CN109630328B - Composite air inlet channel for diesel engine by using gasoline instead of engine - Google Patents
Composite air inlet channel for diesel engine by using gasoline instead of engine Download PDFInfo
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- CN109630328B CN109630328B CN201910055553.XA CN201910055553A CN109630328B CN 109630328 B CN109630328 B CN 109630328B CN 201910055553 A CN201910055553 A CN 201910055553A CN 109630328 B CN109630328 B CN 109630328B
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- 239000002131 composite material Substances 0.000 title claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- 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
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
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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
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
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- 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
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10078—Connections of intake systems to the engine
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Cyclones (AREA)
Abstract
The invention discloses a composite air inlet channel of an engine which is changed into gasoline fuel on the basis of a diesel engine, which is characterized in that on the basis of keeping the flat-bottom cylinder cover of the original diesel engine, the longitudinal rolling flow intensity in a cylinder is increased by adopting a spiral and tangential composite air inlet channel, and inclined shaft vortex is formed in the cylinder. The invention can improve the turbulence intensity in the cylinder, promote the radial propagation of flame and improve the propagation speed of flame, thereby ensuring that the engine has better dynamic property and economy after being changed into gasoline fuel, and further being matched with a three-way catalyst, and meeting the requirements of the engine performance and emission of medium and heavy commercial vehicles under the condition that a post-treatment system is greatly simplified.
Description
Technical Field
The invention relates to structural design optimization of an engine air inlet, in particular to a composite air inlet for an engine which is ignited by gasoline instead of a diesel engine.
Background
Along with the continuous upgrading of emission regulations, the diesel engine has higher and higher dependence on aftertreatment, and the complexity and the use cost of the integration of the aftertreatment device are obviously increased. The gasoline fuel equivalent premixed combustion is changed on the basis of the original diesel engine, and the ultra-low emission requirement can be met only through the three-way catalytic converter, so that the aftertreatment system is greatly simplified, and the integral use and calibration cost of the engine are reduced; on the other hand, the diesel engine body has higher strength, and can bear higher burst pressure compared with the traditional gasoline engine, so that after the gasoline fuel is changed, the high-pressure ratio, the high-compression ratio, the waste gas dilution and other advanced combustion technologies are combined, the higher engine heat efficiency and the higher power can still be realized, and the requirements of commercial vehicles are met. However, the existing diesel engine platform mostly adopts a flat-bottom cylinder cover, a spiral air inlet channel and an omega-shaped combustion chamber, and the main effect of the existing diesel engine platform is to increase the mixing degree and the mixing rate of diesel oil and air mainly due to the fact that the ordered vortex flow field can limit the radial propagation of flame when the existing diesel engine platform is ignited and combusted by gasoline, so that the flame propagation speed is reduced, and the knocking tendency is increased. Therefore, there is a need for further improvements in the structure of the intake duct of the gasoline ignition engine.
Disclosure of Invention
The invention aims to provide a composite air inlet channel suitable for a diesel engine which is changed from gasoline to an engine, and the invention breaks through ordered vortex fields in a cylinder through the optimization design of an air channel structure, increases the longitudinal tumble intensity, improves the turbulence intensity in the cylinder, simultaneously promotes the radial propagation of flame and improves the flame propagation speed.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a composite air inlet of an engine which is changed into gasoline fuel on the basis of a diesel engine consists of a spiral air inlet and a tangential air inlet;
The spiral air inlet channel consists of a direct current section, a spiral section which spirals downwards and a spiral air inlet channel outlet which are connected in sequence, the spiral section is positioned above a cylinder cover of the cylinder, the inlet end of the direct current section is a spiral air inlet channel inlet, the spiral air inlet channel outlet is arranged on the cylinder cover and is communicated with the inside of the cylinder, the bottom surface of the cylinder cover is a plane which is arranged along the horizontal direction, and a spark plug is arranged at the center of the cylinder cover; the top of the spiral section is provided with a first round hole for fixing and guiding the valve rod of the air valve, and the central axis of the first round hole is coincident with the central axis of the outlet of the spiral air inlet channel;
