CN113391022A - High-temperature high-pressure multi-atmosphere single-droplet combustion test device - Google Patents
High-temperature high-pressure multi-atmosphere single-droplet combustion test device Download PDFInfo
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Abstract
The invention discloses a high-temperature high-pressure multi-atmosphere single-droplet combustion test device, which comprises: the high-pressure cavity is provided with a liquid drop generating device, a liquid drop fixing device and a high-temperature ignition device in an inner cavity, the liquid drop generating device is positioned at the upper part of the high-pressure cavity, the liquid drop fixing device is positioned below the liquid drop generating device and used for bearing liquid drops, and the high-temperature ignition device is positioned at a liquid drop bearing part of the liquid drop fixing device and used for igniting the liquid drops; the liquid drop fixing device comprises four vertically arranged positioning upright columns, the four positioning upright columns enclose a rectangle, a horizontal suspension wire fixing plate is arranged at the upper end of each positioning upright column, and the heights of the suspension wire fixing plates are the same; two suspension wire fixing plates positioned on the same diagonal of the rectangle are connected with a tensioned silicon carbide suspension wire between the two suspension wire fixing plates, the two silicon carbide suspension wires are intersected at the center, and the intersection is used for bearing liquid drops. The test device is simple and convenient to operate, and can carry out a liquid drop ignition combustion test in a short time.
Description
Technical Field
The invention belongs to the technical field of combustion experiment devices, and particularly relates to a high-temperature high-pressure multi-atmosphere single-droplet combustion experiment device.
Background
High energy fuel technology is key to improving aircraft performance. In recent years, the development of hydrocarbon fuels is heading toward high density and high energy. The method is characterized in that high-energy nano particles are added into the traditional hydrocarbon fuel to form stable suspension to prepare the nano fluid fuel, and the method is an important means for improving the energy of the liquid fuel. In order to better understand the combustion mechanism of novel fuel droplets, provide basis for improving the combustion efficiency and energy characteristics of the fuel, develop a single-droplet ignition combustion experiment, and research the combustion characteristics of the nano fluid fuel and the influence law of each component.
The method has the characteristics of low cost, high feasibility, convenience in observation and the like by aiming at the research of the ignition combustion test of a single liquid drop, and is a basic research method widely adopted for researching the combustion characteristics of the fuel. The existing single-drop combustion test device is relatively complex in structure, relatively single in test environment and relatively complex in test operation. Therefore, it is highly desirable to improve the conventional single droplet burning test apparatus.
Disclosure of Invention
The invention aims to provide a high-temperature high-pressure multi-atmosphere single-droplet combustion test device which is simple and convenient to operate and can perform a droplet ignition combustion test in a short time.
The invention adopts the following technical scheme: a high-temperature high-pressure multi-atmosphere single-droplet combustion test device comprises: the high-pressure cavity is provided with a liquid drop generating device, a liquid drop fixing device and a high-temperature ignition device in an inner cavity, the liquid drop generating device is positioned at the upper part of the high-pressure cavity, the liquid drop fixing device is positioned below the liquid drop generating device and used for bearing liquid drops, and the high-temperature ignition device is positioned at a liquid drop bearing part of the liquid drop fixing device and used for igniting the liquid drops;
the liquid drop fixing device comprises four vertically arranged positioning upright columns, the four positioning upright columns enclose a rectangle, a horizontal suspension wire fixing plate is arranged at the upper end of each positioning upright column, and the heights of the suspension wire fixing plates are the same; a tensioned silicon carbide suspension wire is connected between two suspension wire fixing plates positioned on the same diagonal of the rectangle, the two silicon carbide suspension wires are intersected at the center, and the intersection is used for bearing liquid drops;
the liquid drop generating device comprises a rotating support plate, the near end of the rotating support plate is hinged to the top of the high-pressure cavity, a liquid drop generator is mounted on the rotating support plate, and the liquid drop outlet end of the liquid drop generator extends to the far end along the trend of the rotating support plate; the upper wall surface of the rotating support plate is connected with a first electric push rod, and the end part of the first electric push rod is connected with the top of the high-pressure cavity;
the electric push rod I is used for: pushing the far end of the rotating support plate to move downwards until the liquid drop outlet of the liquid drop generator is positioned above the intersection of the silicon carbide suspension wires; and the device is also used for pulling the distal end of the rotating support plate to move upwards until the rotating support plate is reset.
