CN109238922A - A kind of diesel injector shear stability tester - Google Patents
A kind of diesel injector shear stability tester Download PDFInfo
- Publication number
- CN109238922A CN109238922A CN201811111257.9A CN201811111257A CN109238922A CN 109238922 A CN109238922 A CN 109238922A CN 201811111257 A CN201811111257 A CN 201811111257A CN 109238922 A CN109238922 A CN 109238922A
- Authority
- CN
- China
- Prior art keywords
- hopper
- lateral wall
- cooler
- fixedly installed
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 239000007921 spray Substances 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 230000009977 dual effect Effects 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000010992 reflux Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a kind of diesel injector shear stability testers, including bottom plate, multiple universal wheels are uniformly installed on the bottom wall of bottom plate, driving motor is fixedly installed on the roof of bottom plate, the driving end of driving motor is fixedly connected with dual Piston jet pump, pump speed adjusting screw and pump Exhaust screw are fixedly installed on the lateral wall of dual Piston jet pump, stroke type counter is connected on dual Piston jet pump, mounting rack is fixedly installed on the roof of bottom plate, nozzle and spray chamber are fixedly installed on the lateral wall on mounting rack top, the bottom end of spray chamber is connected with spray chamber outlet and evacuated tube, the reflux pipeline of excess liquid is connected on nozzle.Spray chamber and cooling device are tightly connected by the present invention using the first sealing plate and the second sealing plate, are tightly connected cooling device and hopper using sealing-plug, so as to improve the leakproofness of diesel injector shear stability tester, are improved the accuracy of test.
Description
Technical field
The present invention relates to petroleum technology field more particularly to a kind of diesel injector shear stability testers.
Background technique
Containing polymeric oil under certain shear rate, by the diesel fuel nozzle of diesel injector shear stability meter,
Promote the polymer molecule depolymerization that wherein shear stability is poor, reduce the kinematic viscosity of sample, to report style initial 100
The decline percentage of degree Celsius kinematic viscosity measures the shear stability containing polymeric oil.
The existing cooling device for diesel injector shear stability tester and spray chamber and cooling device and reservoir
The connection sealing of slot is mostly poor, therefore air is easily accessible in style and forms bubble, to cause experimental error, needs pair
This makes improvements.
Summary of the invention
It is larger the purpose of the present invention is to solve diesel injector shear stability tester error is used in the prior art
The problem of, and a kind of diesel injector shear stability tester proposed.
To achieve the goals above, present invention employs following technical solutions:
A kind of diesel injector shear stability tester, including bottom plate are uniformly equipped on the bottom wall of the bottom plate multiple
Universal wheel is fixedly installed with driving motor on the roof of the bottom plate, and the driving end of the driving motor is fixedly connected with dual-active
Plug jet pump is fixedly installed with pump speed adjusting screw and pump Exhaust screw, institute on the lateral wall of the dual Piston jet pump
It states and is connected with stroke type counter on dual Piston jet pump, mounting rack, the peace are fixedly installed on the roof of the bottom plate
It shelves and is fixedly installed with nozzle and spray chamber on the lateral wall on top, the bottom end of the spray chamber is connected with spray chamber outlet and row
Blank pipe, the reflux pipeline of excess liquid is connected on the nozzle, and the bottom end of the spray chamber is equipped with cooling device, the cooling
The bottom end of device is connected with the stop,threeway of cooler outlet, and the bottom end of the stop,threeway of the cooler outlet is connected with reservoir
Slot, the bottom end of the hopper are connected with the stop,threeway of hopper outlet, and the stop,threeway of the hopper outlet is far from storage
One end of liquid bath is connected with connecting tube, and connecting tube is fixedly mounted on the input terminal of dual Piston jet pump, the dual Piston
The output end of jet pump is fixedly installed with the high pressure resistant pipeline from pump to injector, the high pressure resistant pipeline from pump to injector
On be connected with pressure sensor device.
Preferably, the cooling device includes the first sealing plate being fixedly mounted on mounting rack lateral wall, and spray chamber
Outlet, the reflux pipeline of excess liquid and evacuated tube extend through the first sealing plate and extend to the downside of the first sealing plate, institute
The bottom end for stating the first sealing plate is equipped with cooler, is fixedly installed with the second sealing plate on the roof of the cooler, and described first
Sealing device is equipped between sealing plate and the second sealing plate, lateral wall of second sealing plate close to mounting rack one end is equipped with
It is inserted with cooling water inlet and water outlet, the cooling respectively on the lateral wall on mobile device, the cooler bottom end and top
Part flow arrangement is equipped in device.
