CN113640337B - Experimental device and experimental method for researching evaporation and coking of hydrocarbon fuel droplets on micro-scale hot wall surface - Google Patents
Experimental device and experimental method for researching evaporation and coking of hydrocarbon fuel droplets on micro-scale hot wall surface Download PDFInfo
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- CN113640337B CN113640337B CN202110836743.2A CN202110836743A CN113640337B CN 113640337 B CN113640337 B CN 113640337B CN 202110836743 A CN202110836743 A CN 202110836743A CN 113640337 B CN113640337 B CN 113640337B
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- 238000001704 evaporation Methods 0.000 title claims abstract description 47
- 238000004939 coking Methods 0.000 title claims abstract description 46
- 239000000446 fuel Substances 0.000 title claims abstract description 44
- 230000008020 evaporation Effects 0.000 title claims abstract description 43
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 32
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 32
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 32
- 238000002474 experimental method Methods 0.000 title claims description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 78
- 230000005855 radiation Effects 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 28
- 238000012360 testing method Methods 0.000 claims description 14
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
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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
- G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis
Abstract
The invention provides an experimental device for evaporating and coking hydrocarbon fuel droplets on a micro-scale hot wall surface, which comprises an experimental cavity component, a heating system, a high-voltage electric system and an air supply system, wherein the experimental cavity component provides a closed environment and meets experimental and observation conditions of droplet evaporation, the heating system provides heating of the micro-wall surface and provides a stable radiation heat source for the experimental cavity environment, the high-voltage electric system provides experimental capability for evaporating and coking the droplets under the condition of high-voltage electric charge, and the air supply system simulates the functions of blowing out nozzle holes on the micro-wall surface and air supply and air exhaust for the experimental cavity. The invention solves the problem that no special and systematic experimental device for evaporating and coking hydrocarbon fuel droplets on the micro-scale hot wall surface exists at present, and has the advantages of multiple comprehensive experimental environments, multiple variable parameters, simple structure, easy realization, simple replacement of parts and the like, and simultaneously, the invention is easy to realize in process.
Description
Technical Field
The invention relates to an experimental device and an experimental method for researching evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface, and belongs to the technical field of energy and material chemistry of metal catalytic hydrocarbon fuels.
Background
Currently, the engine and the like using hydrocarbon as fuel are all used for converting chemical energy released by fuel combustion into mechanical energy for human use. In order to facilitate the carrying and storage, common domestic fuel is in a liquid state at normal temperature and pressure, and in order to improve the combustion efficiency, a nozzle is generally used to atomize the fuel so as to be in contact with the oxidizing agent as sufficiently as possible. In the combustion process, a high-temperature and high-pressure working environment is easy to generate, the harsh environment inevitably involves chemical reaction between a hot wall surface and fuel oil, and the hot wall surface or a nozzle and other parts are easy to generate coke bodies, so that the normal operation of an engine is endangered.
Under the working conditions of engine stop and the like, the waste heat on the wall surface of the combustion chamber still can transfer heat outwards in a heat radiation mode due to the extinction of flame of the combustion chamber. In this case, the fuel adheres to the metal wall in some form to cause evaporation, cracking or oxidation reactions, and the oxidized coke is a product of the chemical reaction, so that it is unavoidable, and the coked product significantly jeopardizes the performance and safety of the engine due to the accumulation of time.
The fuel oil is adhered to the metal wall surface mainly in two forms, the first is that the fuel oil atomized by the nozzle is adhered to the hot wall surface of the combustion chamber due to incomplete evaporation in the gas, and the second is that the nozzle orifice of the nozzle is usually small, so that the capillary force and the like are not negligible, and the fuel oil is adhered to the nozzle channel and the nozzle orifice. Both of these forms involve the evaporation of the fuel and chemical reaction between the wall material and the fuel.