Further, both ends of each silicon carbide suspension wire are positioned at the upper part of the suspension wire fixing plate at the corresponding end and are pressed and fixed by a magnet block placed on the suspension wire fixing plate.
Furthermore, the high-temperature ignition device comprises a U-shaped heating plate, the opening side of the U-shaped heating plate faces the liquid drop fixing device, a heating wire is wound on the outer side of the U-shaped heating plate and attached to the side wall, and the end part of the heating wire is connected with an adjustable power supply;
the U-shaped heating plate is used for heating liquid drops, and when the liquid drops are heated, the U-shaped heating plate is located at the intersection of the silicon carbide suspension wires, and the liquid drops are located in a U-shaped space of the U-shaped heating plate.
Furthermore, an electromagnetic telescopic rod is connected to the side of the U-shaped heating plate, which is opposite to the opening side, and consists of a horizontal telescopic rod and a fixed table which are connected with each other, wherein the end part of the horizontal telescopic rod is connected with the side of the U-shaped heating plate, which is opposite to the opening side, the fixed table is arranged on a support, the support is a U-shaped frame with an upward opening and is arranged at the bottom in the high-pressure cavity;
the horizontal telescopic rod can move towards or away from the intersection of the silicon carbide suspension wires so as to drive the U-shaped heating plate to move.
Further, the liquid drop generator comprises a liquid transfer device and a capillary glass tube, wherein the gun head end of the liquid transfer device is connected with the capillary glass tube, the tail end of the liquid transfer device is connected with an electric push rod II, and the electric push rod II is used for driving the liquid transfer device to push fuel to drip out of the outlet end of the capillary glass tube.
Furthermore, one end of the high-pressure cavity is connected with an air supply device so as to realize the high-pressure state in the cavity; the other end is connected with a vacuum pump to realize the vacuum state in the cavity.
Furthermore, the electric push rod I, the electric push rod II, the adjustable power supply and the electromagnetic telescopic rod are all connected with a controller, and the controller is also connected with a control computer.
Further, the high-pressure gas device comprises a high-pressure oxygen cylinder, a high-pressure nitrogen cylinder and a high-pressure carbon dioxide cylinder which are used for storing gas, wherein each gas cylinder is respectively connected with the high-pressure cavity through a pipeline, each pipeline is provided with a flow regulator, and each flow regulator is connected with the controller.
The invention has the beneficial effects that: 1. the positions of the suspension wires are fixed through the four positioning upright columns, so that the intersection point positions of the suspension wires are unchanged, the liquid drops are positioned at the intersection points of the suspension wires, the positions are not interfered by other factors, and the liquid drops in each experiment can be ensured to be the same; meanwhile, the magnet block is used for clamping the suspension wire, the operation is simple and efficient, and the installation time is saved.
2. The liquid drop generator is arranged in the high-pressure cavity, liquid drops can be generated and hung on the filament by direct external control without opening the cavity during operation, the time is saved, the liquid drop generation mode is simple and reliable, a liquid drop ignition combustion test can be carried out in a short time, and the problems that liquid drop evaporation is reduced and the like caused by overlong standing time of the liquid drops before the test are solved.
3. The internal temperature of the U-shaped heating plate can be conveniently controlled by adjusting the adjustable power supply voltage. Meanwhile, the U-shaped heating plate only generates a local uniform high-temperature field which can completely comprise the whole liquid drop and cannot damage other equipment in the high-pressure cavity.