The inlet end of the tangential air inlet is a tangential air inlet, the outlet end of the tangential air inlet is a tangential air inlet outlet, and the tangential air inlet outlet is arranged on the cylinder cover and is communicated with the inside of the cylinder; the top of the tangential air inlet channel is provided with a second round hole for fixing and guiding the valve rod of the air valve, and the central axis of the second round hole is coincident with the central axis of the outlet of the tangential air inlet channel;
The shape of the spiral air inlet channel inlet is consistent with that of the tangential air inlet channel inlet, the vertical planes of the spiral air inlet channel inlet and the tangential air inlet channel inlet are perpendicular to the horizontal plane of the bottom surface of the cylinder cover, and the spiral air inlet channel outlet and the tangential air inlet channel outlet are symmetrically distributed left and right by taking a central axis of the cylinder cover as a symmetrical axis;
The height H between the central axis of the inlet of the spiral air inlet and the plane of the outlet of the spiral air inlet is the same as the height H between the central axis of the inlet of the tangential air inlet and the plane of the outlet of the tangential air inlet;
The lower side profile of a profile line formed by intersecting the vertical central plane of the direct current section of the spiral air inlet channel comprises a first inlet straight line section and a first arc section which are sequentially connected, wherein an included angle alpha 1 between the first inlet straight line section and a vertical plane where an inlet of the spiral air inlet channel is positioned is 85-90 degrees; the ratio of the radius R1 of the first circular arc section to the radius R1 of the outlet of the spiral air inlet channel is 2.3-2.7, the included angle beta 1 between the tangent line of the first circular arc section at the outlet position of the spiral air inlet channel and the normal direction of the plane of the outlet of the spiral air inlet channel is 20-30 degrees, the connecting circular arc radius R2 between the first inlet straight line section and the first circular arc section is 4-6mm, and the connecting circular arc radius R3 between the first circular arc section and the outlet of the spiral air inlet channel is 4-6mm;
The upper side profile of a profile line formed by intersecting the direct current section of the spiral air inlet and the vertical central plane of the direct current section of the spiral air inlet comprises a second inlet straight line section and a second circular arc section which are sequentially connected, and an included angle alpha 2 between the second inlet straight line section and the vertical plane where the inlet of the spiral air inlet is positioned is 85-90 degrees; the ratio of the radius R4 of the second circular arc section to the radius R1 of the outlet of the spiral air inlet channel is 10-12; the intersection of the second inlet straight line segment and the second circular arc segment is tangentially arranged;
The ratio of the outer radius R5 of the spiral casing of the spiral section of the spiral air inlet and the radius R1 at the outlet of the spiral air inlet is 1.1-1.2, the ratio of the inner radius R6 of the spiral casing of the spiral section of the spiral air inlet and the radius R1 at the outlet of the spiral air inlet is 0.5-0.7, and the ratio of the height G of the spiral chamber of the spiral section of the spiral air inlet and the height H between the horizontal central axis of the inlet of the spiral air inlet and the plane of the outlet of the spiral air inlet is 0.6-0.8;
The lower side profile of the profile line formed by intersecting the tangential air inlet and the vertical central plane of the tangential air inlet comprises a third inlet straight line segment and an outlet straight line segment, the outlet straight line segment is connected with the third inlet straight line segment through a connecting circular arc, and an included angle alpha 3 between the third inlet straight line segment and the vertical plane where the tangential air inlet is positioned is 85-90 degrees; the included angle gamma between the straight line section of the outlet and the horizontal plane of the outlet of the tangential air inlet is 40-48 degrees, the ratio of the arc radius R7 of the connecting arc to the radius R2 of the outlet of the tangential air inlet is 1.8-2.5, and the connecting arc radius R8 between the straight line section of the outlet and the outlet of the tangential air inlet is 4-6mm;
The upper side profile of a profile line formed by intersecting the tangential air inlet and the vertical central plane of the tangential air inlet comprises a fourth inlet straight line segment and a third arc segment which are sequentially connected, and an included angle alpha 4 between the fourth inlet straight line segment and the vertical plane where the tangential air inlet is positioned is 85-90 degrees; the ratio of the radius R9 of the third arc section to the radius R2 at the outlet of the tangential air inlet is 5-6, the included angle beta 2 between the tangent line of the third arc section at the outlet position of the tangential air inlet and the normal of the horizontal plane where the outlet of the tangential air inlet is positioned is 5-15 degrees, the ratio of the connecting arc radius R10 between the third arc section and the fourth inlet straight line section to the radius R2 at the outlet of the tangential air inlet is 6-7, and the connecting arc radius R11 between the third arc section and the outlet of the tangential air inlet is 4-6mm.
