CN111550823B - Ignition device for spraying constant-volume combustion bomb - Google Patents
Ignition device for spraying constant-volume combustion bomb Download PDFInfo
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- CN111550823B CN111550823B CN202010313740.6A CN202010313740A CN111550823B CN 111550823 B CN111550823 B CN 111550823B CN 202010313740 A CN202010313740 A CN 202010313740A CN 111550823 B CN111550823 B CN 111550823B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
- 238000005507 spraying Methods 0.000 title description 10
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 35
- 239000010937 tungsten Substances 0.000 claims abstract description 35
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 14
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract 2
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 230000008439 repair process Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q3/00—Igniters using electrically-produced sparks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spark Plugs (AREA)
Abstract
The invention discloses an ignition device for a spray constant volume combustion bomb, which comprises a positioning sleeve (4), an outer hexagonal bolt head (2) made of polytetrafluoroethylene and a tungsten needle (1) playing a role in conducting and discharging; the outer hexagon bolt comprises an outer hexagon bolt head (2), wherein a cylinder which is coaxially arranged is arranged on one end face of the outer hexagon bolt head (2), a bolt head thread part (3) is arranged in the circumferential direction of the cylinder, two tungsten needles (1) with set included angles penetrate through the outer hexagon bolt head (2), and the two tungsten needles (1) are positioned and fixed through a plurality of positioning sleeves (4) which are arranged at intervals. The opposed electrodes in the traditional constant volume combustion bomb are changed into the same-side inclined arrangement, and the mounting bolt head made of polytetrafluoroethylene and the heat-resistant insulating positioning sleeve are used for fixing the electrodes and controlling the distance between the electrodes, so that the defects that the traditional opposed ignition needle ignition mode is easy to vibrate and damage when applied to a spray volume bomb are overcome.
Description
Technical Field
The invention belongs to the technical field of engine spray combustion regulation and control, and particularly relates to an ignition device for a spray constant-volume combustion bomb.
Background
A Constant Volume Combustion Bomb (CVCB) is an experimental device mainly used for simulating the combustion process of an internal combustion engine in the vicinity of the Top Dead Center (TDC) of a piston. The structure of constant volume burning bomb is comparatively simple and easy, and the combustion chamber volume is fixed, can bear higher temperature and pressure. In actual operation, a compression process is not carried out, various thermodynamic parameters of the mixed gas are preset, and the mixed gas is directly ignited through a built-in ignition needle. Besides the advantages of simple structure, convenient adjustment of thermodynamic parameters of mixed gas and the like, the constant-volume combustion bomb is generally provided with an observation window so that researchers can obtain a good visual field.
The spraying constant volume combustion bomb is based on the original laminar flow constant volume combustion bomb, an oil injection system is added, and an oil injector is used for injecting oil, so that macroscopic and microscopic characteristics of fuel spraying of gasoline PFI injection, GDI in-cylinder direct injection and diesel in-cylinder injection can be observed and researched, the fuel spraying can also be used as an important means for regulating and controlling the combustion process, the combustion conditions of fuels under various conditions of different global equivalence ratios, different premixing ratios, different fuel types and the like can be observed, and the spraying constant volume combustion bomb is closer to the combustion process of an actual internal combustion engine.
With the continuous expansion and deepening of research content, the ignition mode of the constant volume burning bomb also begins to be enriched. Traditional constant volume burning bullet is by two built-in opposition ignition needle direct ignition, and the structure is comparatively simple and easy, nevertheless appears igniting unstable condition easily to the ignition needle receives the air current influence in the combustion process, appears vibrating even damage easily. The other scheme is that an electric spark plug is arranged on the wall surface of the bomb-accommodating combustion chamber by referring to the arrangement of an actual engine, but the mode does not solve the defects of an opposite ignition mode of an ignition needle, and the problems that the ignition is unstable due to the fact that an electrode is easy to age and damage, heat loss is caused by the fact that heat conduction between a metal electrode and the combustion chamber is avoided, and the like exist. In recent years, with the intensive research on rocket engines, Laser Induced Plasma Ignition (LIPI) has been attracting attention, which is an ignition method that performs ignition by the interaction of Laser Induced Plasma (LIP) and combustible gas, and has the following advantages compared to the conventional ignition method: ignition can be realized in a larger equivalence ratio range, and the research on lean combustion and lean combustion regulation and control technologies is facilitated; the ignition position can be quickly and accurately adjusted by matching with an optical system; the metal electrode structure in the traditional ignition mode is abandoned, and the flameout condition and the unstable working condition caused by the aging, deformation and damage of the electrode and the heat conduction of the wall surface of the combustion chamber are effectively avoided; an ignition-diagnosis integrated design and the like can be realized. However, LIPI has high requirements on equipment conditions, a system is complex, and cost is high.
