atomizing jet nozzle apparatus for high pressure non-Newtonian fluids according to the present invention;
FIG. 3 is an isometric view of a Z-type cyclone in an atomizing jet nozzle apparatus for high pressure non-Newtonian fluids of the present invention;
FIG. 4 is a simulated flow diagram of the interior of a non-Newtonian fluid atomizing jet nozzle in an atomizing jet nozzle apparatus for high pressure non-Newtonian fluids according to the present invention;
the main reference numerals:
the device comprises an outer shell 1, oxidant spray holes 2, an inner shell 3, a grooved runner 4,Z type cyclone 5, an inner hole 6, a Z-shaped cyclone inlet 7, an axial oxidant inlet 8, an axial oxidant outlet 9, a cyclone nozzle outlet 10, a spray hole outlet 11 and a mixing area 12.
Detailed Description
In order to make the technical content, the structural features, the achieved objects and the effects of the present invention more detailed, the following description will be taken in conjunction with the accompanying drawings.
An atomized jet nozzle device for high pressure non-newtonian fluids, as shown in figures 1 to 3, comprises an outer housing 1, an inner housing 3 and a Z-type cyclone 5.
The oxidant spray holes 2 are uniformly formed in the circumferential direction of the shell 1, and the oxidant spray holes 2 are used for collision between fuel and oxidant to improve atomization effect and reduce spontaneous combustion and tempering risks; the bottom of oxidant orifice 2 is equipped with orifice export 11, and the internally mounted end of shell 1 is connected with the externally mounted end of inner shell 3, and the inside position that is close to the top of inner shell 3 is equipped with the straight face installation end, and the straight face installation end is connected with Z formula swirler 5, and the inside position that is close to the bottom of inner shell 3 is equipped with the inclined plane installation end, and the inclined plane installation end is connected with slot runner 4.
As shown in fig. 4, the middle parts of the Z-type cyclone 5 and the groove flow channel 4 are provided with an inner hole 6, the top of the inner hole 6 is provided with an axial oxidant inlet 8, the bottom of the inner hole 6 is provided with an axial oxidant outlet 9, the inner hole 6 can improve the mist momentum and atomization effect of the overall fuel mixture by improving the speed of the oxidant in the hanging furnace, the bottom of the groove flow channel 4 is provided with a cyclone nozzle outlet 10, and the nozzle outlet 10 reduces the risk of backfire due to the accelerated outflow of the fuel and the oxidant and is used for improving the mist momentum and atomization effect of the overall fuel mixture; the outer wall of the Z-shaped cyclone 5 is uniformly provided with Z-shaped cyclone inlets 7.
Preferably, as shown in fig. 3, the spray hole outlet 11 and the swirl nozzle outlet 10 form a mixing area 12, the z-type swirler 5, the inner shell 3 and the groove runner 4 form a swirl runner, and the mixing area 12 is located at the lower end of the swirl runner.
The Z-shaped cyclone inlet 7 on the Z-shaped cyclone 5 enables the non-Newtonian fluid to generate cyclone flow, so that the flow speed of the non-Newtonian fluid is improved, the ridge line of the Z-shaped cyclone inlet 7 is in a cyclone line structure, and the specific expression of the ridge line of the cyclone line structure is as follows:
wherein x is the abscissa of the plane in which the ridge line of the rotation line is located; y is the ordinate of the plane in which the ridge line of the rotation line is located; alpha is the deflection angle of the rotation line; r is the radius of the rotation line.
Specifically, in the potential flow rotation region on the Z-type cyclone 5, the closer to the center of the cyclone in the radial direction on the Z-type cyclone 5, the lower the fluid pressure; in the solid-like rotation zone on the Z-cyclone 5, the pressure in this zone is lower than the potential flow rotation zone pressure and thus also lower than the peripheral wall-fixing pressure. When the pressure of the rotation center is lower than the external atmospheric pressure, the external fluid can be ejected into the cyclone.
When external fluid is injected into the cyclone, the expression of the pressure distribution of the upper core area of the Z-shaped cyclone 5 is as follows:
P＝ρw 2 r 2 /2+C
where ρ is the density of the non-Newtonian fluid, ω is the rotational velocity of the non-Newtonian fluid, r is the radius of the core region on the Z-type cyclone 5, and C is the integration constant.