Compared with the prior art, the invention has the beneficial effects that:
the longitudinal rolling flow intensity in the cylinder is increased through the design of the spiral and tangential composite air inlet channel, and inclined shaft vortex is formed in the cylinder, so that on one hand, the turbulence intensity of the spark plug position at the ignition moment is increased, and the formation of a flame kernel and the early propagation of flame are promoted; on the other hand, the ordered vortex field in the original spiral air inlet channel combustion system is disturbed, so that the flame propagation speed in the combustion process is obviously improved, the knocking tendency is reduced, the maximum explosion pressure in a cylinder is improved, relatively high thermal efficiency and power per liter can be realized after the engine is changed to gasoline fuel, the engine is ensured to have better dynamic property and economical efficiency after the engine is changed to gasoline fuel, and the requirements of the engine performance and emission of the medium and heavy commercial vehicle are met under the condition that the aftertreatment system is greatly simplified by matching with a three-way catalyst.
Drawings
FIG. 1 is a schematic top view of a compound air passage of a diesel engine of the present invention modified to use gasoline to ignite the engine;
FIG. 2 is a cross-sectional view of a screw intake at section A-A;
FIG. 3 is a cross-sectional view of the tangential inlet at section B-B;
fig. 4 is a schematic perspective view of a composite air passage of the diesel engine of the present invention, which is modified from gasoline ignition engine.
Detailed Description
In order to further illustrate the functional structure of the present invention, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
As shown in fig. 1, a composite air inlet of the invention, which is changed into a gasoline ignition engine based on a diesel engine, consists of a spiral air inlet 1 and a tangential air inlet 2.
The spiral air inlet channel 1 is composed of a direct current section 4, a spiral section 5 which spirals downwards and a spiral air inlet channel outlet 6-1 which are connected in sequence, and the spiral section 5 is positioned above a cylinder cover 8 of a cylinder. The inlet end of the direct current section 4 is a spiral air inlet channel inlet 3-1. The spiral air inlet channel outlet 6-1 is arranged on the cylinder cover 8 and is communicated with the inside of the cylinder. The bottom surface of the cylinder cover 8 is a plane arranged along the horizontal direction, and a spark plug 9 is arranged at the center of the cylinder cover 8. The top of the spiral section 5 is provided with a first round hole 7-1 for fixing and guiding the valve rod of the air valve, and the central axis of the first round hole 7-1 coincides with the central axis of the outlet 6-1 of the spiral air inlet channel.
The inlet end of the tangential air inlet 2 is a tangential air inlet 3-2, and the outlet end of the tangential air inlet 2 is a tangential air inlet outlet 6-2. The tangential inlet outlet 6-2 is arranged on the cylinder cover 8 and is communicated with the inside of the cylinder. The top of the tangential air inlet channel 2 is provided with a second round hole 7-2 for fixing and guiding the valve rod of the air valve, and the central axis of the second round hole 7-2 is coincident with the central axis of the tangential air inlet channel outlet 6-2.
The shape of the spiral air inlet 3-1 is consistent with that of the tangential air inlet 3-2, and the vertical planes of the spiral air inlet 3-1 and the tangential air inlet 3-2 are perpendicular to the horizontal plane of the bottom surface of the cylinder cover 8. The spiral air inlet channel outlet 6-1 and the tangential air inlet channel outlet 6-2 are symmetrically distributed left and right by taking a central axis of the cylinder cover 8 as a symmetrical axis.
As shown in fig. 2 and 3, the height H between the central axis of the inlet 3-1 of the helical intake and the plane of the outlet 6-1 of the helical intake is the same as the height H between the central axis of the inlet 3-2 of the tangential intake and the plane of the outlet 6-2 of the tangential intake.
As shown in fig. 2, a lower side contour line 10 of a contour line formed by intersecting a vertical center plane A-A of a direct current section 4 of the helical intake duct 1 and the helical intake duct comprises a first inlet straight line section 10-1 and a first circular arc section 10-2 which are sequentially connected, wherein an included angle α1 between the first inlet straight line section 10-1 and a vertical plane where the helical intake duct inlet 3-1 is located is 85-90 °; the ratio of the radius R1 of the first circular arc section 10-2 to the radius R1 of the spiral inlet channel outlet 6-1 is 2.3-2.7, the included angle beta 1 between the tangent line of the first circular arc section 10-2 at the position of the spiral inlet channel outlet 6-1 and the normal direction of the plane where the spiral inlet channel outlet 6-1 is positioned is 20-30 degrees, the connecting circular arc radius R2 between the first inlet straight line section 10-1 and the first circular arc section 10-2 is 4-6mm, and the connecting circular arc radius R3 between the first circular arc section 10-2 and the spiral inlet channel outlet 6-1 is 4-6mm.