In order to solve the problem of adhering fuel to a hot wall surface, for example, after an aeroengine is shut down, nitrogen is used for blowing off a nozzle; the coking reaction is inhibited by adopting a coating mode on the wall surface of the combustion chamber or the surface of the nozzle; techniques such as improving the atomization efficiency of the nozzle to avoid coking, and problems of coking on the wall surface of the combustion chamber and coking and blocking of the nozzle still exist, so that comprehensive researches on a system are still needed, and particularly researches on the evaporation of liquid drops on different forms of hot wall surfaces and the initiation and development processes of coking are needed.
The electric field has the characteristics of continuity, adjustability and easiness in control, and is low in cost, so that the electric field is an important choice for solving the coking problem. Due to the action of the electric field, the chemical reaction path in the coking process is changed, meanwhile, due to the action of the electric field, the charge distribution of the liquid drops on the wall surface is changed, and the evaporation characteristic of the liquid drops is changed by the increased charge force, so that the purpose of reducing coking is achieved. Therefore, the introduction of an electric field is an important means for improving or solving the coking.
Disclosure of Invention
The invention provides an experimental device and an experimental method for researching the evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface, which are used for solving the problem that a special and systematic experimental device for the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface does not exist at present.
The invention provides an experimental device for researching evaporation and coking of hydrocarbon fuel liquid drops on a micro-scale hot wall surface, which comprises an experimental cavity component, a heating system, a high-voltage electric system and an air supply system, wherein the experimental cavity component provides a closed environment and meets experimental observation conditions of liquid drop evaporation, the heating system provides heating of the micro-wall surface and a stable radiation heat source for the experimental cavity environment, the high-voltage electric system provides experimental capability for evaporation and coking of the liquid drops under the condition of high-voltage electric charge, and the air supply system simulates the functions of blowing out nozzle holes on the micro-wall surface and air supply and air exhaust of an experimental cavity.
Preferably, the experiment cavity assembly comprises an experiment cavity, an experiment cavity bottom cover, a hot wall table top and a hot wall table top support, wherein the experiment cavity is arranged on the experiment cavity bottom cover, and the hot wall table top is fixed in the experiment cavity.
Preferably, the experimental cavity body and the experimental cavity bottom cover are in threaded connection, and the connecting end face adopts a high-temperature end face sealing mode.
Preferably, the hot wall table top is fixed in the experimental cavity through hot wall table top struts at two sides, and the hot wall table top struts are connected in a threaded mode.
Preferably, the heating system comprises a table top heating plate and a cavity heating plate, wherein the table top heating plate is fixed on the bottom cover of the experiment cavity and is positioned right below the table top with a hot wall, and the cavity heating plate is fixed on the inner wall of the cavity of the experiment cavity.
Preferably, the high-voltage electric system is connected with a hot wall table board, the hot wall table board is insulated from the experimental cavity and the heating system, the high-voltage electric power supplies different voltage strengths and forms, and the bottom cover of the experimental cavity is connected with a grounding electrode.
Preferably, the air supply system comprises a vent tube connected to the bottom cover of the chamber, the vent tube being connectable to the hot wall table after removal of the table top heating plate.
Preferably, the hot wall table top is divided into two types, one is a round table surface with a threaded hole, and nozzles with different materials and different apertures can be installed in the threaded hole; the other is that one surface is a plane, and the other surface is a plane which is used for placing liquid drops according to the geometric dimension of the irregularly-shaped surface obtained by calculation according to different radiation powers of the table-board heating plate.
Preferably, a certain gap is reserved between the table top heating plate and the hot wall table top, and the hot wall table top is heated in a radiation heating mode.
Preferably, windows are formed on the top and the front and the back of the experimental cavity, the windows are sealed and attached by using high-temperature-resistant transparent materials, and then the windows are tightly sealed by using nuts and a compaction cover.
