CN114857621A - 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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- CN114857621A CN114857621A CN202210494804.6A CN202210494804A CN114857621A CN 114857621 A CN114857621 A CN 114857621A CN 202210494804 A CN202210494804 A CN 202210494804A CN 114857621 A CN114857621 A CN 114857621A
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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 atomizing jet nozzle device and an atomizing method for high-pressure non-Newtonian fluid. Evenly be equipped with the oxidant orifice on the circumferencial direction of shell, the bottom of oxidant orifice is equipped with the orifice export, the internally mounted end of shell and the externally mounted end of inner shell are connected, the position that the inside of inner shell is close to the top is equipped with straight face installation end, straight face installation end and Z type swirler are connected, the position that the inside of inner shell is close to the bottom is equipped with inclined plane installation end, inclined plane installation end and slot runner are connected, Z type swirler and slot runner's middle part is equipped with the hole, the top of hole is equipped with axle center oxidant entry, the bottom of hole is equipped with axle center oxidant export, the bottom of slot runner is equipped with the whirl nozzle export, the outer wall of Z type swirler evenly is equipped with Z type swirler entry. The invention reduces the flow resistance of the non-Newtonian fluid, improves the flow speed, obtains the optimal flow speed, and thereby reduces the retention 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 jet has important applications in many industrial fields, such as in power plants like oil boilers, internal combustion engines, gas, turbines, air breathing engines and rocket engines, where liquid fuel is atomized by means of a nozzle by means of liquid jet injection before combustion takes place. In recent years, non-Newtonian fluid represented by gel propellant has wider application prospect in ramjet engines and rocket engines as fuel, and the gel propellant has the advantages of long storage time of solid propellant, easy regulation of thrust of liquid propellant and the like from the physical property of fluid, so that the gel propellant is a novel propellant with great prospect.
The atomizing jet nozzle is a core component for generating atomization, and the flow resistance of the non-Newtonian fluid in the nozzle and the collision effect of an external jet device determine the effect of jet atomization. From the conditions generated by the above-described jet atomization, the optimum atomization effect is not only related to the flow velocity of the non-newtonian fluid but also to the collision effect of the ejector. However, in the practical application process, the atomization effect of the non-newtonian fluid in practical use is not ideal due to the high viscosity and the nonlinear rheological property of the non-newtonian fluid, so that the atomization nozzle is not a regular product so far, and 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 main stage fuel flow path and a secondary stage fuel flow path; in both patent 201420733445.6 and patent 201420547162.2, two stages of swirlers 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 nozzle outlet. Analysis shows that the nozzle can improve the mixing uniformity of fuel and air by adding the swirl channel along the radial direction or the axial direction, but the flow resistance of the non-Newtonian fluid is large, the atomization efficiency and the mist momentum are low, so that the fuel is not fully combusted after being mixed, and specific measures for preventing spontaneous combustion, tempering and the like are not provided. In order to solve the problems, the invention provides an atomization jet nozzle device and an atomization method for high-pressure non-Newtonian fluid.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an atomizing jet nozzle device and an atomizing method for high-pressure non-Newtonian fluid, the inlet of a Z-shaped swirler in the Z-shaped swirler and the structure of a groove flow channel are designed, so that the non-Newtonian fluid generates rotational flow type 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 retention time in the nozzle is reduced; finally, the oxidant ejected from the axis oxidant outlet and the orifice outlet is atomized and collided for two times, so that the mist momentum of the whole atomization effect is improved.
The invention provides an atomized jet nozzle device for high-pressure non-Newtonian fluid, which comprises an outer shell, an inner shell and a Z-shaped swirler, oxidant spray holes are uniformly arranged in the circumferential direction of the shell, spray hole outlets are arranged at the bottoms of the oxidant spray holes, the inner mounting end of the outer shell is connected with the outer mounting end of the inner shell, a straight mounting end is arranged at the position close to the top inside the inner shell, the straight surface mounting end is connected with the Z-shaped swirler, an inclined surface mounting end is arranged at the position close to the bottom inside the inner shell, the inclined plane mounting end is connected with the groove flow passage, the middle parts of the Z-shaped swirler and the groove flow passage are provided with inner holes, the top of the inner hole is provided with an axis oxidant inlet, the bottom of the inner hole is provided with an axis oxidant outlet, and a swirl nozzle outlet is arranged at the bottom of the groove flow channel, and Z-shaped swirler inlets are uniformly arranged on the outer wall of the Z-shaped swirler.