As shown in fig. 2, an upper profile 11 of a profile line formed by intersecting a direct current section 4 of the helical intake duct 1 with a vertical central plane A-A of the helical intake duct direct current section 4 includes a second inlet straight line section 11-1 and a second arc section 11-2 which are sequentially connected, wherein an included angle α2 between the second inlet straight line section 11-1 and a vertical plane in which the helical intake duct inlet 3-1 is located is 85-90 °; the ratio of the radius R4 of the second circular arc section 11-2 to the radius R1 of the helical inlet channel outlet 6-1 is 10-12; the intersection of the second inlet straight line segment 11-1 and the second circular arc segment 11-2 is tangentially arranged.
As shown in fig. 1, the ratio of the outer radius R5 of the spiral casing of the screw inlet screw section 5 to the radius R1 at the screw inlet outlet 6-1 is 1.1-1.2, and the ratio of the inner radius R6 of the spiral casing of the screw inlet screw section 5 to the radius R1 of the screw inlet outlet 6-1 is 0.5-0.7. As shown in fig. 2, the ratio of the height G of the spiral chamber of the spiral section 5 of the spiral inlet to the height H of the horizontal central axis of the inlet 3-1 of the spiral inlet from the plane of the outlet 6-1 of the spiral inlet is 0.6-0.8, as shown in fig. 2.
As shown in fig. 3, the lower side contour line 12 of the contour line formed by intersecting the tangential air inlet 2 with the tangential air inlet vertical center plane B-B includes a third inlet straight line segment 12-1 and an outlet straight line segment 12-2, the outlet straight line segment 12-2 is connected with the third inlet straight line segment 12-1 through a connecting arc, and an included angle α3 between the third inlet straight line segment 12-1 and a vertical plane where the tangential air inlet 3-2 is located is 85-90 °; the included angle gamma between the outlet straight line section 12-2 and the horizontal plane where the tangential air inlet outlet 6-2 is positioned is 40-48 degrees, the ratio of the arc radius R7 of the connecting arc to the radius R2 of the tangential air inlet outlet 6-2 is 1.8-2.5, and the connecting arc radius R8 between the outlet straight line section 12-2 and the tangential air inlet outlet 6-2 is 4-6mm.
As shown in fig. 3, an upper profile 13 of a profile line formed by intersecting the tangential air inlet 2 with the tangential air inlet vertical center plane B-B includes a fourth inlet straight line segment 13-1 and a third circular arc segment 13-2 which are sequentially connected, and an included angle α4 between the fourth inlet straight line segment 13-1 and a vertical plane where the tangential air inlet 3-2 is located is 85-90 °; the ratio of the radius R9 of the third circular arc section 13-2 to the radius R2 at the tangential air inlet outlet 6-2 is 5-6, the included angle beta 2 between the tangent line of the third circular arc section 13-2 at the tangential air inlet outlet 6-2 and the normal of the horizontal plane where the tangential air inlet outlet 6-2 is positioned is 5-15 degrees, the ratio of the connecting circular arc radius R10 between the third circular arc section 13-2 and the fourth inlet straight line section 13-1 to the radius R2 at the tangential air inlet outlet 6-2 is 6-7, and the connecting circular arc radius R11 between the third circular arc section 13-2 and the tangential air inlet outlet 6-2 is 4-6mm.