Preferably, the sealing device includes the annular link block being fixedly mounted on the second sealing plate roof, and described
Offered on the bottom wall of one sealing plate with the mutually matched annular link slot of annular link block, on the roof of the annular link slot
It is fixedly installed with seal washer.
Preferably, the mobile device includes the movable block being fixedly mounted on the second sealing plate lateral wall, the installation
Frame offers and the mutually matched mounting groove of movable block, the outside of the movable block on the lateral wall of second sealing plate one end
Threaded rod is fixedly installed on wall, and threaded rod runs through the inner sidewall of mounting groove and extends to the outside of mounting rack, the installation
It is offered on the lateral wall of frame and the mutually matched loose slot of threaded rod.
Preferably, fastening nut is threaded on the lateral wall of the threaded rod tip, and the diameter of fastening nut is big
In the width of loose slot.
Preferably, the part flow arrangement includes the mounting rod being plugged in cooler, on the lateral wall of the mounting rod
It is even that multiple first fixed links are installed, and the first fixed link is respectively and fixedly installed to the inside of cooler far from one end of mounting rod
On wall, multiple deflectors are uniformly installed on the lateral wall of the mounting rod.
Preferably, it is equipped with distribution plate in the hopper, is fixedly installed with the second fixed link on the bottom wall of the distribution plate,
And second fixed link be fixedly mounted on the inner sidewall of hopper far from one end of distribution plate, the top of the hopper is equipped with close
Blocking, and the bottom end of the stop,threeway of cooler outlet through sealing-plug and extends in hopper, the bottom wall of the sealing-plug
On be fixedly installed with thermometer, and thermometer through hopper roof and extend in hopper.
Preferably, the bottom end fixation of the stop,threeway of the cooler outlet is plugged on the roof of hopper, described close
Offered on the roof of blocking with the mutually matched notch of the stop,threeway of cooler outlet, open up on the roof of the hopper
Have and thermometer mutual cooperation slot.
Compared with prior art, the method have the advantages that:
1, spray chamber and cooling device are tightly connected using the first sealing plate and the second sealing plate, it will be cold using sealing-plug
But device and hopper are tightly connected, and so as to improve the leakproofness of diesel injector shear stability tester, improve test
Accuracy；
2, cooler can move freely, and can not only guarantee the leakproofness of spray chamber and cooling device, and convenient for pair
Spray chamber and cooler carry out maintenance and repair；
3, sealing-plug can move freely, and can not only guarantee the leakproofness of cooling device and hopper, but also can be square
Just mobile thermometer, prevents thermometer from impacting to the volume in hopper.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of diesel injector shear stability tester proposed by the present invention；
Fig. 2 is a kind of enlarged drawing of the part A structure of diesel injector shear stability tester proposed by the present invention；
Fig. 3 is a kind of enlarged drawing of the part B structure of diesel injector shear stability tester proposed by the present invention.