The Z-shaped swirler inlet on the Z-shaped swirler enables non-Newtonian fluid to generate rotational flow type flowing, so that the flowing speed of the non-Newtonian fluid is improved, the ridge line of the Z-shaped swirler inlet is of a spinning wheel line structure, and the specific expression of the ridge line of the spinning wheel line structure is as follows:
in the formula, x is the abscissa of the plane where the ridgeline of the cycloidal line is located; y is the ordinate of the plane where the camberline is located; alpha is the deflection angle of the gyroid line; r is the radius of the cycloid;
determining the cyclone number N of the Z-shaped cyclone inlet on the Z-shaped cyclone according to the distribution form of the Z-shaped cyclone inlet on the Z-shaped cyclone, wherein the specific expression is as follows:
N＝U/V
in the formula, U is the maximum tangential velocity on a jet characteristic surface in the cyclone; v is the maximum axial velocity component in the swirler;
to distribution and the spiral-flow number N of Z type swirler entry on the Z type swirler, confirm the whirl intensity S of Z type swirler entry on the Z type swirler, judge whether satisfy the in-service use demand according to whirl intensity S, the concrete expression is:
in the formula (I), the compound is shown in the specification,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped swirler, alpha is the included angle between the swirler and the axial direction, R pj The radius of rotation of the airflow through the axial swirler,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped cyclone, A is the flow cross-sectional area of the outlet, A 0 Cross section area of the outlet of the cyclone.
Preferably, the nozzle hole outlet and the swirl nozzle outlet form a mixing region, the Z-shaped swirler, the inner shell and the groove runner form a swirl runner, and the mixing region is located at the lower end of the swirl runner.
Preferably, the number of oxidant orifices is eight, and the jets of the orifice outlets and the axial oxidant outlet intersect at a point.
Preferably, an included angle beta between the axis of the oxidant nozzle hole and the axis of the oxidant outlet at the axis is within 30-60 degrees, and an included angle alpha between the outlet of the swirl nozzle and the vertical direction of the device is within 30-50 degrees.
Preferably, the crest line angle of the Z-shaped cyclone inlet on the Z-shaped cyclone is within 30-60 degrees, and the semi-circle diameter on the wall of the channel is 2 mm.
In another aspect of the present invention, an atomization method for an atomized jet nozzle device of high pressure non-newtonian fluid is provided, comprising the steps of:
s1, designing an included angle beta between the axis of the oxidant jet hole and the axis of the axis oxidant outlet and the oxidant jet hole according to the required atomization taper angle;
s2, according to a preset atomization effect, carrying out circular array on a certain number of oxidant spray holes along the axis of the shell;
s3, performing analog simulation on the non-Newtonian fluid on the fluid simulation platform Fluent, setting each structural parameter of the swirler according to the simulation result, and setting the adjustable parameter as a global variable;
s4, respectively setting the pressure of the non-Newtonian fluid at the inlet of the Z-shaped cyclone, the pressure of the oxidant at the inlet of the axial oxidant and the pressure of the oxidant jet hole on the basis of S3;
s5, enabling the non-Newtonian fluid to flow into the groove flow channel at a rotation flow speed which is generated by the Z-shaped swirler and is prevented from being blocked, reducing the flow resistance of the non-Newtonian fluid through the groove flow channel, and enabling the non-Newtonian fluid to flow out from the outlet of the swirl nozzle;
s6, carrying out primary atomization collision on the non-Newtonian fluid flowing out of the outlet of the swirl nozzle and the oxidant sprayed from the outlet of the axis oxidant, and adjusting the pressure of the inlet of the axis oxidant in real time according to the required atomization amount;
s7, carrying out secondary atomization collision on the oxidant jetted from the oxidant jet hole and the atomized liquid drops generated in the S6;
s8, after secondary atomization collision in the mixing area, using the Sott average diameter SMD as an index for measuring atomization quality, wherein the expression is as follows:
in the formula: mu.s f Viscosity, σ, being the movement of a non-Newtonian fluid f Is the surface tension of a non-Newtonian fluid, G f Is the flow rate, Δ P, of the non-Newtonian fluid f Is the pressure drop of the non-newtonian fluid.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, a shark scale resistance reduction structure is applied to a spiral groove flow channel in the nozzle through a bionic resistance reduction technology, so that the flow resistance of non-Newtonian fluid is effectively reduced, and the flow speed is improved.