4. The flow and the proportion of the gas cylinders with various components are accurately controlled, various high-pressure atmosphere test environments can be formed in a free combination mode, and the evaporation and combustion characteristics of liquid drops in various high-pressure atmosphere environments can be researched.
Drawings
FIG. 1 is a schematic structural diagram of a high-temperature high-pressure multi-atmosphere single-droplet combustion test device;
FIG. 2 is a schematic diagram of the structure in the high-pressure chamber for generating suspended droplets;
FIG. 3 is a schematic structural diagram of a high-pressure cavity in ignition combustion of liquid droplets;
FIG. 4 is a schematic structural view of a droplet fixing device;
wherein: 1. the device comprises a high-pressure cavity, 2 parts of a high-pressure oxygen cylinder, 3 parts of a high-pressure nitrogen cylinder, 4 parts of a high-pressure carbon dioxide cylinder, 5 parts of a flow regulator, 6 parts of a liquid drop generator, 7 parts of an electric push rod I, 8 parts of a rotating support plate, 9 parts of a hinge, 10 parts of an electric push rod II and 11 parts of a control instrument, 12 parts of a control computer, 13 parts of a vacuum pump, 14 parts of an exhaust valve, 15 parts of an electromagnetic telescopic rod, 16 parts of a support, 17 parts of a U-shaped heating plate, 18 parts of an adjustable power supply, 19 parts of liquid drops, 20 parts of a magnet block, 21 parts of a suspension wire fixing plate, 22 parts of a silicon carbide suspension wire, 23 parts of a positioning upright column and 24 parts of a liquid transfer machine.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a high-temperature high-pressure multi-atmosphere single-droplet combustion test device which is suitable for hydrocarbon fuels and can also be nano fluid fuels with the nano particle content of less than 10 percent prepared on the basis of the hydrocarbon fuels. As shown in fig. 1, 2 and 3, the high-pressure chamber 1 is provided with a liquid drop generating device at the upper part inside, and the liquid drop generating device is used for generating liquid drops; and a liquid drop fixing device is arranged in the high-pressure cavity 1 and below the liquid drop generating device, and the liquid drop fixing device is used for bearing liquid drops. And a high-temperature ignition device is arranged in the high-pressure cavity 1 and at the liquid drop bearing position of the liquid drop fixing device, and the high-temperature ignition device is used for igniting the liquid drops.
The liquid drop fixing device comprises four vertically arranged positioning upright posts 23, the four positioning upright posts 23 enclose a rectangle, a horizontal suspension wire fixing plate 21 is arranged at the upper end of each positioning upright post 23, and the heights of the suspension wire fixing plates 21 are the same; as shown in fig. 4, a tensioned silicon carbide suspension wire 22 is connected between two suspension wire fixing plates 21 on the same diagonal of the rectangle, and the two silicon carbide suspension wires 22 intersect at the center, and the intersection is used for bearing liquid drops.
The liquid drop generating device comprises a rotating support plate 8, the near end of the rotating support plate 8 is hinged with the top of the high-pressure cavity 1, a liquid drop generator 6 is arranged on the lower wall surface of the rotating support plate 8, and the liquid drop outlet end of the liquid drop generator 6 extends to the far end along the trend of the rotating support plate 8; the upper wall surface of the rotating support plate 8 is connected with the first electric push rod 7, and the end part of the first electric push rod 7 is connected with the top of the high-pressure cavity 1.
The electric push rod I7 is used for: pushing the distal end of the rotating support plate 8 to move downwards until the liquid drop outlet of the liquid drop generator 6 is positioned above the intersection of the silicon carbide suspension wires 22; and also serves to pull the distal end of the rotating plate 8 upward until it is reset. Both ends of each silicon carbide suspension wire 22 are located on the upper wall surface of the suspension wire fixing plate 21 at the corresponding end and are pressed and fixed by the magnet block 20 placed thereon. The suspension wire fixing plates 21 are respectively fixed at the upper quarter positions of the four positioning upright columns 23. In use, after the silicon carbide suspension wires 22 are tensioned, the magnet block 20 presses both ends of the silicon carbide suspension wires 22, and the liquid drop 19 is placed at the intersection of the two silicon carbide suspension wires 22.
