CN111257498A - Visual experiment simulation device for researching fuel droplet combustion characteristics under high pressure - Google Patents
Visual experiment simulation device for researching fuel droplet combustion characteristics under high pressure Download PDFInfo
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- CN111257498A CN111257498A CN202010099101.4A CN202010099101A CN111257498A CN 111257498 A CN111257498 A CN 111257498A CN 202010099101 A CN202010099101 A CN 202010099101A CN 111257498 A CN111257498 A CN 111257498A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 90
- 239000000446 fuel Substances 0.000 title claims abstract description 44
- 230000000007 visual effect Effects 0.000 title claims abstract description 18
- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000002474 experimental method Methods 0.000 title claims description 11
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 28
- 239000010431 corundum Substances 0.000 claims description 22
- 229910052593 corundum Inorganic materials 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 13
- 238000010892 electric spark Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000011160 research Methods 0.000 claims description 4
- 230000009897 systematic effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 23
- 230000006872 improvement Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
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- General Health & Medical Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- Food Science & Technology (AREA)
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a visual experimental simulation device for researching the combustion characteristics of fuel droplets under high pressure, which comprises a combustion chamber, wherein a perspective window is arranged on the cavity wall of the combustion chamber, a fuel droplet sampling assembly is arranged in the combustion chamber, the fuel droplets sampled by the sampling assembly are positioned in an area observed by the perspective window, an image acquisition module is also arranged at the outer side of the combustion chamber corresponding to the perspective window, and the image acquisition module acquires images of droplet combustion through the perspective window; the fuel droplet ignition device further comprises an ignition device unit acting on the fuel droplets, wherein the ignition device unit comprises a plurality of igniters igniting according to ignition modes of the fuel droplets. This device fuses the some firearm that has multiple ignition mode to same device, can simulate under the different operating modes droplet burning on the one hand, is convenient for carry out systematic collection to the combustion characteristic of droplet, guarantees the accuracy of experimental data.
Description
Technical Field
The invention belongs to the technical field of combustion experimental equipment, and particularly relates to a visual experimental simulation device for researching the combustion characteristics of fuel droplets under high pressure.
Background
The liquid fuel has high heat value, easy storage and transportation and high safety, and is widely applied to the automobile industry and the aerospace industry. The research on the ignition and combustion characteristics of a certain fuel single liquid drop has very important significance for the practical application of the fuel. In practical applications, fuel droplets often burn under high pressure, turbulence, and special atmosphere environments, and therefore, the ignition and ignition characteristics of liquid fuels must be studied in conjunction with specific conditions and conditions of use. The traditional simulation device can only be used for exploring a single working condition, the test result is not representative, the range is small, and the requirement is difficult to meet.
Disclosure of Invention
Aiming at the problems, the invention provides a visual experiment simulation device for researching the combustion characteristics of fuel droplets under high pressure.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
the utility model provides a visual experiment analogue means of fuel droplet burning characteristic under research high pressure, includes the combustion chamber, its characterized in that: the combustion chamber is characterized in that a perspective window is arranged on the wall of the combustion chamber cavity, a fuel droplet sampling assembly is arranged in the combustion chamber, fuel droplets sampled by the sampling assembly are positioned in an area observed by the perspective window, an image acquisition module and an irradiation light source are also arranged at the position, corresponding to the perspective window, of the outer side of the combustion chamber, and the image acquisition module acquires images of droplet combustion through the perspective window; the fuel droplet ignition device further comprises an ignition device unit acting on the fuel droplets, wherein the ignition device unit comprises a plurality of igniters igniting according to ignition modes of the fuel droplets.
As a further improvement of the invention, the ignition device comprises an electric spark igniter arranged in the combustion chamber, and the electric spark igniter is close to the lower end of the SiC fiber wire.
As a further improvement of the invention, the ignition device comprises a laser igniter, the laser igniter is arranged outside the combustion chamber, and laser emitted from the laser igniter passes through the transparent window to intersect with the lower end of the SiC fiber filament.
As a further improvement of the invention, the ignition device comprises a heating resistance wire arranged in the combustion chamber and a temperature sensor.
As a further improvement of the invention, the device also comprises a pressurizing unit, wherein the pressurizing unit comprises a gas compression device arranged at the tail end of the combustion chamber and a pressure sensor arranged inside the combustion chamber, and a gas control valve is arranged between the gas compression device and the combustion chamber.
As a further improvement of the present invention, the present invention further comprises a height adjustment support assembly, wherein the height adjustment support assembly comprises a first support, a second support and a third support, the first support is connected with the image acquisition module, the second support is connected with the irradiation light source, the third support is connected with the laser igniter, and the first support, the second support and the third support are lifting supports.