Example 1
In the embodiment, the diameter D of an engine cylinder is 90mm, the compression ratio is 12, and the cylinder cover is of a four-valve structure. As shown in fig. 1, the composite intake passage of the engine is composed of a helical intake passage 1 and a tangential intake passage 2. The spiral air inlet channel 1 is composed of a direct current section 4, a spiral section 5 which spirals downwards and a spiral air inlet channel outlet 6-1 which are connected in sequence, and the spiral section 5 is positioned above a cylinder cover 8 of a cylinder. The inlet end of the direct current section 4 is a helical air inlet channel inlet 3-1. The outlet of the spiral air inlet channel outlet 6-1 is arranged on the cylinder cover 8 and communicated with the inside of the cylinder. The bottom surface of the cylinder cover 8 is a plane arranged along the horizontal direction, and a spark plug 9 is arranged at the center of the cylinder cover 8. The top of the spiral section 5 is provided with a first round hole 7-1 for fixing and guiding the valve rod of the air valve, and the central axis of the first round hole 7-1 coincides with the central axis of the outlet 6-1 of the spiral air inlet channel. The inlet end of the tangential air inlet 2 is a tangential air inlet 3-2, and the outlet end of the tangential air inlet 2 is a tangential air inlet outlet 6-2. Tangential inlet port outlet 6-2 is provided in head 8 and communicates with the cylinder interior. The top of the tangential air inlet 2 is provided with a second round hole 7-2 for fixing and guiding the valve rod of the air valve, the central axis of the second round hole 7-2 and the central axis of the tangential air inlet outlet 6-2 coincide with the shape of the spiral air inlet 3-1 and the shape of the tangential air inlet 3-2, and the vertical planes of the spiral air inlet 3-1 and the tangential air inlet 3-2 are perpendicular to the horizontal plane of the bottom surface of the cylinder cover 8. The spiral inlet channel outlet 6-1 and the tangential inlet channel outlet 6-2 are symmetrically distributed left and right by taking a central axis of the cylinder cover 8 as a symmetrical axis. As shown in fig. 2 and 3, the height H between the central axis of the inlet 3-1 of the helical intake and the plane of the outlet 6-1 of the helical intake is the same as the height H between the central axis of the inlet 3-2 of the tangential intake and the plane of the outlet 6-2 of the tangential intake and is 51mm.
In this embodiment, the radius r1 of the helical intake duct outlet 6-1 is 20mm, and the radius r2 of the tangential intake duct outlet 6-2 is 20mm. As shown in fig. 2, a lower side contour line 10 of a contour line formed by intersecting a vertical center surface A-A of a direct current section 4 of a helical intake duct 1 comprises a first inlet straight line section 10-1 and a first circular arc section 10-2 which are sequentially connected, wherein an included angle alpha 1 between the first inlet straight line section 10-1 and a vertical plane where an inlet 3-1 of the helical intake duct is located is 85 degrees; the radius R1 of the first circular arc section 10-2 is 53mm, the included angle beta 1 between the tangent line of the first circular arc section 10-2 at the position of the spiral inlet channel outlet 6-1 and the normal direction of the plane of the spiral inlet channel outlet 6-1 is 23 degrees, the connecting circular arc radius R2 between the first inlet straight line section 10-1 and the first circular arc section 10-2 is 5mm, and the connecting circular arc radius R3 between the first circular arc section 10-2 and the spiral inlet channel outlet 6-1 is 5mm. The upper side profile 11 of a profile line formed by intersecting the direct current section 4 of the spiral inlet channel 1 and the vertical central surface A-A of the direct current section 4 of the spiral inlet channel comprises a second inlet straight line section 11-1 and a second circular arc section 11-2 which are sequentially connected, wherein an included angle alpha 2 between the second inlet straight line section 11-1 and a plane where the inlet 3-1 of the spiral inlet channel is positioned is 89 degrees; the radius R4 of the second arc section is 230mm; the intersection of the second inlet straight line segment 11-1 and the second circular arc segment 11-2 is tangentially arranged. As shown in fig. 1, the spiral casing outer radius R5 of the spiral inlet spiral section 5 is 24mm, and the spiral casing inner radius R6 of the spiral inlet spiral section 5 is 13mm; the helical chamber height G of the helical inlet helical section 5 is 35.7mm, as shown in fig. 2. As shown in fig. 3, a lower side contour line 12 of a contour line formed by intersecting the tangential air inlet 2 and the tangential air inlet vertical center plane B-B includes a third inlet straight line segment 12-1 and an outlet straight line segment 12-2, the outlet straight line segment 12-2 is connected with the third inlet straight line segment 12-1 through a connecting arc, and an included angle α3 between the third inlet straight line segment 12-1 and a plane where the tangential air inlet 3-2 is located is 86 °; the included angle gamma between the outlet straight line section 12-2 and the horizontal plane where the tangential inlet outlet 6-2 is positioned is 44 degrees, the arc radius R7 of the connecting arc is 42mm, and the connecting arc radius R8 between the outlet straight line section 12-2 and the tangential inlet outlet 6-2 is 5mm. The upper side profile 13 of the profile line formed by intersecting the tangential air inlet 2 and the tangential air inlet vertical center plane B-B comprises a fourth inlet straight line segment 13-1 and a third circular arc segment 13-2 which are sequentially connected, and an included angle alpha 4 between the fourth inlet straight line segment 13-1 and a vertical plane where the tangential air inlet 3-2 is positioned is 90 degrees; the radius R9 of the third circular arc section 13-2 is 104mm, the included angle beta 2 between the tangent line of the third circular arc section 13-2 at the position of the tangential air inlet outlet 6-2 and the normal direction of the horizontal plane where the tangential air inlet outlet 6-2 is positioned is 11 degrees, the connecting circular arc radius R10 between the third circular arc section 13-2 and the fourth inlet straight line section 13-1 is 132mm, and the connecting circular arc radius R11 between the third circular arc section 13-2 and the tangential air inlet outlet 6-2 is 5mm.
