CN115163360A - Heavy oil air flue jet flow mixing device - Google Patents
Heavy oil air flue jet flow mixing device Download PDFInfo
- Publication number
- CN115163360A CN115163360A CN202210608145.4A CN202210608145A CN115163360A CN 115163360 A CN115163360 A CN 115163360A CN 202210608145 A CN202210608145 A CN 202210608145A CN 115163360 A CN115163360 A CN 115163360A
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- Prior art keywords
- cylinder
- air inlet
- oil
- piston
- air
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- 238000002156 mixing Methods 0.000 title claims abstract description 31
- 239000000295 fuel oil Substances 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 16
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000005507 spraying Methods 0.000 abstract description 7
- 239000007921 spray Substances 0.000 abstract description 6
- 230000001174 ascending effect Effects 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000003502 gasoline Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10262—Flow guides, obstructions, deflectors or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The invention provides a heavy oil air flue jet flow mixing device which comprises an air inlet pipe straight pipe section, an air inlet, an air cylinder necking structure, a cylinder sleeve, a piston and an oil injector, wherein a nozzle of the oil injector is arranged at the top of the air inlet pipe straight pipe section, the air inlet is arranged in a cylinder cover, the bottom of the air inlet pipe straight pipe section is connected to the air inlet through a flange bolt, the air inlet is in contact with one end of the air cylinder necking structure, the other end of the air cylinder necking structure is connected with the cylinder sleeve through a bolt, and the cylinder sleeve is sealed with the piston through a piston ring. According to the invention, through the cooperative design of the air inlet process, the oil injection process and the combustion chamber, the transportation of the richer mixed gas in the cylinder can be completed in a mode of large-scale flow in the cylinder, and the final mixing is completed through small-scale flow after the large-scale flow is broken in the piston ascending process. Meanwhile, in the spray mixing process, the energy in the oil spraying process can be greatly used for promoting the flow and mixing in the cylinder so as to increase the turbulent kinetic energy in the cylinder.
Description
Technical Field
The invention belongs to the field of engines, and particularly relates to a heavy oil air passage jet flow mixing device.
Background
The cetane number of heavy oil (aviation kerosene) is close to that of diesel oil, the octane number is less than half of that of commercial gasoline, the viscosity is high, the volatility is far weaker than that of gasoline, and the aviation kerosene is a safe and reliable military and civil aviation fuel. The ignition engine has extremely high technical maturity, and is very suitable for application scenes of small and medium-sized aircrafts with large intake condition change intervals because the air-fuel ratio is controllable and the ignition is independent of the in-cylinder thermodynamic atmosphere. The ignition type gasoline engine can use heavy oil as fuel through simple modification, but due to the reasons of large viscosity, poor volatility and the like of the heavy oil, the uniformity of formed mixed gas is poor, the ignition stability of the engine is poor, flame propagation is not facilitated, the heat-power conversion capability of the engine is influenced, and potential safety hazards such as fire catching are brought. The invention provides a heavy oil air flue jet flow mixing technology which can finally reach the homogenization degree close to gasoline air flue jet (PFI) mixed gas.