Develop fuel spray combustion characteristic research on spraying constant volume burning bullet, ignition is indispensable, and the inside air current of appearance bullet that is guided by the spraying process flows very obviously, and after the spraying combustion process, the inside flow field motion of appearance bullet is violent, if use traditional opposite firing needle ignition mode, the firing needle takes place the vibration very easily, warp even the rupture damage, warp the back electrode spacing increase also can further lead to the ignition unstability. Therefore, it is necessary to improve the conventional opposed ignition needle ignition method, not only to retain the original advantages thereof as much as possible, but also to improve and compensate the deficiencies of the conventional opposed ignition needle ignition method in view of the requirement of carrying out the research on the fuel spray combustion characteristics on the spray constant volume combustion bomb.
Disclosure of Invention
The invention aims to provide an ignition device for a spray constant-volume combustion bomb, aiming at the problems of the defects of the prior art, the limitation of experimental equipment conditions and the like.
The invention is realized by adopting the following technical scheme:
an ignition device used on a spray constant volume combustion bomb comprises a positioning sleeve, an outer hexagonal bolt head made of polytetrafluoroethylene and a tungsten needle playing a role in conducting electric discharge; the outer hexagon bolt head comprises an outer hexagon bolt head and is characterized in that a cylinder which is coaxially arranged is arranged on one end face of the outer hexagon bolt head, the circumferential direction of the cylinder is a bolt head thread part, two tungsten needles with set included angles penetrate through the outer hexagon bolt head, and the two tungsten needles are positioned and fixed through a plurality of positioning sleeves which are arranged at intervals.
The invention is further improved in that two end faces of the outer hexagonal bolt head are respectively provided with a positioning sleeve.
The invention has the further improvement that the included angle between the two tungsten needles is 1-3 degrees, and the distance between the tips is 2 mm.
The invention is further improved in that the diameter of the tungsten needle is 0.5-1 mm.
A further improvement of the invention is that the locating sleeve is made of an adhesive repair agent.
A further improvement of the invention is that the threaded portion of the bolt head is tapered.
The invention has at least the following beneficial technical effects:
the opposed electrodes in the traditional constant volume combustion bomb are changed into the same-side inclined arrangement, and the mounting bolt head made of polytetrafluoroethylene and the heat-resistant insulating positioning sleeve are used for fixing the electrodes and controlling the distance between the electrodes, so that the defects that the traditional opposed ignition needle ignition mode is easy to vibrate and damage when applied to a spray volume bomb are overcome. Compared with the prior art, the invention has the following advantages:
1. the common electrode of the constant-volume combustion bomb is changed into the same-side arrangement mode from the opposite arrangement mode, so that the installation space can be saved, the requirement of the opposite electrode on the coaxiality can be eliminated, and the processing difficulty and the requirement of the bomb and the electrode are reduced.
2. The electrodes arranged on the same side are fixed at a plurality of positions in the design scheme, vibration generated by airflow influence of the electrodes in the spraying and combustion processes is reduced, the possibility of deformation and even breakage caused by overlarge vibration amplitude of the electrodes can be reduced, the fixation of the distance between the two electrodes can be ensured, and short circuit caused by electrode short circuit is prevented.
3. The design scheme uses two bonding healant with different properties to manufacture the positioning sleeve for fixing and sealing, can ensure that the positioning sleeve does not crack, excessively deform and denature after multiple ignition and combustion processes, and improves the durability of the ignition device.
4. The manufacturing process is simple, and the matched die can quickly remove carbon deposition, replace and fix the electrode.
Drawings
Fig. 1 and fig. 2 are schematic structural diagrams of an ignition device used on a spray constant volume combustion bomb in two different angles respectively.
Description of reference numerals:
1-tungsten needle, 2-outer hexagonal bolt head, 3-bolt head thread part and 4-positioning sleeve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the ignition device for a spray constant volume bomb provided by the present invention has the following steps (the partial installation dimension in the drawings and the steps is matched with a specific bomb, and can be adjusted according to actual conditions):
(1) and (5) manufacturing bolts. An external hexagonal bolt head 2 (with a threaded portion 3 of the bolt head) is made of teflon. The polytetrafluoroethylene has good plasticity, insulativity and heat resistance, and low cost, and is an ideal material for manufacturing the outer hexagonal bolt head 2. The installation size and the installation operability should be considered when designing and manufacturing the outer hexagon bolt head 2, the size of the bolt head thread part 3 should be matched with the relative size of the elastic container, a taper angle thread is suggested, the thread has certain sealing performance after being installed, and if a common thread is used, a sealing washer or a gasket should be added during the installation.
(2) And (6) drilling. Two through holes which are positioned on the same horizontal plane and have slight angles are drilled in the center of the outer hexagonal bolt head 2. The diameter of the through hole is determined according to the diameter of the tungsten needle, and the tungsten needle with the diameter within the range of 0.5-1mm is recommended to be used, so that better breakdown performance and ignition stability can be ensured. The through hole spacing is not less than 3 mm. The included angle between the two through holes is equal to or slightly larger than the included angle between the tungsten needles during design, so that the tungsten needles are convenient to mount and fix.