An experimental method for researching an experimental device for evaporating and coking hydrocarbon fuel droplets on a micro-scale hot wall surface specifically comprises the following steps:
1. according to different experimental requirements, different hot wall table tops are installed, for example, the reaction of droplet evaporation and stainless steel hot wall materials under the condition of no high voltage is studied, and a table top heating plate is connected to an experimental cavity bottom cover through a second high-temperature insulating bolt;
2. connecting a cavity heating plate to an experimental cavity through a first high-temperature insulating bolt, then installing a single-plane hot wall table top to the experimental cavity through a hot wall table top support, and screwing the hot wall table top support in the experimental cavity through a nut;
3. the quartz glass is arranged on the experimental cavity, and is tightly screwed, and meanwhile, the experimental cavity and the experimental cavity bottom cover are tightly screwed by bolts;
4. after the sensors such as pressure, temperature and the like are tested, checking tightness, introducing different gases according to requirements, such as anhydrous air, testing tightness, and hermetically maintaining the pressure for 24 hours under the experimental pressure which is more than 2 times, wherein the pressure change is not more than 1%;
5. the temperature control system is used for heating the inside of the cavity by radiation, so that the temperature in the cavity is stable, and the table top of the hot wall is heated by the table top heating plate, so that the temperature reaches a specified temperature and is stably maintained;
6. after the observation equipment is debugged, carrying out a droplet evaporation reaction experiment, quickly dripping droplets on a hot wall table surface through a fuel feeding system, testing the state change, and carrying out an in-line microscopic test on the focused wall surface after the droplets are evaporated and reacted completely;
7. if the experiment charges the liquid drop through high voltage, the step 5 is needed to debug the high voltage system and the corresponding test system, then the step 6 is carried out, and the current is needed to be electrified before the step 6 is carried out;
8. if the coking of the nozzle opening is researched, the plane table surface in the step 1 is required to be replaced by a table surface with the nozzle opening, the step is the same as 1-7, or liquid drops are firstly dripped in the step 5, then the subsequent step is carried out, if the coking of the nozzle opening with the blowing off is researched, the liquid drops are firstly dripped into the nozzle in the step 1, then the step 1-3 is carried out, the step 3 is required to be added with the blowing off step, and then the step 4-6 is carried out;
9. the experiment was performed with different table top materials and different hydrocarbon fuels as needed.
The experimental device for researching the evaporation and coking of hydrocarbon fuel liquid drops on the micro-scale hot wall surface and the experimental method thereof have the beneficial effects that:
1. the experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface provided by the invention has the advantages of multiple comprehensive experimental environments, multiple variable parameters and the like, and makes up for the lack of the experimental device for the multi-factor evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface by experimental simulation test of the evaporation of droplets on the hot wall surface and the catalytic chemical reaction process of fuel.
2. Specifically, the experimental device can provide experiments of different temperatures and pressures, different gas compositions, different materials and different types of fuel oil carrying out systems, can meet the online visual measurement modes of a microscopic zoom high-speed camera and the like for testing, and simultaneously simulate the working condition after blowing off and the evaporation of liquid drops and the catalytic chemical reaction process of fuel under the condition of increasing an electric field, so that experimental data are provided for basic research.
3. The invention has the advantages of simple structure, easy realization, simple replacement of parts and the like, and is easy to realize in process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In the drawings:
FIG. 1 is a schematic diagram of a three-dimensional structure of an experimental device for researching evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface;
FIG. 2 is a perspective schematic perspective view of an experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface;
FIG. 3 is a perspective view of a thermal tabletop heating plate for radiation heating;
FIG. 4 is a schematic diagram of a semi-sectional structure of an experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface;
FIG. 5 is a schematic view of the structure of a first hot wall mesa;
FIG. 6 is a schematic view of a structure of a hot wall mesa II;
the device comprises a 1-experiment cavity, a 2-cavity heating plate, a 3-first high-temperature insulating bolt, a 4-experiment cavity bottom cover, a 5-second high-temperature insulating bolt, a 6-table top heating plate, a 7-hot wall table top, an 8-hot wall table top support and a 9-vent pipe.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
the first embodiment is as follows: this embodiment will be described with reference to fig. 1 to 6. The experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface comprises an experimental cavity component, a heating system, a high-voltage electric system and an air supply system, wherein the experimental cavity component provides a closed environment and meets experimental observation conditions of droplet evaporation, for example, different pressures and gas types can be provided; the heating system provides heating of the micro wall surface and stable radiation heat source for the experiment cavity environment, and the heating system is precisely controlled through the temperature control system; the high-voltage electric system provides experimental capability for evaporation and coking of liquid drops under the condition of high-voltage electric charge, the voltage is controlled by the high-voltage electric system, and an oscilloscope is used for measuring; the air supply system simulates the functions of blowing out the nozzle holes on the tiny wall surface and supplying and exhausting air to the experimental cavity, the main structure is as shown in the perspective view of fig. 2, and a telescopic vent pipe 9 is arranged below the bottom cover 4 of the experimental cavity.