2. The Z-shaped swirler can enable non-Newtonian fluid to generate rotational flow type flow, and the annular groove type flow channel in the swirl nozzle is beneficial to reducing the flow resistance of the non-Newtonian fluid, improving the flow speed of the non-Newtonian fluid and obtaining the optimal flow speed, so that the retention time in the nozzle is reduced.
3. According to the invention, through the synergistic effect of the inlet pressure of the axial oxidant pipeline and 8 outer wall oxidant jet holes, the non-Newtonian fluid can obtain a better atomization effect after the collision of the mixing section, and the mist momentum of the whole atomization effect can be improved.
4. The high-speed jet flow generated at the outlet of the axis oxidant pipeline on the Z-shaped swirler can improve the integral fog momentum and ensure that the atomizing is more sufficient and the jet flow atomizing distance is longer; and simultaneously, the fuel and oxidant mixture flows out of the swirl nozzle in an accelerating way, so that the risk of backfire can be reduced.
5. The invention has reasonable structure, easy production, high working efficiency and practicability.
Drawings
FIG. 1 is an isometric view of an atomizing fluidic nozzle device for high pressure non-Newtonian fluids in accordance with the present invention;
FIG. 2 is a cross-sectional view of a nozzle in the atomized jet nozzle assembly for high pressure non-Newtonian fluids of the present invention;
FIG. 3 is an isometric view of a Z-shaped swirler in an atomizing jet nozzle device for high pressure non-Newtonian fluids in accordance with the present invention;
FIG. 4 is a simulated flow diagram of the interior of a non-Newtonian fluid atomizing jet nozzle of the high pressure non-Newtonian fluid atomizing jet nozzle apparatus of the present invention;
the main reference numbers:
the device comprises an outer shell 1, oxidant spray holes 2, an inner shell 3, a groove flow channel 4, a Z-shaped swirler 5, an inner hole 6, a Z-shaped swirler inlet 7, an axis oxidant inlet 8, an axis oxidant outlet 9, a swirl nozzle outlet 10, a spray hole outlet 11 and a mixing area 12.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.
An atomised 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-shaped swirler 5.
As shown in fig. 4, the middle parts of the Z-shaped swirler 5 and the trench flow channel 4 are provided with an inner hole 6, the top of the inner hole 6 is provided with an axis oxidant inlet 8, the bottom of the inner hole 6 is provided with an axis oxidant outlet 9, the inner hole 6 can improve the overall fuel mixing fog momentum and atomization effect by increasing the speed of the oxidant in the hanging furnace, the bottom of the trench flow channel 4 is provided with a swirl nozzle outlet 10, and the nozzle outlet 10 reduces the risk of tempering due to the accelerated outflow of the fuel and the oxidant, so as to improve the overall fuel mixing fog momentum and atomization effect; z-shaped cyclone inlets 7 are uniformly arranged on the outer wall of the Z-shaped cyclone 5.
Preferably, as shown in fig. 3, the orifice outlet 11 and the swozzle outlet 10 constitute a mixing region 12, the Z-type swirler 5, the inner casing 3 and the trench flow passage 4 constitute a swirl flow passage, and the mixing region 12 is located at the lower end of the swirl flow passage.
Z type swirler entry 7 on Z type swirler 5 makes non-Newtonian fluid produce the rotational flow formula and flows to improve non-Newtonian fluid's velocity of flow, the crest line of Z type swirler entry 7 is the wheel line structure of circling round, and the concrete expression of the crest line of the wheel line structure of circling round is:
in the formula, x is the abscissa of the plane where the ridgeline of the cycloidal line is located; y is the ordinate of the plane where the camberline is located; alpha is the deflection angle of the gyroid line; r is the radius of the cycloid.
Specifically, in the potential flow rotating area on the Z-shaped cyclone 5, the closer to the center of the swirling flow in the radial direction on the Z-shaped cyclone 5, the lower the fluid pressure; in the solids-like rotational zone on the Z-cyclone 5, the pressure in this zone is lower than the potential flow rotational zone pressure and therefore also lower than the peripheral solid wall pressure. When the pressure of the rotation center is lower than the external atmospheric pressure, external fluid can be injected into the cyclone.