Test effect:
On the basis of keeping the original flat-bottom cylinder cover of the diesel engine, the invention increases the longitudinal rolling flow intensity in the cylinder by adopting the spiral and tangential composite air inlet channel, forms inclined axis vortex in the cylinder, increases the turbulence intensity of the spark plug position at the moment of ignition, promotes the formation of a flame kernel and the early propagation of flame, and disturbs the ordered vortex field in the combustion system of the original spiral air inlet channel, obviously improves the flame propagation rate in the combustion process and reduces the knocking tendency.
Although the invention has been described above with reference to the drawings, the invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by those of ordinary skill in the art without departing from the spirit of the invention, which fall within the protection of the invention.
Claims (1)
1. A composite air inlet of an engine which is changed into gasoline fuel on the basis of a diesel engine consists of a spiral air inlet (1) and a tangential air inlet (2);
The spiral air inlet channel (1) consists of a direct current section (4), a spiral section (5) and a spiral air inlet channel outlet (6-1) which are connected in sequence, wherein the spiral section (5) is positioned above a cylinder cover (8) of the cylinder, the inlet end of the direct current section (4) is a spiral air inlet channel inlet (3-1), the spiral air inlet channel outlet (6-1) is arranged on the cylinder cover and is communicated with the inside of the cylinder, the bottom surface of the cylinder cover (8) is a plane arranged along the horizontal direction, and a spark plug (9) is arranged at the center position of the cylinder cover (8); the top of the spiral section (5) is provided with a first round hole (7-1) for fixing and guiding the valve rod of the air valve, and the central axis of the first round hole (7-1) is coincident with the central axis of the outlet (6-1) of the spiral air inlet channel;
The inlet end of the tangential air inlet channel (2) is a tangential air inlet channel inlet (3-2), the outlet end of the tangential air inlet channel is a tangential air inlet channel outlet (6-2), and the tangential air inlet channel outlet (6-2) is arranged on a cylinder cover (8) and is communicated with the inside of the cylinder; the top of the tangential air inlet channel (2) is provided with a second round hole (7-2) for fixing and guiding the valve rod of the air valve, and the central axis of the second round hole (7-2) is coincident with the central axis of the tangential air inlet channel outlet (6-2);
The shape of the spiral air inlet channel inlet (3-1) is consistent with that of the tangential air inlet channel inlet (3-2), the vertical planes of the spiral air inlet channel inlet (3-1) and the tangential air inlet channel inlet (3-2) are perpendicular to the horizontal plane of the bottom surface of the cylinder cover (8), and the spiral air inlet channel outlet (6-1) and the tangential air inlet channel outlet (6-2) are symmetrically distributed left and right by taking a central axis of the cylinder cover (8) as a symmetrical axis;
The height H between the central axis of the helical air inlet channel inlet (3-1) and the plane of the helical air inlet channel outlet (6-1) is the same as the height H between the central axis of the tangential air inlet channel inlet (3-2) and the plane of the tangential air inlet channel outlet (6-2);
The lower side contour line (10) of the contour line formed by intersecting the vertical center plane of the direct current section (4) of the spiral air inlet channel (1) comprises a first inlet straight line section (10-1) and a first circular arc section (10-2) which are sequentially connected, wherein an included angle alpha 1 between the first inlet straight line section (10-1) and the vertical plane where the spiral air inlet channel inlet (3-1) is positioned is 85-90 degrees; the ratio of the radius R1 of the first circular arc section (10-2) to the radius R1 of the spiral inlet channel outlet (6-1) is 2.3-2.7, the included angle beta 1 between the tangent line of the first circular arc section (10-2) at the position of the spiral inlet channel outlet (6-1) and the normal direction of the plane of the spiral inlet channel outlet (6-1) is 20-30 degrees, the connecting circular arc radius R2 between the first inlet straight line section (10-1) and the first circular arc section (10-2) is 4-6mm, and the connecting circular arc radius R3 between the first circular arc section (10-2) and the spiral inlet channel outlet (6-1) is 4-6mm;