The experiment cavity assembly comprises an experiment cavity body 1, an experiment cavity bottom cover 4, a hot wall table top 7 and a hot wall table top support column 8, wherein the experiment cavity body 1 is arranged on the experiment cavity bottom cover 4, and the hot wall table top 7 is fixed in the experiment cavity body 1. The hot wall table top 7 is fixed in the experimental cavity 1 through hot wall table top support posts 8 at two sides, and the hot wall table top 7 and the hot wall table top support posts 8 are connected in a threaded mode.
The hot wall table top support posts 8 are made of high-temperature insulating materials, such as ceramic bolts, the hot wall table top support posts 8 are symmetrically arranged on two sides of the hot wall table top 7, the other ends of the hot wall table top support posts are in nut pressing sealing connection with the upper cover of the experiment cavity 1, and nuts are arranged outside the upper cover of the experiment cavity 1;
the experimental cavity body 1 and the experimental cavity bottom cover 4 are in threaded connection, and the connecting end face adopts a high-temperature end face sealing mode.
The heating system comprises a table top heating plate 6 and a cavity heating plate 2, wherein the table top heating plate 6 is fixed on the bottom cover 4 of the experimental cavity and is positioned right below the table top 7 of the hot wall, and the cavity heating plate 2 is fixed on the inner wall of the cavity 1 of the experimental cavity. The table top heating plate 6 is connected with the bottom cover 4 of the experimental cavity by adopting high-temperature insulating bolts 5, and the number of the high-temperature insulating bolts is more than or equal to 3 or a single insulating bolt is used in the middle position of the table top heating plate. The cavity heating plate 2 is arranged on the left side and the right side of the experiment cavity bottom cover 4 without a window, the number of the high-temperature insulating bolts adopted on each side is more than or equal to 3, or a single insulating bolt is used in the middle position of the table top heating plate.
The high-voltage power system is connected with the hot wall table top 7, the hot wall table top 7 is insulated from the experimental cavity body 1 and the heating system, the high-voltage power supplies different voltage strengths and forms, and the experimental cavity bottom cover 4 is connected with the grounding electrode.
The air supply system comprises a vent pipe 9, the telescopic vent pipe 9 is connected to the bottom cover 4 of the experiment cavity, and after the table top heating plate 6 is detached, the vent pipe 9 can be connected to the hot wall table top 7.
The hot wall table top 7 is divided into two types, one is a round table surface with a threaded hole, and nozzles with different materials and different apertures can be installed in the threaded hole; the other is that one surface is a plane, and the other surface is a plane which is used for placing liquid drops according to the geometric dimension of the irregularly-shaped surface obtained by calculation according to different radiation powers of the table-board heating plate 6.
A certain gap is reserved between the table top heating plate 6 and the hot wall table top 7, and the hot wall table top 7 is heated in a radiation heating mode.
The top and the front and the back of the experiment cavity 1 are provided with windows, the windows are sealed and attached by using high-temperature-resistant transparent materials, and then the windows are tightly pressed and sealed by using nuts and pressing covers.