Above-mentioned high temperature ignition includes U type hot plate 17, and U type hot plate 17's opening side is towards liquid drop fixing device the outside on the U type hot plate 17, and paste and have the heater strip in the lateral wall winding, the tip of heater strip is connected with adjustable power 18. The U-shaped heating plate 17 is used for heating liquid drops, and when the liquid drops are heated, the U-shaped heating plate 17 is positioned at the intersection of the silicon carbide suspension wires 22, and the liquid drops are positioned in the U-shaped space of the U-shaped heating plate 17. The U-shaped heating plate 17 is used to heat the liquid droplets, and when the liquid droplets are heated, the U-shaped heating plate 17 is located at the intersection of the silicon carbide suspension filaments 22, and the liquid droplets are located in the "U" -shaped space of the U-shaped heating plate 17.
An electromagnetic telescopic rod 15 is connected to the side of the U-shaped heating plate 17, which is away from the opening, the electromagnetic telescopic rod 15 is composed of a horizontal telescopic rod and a fixed table which are connected, wherein the end part of the horizontal telescopic rod is connected with the side of the U-shaped heating plate 17, which is away from the opening, the fixed table is arranged on a support 16, and the support 16 is a U-shaped frame with an upward opening and is arranged at the bottom in the high-pressure cavity 1; the horizontal telescoping rod can move towards or away from the intersection of the silicon carbide suspension wires 22 to move the U-shaped heating plate 17.
In use, the internal temperature of the U-shaped heating plate 17 can be controlled by adjusting the voltage of the adjustable power supply 18. The adjustable power supply 18 and the electromagnetic telescopic rod 15 are controlled by the control instrument 11. During the test, firstly, the U-shaped heating plate 17 is electrified to be heated, and then the electromagnetic telescopic rod 15 is controlled to extend forwards until the liquid drops 19 enter the U-shaped heating plate 17.
The droplet generator 6 comprises a liquid shifter 24 and a capillary glass tube, wherein the gun head end of the liquid shifter 24 is connected with the capillary glass tube, the tail end of the liquid shifter 24 is connected with the electric push rod two 10, and the electric push rod two 10 is used for driving the liquid shifter 24 to push fuel to drip out from the outlet end of the capillary glass tube. The outer diameter of the capillary glass tube is selected to be about 0.3 mm. The electric push rod I7, the electric push rod II 10, the adjustable power supply 18 and the electromagnetic telescopic rod 15 are all connected with a controller 11, and the controller 11 is further connected with a control computer.
One end of the high-pressure cavity 1 is connected with an air supply device so as to realize the high-pressure state in the cavity; the other end is connected with a vacuum pump 13, and the vacuum pump 13 is connected with an outlet valve 14 arranged on the high-pressure cavity 1. The vacuum pump 13 is used for exhausting the inherent atmosphere in the cavity and eliminating impurity gases, so that the atmosphere is purer when the cavity is inflated. Glass windows are arranged on the front and back opposite surfaces of the high-pressure cavity 1, and the test process can be observed.
During the experiment, the gas in the high-pressure cavity 1 is pumped out by the vacuum pump 13, and then the gas is input into the high-pressure cavity 1 through the high-pressure oxygen cylinder 2, the high-pressure nitrogen cylinder 3 and the high-pressure carbon dioxide cylinder 4.
The high-pressure gas device comprises a high-pressure oxygen cylinder 2, a high-pressure nitrogen cylinder 3 and a high-pressure carbon dioxide cylinder 4 which are used for storing gas, each gas cylinder is respectively connected with the high-pressure cavity 1 through a pipeline, each pipeline is provided with a flow regulator 5, and each flow regulator 5 is connected with a controller 11. The control device 11 outputs control signals to control the three flow regulators 5, thereby regulating the flow of the three gases.