When external fluid is injected into the interior of the cyclone, the expression of the pressure distribution in the 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 speed of the non-Newtonian fluid, r is the radius of the core region on the Z-cyclone 5, and C is the integration constant.
According to the distribution form of the Z-shaped cyclone inlet 7 on the Z-shaped cyclone 5 and the external pressure, the cyclone number N of the Z-shaped cyclone inlet 7 on the Z-shaped cyclone 5 is determined, and the specific expression is as follows:
N＝U/V
in the formula, U is the maximum tangential velocity on a jet characteristic surface in the cyclone; v is the maximum axial velocity component in the swirler;
and determining the swirl strength S of the Z-shaped swirler inlet 7 on the Z-shaped swirler 5 according to the distribution of the Z-shaped swirler inlet 7 on the Z-shaped swirler 5 and the swirl number N, and judging whether the actual use requirement is met according to the swirl strength S (the swirl strength S is a dimensionless quantity formed by the ratio of the rotational momentum moment to the axial momentum moment).
The expression of the moment of rotational momentum M is as follows:
M＝ρQWR pj
in the formula, rho is the density of the external fluid; q is the flow rate of the external fluid; w is the tangential velocity of the external fluid; r pj The radius of rotation of the airflow through the axial swirler,
r 0 is the inner radius of the Z-shaped swirler, R 0 The outer radius of the Z-shaped cyclone.
Wherein, alpha is the included angle between the swirler and the axial direction, Q is the flow rate of the external fluid, A 0 Is the flow cross section area of the outlet of the cyclone.
R pj The specific expression is that the average radius of rotation of the external fluid passing through the cyclone is as follows:
in the formula, r 0 Is the inner radius of the Z-shaped swirler, R 0 The outer radius of the Z-shaped cyclone.
The expression for the axial momentum K is as follows:
in the formula, rho is the density of the external fluid, Q is the flow rate of the external fluid, and A is the sectional area of the outlet of the cyclone.
From this, the expression of swirl strength S is:
in the formula, M is the airflow rotation momentum moment, and KL is the airflow axial momentum moment.
Because the working area of the cyclone is a non-circular section channel, the channel should be converted into the equivalent diameter of a circular channel as a qualitative size L under the condition of keeping the sectional area of the channel unchanged, and the specific expression of the swirl strength S for the device disclosed by the invention is as follows:
in the formula (I), the compound is shown in the specification,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped swirler, alpha is the included angle between the swirler and the axial direction, R pj The radius of rotation of the airflow through the axial swirler,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped cyclone, A is the flow cross-sectional area of the outlet, A 0 Cross section area of the outlet of the cyclone.
In a preferred embodiment of the invention, the number of oxidant orifices 2 is eight, the jets of orifice outlets 11 and axial oxidant outlet 9 intersecting at a point. The included angle beta between the axis of the oxidant jet hole 2 and the axis of the oxidant outlet 9 at the axis is within 30-60 degrees, and the included angle alpha between the outlet 10 of the swirl nozzle and the vertical direction of the device is within 30-50 degrees.
The number of Z-shaped swirler inlets 7 on the Z-shaped swirler 5 is three, the ridge line angle of the Z-shaped swirler inlets 7 is within 30-60 degrees, and the diameter of a semicircle on the channel wall 4 of the groove is 2 mm.
Specifically, the fuel is swirled by the Z-swirler 5, accelerated by the gutter flow channel 4 through the swirler exit 10, flows to the mixing zone 12 located at the lower end of the swirler flow channel, and meets and mixes with the oxidizer injected from the axial center oxidizer outlet 9 and the nozzle hole exit 11 at the mixing zone 12.
The atomizing jet nozzle device and the atomizing method for high-pressure non-Newtonian fluid of the present invention are further described with reference to the following examples:
the atomization method of the atomization jet nozzle device for the high-pressure non-Newtonian fluid comprises the following specific implementation steps:
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 the required atomization taper angle, the included angle range between the axis of the oxidant spray hole 2 and the axis of the axis oxidant outlet 9 and the included angle range between the nozzle outlet 10 and the vertical direction, and ensuring the atomization effect of the whole fuel mixture.
And S2, circularly arraying the eight oxidant jet holes 2 along the axis of the shell 1 according to preset atomization effect and intensity.
And S3, performing analog simulation on the non-Newtonian fluid on Fluent software (a fluid simulation platform), setting all structural parameters of the cyclone according to a simulation result, and setting the adjustable parameters as global variables.