As a further improvement of the invention, the sampling assembly comprises a first corundum tube and a SiC fiber wire which are vertically arranged, and a sample feeding channel, wherein the upper end of the first corundum tube is fixed in the combustion chamber, the lower end of the first corundum tube is connected with the SiC fiber wire, the fuel liquid drop is hung at the lower end of the SiC fiber wire, one section of the sample feeding channel penetrates through the wall of the combustion chamber, and the extension direction of the sample feeding channel is intersected with the lower end of the SiC fiber wire.
As a further improvement of the invention, the device also comprises a second corundum tube and a thermocouple, wherein the second corundum tube is arranged in parallel with the first corundum tube, the thermocouple is connected to the lower end of the second corundum tube, and the end part of the thermocouple is almost coplanar with the lower end of the SiC fiber wire.
As a further improvement of the invention, the image acquisition module adopts a high-speed camera, and the image acquisition module is focused on the lower end of the SiC fiber wire.
As a further improvement of the invention, a plurality of fans are arranged in the combustion chamber.
The invention has the beneficial effects that:
1. the device can organically fuse igniters with various ignition modes into the same device, on one hand, the device can simulate the liquid drop combustion in different ignition modes, can further realize high-pressure, turbulent flow and special gas atmosphere environment, is convenient for systematically collecting the combustion characteristics of the liquid drops, and ensures the accuracy of experimental data; on the other hand, when the working condition is changed, the disassembly and the assembly are not required to be carried out again, the experiment flow is effectively simplified, and the preparation time before the experiment of scientific research personnel is reduced.
2. According to the invention, the height adjusting device which is integrally connected in the device is used for adjusting the height of the related equipment, so that the difficulty of focusing and light supplementing is reduced, and the risk of overturning of the auxiliary external equipment is reduced.
Drawings
FIG. 1 is a schematic view of a combustion chamber and base structure in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the combustion chamber, the plenum chamber and the power plant chamber of the preferred embodiment of the present invention;
FIG. 3 is a three-dimensional schematic representation of the structure of the body in a preferred embodiment of the invention;
FIG. 4 is a schematic view of a droplet suspension and temperature measurement mechanism in a preferred embodiment of the invention;
wherein: 1. the device comprises a base, 2, a first support, 3, a second support, 4, a third support, 5, an image acquisition module, 6, an irradiation light source, 7, a laser igniter, 8, a combustion chamber, 9, an exhaust channel, 10, a sample sending channel, 11, a perspective window, 12, quartz glass, 13, a motor, 14, a gear, 15, a push rod, 16, a connecting rod, 17, an air inlet channel, 18, a piston, 19-1, a first corundum tube, 19-2, a second corundum tube, 20, an electric spark igniter, 21, a fan, 22, a pressure sensor, 23, a heating resistance wire, 24, a temperature sensor, 25, a gas control valve, 26, an end cover, 27, a pressure air chamber, 28, a power equipment chamber, 29, a SiC fiber wire, 30, a thermocouple, 31 and fuel droplets.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
The experimental simulation device shown in fig. 1 comprises a base 1 and a combustion chamber 8, wherein the combustion chamber 8 is a hollow cylindrical cavity with two open ends. The shell is stainless steel and is filled with an alumina fiber heat insulation layer, is connected with the base through screws, and can be detached during failure. The left end of the combustion chamber is provided with an end cover 26, the end cover 26 is connected with the combustion chamber 8 through a plurality of screws, and the combustion chamber 8 can be sealed during experiments. Two perspective windows 11 for observing fire are arranged on the wall of the combustion chamber 8, and the window body is made by embedding high-temperature and high-pressure resistant quartz glass 12.
The outside of combustion chamber 8 has set up the position corresponding to perspective window 11 and has adopted high-speed camera as image acquisition module 5 and adopt LED strong light source as lighting device 6 to and install first support 2 and second support 3 on base 1, high-speed camera set up first support on 2, LED strong light source set up second support 3 on.
As shown in FIGS. 2 to 4, the upper wall surface of the interior of the combustion chamber 8 is provided with a first corundum tube 19-1 and a second corundum tube 19-2 which are arranged in parallel and respectively fix a SiC fiber wire 29 and a thermocouple 30. The SiC fiber filaments 29 serve to immobilize the fuel droplets 31, and the thermocouple 30 serves to record the gas phase temperature change of the droplets 31 during combustion. The fuel droplets 31 should be within the visible range of the see-through window 11. A sample feeding channel 10 and an exhaust channel 9 are formed in the wall of the combustion chamber 8, the sample feeding channel 10 is arranged near the corundum tube 19, the diameter is very small, and only the needle tip of a micro sampler can be inserted into the sample feeding channel, so that sample feeding is realized under the condition that the hearth door is sealed. The exhaust passage 9 and the sample feeding passage 10 are both provided with external thread structures and are provided with matched screw caps, and sealing can be realized through the screw caps according to requirements. The length extension direction of the sample sending channel 10 intersects with the tip position of the lower end of the SiC fiber wire 29, so that liquid drops can be conveniently hung on the tip of the SiC fiber wire 29.