The following is a specific explanation with reference to the accompanying drawings:
specifically, referring to fig. 4, an experimental apparatus for researching evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface is characterized in that: the whole square structure of three-side window is presented, the three-side window is mainly connected by bolts, the three-side window is mainly considered to be measured by adopting a microscopic zoom telling camera from the upper side, and the side is convenient for experimental observation or detection of other optical equipment. The experimental cavity assembly comprises an experimental cavity body 1, an experimental cavity bottom cover 4, a hot wall table top 7 and a hot wall table top support column 8, wherein the experimental cavity body 1 and the experimental cavity bottom cover 4 are in threaded connection, a connecting end face adopts a high-temperature end face sealing mode, and an end face sealing material adopts a high-temperature resistant material such as a graphite gasket. The hot wall table top 7 and the hot wall table top support column 8 are in threaded connection, and all sensor interfaces and liquid drop giving inlets can be connected through the upper cover of the experimental cavity 1.
The heating system comprises two parts, wherein a first part of table top heating plate 6 is connected with the bottom cover 4 of the experimental cavity by adopting a high-temperature insulating bolt 5, and the figure 3 can be clearly displayed; the second part cavity heating plate 2 is connected with the experimental cavity 1 by adopting a high-temperature insulating bolt 3.
The high-voltage power output terminal of the high-voltage power system is connected with the hot wall table top 7, the hot wall table top 7 is insulated from the whole experimental cavity assembly, and the high-voltage power supplies different voltage intensities and forms, so that the liquid drops are charged, and the bottom cover of the experimental cavity is connected with the grounding electrode.
The air supply system is connected to the bottom cover 4 of the experiment cavity through a telescopic vent pipe 9, after the table top heating plate 6 is detached, the vent pipe 9 can be connected to the hot wall table top 7, after connection, experiments such as nozzle blowing and the like can be completed, and when the experiment cavity is not connected, the experiment cavity is inflated and deflated, and the table top heating plate 6 is connected through bolts, so that the experiment cavity is convenient to detach.
The window is opened on the upper portion, front and back both sides to experiment cavity 1, uses high temperature resistant transparent material sealed laminating to look the window, for example uses quartz glass, and the structure as shown in fig. 1 can make high temperature transparent material embedded to in the experiment cavity, uses the sealed mode of terminal surface to seal, then uses nut and compresses tightly the lid and compresses tightly the seal, compresses tightly the lid and does not show in this case, can be according to the nimble adjustment of the size and the demand of window.
The hot wall table top support posts 8 are made of high-temperature insulating materials, such as ceramic bolts, the hot wall table top support posts 8 are symmetrically arranged on two sides of the hot wall table top 7, the other ends of the hot wall table top support posts are in nut pressing sealing connection with the experiment cavity 1, the sealing materials are also made of high-temperature resistant materials, the bolts penetrate through the wall surface of the experiment cavity 1, and the nuts are arranged outside the upper cover of the experiment cavity 1.
The table top heating plate 6 is connected with the bottom cover 4 of the experimental cavity by adopting high-temperature insulating bolts 5, the number of the high-temperature insulating bolts is more than or equal to 3 or single insulating bolts are used at the middle position of the table top heating plate, in the example, 4 insulating bolts are used, a certain gap is reserved between the table top heating plate 6 and the hot wall table top 7, and the hot table top 7 is heated by adopting a radiation heating mode.
The cavity heating plate 2 is arranged on the left side and the right side of the experimental cavity bottom cover 4 without a window, the number of the high-temperature insulating bolts 3 adopted on each side is more than or equal to 3 or a single insulating bolt is used in the middle position of the table top heating plate, 4 cavity heating plates are used in the embodiment, and the cavity heating plate can heat the whole cavity in a radiation mode.
As shown in fig. 5-6, the hot wall table top 7 is divided into two types, one type is a round table surface with a threaded hole, and nozzles with different materials and different apertures can be installed in the threaded hole, so that the hot wall table top is very convenient to detach and replace; the other side is a plane and the other side is a receiving surface for radiation heating according to different radiation powers of the table-board heating plate 6, and the geometric dimension of the surface with an irregular shape obtained by optimizing heat exchange calculation, for example, an arc shape is adopted in the example, so as to make the heat flow density of the surface uniform.