S4, in addition to S3, the pressure of the non-newtonian fluid at the inlet 7 of the Z-swirler, the pressure of the oxidant at the axial oxidant inlet 8, and the pressure at the inlet of the oxidant nozzle 2 are respectively specified.
S5, the non-Newtonian fluid flows into the groove flow channel 4 through the Z-shaped swirler 5 at a high rotational flow speed, the flow resistance and the blocking performance of the non-Newtonian fluid are reduced through the groove flow channel 4, and the non-Newtonian fluid flows out from the swirl nozzle outlet 10. The problem of non-Newtonian fluid flow resistance can be effectively reduced by the acceleration of the Z-shaped swirler 5 and the resistance reduction of the groove flow channel 4.
The larger the bottom distance of the groove flow channel 4 is, the higher the secondary vortex attached 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 turbulent flow field structure of the near-wall area is obviously changed along with the increase of the flow direction distance of the groove flow channel 4, and due to the existence of the groove flow channel 4, the spanwise movement of the fluid in the near-wall area is cut off, the momentum exchange among fluid micro-clusters is inhibited, so that a large amount of low-speed stable fluid exists at the bottom of the groove flow channel 4, the relative movement between the fluid and the contact wall surface is small, and the generated friction resistance is low; correspondingly, as the smooth surface is not blocked by the groove wall, the fluid directly scours the plane, and high frictional resistance is generated. Therefore, the frictional resistance to the grooved flow channels 4 is lower than that of the smooth flat surface.
S6, carrying out primary atomization collision on the non-Newtonian fluid flowing out of the swirl nozzle outlet 10 and the oxidant sprayed from the axis oxidant outlet 9, adjusting the pressure of the axis oxidant inlet 8 in real time according to the required atomization amount, and reducing the risk of tempering.
And S7, the oxidant injection holes 2 are arranged according to the atomization cone angle required by the S1, and the oxidant injected from the oxidant injection holes 2 and the atomized liquid drops generated in the S6 are subjected to secondary atomization collision, so that the overall atomization effect is improved.
S8, after secondary atomization collision in the mixing area 12, enabling the integrally generated atomized liquid drops to be finer and better in atomization effect, observing the atomization effect of the liquid drops in the mixing area 12, and measuring the index of the atomization quality by using the Sott average diameter SMD, wherein the expression is as follows:
in the formula: mu.s f Viscosity, σ, being the movement of a non-Newtonian fluid f Is the surface tension of a non-Newtonian fluid, G f Is the flow rate of the non-newtonian fluid,ΔP f is the pressure drop of the non-newtonian fluid.
The cyclone is provided with the Z-shaped cyclone 5 and the groove flow channel 4, so that the pressure drop delta P corresponding to the higher flow speed of the fluid is generated f The increase, the sauter mean diameter reduces, and the whole atomization effect is improved to some extent compared with the straight-flow nozzle.
According to the atomization method, after the non-Newtonian fluid passes through the nozzle device, the mass point of the non-Newtonian fluid rotates and advances at a high speed by rotating jet flow, diffusion is formed, atomization to a certain degree is generated, a stable injection angle can be generated in a pressure range, and meanwhile compared with the traditional conical nozzle, the integral performance of the flow of the non-Newtonian fluid is improved by 30-40% due to the large free cross section of the nozzle device and the resistance reduction of the internal groove flow channel 4, a smooth motion track is formed, and the non-Newtonian fluid cannot be blocked.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (6)
1. An atomized jet nozzle device for high-pressure non-Newtonian fluid, which comprises an outer shell, an inner shell and a Z-shaped swirler, and is characterized in that,
oxidant spray holes are uniformly formed in the outer shell in the circumferential direction, 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, inside the inner shell, and connected with the Z-shaped cyclone, an inclined surface mounting end is arranged at a position, close to the bottom, inside the inner shell, and connected with the groove flow channel, inner holes are formed in the middle parts of the Z-shaped cyclone and the groove flow channel, an axis oxidant inlet is formed in the top of each inner hole, an axis oxidant outlet is formed in the bottom of each inner hole, a swirl nozzle outlet is formed in the bottom of the groove flow channel, and Z-shaped cyclone inlets are uniformly formed in the outer wall of the Z-shaped cyclone;