According to the distribution form of the Z-shaped cyclone inlets 7 on the Z-shaped cyclone 5 and the external pressure, the cyclone number N of the Z-shaped cyclone inlets 7 on the Z-shaped cyclone 5 is determined, and the specific expression is as follows:
N＝U/V
wherein U is the maximum tangential velocity on the jet characteristic surface in the cyclone; v is the maximum axial velocity component in the cyclone;
the cyclone strength S of the Z-shaped cyclone inlets 7 on the Z-shaped cyclone 5 is determined according to the distribution of the Z-shaped cyclone inlets 7 on the Z-shaped cyclone 5 and the cyclone number N, and whether the actual use requirement is met or not is judged according to the cyclone strength S (the cyclone strength S is a dimensionless quantity formed by the ratio of rotational moment to axial moment).
The expression of the rotational moment M is as follows:
M＝ρQWR pj
wherein ρ is the density of the external fluid; q is the flow of the external fluid; w is the tangential velocity of the external fluid; r is R pj For the radius of rotation of the airflow through the axial swirler,
r 0 is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-shaped cyclone.
Wherein alpha is the included angle between the cyclone and the axial direction, Q is the flow of external fluid, A 0 Is the flow cross section of the outlet of the cyclone.
R pj The specific expression is as follows, for the average radius of rotation of the external fluid through the cyclone:
wherein r is 0 Is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-shaped cyclone.
The expression of the axial momentum K is as follows:
wherein ρ is the density of the external fluid, Q is the flow rate of the external fluid, and a is the cross-sectional area of the cyclone outlet.
From this, the expression of the swirl strength S is:
wherein M is the rotational moment of the airflow, and KL is the axial moment of the airflow.
Because the working area of the cyclone is a non-circular section channel, the equivalent diameter of the circular channel is converted into a qualitative size L under the condition that the sectional area of the channel is kept unchanged, and the specific expression of the cyclone strength S for the device is as follows:
in the method, in the process of the invention,
r 0 is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, alpha is the included angle between the cyclone and the axial direction, R pj For the radius of rotation of the air flow through the axial swirler, +.>
r 0 Is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, A is the flow cross section of an outlet, A 0 Cyclone outlet cross-sectional area.
In a preferred embodiment of the invention, the number of oxidant orifices 2 is eight, and the jets of orifice outlet 11 and axial oxidant outlet 9 intersect at a point. The included angle beta between the axis of the oxidant spray hole 2 and the axis of the axis oxidant outlet 9 is within 30-60 degrees, and the included angle alpha between the swirl nozzle outlet 10 and the vertical direction of the device is within 30-50 degrees.
The number of Z-shaped cyclone inlets 7 on the Z-shaped cyclone 5 is three, the ridge line angle of the Z-shaped cyclone inlets 7 is within 30-60 degrees, and the semicircle diameter on the channel wall 4 is 2mm.
Specifically, the fuel flows in a rotating manner through the Z-type swirler 5, is accelerated by the groove flow channel 4 through the swirl nozzle outlet 10, flows to the mixing region 12 at the lower end of the swirl flow channel, and meets and mixes with the oxidant ejected from the axial oxidant outlet 9 and the nozzle outlet 11 at the mixing region 12.
The invention is further described below with reference to an atomizing jet nozzle device and an atomizing method for a high pressure non-newtonian fluid by way of example:
the atomizing method for the atomizing jet nozzle device for the high-pressure non-Newtonian fluid comprises the following specific implementation steps of:
s1, designing an included angle beta between the axis of the oxidant spray hole 2 and the axis of the axis oxidant outlet 9, and specific structures and positions of the oxidant spray hole 2 and the nozzle outlet 10 according to a required atomization cone angle, an included angle range between the axis of the oxidant spray hole 2 and the axis of the axis oxidant outlet 9 and an included angle range between the nozzle outlet 10 and the vertical direction, so as to ensure the atomization effect of the whole fuel mixture.
S2, according to the preset atomization effect and strength, eight oxidant spray holes 2 are circularly arrayed along the axis of the shell 1.
S3, performing simulation on the non-Newtonian fluid on Fluent software (fluid simulation platform), setting each structural parameter of the cyclone according to simulation results, and setting the adjustable parameters as global variables.
S4, on the basis of S3, the pressure of the non-Newtonian fluid at the inlet 7 of the Z-type cyclone, the pressure of the oxidant at the oxidant inlet 8 of the axis and the pressure of the inlet of the oxidant spray hole 2 are respectively given.
S5, the non-Newtonian fluid flows into the groove flow channels 4 through the Z-shaped cyclone 5 at a high rotation flow speed, the flow resistance and the blocking performance of the non-Newtonian fluid are reduced through the groove flow channels 4, and the non-Newtonian fluid flows out of the cyclone nozzle outlet 10. The problem of flow resistance of the non-Newtonian fluid can be effectively reduced through the acceleration of the Z-shaped cyclone 5 and the resistance reduction of the groove flow channels 4.