In order to simulate different working conditions, different ignition modes are adopted, mainly including three ignition modes of electric spark, high-temperature spontaneous combustion and laser, and the following igniters are correspondingly and respectively arranged: the electric spark igniter 20 is arranged in the combustion chamber 8, the heating resistance wire 23 is arranged in the combustion chamber 8, and the laser igniter 7 is arranged outside the combustion chamber 8. At the same time, a pressurizing device is also provided for adjusting the air pressure inside the combustion chamber 8. The spark igniter 20 is arranged in the vicinity of the corundum tube and ensures that the spark generated ignites the fuel droplets. The combustion chamber 8 is also internally provided with a temperature sensor 24 which is matched with the heating resistance wire 23 and is used for accurately adjusting the ignition point of spontaneous combustion. The laser igniter 7 is arranged to ensure that the laser emitted from the laser igniter passes through the transparent window 11 and intersects with the lower end of the SiC fiber wire 29.
Wherein, the base 1 is also provided with a third bracket 4 for adjusting the height of the laser igniter 7. In the invention, the first support 2, the second support 3 and the third support 4 are all lifting supports with high stability. The height can be conveniently adjusted according to specific requirements. And this support and base structure as an organic whole do not have the risk that auxiliary assembly emptys.
Further, the control of the pressure in the combustion chamber 8 in the simulation mainly includes a plenum chamber 27 and a power plant chamber 28 provided in this order at the right-side open end.
The pressure chamber 27 includes a piston 18 for compressing gas and delivering the gas to the combustion chamber 8, and an intake passage 17 disposed before a starting point of the piston 18, when the piston is at the starting point, the external gas is in communication with the pressure chamber 27. If the experimental conditions do not require a gas atmosphere, the gas is directly exposed to the air, and if the experimental conditions do require a gas atmosphere, the gas inlet channel 17 is connected with the corresponding gas cylinder through a hose. The end surfaces of the combustion chamber 8 and the air compression chamber 27 are provided with gas control valves 25, the gas control valves 25 are one-way control valves and are composed of springs and metal gaskets, and the metal gaskets are attached to the wall surface when not subjected to external force. The metal gasket is compressed by the external compressed gas to deform the spring, so that the compressed gas enters the combustion chamber 8 through a gap formed by the metal gasket and the inner wall surface, and the spring cannot be stretched reversely, so that the gas in the combustion chamber 8 cannot overflow.
The power equipment chamber 28 comprises mechanical equipment for providing power for the piston 18, and comprises a motor 13, a gear 14, a push rod 15 and a connecting rod 16. The push rod 15 is provided with a tooth groove matched with the gear 14, after the equipment is started, under the action of the gear 14, the motor 13 rotates to drive the push rod 15 to move, so that the connecting rod 16 is pushed to move horizontally, and finally the piston 18 moves horizontally, and after the piston 18 moves to a dead point, the motor 13 rotates reversely, and the piston 18 returns to a starting point.
Meanwhile, a plurality of fans 21 are arranged in the combustion chamber 8 and can be used for simulating indoor turbulent environment, each fan 21 is independently controlled, and the number of the fans to be started and stopped and the running power of the fans can be set 21 according to requirements.
The invention is further explained in detail by taking a laser ignition combustion experiment of alcohol droplets in a 40% oxygen environment, an environment with initial temperature, turbulence and high pressure as an example, and specifically comprises the following steps:
And 2, opening a screw cap of the sample sending channel 10, inserting a needle point of the micro-sampler, hanging the liquid drop 31 at the head of the fiber yarn, taking out the micro-sampler, and screwing the screw cap to realize sealing. The starting motor 13 drives the pushing rod 15 to move, so that the connecting rod 16 is pushed to move horizontally, and finally the piston 18 moves horizontally. The prepared gas pushes the metal gasket of the gas control valve 25 to deform the spring so as to enter the combustion chamber 8 through a gap between the metal gasket and the inner wall surface. When the pressure sensor 22 detects that the pressure in the combustion chamber 8 reaches a set value, the motor 13 is reversed to return the piston 18 to the starting point. If the piston 18 reaches the dead point and the required pressure is still not reached, the motor 13 rotates reversely to make the piston 18 return to the starting point and stay for a while, and the air flow in the high-pressure air bottle flows into the air compression chamber 27 again for next compression.
And 3, setting the starting and stopping number and the operating power of the fan 21 according to the required turbulent environment, and realizing the turbulent environment in the combustion chamber. The laser igniter 7 is started to emit high-energy laser from the laser igniter 7 to ignite the liquid drops. The high speed camera 5 will capture the complete burning of the droplets and the thermocouple 30 will record the temperature change during the burning of the droplets 31.