the Z-shaped swirler inlet on the Z-shaped swirler enables non-Newtonian fluid to generate rotational flow type flowing, so that the flowing speed of the non-Newtonian fluid is improved, the ridge line of the Z-shaped swirler inlet is of a spinning wheel line structure, and the specific expression of the ridge line of the spinning wheel line structure is as follows:
wherein, x is the abscissa of the plane where the ridgeline of the cycloidal line is positioned; y is the ordinate of the plane where the camberline is located; the alpha is the deflection angle of the gyroid line; r is the radius of the cycloid;
determining the cyclone number N of the Z-shaped cyclone inlet on the Z-shaped cyclone according to the distribution form of the Z-shaped cyclone inlet on the Z-shaped cyclone, wherein the specific expression is as follows:
N＝U/V
in the formula, U is the maximum tangential velocity on a jet characteristic surface in the cyclone; v is the maximum axial velocity component in the swirler;
to distribution and the spiral-flow number N of Z type swirler entry on the Z type swirler, confirm the whirl intensity S of Z type swirler entry on the Z type swirler, judge whether satisfy the in-service use demand according to whirl intensity S, the concrete expression is:
in the formula (I), the compound is shown in the specification,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped cyclone, alpha is the deflection angle of the cycloidal line, R pj The radius of rotation of the airflow through the axial swirler,
r 0 is the inner radius of the Z-shaped swirler, R 0 Is the outer radius of the Z-shaped cyclone, A is the flow cross-sectional area of the outlet, A 0 Cross section area of the outlet of the cyclone.
2. The atomizing fluidic nozzle device for high-pressure non-Newtonian fluids of claim 1, wherein said orifice outlet and said swozzle outlet constitute a mixing region, said Z-swirler, said inner shell and said channel flow channel constitute a swirl flow channel, said mixing region being located at a lower end of said swirl flow channel.
3. An atomizing jet nozzle device for high pressure non-Newtonian fluids according to claim 1, wherein said number of oxidant orifices is eight, the jets of said orifice outlets and said axial oxidant outlet intersecting at a point.
4. An atomiser 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 axial oxidant outlet is within 30 ° to 60 °, and the angle α between the swirl nozzle outlet and the vertical direction of the device itself is within 30 ° to 50 °.
5. An atomised jet nozzle device for high pressure non-newtonian fluids according to claim 1, wherein the angle of the ridgeline of the inlet of the Z-swirler on the Z-swirler is within 30 ° to 60 ° and the semi-circle diameter on the wall of the channel is 2 mm.
6. A method of atomizing a high pressure non-Newtonian fluid atomizing nozzle arrangement in accordance with any one of claims 1 to 5, further comprising the steps of:
s1, designing an included angle beta between the axis of the oxidant jet hole and the axis of the axis oxidant outlet and the oxidant jet hole according to the required atomization taper angle;
s2, according to a preset atomization effect, carrying out circular array on a certain number of oxidant spray holes along the axis of the shell;
s3, performing analog simulation on the non-Newtonian fluid on the fluid simulation platform, setting each structural parameter of the swirler according to the simulation result, and setting the adjustable parameter as a global variable;
s4, respectively setting the pressure of the non-Newtonian fluid at the inlet of the Z-shaped cyclone, the pressure of the oxidant at the inlet of the axial oxidant and the pressure of the oxidant jet hole on the basis of S3;
s5, enabling the non-Newtonian fluid to flow into the groove flow channel at a rotation flow speed which is generated by the Z-shaped swirler and is prevented from being blocked, reducing the flow resistance of the non-Newtonian fluid through the groove flow channel, and enabling the non-Newtonian fluid to flow out from the outlet of the swirl nozzle;
s6, carrying out primary atomization collision on the non-Newtonian fluid flowing out of the outlet of the swirl nozzle and the oxidant sprayed from the outlet of the axis oxidant, and adjusting the pressure of the inlet of the axis oxidant in real time according to the required atomization amount;
s7, carrying out secondary atomization collision on the oxidant jetted from the oxidant jet hole and the atomized liquid drops generated in the S6;
s8, after secondary atomization collision in the mixing area, using the Sott average diameter SMD as an index for measuring atomization quality, wherein the expression is as follows:
in the formula: mu.s f Viscosity, σ, being the movement of a non-Newtonian fluid f Is the surface tension of a non-Newtonian fluid, G f Is the flow rate, Δ P, of the non-Newtonian fluid f Is the pressure drop of the non-newtonian fluid.
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