The use process of the high-temperature high-pressure multi-atmosphere single-droplet combustion test device is as follows:
first, a fuel to be measured is injected into the pipette 24 and is mounted on the rotating plate 8. Four magnet blocks 20 are taken, after the silicon carbide suspension wires 22 are alternately arranged and tensioned on the suspension wire fixing plate 21, the two ends of the two silicon carbide suspension wires 22 are tightly pressed by the four magnet blocks 20. Then, the high-pressure chamber 1 is tightly closed, the exhaust valve 14 is opened, the vacuum pump 13 is opened, the inside of the high-pressure chamber 1 is pumped to a state close to vacuum, and the exhaust valve 14 and the vacuum pump 13 are closed. The range of the pipette 24 is 2.5 microliters.
The gas to be introduced is selected to be one gas or the combination of a plurality of gases so as to observe the combustion state of the fuel to be researched under different gas pressures. The parameters of the control instrument 11 are set through the control computer 12, the flow of the flow regulator 5 is controlled, the specified gas is introduced into the high-pressure cavity 1 until the preset pressure is reached, the experimental pressure is within 10Mpa, and the gas cylinder is closed. And controlling the first electric push rod 7 to push the rotating support plate 8 until the tip of the liquid drop generator 6 is close to the intersection point of the two silicon carbide suspension wires 22, controlling the second electric push rod 10 to push the tail end of the liquid drop generator 6 until the liquid drop 19 is extruded from the tip of the liquid drop generator 6, finally suspending the liquid drop 19 at the intersection point of the silicon carbide suspension wires 22, and withdrawing the first electric push rod 7 and the second electric push rod 10. The voltage of the adjustable power supply 18 is controlled, the inside of the U-shaped heating plate 17 is heated to a specified temperature, and the electromagnetic telescopic rod 15 is controlled to extend out quickly until the liquid drops 19 enter the inside of the U-shaped heating plate 17. The droplets 19 are heated and ignited. After the burning of the droplets 19 is over, the electromagnetic telescopic rod 15 is retracted, and the adjustable power supply 18 and other electric equipment are turned off. And opening the exhaust valve 14 to discharge the gas in the high-pressure cavity 1 until the normal pressure is recovered, and ending the test.
Claims (8)
1. The utility model provides a many atmospheres of high temperature high pressure single drop combustion test device which characterized in that includes:
the high-pressure cavity (1), the cavity has liquid droplet generating device, liquid droplet fixing device and high-temperature ignition device, the said liquid droplet generating device locates at the upper portion of the high-pressure cavity (1), the said liquid droplet fixing device locates below the liquid droplet generating device and is used for bearing the liquid droplet, the said high-temperature ignition device locates at liquid droplet bearing position of the liquid droplet fixing device and is used for igniting the liquid droplet;
the liquid drop fixing device comprises four vertically arranged positioning upright posts (23), the four positioning upright posts (23) enclose a rectangle, a horizontal suspension wire fixing plate (21) is arranged at the upper end of each positioning upright post (23), and the heights of the suspension wire fixing plates (21) are the same; a tensioned silicon carbide suspension wire (22) is connected between the two suspension wire fixing plates (21) on the same diagonal of the rectangle, the two silicon carbide suspension wires (22) are intersected at the center, and the intersection is used for bearing liquid drops;
the liquid drop generating device comprises a rotating support plate (8), the near end of the rotating support plate (8) is hinged to the top of the high-pressure cavity (1), a liquid drop generator (6) is mounted on the rotating support plate (8), and the liquid drop outlet end of the liquid drop generator (6) extends to the far end along the trend of the rotating support plate (8); the upper wall surface of the rotating support plate (8) is connected with a first electric push rod (7), and the end part of the first electric push rod (7) is connected with the top of the high-pressure cavity (1);
the electric push rod I (7) is used for: pushing the distal end of the rotating support plate (8) to move downwards until the liquid drop outlet of the liquid drop generator (6) is positioned above the intersection of the silicon carbide suspension wires (22); and the device is also used for pulling the far end of the rotating support plate (8) to move upwards until reset.