In figure: 1 bottom plate, 2 universal wheels, 3 driving motors, 4 dual Piston jet pumps, 5 pump speed adjusting screws, 6 pump exhaust spiral shells
Silk, the outlet of 7 stroke type counters, 8 mounting racks, 9 nozzles, 10 spray chambers, 11 spray chambers, the reflux pipeline of 12 excess liquids, 13
Evacuated tube, 14 first sealing plates, 15 coolers, 16 second sealing plates, 17 annular link blocks, 18 seal washers, 19 movable blocks, 20
Mounting groove, 21 threaded rods, 22 loose slots, 23 cooling water inlets, 24 water outlets, 25 mounting rods, 26 first fixed links, 27 water conservancy diversion
Plate, the stop,threeway of 28 cooler outlets, 29 hoppers, 30 distribution plates, 31 second fixed links, 32 sealing-plugs, 33 thermometers, 34
Stop,threeway, 35 connecting tubes, 36 high pressure resistant pipeline, 37 pressure sensor devices from pump to injector of hopper outlet.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1-3, a kind of diesel injector shear stability tester, including bottom plate 1 are uniformly pacified on the bottom wall of bottom plate 1
Equipped with multiple universal wheels 2, bottom plate 1 easy to remove is fixedly installed with driving motor 3, the drive of driving motor 3 on the roof of bottom plate 1
Moved end is fixedly connected with dual Piston jet pump 4, and pump speed adjusting screw is fixedly installed on the lateral wall of dual Piston jet pump 4
5 and pump Exhaust screw 6, stroke type counter 7 is connected on dual Piston jet pump 4, and peace is fixedly installed on the roof of bottom plate 1
8 are shelved, nozzle 9 and spray chamber 10 are fixedly installed on the lateral wall on 8 top of mounting rack, the bottom end of spray chamber 10 is connected with atomization
Room exports 11 and evacuated tube 13, and the reflux pipeline 12 of excess liquid is connected on nozzle 9, and the bottom end of spray chamber 10 is equipped with cooling dress
It sets, cooling device includes the first sealing plate 14 being fixedly mounted on 8 lateral wall of mounting rack, and spray chamber exports 11, superfluous liquid
The reflux pipeline 12 and evacuated tube 13 of body extend through the first sealing plate 14 and extend to the downside of the first sealing plate 14, and first is close
The bottom end of sealing plate 14 is equipped with cooler 15, is fixedly installed with the second sealing plate 16, the first sealing plate 14 on the roof of cooler 15
And second be equipped with sealing device between sealing plate 16, sealing device includes the annular being fixedly mounted on 16 roof of the second sealing plate
Link block 17, offer on the bottom wall of the first sealing plate 14 with the mutually matched annular link slot of annular link block 17, annular is even
It is fixedly installed with seal washer 18 on the roof of access slot, annular link block 17 is inserted into annular link slot, and make annular connection
Block 17 and seal washer 18 are in close contact, so that it may seal the first sealing plate 14 and the second sealing plate 16.
Lateral wall of second sealing plate 16 close to 8 one end of mounting rack is equipped with mobile device, and mobile device includes fixed peace
Movable block 19 on 16 lateral wall of the second sealing plate, mounting rack 8 open up on the lateral wall of 16 one end of the second sealing plate
Have with the mutually matched mounting groove 20 of movable block 19, be fixedly installed with threaded rod 21, and threaded rod on the lateral wall of movable block 19
21 run through the inner sidewall of mounting groove 20 and extend to the outside of mounting rack 8, offer and threaded rod 21 on the lateral wall of mounting rack 8
Mutually matched loose slot 22 is threaded with fastening nut, and the diameter of fastening nut on the lateral wall on 21 top of threaded rod
Greater than the width of loose slot 22, cooler 15 is moved up, movable block 19 and threaded rod 21 follow cooler 15 installing respectively
It is moved in slot 20 and loose slot 22, until annular link block 17 is in close contact with seal washer 18, then again by fastening nut spiral shell
Line is connected on the lateral wall on 21 top of threaded rod, and is in close contact the lateral wall of fastening nut and mounting rack 8, thus can
With threaded rod 21, movable block 19 and cooler 15 is fixed.
It is inserted with cooling water inlet 23 and water outlet 24, cooler 15 respectively on the lateral wall on 15 bottom end of cooler and top
Interior to be equipped with part flow arrangement, part flow arrangement includes the mounting rod 25 being plugged in cooler 15, on the lateral wall of mounting rod 25 uniformly
Multiple first fixed links 26 are installed, and the first fixed link 26 is respectively and fixedly installed to cooler 15 far from one end of mounting rod 25
Inner sidewall on, multiple deflectors 27 are uniformly installed, fluid is through spray chamber outlet 11, superfluous liquid on the lateral wall of mounting rod 25
After the reflux pipeline 12 and evacuated tube 13 of body enter cooler 15, fluid can be contacted with deflector 27, thus enable a fluid to
The inner sidewall of cooler 15 is in close contact, so as to which fluid to be quickly cooled down.