Disclosure of Invention
In view of this, the present invention aims to provide a heavy oil air passage jet flow mixing device, a technology for obtaining a near homogeneous mixed gas by flow mixing; the technology can improve the turbulent kinetic energy in the cylinder, effectively reduce the combustion cycle change of the ignition engine, improve the flame propagation speed, increase the combustion isochoricity and improve the heat-power conversion efficiency. Oil drop adhesion on the wall surface of the air passage is reduced through the cooperative design of the air passage and the oil sprayer, the transportation of the richer mixed gas in the cylinder can be completed in a large-scale flowing mode through the air inlet process, the oil spraying process and the combustion chamber, and the final mixing is completed through small-scale flowing after the large-scale flowing is broken in the piston ascending process. Meanwhile, the energy in the oil spraying process can be used for promoting the flow and mixing in the cylinder to a greater degree in the spraying and mixing process so as to increase the turbulent kinetic energy in the cylinder.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the realization of the heavy oil air flue jet flow mixing technology requires the mutual cooperation of a plurality of systems and components, wherein the systems mainly comprise an oil supply system, a ventilation system and a combustion system; the component mainly includes: the device comprises an oil injector, an air inlet channel, a cylinder cover, a cylinder sleeve, a piston and the like;
because heavy oil has high viscosity and poor volatility compared with gasoline, in order to fully utilize the crushing and space mixing after spraying and simultaneously reduce the oil drop attachment of the pipe wall of the air inlet passage, a scheme that a smaller oil beam wrap angle oil sprayer is coupled with a straight air passage with a specific length is adopted;
the oil-gas mixture after the preliminary space mixing of the air passage after the spray crushing is fluid with a certain speed, wherein the speed of an oil beam sprayed by an oil sprayer is higher than the speed of air in the air passage, and the speed of a thick mixture (with more oil and less air) is higher than the speed of a thin mixture. The mixed gas entering the cylinder moves towards the piston direction, the moving direction is changed after the fluid contacts the wall surface of the top of the piston, meanwhile, oil drops with larger particle sizes in the dense mixed gas area are crushed again after colliding with the top surface of the piston, and under the action of the top surface of the piston, the inner wall of the cylinder sleeve and the bottom surface of the cylinder cover, the oil drops flowing in the cylinder rotate in the cylinder in a vertical vortex group form, namely, the Tumble (Tumble) in the gasoline engine makes the oil drops be uniformly distributed in the cylinder possibly. Due to the flow guiding effect of the wall surface of the piston, energy carried in the spray of the oil sprayer can be transferred to the in-cylinder tumble flow, so that the in-cylinder tumble flow strength and turbulent kinetic energy are promoted, and the uniformity of the mixed gas is promoted. Different from the large-scale turbulence in the cylinder organized by the air passage structure of the existing gasoline engine and diesel engine, the invention organizes the large-scale turbulence in the cylinder by the wall surface diversion after the wall is hit by spraying;
the utility model provides a heavy oil air flue sprays mobile mixing arrangement, includes intake pipe straight tube section, air inlet, cylinder throat structure, cylinder liner, piston and sprayer, the nozzle setting of sprayer is at the top of intake pipe straight tube section, the air inlet sets up inside the cylinder cap, and flange bolted connection is passed through to the bottom of intake pipe straight tube section to the air inlet, air inlet and the contact of cylinder throat structure one end, the cylinder throat structure other end passes through bolted connection with the cylinder liner, the cylinder liner passes through the piston ring and realizes sealing with the piston.
Furthermore, the inner diameter of the cylinder necking structure is taken as r1, the diameter of the cylinder is taken as d, the numerical range of the r1 is 0.15d-0.25d, and the distance between the center line of the cylinder necking structure and the center line of the cylinder sleeve is 0-0.35d.
Furthermore, the height of an oil nozzle of the oil nozzle from the bottom plane of the air inlet is h, and the angle of the oil beam wrap angle is smaller than 2arctan (r 1/h).
Compared with the prior art, the heavy oil air flue jet flow mixing device has the following advantages:
(1) According to the heavy oil air passage jet flow mixing device, oil drop adhesion on the wall surface of the air passage in the heavy oil air passage jet process can be reduced through the cooperative design of the air passage and the wrap angle of the oil injector, the difference value between the oil injection quantity and the oil quantity actually entering a cylinder caused by uncontrollable oil drop adhesion on the wall surface of the air passage is reduced, the oil quantity control precision of an engine is improved, and the combustion cycle fluctuation is reduced.