(3) And (6) installing a tungsten needle. And (3) polishing the selected tungsten needle 1, inserting the polished tungsten needle into the through hole of the outer hexagon bolt head 2, and adjusting the exposed length of the tungsten needles on two sides to enable the tip of the tungsten needle on the inner side to be present in the bomb accommodating window after installation and to be on the same plane with the installation position of the fuel injector. The exposed length of the outer side is recommended to be about 50mm so as to be convenient for being connected with the positive electrode and the negative electrode of the high-voltage pulse ignition system in use.
(4) The tungsten needle is fixed and arranged with the locating sleeve. Keeping two tungsten needles on the same horizontal plane, finely adjusting the position and the direction of the tungsten needles to enable an included angle between the two tungsten needles to be 1-3 degrees, and controlling the distance between the tips of the two tungsten needles to be about 2mm so as to ensure the ignition stability of the tungsten needles. In the positions shown in fig. 1 and 2, the positioning sleeves 4 are made of the adhesion repairing agent, the distance is controlled to be about 20-30mm, and the process is as follows: firstly, uniformly mixing 300-degree-resistant adhesion repairing agent according to a certain proportion, coating the surface of a tungsten needle within a specified operation time, connecting two tungsten needles, controlling the coating thickness to be about 1mm, standing for more than 24 hours at room temperature to ensure that the repairing agent is completely cured, then coating 1800-degree-resistant adhesion repairing agent on the surface of a low-temperature repairing agent according to the same operation flow, controlling the coating thickness to be about 1mm, and similarly standing for more than 24 hours at room temperature. The reason for using two different temperature-resistant mending agents to manufacture the positioning sleeve is that the method can ensure that the mending agent is not deformed or damaged or loosened or slid due to high temperature to the greatest extent. Note that the exposed length of the tip of the tungsten needle should be controlled to be about 2mm, and the surface of the healant after curing should be as flat as possible. The same treatment is also carried out at the front and the rear parts of the tungsten needle extending out of the bolt so as to play a role in sealing. The properties and use parameters of the two bond repair agents are shown in the following table.
(5) And (6) mounting. After the visual inspection and the power-on test are finished, thread sealant is coated on threads of the containing bomb and the ignition device, the ignition device is installed on the containing bomb, and the two tungsten needles are respectively connected with the positive pole and the negative pole of the high-voltage pulse ignition device, so that the test and the experiment can be carried out.
Through tests, the ignition device manufactured by using the parameters and the process can generate point discharge when the voltage is higher than 5kV after the high-energy pulse ignition system is switched on, the discharge position is stable, and the phenomena of cracking or breakdown of the positioning sleeve, deformation or damage of the tungsten needle and the like do not occur after multiple power-on tests.
Claims (2)
1. An ignition device used on a spray constant volume combustion bomb is characterized by comprising a positioning sleeve (4), an outer hexagonal bolt head (2) made of polytetrafluoroethylene and a tungsten needle (1) playing a role in conducting and discharging electricity; wherein,
one end face of the outer hexagonal bolt head (2) is provided with a cylinder which is coaxially arranged, the circumference of the cylinder is a bolt head thread part (3), two tungsten needles (1) with set included angles penetrate through the outer hexagonal bolt head (2), and the two tungsten needles (1) are positioned and fixed through a plurality of positioning sleeves (4) which are arranged at intervals;
the included angle between the two tungsten needles (1) is 1-3 degrees, the distance between the tips is 2mm, and the diameter of the tungsten needle (1) is 0.5-1 mm;
two end surfaces of the outer hexagonal bolt head (2) are respectively provided with a positioning sleeve (4);
the bolt head thread part (3) adopts taper angle threads.
2. An ignition device for a spray constant volume bomb as claimed in claim 1, characterised in that the locating sleeve (4) is made of an adhesive repair agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010313740.6A CN111550823B (en) | 2020-04-20 | 2020-04-20 | Ignition device for spraying constant-volume combustion bomb |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010313740.6A CN111550823B (en) | 2020-04-20 | 2020-04-20 | Ignition device for spraying constant-volume combustion bomb |
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| CN111550823A CN111550823A (en) | 2020-08-18 |
| CN111550823B true CN111550823B (en) | 2021-12-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113203102A (en) * | 2021-04-30 | 2021-08-03 | 上海交通大学 | Electrode gap adjustable discharging device and working method |
| CN114777154B (en) * | 2022-04-22 | 2023-11-10 | 江油神光石英科技有限公司 | Ignition device for inflammable and explosive gas |
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| ES1004776U (en) * | 1987-10-08 | 1988-10-16 | Fosforera Espanola, S.A. | Improved valve for gas lighters. (Machine-translation by Google Translate, not legally binding) |
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