The larger the bottom space of the groove flow channel 4 is, the higher the secondary vortex adhered to the groove flow channel 4 is lifted, the larger the thickness of the viscous bottom layer is, the better the drag reduction effect of the surface of the groove flow channel 4 is, the groove flow channel 4 obviously changes the turbulent flow field structure of the near wall area along with the increase of the flow direction distance, the spreading movement of the fluid in the near wall area is cut off due to the existence of the groove flow channel 4, the momentum exchange among fluid micro-clusters is inhibited, a large amount of low-speed stable fluid exists at the bottom of the groove flow channel 4, the relative movement of the fluid and the contact wall surface is smaller, and the generated friction resistance is lower; in contrast, since the smooth surface is free from the blocking of the groove wall, the fluid directly washes the flat surface, resulting in high frictional resistance. The grooved channels 4 are therefore subjected to a lower frictional resistance than the smooth planar surfaces.
S6, the non-Newtonian fluid flowing out of the swirl nozzle outlet 10 collides with the oxidant sprayed out of the axis oxidant outlet 9 in a first atomization mode, the pressure of the axis oxidant inlet 8 is regulated in real time according to the required mist quantity, and meanwhile the risk of tempering can be reduced.
S7, the oxidant spray hole 2 is arranged according to the atomization cone angle required by the S1, and the oxidant sprayed from the oxidant spray hole 2 collides with the atomized liquid drops generated in the S6 in a second atomization mode, so that the overall atomization effect is improved.
S8, after secondary atomization collision of the mixing area 12, the integrally generated atomized liquid drops are finer, the atomization effect is better, the liquid drop atomization effect is observed in the mixing area 12, and the index of atomization quality is measured by utilizing the Soxhlet average diameter SMD, wherein the expression is as follows:
wherein: mu (mu) f Viscosity, sigma, of the movement of a non-Newtonian fluid f Is the tension of the surface of the non-Newtonian fluid, G f Is the flow rate of the non-Newtonian fluid, deltaP f Is the pressure drop of a non-newtonian fluid.
Since the cyclone has the Z-shaped cyclone 5 and the groove flow channel 4, the fluid generates a pressure drop delta P corresponding to the faster flow speed f The average diameter of the Sout is increased, the overall atomization effect is reduced, and compared with a direct-current nozzle, the overall atomization effect is improved.
According to the atomization method, after the non-Newtonian fluid passes through the nozzle device, the rotating jet flow enables particles of the non-Newtonian fluid to rotate and advance at a higher speed to form diffusion, atomization is generated to a certain extent, a stable injection angle can be generated in a pressure range, meanwhile, compared with a traditional conical nozzle, the non-Newtonian fluid flow is improved by 30-40% due to the fact that the nozzle device is large in free cross section and the internal groove flow channel 4 is drag-reduced, a smooth movement track is formed, and the non-Newtonian fluid cannot be blocked.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. An atomized jet nozzle device for high-pressure non-Newtonian fluid, which comprises an outer shell, an inner shell and a Z-type cyclone, and is characterized in that,
the device comprises an outer shell, wherein an oxidant spray hole is uniformly formed in the circumferential direction of the outer shell, a spray hole outlet is formed in the bottom of the oxidant spray hole, an inner mounting end of the outer shell is connected with an outer mounting end of the inner shell, a straight surface mounting end is arranged at a position, close to the top, of the inner shell, the straight surface mounting end is connected with a Z-shaped cyclone, an inclined surface mounting end is arranged at a position, close to the bottom, of the inner shell, the inclined surface mounting end is connected with a groove flow channel, inner holes are formed in the middle of the Z-shaped cyclone and the groove flow channel, an axial oxidant inlet is formed in the top of the inner holes, an axial oxidant outlet is formed in the bottom of the inner holes, a cyclone nozzle outlet is formed in the bottom of the groove flow channel, and a Z-shaped cyclone inlet is uniformly formed in the outer wall of the Z-shaped cyclone;
the Z-shaped cyclone inlet on the Z-shaped cyclone enables non-Newtonian fluid to generate cyclone flow, so that the flow speed of the non-Newtonian fluid is improved, the ridge line of the Z-shaped cyclone inlet is of a cyclone line structure, and the specific expression of the ridge line of the cyclone line structure is as follows:
wherein x is the abscissa of the plane in which the ridge line of the rotation line is located; y is the ordinate of the plane in which the ridge line of the rotation line is located; alpha is the deflection angle of the rotation line; r is the radius of the rotation line;
according to the distribution form of the Z-shaped cyclone inlets on the Z-shaped cyclone, the cyclone number N of the Z-shaped cyclone inlets on the Z-shaped cyclone is determined, and the specific expression is as follows:
N＝U/V
wherein U is the maximum tangential velocity on the jet characteristic surface in the cyclone; v is the maximum axial velocity component in the cyclone;
for the distribution and the cyclone number N of the inlets of the Z-shaped cyclone on the Z-shaped cyclone, the cyclone strength S of the inlets of the Z-shaped cyclone on the Z-shaped cyclone is determined, whether the actual use requirements are met or not is judged according to the cyclone strength S, and the specific expression is as follows:
in the method, in the process of the invention,
r 0 is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, alpha is the deflection angle of the spiral, R pj For the radius of rotation of the air flow through the axial swirler, +.>
r 0 Is the inner radius of the Z-type cyclone, R 0 Is the outer radius of the Z-type cyclone, A is the flow cross section of an outlet, A 0 The outlet cross-sectional area of the cyclone;
the Z-shaped cyclone, the inner shell and the groove flow channel form a cyclone flow channel, and the mixing area is positioned at the lower end of the cyclone flow channel;
the fuel forms rotary flow through the Z-type cyclone, is accelerated by the groove flow channel through the outlet of the cyclone nozzle and flows to a mixing area at the lower end of the cyclone flow channel, and meets and mixes with the axial oxidant outlet and the oxidant sprayed out from the spray hole outlet at the mixing area; the Z-type cyclone and the groove flow channel enable the fluid to generate pressure drop delta P corresponding to faster flow speed f The increase in the sauter mean diameter decreases.