The bottom end of cooling device is connected with the stop,threeway 28 of cooler outlet, the bottom of the stop,threeway 28 of cooler outlet
End is connected with hopper 29, and distribution plate 30 is equipped in hopper 29, is fixedly installed with the second fixed link on the bottom wall of distribution plate 30
31, and the second fixed link 31 is fixedly mounted on the inner sidewall of hopper 29 far from one end of distribution plate 30, the top of hopper 29
End is equipped with sealing-plug 32, and the bottom end of the stop,threeway 28 of cooler outlet through sealing-plug 32 and extends in hopper 29,
Thermometer 33 is fixedly installed on the bottom wall of sealing-plug 32, and thermometer 33 runs through the roof of hopper 29 and extends to hopper
In 29, the bottom end fixation of the stop,threeway 28 of cooler outlet is plugged on the roof of hopper 29, on the roof of sealing-plug 32
The mutually matched notch of stop,threeway 28 with cooler outlet is offered, is offered and thermometer 33 on the roof of hopper 29
Mutual cooperation slot, sealing-plug 32 can move freely, and can not only guarantee the leakproofness of cooling device Yu hopper 29, but also
The mobile thermometer 33 that can be convenient, prevents thermometer 33 from impacting to the volume in hopper 29.
The bottom end of hopper 29 is connected with the stop,threeway 34 of hopper outlet, and the stop,threeway 34 of hopper outlet is separate
One end of hopper 29 is connected with connecting tube 35, and connecting tube 35 is fixedly mounted on the input terminal of dual Piston jet pump 4, dual-active
The output end of plug jet pump 4 is fixedly installed with the high pressure resistant pipeline 36 from pump to injector, from pump to the high pressure resistant of injector
Pressure sensor device 37 is connected on pipeline 36.
In present invention, it is desirable to moving up cooler 15, movable block 19 and spiral shell when cooling device and spray chamber 10 are sealed
Rasp bar 21 follows cooler 15 to move in mounting groove 20 and loose slot 22 respectively, until annular link block 17 and seal washer 18
It is in close contact, then fastening nut is threaded on the lateral wall on 21 top of threaded rod again, and make fastening nut and installation
The lateral wall of frame 8 is in close contact, so that threaded rod 21, movable block 19 and cooler 15 is fixed, fluid through spray chamber outlet 11,
After the reflux pipeline 12 and evacuated tube 13 of excess liquid enter cooler 15, fluid can be contacted with deflector 27, to make fluid
It can be in close contact with the inner sidewall of cooler 15, so as to which fluid to be quickly cooled down；When needing mobile thermometer 33, only
Need to move up sealing-plug 32, sealing-plug 32 is moved up along the stop,threeway 28 of cooler outlet, thus with dynamic temperature
Meter 33 moves up, and the complete operation of this tester just repeats no more here.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of diesel injector shear stability tester, including bottom plate (1), it is characterised in that: on the bottom wall of the bottom plate (1)
It is uniformly equipped with multiple universal wheels (2), is fixedly installed with driving motor (3), the driving motor on the roof of the bottom plate (1)
(3) driving end is fixedly connected with dual Piston jet pump (4), fixed peace on the lateral wall of the dual Piston jet pump (4)
Equipped with pump speed adjusting screw (5) and pump Exhaust screw (6), stroke type counter is connected on the dual Piston jet pump (4)
(7), it is fixedly installed with mounting rack (8) on the roof of the bottom plate (1), fixed peace on the lateral wall on mounting rack (8) top
Equipped with nozzle (9) and spray chamber (10), the bottom end of the spray chamber (10) is connected with spray chamber outlet (11) and evacuated tube (13),
The reflux pipeline (12) of excess liquid is connected on the nozzle (9), the bottom end of the spray chamber (10) is equipped with cooling device, institute
The bottom end for stating cooling device is connected with the stop,threeway of cooler outlet (28), the stop,threeway (28) of the cooler outlet
Bottom end is connected with hopper (29), and the bottom end of the hopper (29) is connected with the stop,threeway (34) of hopper outlet, described
The stop,threeway (34) of hopper outlet is connected with connecting tube (35) far from the one end of hopper (29), and connecting tube (35) is fixed
Be mounted on the input terminal of dual Piston jet pump (4), the output end of the dual Piston jet pump (4) be fixedly installed with from pump to
The high pressure resistant pipeline (36) of injector, it is described to be connected with pressure sensor device from pump to the high pressure resistant pipeline (36) of injector
(37)。
2. a kind of diesel injector shear stability tester according to claim 1, it is characterised in that: the cooling device
Including the first sealing plate (14) being fixedly mounted on mounting rack (8) lateral wall, and spray chamber exports time of (11), excess liquid
Flow tube line (12) and evacuated tube (13) extend through the first sealing plate (14) and extend to the downside of the first sealing plate (14), described
The bottom end of first sealing plate (14) is equipped with cooler (15), is fixedly installed with the second sealing plate on the roof of the cooler (15)
(16), sealing device is equipped between first sealing plate (14) and the second sealing plate (16), second sealing plate (16) is leaned on
The lateral wall of nearly mounting rack (8) one end is equipped with mobile device, on the lateral wall on cooler (15) bottom end and top respectively
It is inserted with cooling water inlet (23) and water outlet (24), is equipped with part flow arrangement in the cooler (15).