(2) According to the heavy oil air flue jet flow mixing device, through the synergistic design of the air inlet process, the oil injection process and the combustion chamber, the transportation of a relatively dense mixed gas in a cylinder can be completed in a large-scale flow mode in the cylinder, the final mixing is completed through a small-scale flow after the large-scale flow is broken in the piston ascending process, and finally the homogeneity degree of the mixed gas close to the gasoline air flue jet (PFI) can be achieved.
(3) The invention relates to a heavy oil air flue jet flow mixing device, which finally transfers the energy carried in the oil injection process into large-scale flow in a cylinder in a piston wall surface flow guiding mode to increase the turbulent kinetic energy in the cylinder, wherein the fluid flow speed is in direct proportion to the square root of the fluid pressure difference as known by the Bernoulli equation of incompressible fluid, the mass ratio of air to fuel is about 14 to 15 in an engine with chemical equivalence ratio combustion, the average pressure difference in the air intake process of a natural air suction engine is far less than one atmosphere, the oil injection pressure and the pressure difference in an air flue can reach dozens or even hundreds of atmospheres, the purpose of remarkably improving the turbulent kinetic energy in the cylinder can be achieved by fully utilizing the energy in oil injection, the flame propagation speed can be remarkably improved, and the detonation combustion can be reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a heavy oil gas passage jet flow mixing device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a heavy oil gas passage jet flow mixing device for spraying and colliding with a wall according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a tumble structure of a heavy oil gas passage jet flow mixing device according to an embodiment of the present invention.
Description of the reference numerals:
1. a straight pipe section of an air inlet pipe; 2. an air inlet; 3. a cylinder necking structure; 4. a cylinder liner; 5. a piston.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A heavy oil air flue jet flow mixing device is shown in figures 1-3 and comprises an air inlet pipe straight pipe section 1, an air inlet 2, an air cylinder necking structure 3, a cylinder sleeve 4, a piston 5 and an oil injector, wherein a nozzle of the oil injector is arranged at the top of the air inlet pipe straight pipe section 1, the air inlet 2 is arranged inside the cylinder cover, the bottom of the air inlet pipe straight pipe section 1 is connected to the air inlet 2 through a flange bolt, the air inlet 2 is in contact with one end of the air cylinder necking structure 3, the other end of the air cylinder necking structure 3 is connected with the cylinder sleeve 4 through a bolt, the cylinder sleeve 4 is sealed with the piston 5 through a piston 5 ring, and the oil injector is not shown in the figures.
Furthermore, the inner diameter of the cylinder throat structure 3 is taken as r1, the diameter of the cylinder is taken as d, the numerical range of r1 is 0.15d-0.25d, the center line of the cylinder throat structure 3 does not coincide with the center line of the cylinder sleeve 4, the distance between the center line of the cylinder throat structure 3 and the center line of the cylinder sleeve 4 is 0-0.35d, and the distance ensures that the cylinder throat is offset relative to the cylinder sleeve 4, so that the direction of the incoming flow in the air passage, the air port and the cylinder throat is positioned on one side of the center line of the piston 5.