The experimental device for researching the evaporation and coking of hydrocarbon fuel liquid drops on the micro-scale hot wall surface comprises the following experimental methods:
1. according to different experimental requirements, different hot wall table tops 7 are installed, for example, the reaction of droplet evaporation and stainless steel hot wall materials under the condition of no high voltage is studied, and a table top heating plate 6 is firstly connected to an experimental cavity bottom cover 4 through a second high-temperature insulating bolt 5;
2. the cavity heating plate 2 is connected to the experimental cavity 1 through a first high-temperature insulating bolt 3, then a single-plane hot-wall table 7 is installed on the experimental cavity 1 through a hot-wall table support 8, and the hot-wall table support 8 is screwed in the experimental cavity 1 through nuts;
3. quartz glass is arranged on the experimental cavity 1 and is tightly screwed, and meanwhile, the experimental cavity 1 and the experimental cavity bottom cover 4 are tightly screwed by bolts;
4. after the sensors such as pressure, temperature and the like are tested, checking tightness, introducing different gases according to requirements, such as anhydrous air, testing tightness, and hermetically maintaining the pressure for 24 hours under the experimental pressure which is more than 2 times, wherein the pressure change is not more than 1%;
5. the cavity heating plate 2 is used for carrying out radiation heating on the inside of the cavity through the temperature control system, so that the temperature in the cavity is stable, and the hot wall table 7 is heated through the table heating plate 6, so that the temperature reaches a specified temperature and is stably maintained;
6. after the observation equipment is debugged, carrying out a droplet evaporation reaction experiment, quickly dripping droplets on a hot wall table surface through a fuel feeding system, testing the state change, and carrying out an in-line microscopic test on the focused wall surface after the droplets are evaporated and reacted completely;
7. if the experiment charges the liquid drop through high voltage, the step 5 is needed to debug the high voltage system and the corresponding test system, then the step 6 is carried out, and the current is needed to be electrified before the step 6 is carried out;
8. if the coking of the nozzle opening is studied, the planar table surface in the step 1 is required to be replaced by a table surface with the nozzle opening, the steps are the same as 1-7, and the step of needing to be added is that the liquid drops are required to be directly fed into the nozzle opening, or another experimental mode is adopted, the liquid drops are firstly added in the step 5 and then the subsequent steps are carried out, if the coking of the nozzle opening with the blowing is studied, the liquid drops are required to be added in the step 1 in advance, then the step 1-3 is carried out, the step 3 is required to be added with the blowing step, and then the step 4-6 is carried out;
9. the experiment was performed with different table top materials and different hydrocarbon fuels as needed.
The above specific embodiments are used for further detailed description of the objects, technical solutions and advantageous effects of the present invention. It should be understood that the foregoing description is only a specific example of the present invention, and is not intended to limit the invention, but rather is a reasonable combination of features described in the foregoing embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The experimental device for researching the evaporation and coking of hydrocarbon fuel liquid drops on the micro-scale hot wall surface is characterized by comprising an experimental cavity component, a heating system, a high-voltage electric system and an air supply system, wherein the experimental cavity component provides a closed environment and meets experimental observation conditions of liquid drop evaporation, the heating system provides heating of the micro-wall surface and a stable radiation heat source for the experimental cavity environment, the high-voltage electric system provides experimental capability for the evaporation and coking of the liquid drops under the condition of high-voltage electric charge, and the air supply system simulates the actions of blowing out nozzle holes of the micro-wall surface and air supply and air exhaust of the experimental cavity;
the heating system comprises a table top heating plate (6) and a cavity heating plate (2), wherein the table top heating plate (6) is fixed on the bottom cover (4) of the experimental cavity and is positioned right below the table top (7) of the hot wall, and the cavity heating plate (2) is fixed on the inner wall of the cavity (1) of the experimental cavity.
2. The experimental device for researching evaporation coking of hydrocarbon fuel droplets on a micro-scale hot wall surface according to claim 1, wherein the experimental cavity assembly comprises an experimental cavity (1), an experimental cavity bottom cover (4) and a hot wall table top (7), the experimental cavity (1) is installed on the experimental cavity bottom cover (4), and the hot wall table top (7) is fixed in the experimental cavity (1).