2. A high-temperature high-pressure multi-atmosphere single-droplet burning test device according to claim 1, wherein both ends of each of the silicon carbide suspension wires (22) are located at the upper part of the suspension wire fixing plate (21) at the corresponding ends and are pressed and fixed by magnet blocks (20) placed thereon.
3. A high-temperature high-pressure multi-atmosphere single-droplet burning test device according to claim 1 or 2, wherein the high-temperature ignition device comprises a U-shaped heating plate (17), the opening side of the U-shaped heating plate (17) faces the droplet fixing device, a heating wire is wound on the outer side of the U-shaped heating plate (17) and attached to the side wall, and the end part of the heating wire is connected with an adjustable power supply (18);
the U-shaped heating plate (17) is used for heating liquid drops, when the liquid drops are heated, the U-shaped heating plate (17) is located at the intersection of the silicon carbide suspension wires (22), and the liquid drops are located in a U-shaped space of the U-shaped heating plate (17).
4. The high-temperature high-pressure multi-atmosphere single-droplet combustion test device according to claim 3, wherein an electromagnetic telescopic rod (15) is connected to the side of the U-shaped heating plate (17) away from the opening, the electromagnetic telescopic rod (15) is composed of a horizontal telescopic rod and a fixed table which are connected, wherein the end of the horizontal telescopic rod is connected to the side of the U-shaped heating plate (17) away from the opening, the fixed table is arranged on a support (16), and the support (16) is a U-shaped frame with an upward opening and is arranged at the bottom in the high-pressure cavity (1);
the horizontal telescopic rod can move towards or away from the intersection of the silicon carbide suspension wires (22) so as to drive the U-shaped heating plate (17) to move.
5. The high-temperature high-pressure multi-atmosphere single-droplet combustion test device according to claim 4, wherein the droplet generator (6) comprises a liquid transfer device (24) and a capillary glass tube, wherein a gun head end of the liquid transfer device (24) is connected with the capillary glass tube, a tail end of the liquid transfer device (24) is connected with a second electric push rod (10), and the second electric push rod (10) is used for driving the liquid transfer device (24) to push fuel to drip out from an outlet end of the capillary glass tube.
6. A high-temperature high-pressure multi-atmosphere single-droplet combustion test device as claimed in claim 5, wherein one end of the high-pressure cavity (1) is connected with a gas supply device to realize a high-pressure state in the cavity; the other end is connected with a vacuum pump (13) to realize the vacuum state in the cavity.
7. The high-temperature high-pressure multi-atmosphere single-droplet combustion test device as claimed in claim 6, wherein the electric push rod I (7), the electric push rod II (10), the adjustable power supply (18) and the electromagnetic telescopic rod (15) are all connected with a controller (11), and the controller (11) is further connected with a control computer.
8. A high-temperature high-pressure multi-atmosphere single-droplet combustion test device according to claim 7, wherein the high-pressure gas device comprises a high-pressure oxygen cylinder (2), a high-pressure nitrogen cylinder (3) and a high-pressure carbon dioxide cylinder (4) for storing gas, each cylinder is respectively connected with the high-pressure cavity (1) through a pipeline, a flow regulator (5) is arranged on each pipeline, and each flow regulator (5) is connected with the controller (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110679085.0A CN113391022A (en) | 2021-06-18 | 2021-06-18 | High-temperature high-pressure multi-atmosphere single-droplet combustion test device |
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| CN202110679085.0A CN113391022A (en) | 2021-06-18 | 2021-06-18 | High-temperature high-pressure multi-atmosphere single-droplet combustion test device |
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