The upper side profile (11) of a profile line formed by intersecting the direct current section (4) of the spiral air inlet and the vertical central plane of the direct current section (4) of the spiral air inlet comprises a second inlet straight line section (11-1) and a second arc section (11-2) which are sequentially connected, wherein an included angle alpha 2 between the second inlet straight line section (11-1) and the vertical plane where the inlet (3-1) of the spiral air inlet is positioned is 85-90 degrees; the ratio of the radius R4 of the second circular arc section (11-2) to the radius R1 of the outlet (6-1) of the spiral inlet channel is 10-12; the intersection of the second inlet straight line segment (11-1) and the second circular arc segment (11-2) is tangentially arranged;
The ratio of the outer radius R5 of the spiral casing of the spiral section (5) of the spiral inlet and the radius R1 of the spiral inlet outlet (6-1) is 1.1-1.2, the ratio of the inner radius R6 of the spiral casing of the spiral section (5) of the spiral inlet and the radius R1 of the spiral outlet (6-1) of the spiral inlet is 0.5-0.7, and the ratio of the height G of the spiral chamber of the spiral section (5) of the spiral inlet and the height H of the horizontal central axis of the spiral inlet (3-1) from the plane of the spiral inlet outlet (6-1) is 0.6-0.8;
The lower side contour line (12) of the contour line formed by intersecting the tangential air inlet (2) and the vertical center plane of the tangential air inlet comprises a third inlet straight line segment (12-1) and an outlet straight line segment (12-2), the outlet straight line segment (12-2) is connected with the third inlet straight line segment (12-1) through a connecting circular arc, and an included angle alpha 3 between the third inlet straight line segment (12-1) and the vertical plane where the tangential air inlet (3-2) is positioned is 85-90 degrees; the included angle gamma between the outlet straight line section (12-2) and the horizontal plane where the tangential air inlet outlet (6-2) is positioned is 40-48 degrees, the ratio of the arc radius R7 of the connecting arc to the radius R2 of the tangential air inlet outlet (6-2) is 1.8-2.5, and the connecting arc radius R8 between the outlet straight line section (12-2) and the tangential air inlet outlet (6-2) is 4-6mm;
The upper side profile (13) of a profile line formed by intersecting the tangential air inlet (2) and the vertical central plane of the tangential air inlet comprises a fourth inlet straight line section (13-1) and a third circular arc section (13-2) which are sequentially connected, and an included angle alpha 4 between the fourth inlet straight line section (13-1) and the vertical plane where the tangential air inlet (3-2) is positioned is 85-90 degrees; the ratio of the radius R9 of the third circular arc section (13-2) to the radius R2 at the tangential air inlet outlet (6-2) is 5-6, the included angle beta 2 between the tangent line of the third circular arc section (13-2) at the tangential air inlet outlet (6-2) and the normal of the horizontal plane where the tangential air inlet outlet (6-2) is located is 5-15 degrees, the ratio of the connecting circular arc radius R10 between the third circular arc section (13-2) and the fourth inlet straight line section (13-1) to the radius R2 at the tangential air inlet outlet (6-2) is 6-7, and the connecting circular arc radius R11 between the third circular arc section (13-2) and the tangential air inlet outlet (6-2) is 4-6mm.
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| CN209855932U (en) * | 2019-01-22 | 2019-12-27 | 天津大学 | Composite air inlet channel for igniting engine by using gasoline on the basis of diesel engine |
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2019
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|---|---|---|---|---|
| US4312309A (en) * | 1978-09-25 | 1982-01-26 | Toyota Jidosha Kogyo Kabushiki Kaisha | Helically-shaped intake port of an internal combustion engine |
| DE10120303A1 (en) * | 2000-05-04 | 2001-11-08 | Avl List Gmbh | Internal combustion engine has start of spiral tongue spaced from valve middle point by distance equalling about 95 per cent plus or minus 5 per cent of internal diameter of valve seat |
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