3. The experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface according to claim 2, wherein the experimental cavity (1) and the experimental cavity bottom cover (4) are in threaded connection, and the connecting end face adopts a high-temperature end face sealing mode.
4. The experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface according to claim 2, wherein the hot wall table top (7) is fixed in the experimental cavity (1) through hot wall table top struts (8) at two sides, and the hot wall table top (7) and the hot wall table top struts (8) are connected in a threaded mode.
5. The experimental device for researching evaporation and coking of hydrocarbon fuel droplets on a micro-scale hot wall surface according to claim 1, wherein a high-voltage power output terminal of the high-voltage power system is connected with a hot wall table top (7), the hot wall table top (7) is insulated from the experimental cavity (1) and the heating system, the high-voltage power provides different voltage intensity and forms, and the experimental cavity bottom cover (4) is connected with a grounding electrode.
6. The experimental device for studying hydrocarbon fuel droplets for evaporation and coking on micro-scale hot wall surfaces according to claim 1, characterized in that the gas supply system comprises a vent pipe (9), the telescopic vent pipe (9) is connected to the bottom cover (4) of the experimental chamber, and the vent pipe (9) can be connected to the hot wall table (7) after the table top heating plate (6) is detached.
7. The experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface according to claim 1, wherein a certain gap is reserved between the table top heating plate (6) and the hot wall table top (7), and the hot wall table top (7) is heated in a radiation heating mode.
8. The experimental device for researching the evaporation and coking of hydrocarbon fuel droplets on the micro-scale hot wall surface according to claim 1, wherein windows are formed on the top and the front and the back of the experimental cavity (1), the windows are sealed and attached by using a high-temperature-resistant transparent material, and then the windows are sealed by using bolts and a compression cover.
9. An experimental method of an experimental device for studying evaporative coking of hydrocarbon fuel droplets on a microscale hot wall surface according to any one of claims 1-8, comprising the steps of:
(1) According to different experimental requirements, different hot wall table tops (7) are installed, and a table top heating plate (6) is connected to an experimental cavity bottom cover (4) through a second high-temperature insulating bolt (5);
(2) Connecting a cavity heating plate (2) to the experimental cavity (1) through a first high-temperature insulating bolt (3), then installing a single-plane hot wall table top (7) to the experimental cavity (1) through a hot wall table top support (8), and screwing the hot wall table top support (8) in the experimental cavity (1) through a nut;
(3) The quartz glass is arranged on the experimental cavity (1) and is tightly screwed, and meanwhile, the experimental cavity (1) and the experimental cavity bottom cover (4) are tightly screwed by bolts;
(4) After the pressure and temperature sensors are tested, checking tightness, introducing different gases according to the requirement, testing tightness, and sealing and keeping the pressure for 24 hours under the experimental pressure which is more than 2 times, wherein the pressure change is not more than 1%;
(5) The cavity is heated by radiation through a temperature control system by using a cavity heating plate (2) so that the temperature in the cavity is stable, and a hot wall table (7) is heated through a table top heating plate (6) so that the temperature reaches a specified temperature and is stably maintained;
(6) After observation equipment is debugged, performing a droplet evaporation reaction experiment, rapidly dripping droplets on a hot wall table (7) through a fuel feeding system, testing state change, and performing an off-line microscopic test on the focused wall surface after droplet evaporation and reaction are completed;
(7) If the experiment charges the liquid drop through high voltage, the step 5 is needed to debug the high voltage system and the corresponding test system, then the step 6 is carried out, and the current is needed to be electrified before the step 6 is carried out;
(8) If the coking of the nozzle opening is researched, the plane table surface in the step 1 is required to be replaced by a table surface with the nozzle opening, the step is the same as 1-7, or liquid drops are firstly dripped in the step 5, then the subsequent step is carried out, if the coking of the nozzle opening with the blowing off is researched, the liquid drops are firstly dripped into the nozzle in the step 1, then the step 1-3 is carried out, the step 3 is required to be added with the blowing off step, and then the step 4-6 is carried out;
(9) And replacing materials of different table tops and different hydrocarbon fuels according to requirements for experiments.
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