2. An atomizing jet nozzle apparatus for a high pressure non-newtonian fluid according to claim 1, wherein said oxidant nozzle orifice is eight in number, and said nozzle orifice outlet and said axial oxidant outlet jet intersect at a point.
3. An atomising jet nozzle device for high pressure non-newtonian fluids according to claim 1 or 3, wherein the angle β between the axis of the oxidant orifice and the axis of the axis oxidant outlet is in the range 30 ° to 60 °, and the angle α between the swirl nozzle outlet and the vertical direction of the device itself is in the range 30 ° to 50 °.
4. An atomizing jet nozzle apparatus for a high pressure non-newtonian fluid according to claim 1, wherein a ridge line angle of a Z-type cyclone inlet on the Z-type cyclone is within 30 ° to 60 °, and a semicircular diameter on a channel wall of the groove is 2mm.
5. A method of atomizing a spray nozzle assembly for atomizing a non-newtonian fluid under high pressure according to any one of claims 1-4, wherein the steps are carried out:
s1, designing an included angle beta between the axis of an oxidant spray hole and the axis of an axial oxidant outlet and the oxidant spray hole according to a required atomization cone angle;
s2, carrying out circular array on a certain number of oxidant spray holes along the axis of the shell according to a preset atomization effect;
s3, performing simulation on the non-Newtonian fluid on a fluid simulation platform, setting each structural parameter of the cyclone according to simulation results, and setting the adjustable parameters as global variables;
s4, on the basis of S3, respectively giving the pressure of the non-Newtonian fluid at the inlet of the Z-type cyclone, the pressure of the oxidant at the oxidant inlet of the axis and the pressure of the oxidant spray hole inlet;
s5, the non-Newtonian fluid generates a rotation flow velocity which prevents blockage through the Z-shaped cyclone and flows into the groove flow channel, the flow resistance of the non-Newtonian fluid is reduced through the groove flow channel, and the non-Newtonian fluid flows out from the outlet of the cyclone nozzle;
the larger the bottom space of the groove flow channel is, the higher the secondary vortex adhered to the groove flow channel is lifted, the larger the thickness of the viscous bottom layer is, the better the drag reduction effect of the surface of the groove flow channel is, the groove flow channel changes the turbulent flow field structure of the near wall area along with the increase of the flow direction distance, and due to the existence of the groove flow channel, the spreading movement of the fluid in the near wall area is cut off, the momentum exchange among fluid micro-groups is inhibited, so that a large amount of low-speed stable fluid exists at the bottom of the groove flow channel;
s6, performing first atomization collision between the non-Newtonian fluid flowing out of the swirl nozzle outlet and the oxidant sprayed out of the axis oxidant outlet, and adjusting the pressure of the axis oxidant inlet in real time according to the required mist momentum;
s7, performing secondary atomization collision on the oxidant ejected from the oxidant nozzle and the atomized liquid drops generated in the S6;
s8, after secondary atomization collision in the mixing area, using the Soxhlet average diameter SMD as an index for measuring atomization quality, wherein the expression is as follows:
wherein: mu (mu) f Viscosity, sigma, of the movement of a non-Newtonian fluid f Is the tension of the surface of the non-Newtonian fluid, G f Is the flow rate of the non-Newtonian fluid, deltaP f Is the pressure drop of a non-newtonian fluid.
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