And 4, opening the exhaust channel 9, and exhausting and decompressing.
Adopt the visual experimental apparatus of above-mentioned structure, can also further study the burning of liquid drop under electric spark ignition and high temperature spontaneous combustion ignition mode under the condition of not dismantling experimental device, the difference lies in: in step 3, the laser igniter is not started, the electric spark igniter 20 is started to ignite the fuel liquid drops 31, or the heating resistance wire 23 is continuously provided with a large current.
The visual experimental device with the structure also has rich expansion function, and the micro sampler is replaced by the fuel pump, so that the combustion process of a large amount of liquid drops can be researched. After the combustion experiment is finished, the exhaust passage 9 can be opened, the plastic hose is connected into the flue gas analyzer, the fan 21 is started to assist in exhausting, and flue gas generated by combustion can be analyzed.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a visual experiment analogue means of fuel droplet burning characteristic under research high pressure, includes the combustion chamber, its characterized in that: the combustion chamber is characterized in that a perspective window is arranged on the wall of the combustion chamber cavity, a fuel droplet sampling assembly is arranged in the combustion chamber, fuel droplets sampled by the sampling assembly are positioned in an area observed by the perspective window, an image acquisition module and an irradiation light source are also arranged at the position, corresponding to the perspective window, of the outer side of the combustion chamber, and the image acquisition module acquires images of droplet combustion through the perspective window;
the fuel droplet ignition device further comprises an ignition device unit acting on the fuel droplets, wherein the ignition device unit comprises a plurality of igniters igniting according to ignition modes of the fuel droplets.
2. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure of claim 1, wherein: the ignition device comprises an electric spark igniter arranged in the combustion chamber, and the electric spark igniter is close to the lower end of the SiC fiber wire.
3. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure of claim 1, wherein: the ignition device comprises a laser igniter, the laser igniter is arranged outside the combustion chamber, and laser emitted from the laser igniter passes through the transparent window to intersect with the lower end of the SiC fiber wire.
4. A visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure according to claim 2 or 3, characterized in that: the ignition device comprises a heating resistance wire arranged in the combustion chamber and a temperature sensor.
5. The visual experimental simulation device for researching the combustion characteristics of the fuel droplets under the high pressure as claimed in claim 4, wherein: the gas compression device is arranged at the tail end of the combustion chamber, the pressure sensor is arranged in the combustion chamber, and a gas control valve is arranged between the gas compression device and the combustion chamber.
6. A visual experimental simulation apparatus for studying the combustion characteristics of fuel droplets under high pressure according to claim 3, wherein: still include height control bracket component, height control bracket component include first support, second support and third support, first support with image acquisition module link to each other, the second support with irradiation light source link to each other, the third support with laser igniter link to each other, first support, second support and third support adopt lifting support.
7. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure of claim 1, wherein: the sampling assembly comprises a first corundum tube, a SiC fiber wire and a sample sending channel, wherein the first corundum tube and the SiC fiber wire are vertically arranged, the upper end of the first corundum tube is fixed in the combustion chamber, the lower end of the first corundum tube is connected with the SiC fiber wire, fuel liquid drops are hung at the lower end of the SiC fiber wire, one section of the sample sending channel penetrates through the wall of the combustion chamber, and the extending direction of the sample sending channel is intersected with the lower end of the SiC fiber wire.
8. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure as claimed in claim 7, wherein: the SiC fiber wire is characterized by further comprising a second corundum tube and a thermocouple, wherein the second corundum tube and the first corundum tube are arranged in parallel, the thermocouple is connected to the lower end of the second corundum tube, and the end portion of the thermocouple is nearly coplanar with the lower end of the SiC fiber wire.
9. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure of claim 1, wherein: the image acquisition module adopts a high-speed camera, and the image acquisition module is focused at the lower end of the SiC fiber wire.
10. The visual experimental simulation device for studying the combustion characteristics of fuel droplets under high pressure of claim 1, wherein: the combustion chamber is also internally provided with a plurality of fans.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010099101.4A CN111257498A (en) | 2020-02-18 | 2020-02-18 | Visual experiment simulation device for researching fuel droplet combustion characteristics under high pressure |
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| CN202010099101.4A CN111257498A (en) | 2020-02-18 | 2020-02-18 | Visual experiment simulation device for researching fuel droplet combustion characteristics under high pressure |
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| CN113640453A (en) * | 2021-08-19 | 2021-11-12 | 常州大学 | Combustion device and method suitable for testing properties of solid-liquid fuel |
| CN114878741A (en) * | 2022-06-14 | 2022-08-09 | 郑州信息科技职业学院 | Test device for researching fuel evaporation combustion characteristics in supercritical environment |
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