Further, the height of an oil nozzle of the oil nozzle from the bottom plane of the air inlet 2 is h, and the angle of the oil beam wrap angle is smaller than 2arctan (r 1/h); finally, the effect shown in figure 2 is achieved, the outer side of the spray is just close to the wall surface but is not contacted with the pipe wall all the time in the variation range of the oil injection pressure and the oil amount, and therefore the purpose of fully utilizing the inner space of the air passage to achieve mixing is achieved. The collision wall position of the sprayed oil beam and the piston 5 is positioned on one side of the central line of the top surface of the spherical crown type piston 5, the flowing direction of most of the oil beam after colliding the wall approximately moves along the top surface of the piston 5, and finally, under the influence of the cylinder sleeve 4 and the cylinder necking structure 3, tumble flow as shown in figure 3 is formed. At the moment of wall collision, the larger-diameter liquid drops in the spray oil beam can be crushed again after contacting the wall surface of the piston 5, and meanwhile, the tumble flow can integrate the higher-speed and lower-speed dense mixed gas into one flow to realize the transportation of oil drops in the cylinder. Along with the upward movement of the piston 5, the distance between the top surface of the piston 5 and the cylinder necking structure 3 is reduced, the space is changed into a geometric shape which is wide at the left and right and narrow at the upper and lower parts, the tumble flow which moves in a nearly circular vortex-like shape is forced to be crushed, and finally, the tumble flows in a small size to continuously complete mixing;
according to the heavy oil air passage jet flow mixing technology, the intensity of in-cylinder tumble flow and the intensity of in-cylinder turbulent kinetic energy can be adjusted by changing the oil injection pressure, so that the homogeneity degree of mixed gas is influenced, and when the rotating speed, the load and the circulating oil quantity of an engine are changed, the oil injection pressure has the most economic pressure meeting the power performance requirement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (3)
1. A heavy oil air flue jet flow mixing device is characterized in that: including intake pipe straight tube section, air inlet, cylinder throat structure, cylinder liner, piston and sprayer, the nozzle setting of sprayer is at the top of intake pipe straight tube section, the air inlet sets up inside the cylinder cap, and flange bolted connection is passed through to the bottom of intake pipe straight tube section to the air inlet, air inlet and the contact of cylinder throat structure one end, the cylinder throat structure other end passes through bolted connection with the cylinder liner, the cylinder liner passes through the piston ring and realizes sealing with the piston.
2. A heavy oil airway jet flow mixing device according to claim 1 wherein: the inner diameter of the cylinder necking structure is taken as r1, the diameter of the cylinder is taken as d, the numerical range of the r1 is 0.15d-0.25d, and the distance between the center line of the cylinder necking structure and the center line of the cylinder sleeve is 0-0.35d.
3. The apparatus of claim 1, wherein: the height from the oil nozzle of the oil nozzle to the bottom plane of the air inlet is h, and the angle of the oil beam wrap angle is smaller than 2arctan (r 1/h).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210608145.4A CN115163360A (en) | 2022-05-31 | 2022-05-31 | Heavy oil air flue jet flow mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210608145.4A CN115163360A (en) | 2022-05-31 | 2022-05-31 | Heavy oil air flue jet flow mixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115163360A true CN115163360A (en) | 2022-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210608145.4A Pending CN115163360A (en) | 2022-05-31 | 2022-05-31 | Heavy oil air flue jet flow mixing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN115163360A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012188937A (en) * | 2011-03-08 | 2012-10-04 | Mitsubishi Motors Corp | Internal combustion engine |
| JP2016017434A (en) * | 2014-07-07 | 2016-02-01 | ダイハツ工業株式会社 | Internal combustion engine cylinder head |
| CN107842435A (en) * | 2017-10-20 | 2018-03-27 | 奇瑞汽车股份有限公司 | The high tumble inlet port of direct spray petrol engine in cylinder |
| CN209195569U (en) * | 2018-12-29 | 2019-08-02 | 重庆长安汽车股份有限公司 | A kind of arragement construction, engine and the automobile of air intake duct and fuel injector |
-
2022
- 2022-05-31 CN CN202210608145.4A patent/CN115163360A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012188937A (en) * | 2011-03-08 | 2012-10-04 | Mitsubishi Motors Corp | Internal combustion engine |
| JP2016017434A (en) * | 2014-07-07 | 2016-02-01 | ダイハツ工業株式会社 | Internal combustion engine cylinder head |
| CN107842435A (en) * | 2017-10-20 | 2018-03-27 | 奇瑞汽车股份有限公司 | The high tumble inlet port of direct spray petrol engine in cylinder |
| CN209195569U (en) * | 2018-12-29 | 2019-08-02 | 重庆长安汽车股份有限公司 | A kind of arragement construction, engine and the automobile of air intake duct and fuel injector |
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Application publication date: 20221011 |