3. a kind of diesel injector shear stability tester according to claim 2, it is characterised in that: the sealing device
Including the annular link block (17) being fixedly mounted on the second sealing plate (16) roof, on the bottom wall of first sealing plate (14)
Offer with the mutually matched annular link slot of annular link block (17), be fixedly installed on the roof of the annular link slot close
Seal washer (18).
4. a kind of diesel injector shear stability tester according to claim 2, it is characterised in that: the mobile device
Including the movable block (19) being fixedly mounted on the second sealing plate (16) lateral wall, the mounting rack (8) is close to the second sealing plate
(16) it is offered on the lateral wall of one end and movable block (19) mutually matched mounting groove (20), the outside of the movable block (19)
It is fixedly installed on wall threaded rod (21), and threaded rod (21) runs through the inner sidewall of mounting groove (20) and extends to mounting rack (8)
Outside, offer on the lateral wall of the mounting rack (8) and threaded rod (21) mutually matched loose slot (22).
5. a kind of diesel injector shear stability tester according to claim 4, it is characterised in that: the threaded rod
(21) fastening nut is threaded on the lateral wall on top, and the diameter of fastening nut is greater than the width of loose slot (22).
6. a kind of diesel injector shear stability tester according to claim 2, it is characterised in that: the part flow arrangement
Including the mounting rod (25) being plugged in cooler (15), multiple first are uniformly equipped on the lateral wall of the mounting rod (25)
Fixed link (26), and the first fixed link (26) is respectively and fixedly installed to the inside of cooler (15) far from the one end of mounting rod (25)
On wall, multiple deflectors (27) are uniformly installed on the lateral wall of the mounting rod (25).
7. a kind of diesel injector shear stability tester according to claim 1, it is characterised in that: the hopper
(29) distribution plate (30) are equipped in, are fixedly installed with the second fixed link (31) on the bottom wall of the distribution plate (30), and second is solid
Fixed pole (31) is fixedly mounted on the inner sidewall of hopper (29) far from the one end of distribution plate (30), the top of the hopper (29)
End is equipped with sealing-plug (32), and the bottom end of the stop,threeway (28) of cooler outlet through sealing-plug (32) and extends to hopper
(29) it in, is fixedly installed with thermometer (33) on the bottom wall of the sealing-plug (32), and thermometer (33) runs through hopper (29)
Roof and extend in hopper (29).
8. a kind of diesel injector shear stability tester according to claim 7, it is characterised in that: the cooler goes out
The bottom end fixation of the stop,threeway (28) of mouth is plugged on the roof of hopper (29), is opened up on the roof of the sealing-plug (32)
Have with the stop,threeway of cooler outlet (28) mutually matched notch, offer on the roof of the hopper (29) and temperature
Count (33) mutual cooperation slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811111257.9A CN109238922A (en) | 2018-09-22 | 2018-09-22 | A kind of diesel injector shear stability tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811111257.9A CN109238922A (en) | 2018-09-22 | 2018-09-22 | A kind of diesel injector shear stability tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109238922A true CN109238922A (en) | 2019-01-18 |
Family
ID=65056514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811111257.9A Pending CN109238922A (en) | 2018-09-22 | 2018-09-22 | A kind of diesel injector shear stability tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109238922A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161812A (en) * | 2020-09-04 | 2021-01-01 | 南京航空航天大学 | Fuel injection and atomized combustion test device suitable for large-gradient shear flow |
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|---|---|---|---|---|
| CN112161812A (en) * | 2020-09-04 | 2021-01-01 | 南京航空航天大学 | Fuel injection and atomized combustion test device suitable for large-gradient shear flow |
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