CN115875136A - Sliding arc detection and adjustment method and system - Google Patents
Sliding arc detection and adjustment method and system Download PDFInfo
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- CN115875136A CN115875136A CN202310055627.6A CN202310055627A CN115875136A CN 115875136 A CN115875136 A CN 115875136A CN 202310055627 A CN202310055627 A CN 202310055627A CN 115875136 A CN115875136 A CN 115875136A
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Abstract
The invention provides a sliding arc detection and adjustment method and system, which relate to the field of spaceflight and are used for acquiring the current state of a sliding arc in an ignition region; judging whether the current state of the sliding arc meets a sufficient combustion condition or not by monitoring the current state of the sliding arc; when the current state of the sliding arc does not meet the sufficient combustion condition, adjusting the operation parameters of an actuating mechanism in the aerospace ignition device according to the difference degree of the current state and the sufficient combustion condition, so that the sliding arc is in dynamic change, self-adapts to the surrounding environment, has strong anti-interference capability until the current state meets the sufficient combustion condition, is in a stable operation state all the time, fully exerts the function of limited fuel and ensures the working durability of the aerospace engine; the aerospace ignition device is preferably a point-line ignition device, is simple in structure and suitable for ignition equipment in the aerospace field, and plasma has a process of gradual diffusion and re-aggregation, so that the utilization efficiency of the plasma is higher.
Description
Technical Field
The invention relates to the technical field of aerospace ignition, in particular to a sliding arc detection and adjustment method and system.
Background
The sliding arc discharge is a typical plasma generation mode, the sliding arc plasma is a warm plasma between a hot plasma and a cold plasma, the electric arc is driven by airflow to generate sliding, the sliding arc is continuously stretched and finally broken under the action of the airflow, and a new electric arc is generated at the shortest electrode distance to form periodic motion.
The sliding arc discharge plasma has a low electron temperature but a high electron number density and has typical non-equilibrium plasma characteristics. Researches show that a large amount of active particles, free radicals and the like released in the non-equilibrium plasma generation process promote the chemical reaction and improve the chemical reaction efficiency, thereby effectively improving the combustion efficiency and accelerating the combustion reaction. The ignition of the aerospace engine is the transition process of fuel flow from a non-reaction state to a strong exothermic reaction state, and is the most basic precondition for the operation of the engine.
Most space engines are internal combustion engines, so whether the propellant can be fully combusted in the combustion chamber directly affects the efficiency of the engine. The sliding arc type ignition is used as an ignition mode of an aerospace engine, the ignition mode is direct and efficient, the local combustion or insufficient combustion of a propellant is easily generated, and in addition, along with the disturbance of airflow in an ignition area and the change of an external environment, the stability of a sliding arc can be interfered to generate fluctuation, and the full combustion of fuel is not facilitated.
Disclosure of Invention
The invention aims to solve the problem of how to monitor and regulate the generation state of the sliding arc and ensure the stable and sufficient combustion of fuel.
To solve the above problem, in one aspect, the present invention provides a sliding arc detection and adjustment method, including:
acquiring the current state of a sliding arc in an ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density;
judging whether the current state of the sliding arc meets a sufficient combustion condition;
when the current state of the sliding arc does not meet the sufficient combustion condition, adjusting the operation parameters of an actuating mechanism in the aerospace ignition device according to the difference degree of the current state and the sufficient combustion condition;
and monitoring the current state until a sufficient combustion condition is met, and controlling the operation parameters of the actuating mechanism to stop changing, wherein the actuating mechanism comprises an excitation power supply and an air source.
Optionally, the obtaining the current state of the sliding arc in the ignition region includes:
acquiring temperature values at multiple points uploaded by temperature measuring equipment;
analyzing according to the temperature values at multiple points to obtain the average temperature and the highest temperature of the sliding arc coverage area;
acquiring a running image of the sliding arc in the ignition region;
analyzing to obtain an average brightness value of the sliding arc coverage area and a brightness value of the starting position of the sliding arc in the running image;
identifying the range of the area covered by the sliding arc in the running image to obtain the area of the sliding arc area;
optionally selecting a point in an area covered by the sliding arc, identifying the replacement times of the sliding arc in unit time, and recording the replacement times as the moving speed of the sliding arc;
identifying neighboring distances between the distributed moire curves in the running image;
and calculating to obtain an average distance according to the plurality of identified adjacent distances, and recording the average distance as the sliding arc density.
Optionally, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the highest temperature is greater than a first temperature threshold value;
when the highest temperature is larger than the first temperature threshold, judging whether the average temperature is larger than a second temperature threshold, wherein the first temperature threshold is larger than the second temperature threshold;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average temperature is greater than the second temperature threshold;
or judging whether the average temperature is smaller than a third temperature threshold value, wherein the third temperature threshold value is smaller than the second temperature threshold value;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average temperature is less than the third temperature threshold.
Optionally, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the brightness value of the initial position of the sliding arc is greater than a first brightness threshold value;
when the brightness value of the starting position of the sliding arc is larger than the first brightness threshold, judging whether the average brightness value is larger than a second brightness threshold, wherein the first brightness threshold is larger than the second brightness threshold;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average brightness value is greater than the second brightness threshold;
or judging whether the average brightness value is smaller than a third brightness threshold value, wherein the third brightness threshold value is smaller than the second brightness threshold value;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average brightness value is less than the third brightness threshold.
Optionally, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the area of the sliding arc region is in a preset area interval or judging whether the moving speed of the sliding arc is in a preset speed interval or judging whether the density of the sliding arc is in a preset density interval;
and when the area of the sliding arc region is not in the preset area interval, or the sliding arc moving speed is not in the preset speed interval, or the sliding arc density is not in the preset density interval, judging that the current state of the sliding arc does not meet the sufficient combustion condition.
Optionally, when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting an operating parameter of an actuator in the aerospace ignition device according to a difference between the current state and the sufficient combustion condition includes:
when the average temperature is higher than the second temperature threshold, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source until the average temperature is lower than the second temperature threshold;
or when the average temperature is lower than the third temperature threshold, increasing the parameters of the excitation power supply or/and increasing the air supply flow of the air source until the average temperature is higher than the third temperature threshold.
Optionally, when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting an operating parameter of an actuator in the aerospace ignition device according to a difference between the current state and the sufficient combustion condition includes:
when the average brightness value is larger than the second brightness threshold, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source until the average brightness value is smaller than the second brightness threshold;
or when the average brightness value is smaller than the third brightness threshold, increasing the parameters of the excitation power supply or/and increasing the air supply flow of the air source until the average brightness value is larger than the third brightness threshold.
Optionally, when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting an operating parameter of an actuator in the aerospace ignition device according to a difference between the current state and the sufficient combustion condition includes:
when the area of the sliding arc area is larger than the preset area interval, or the sliding arc moving speed is smaller than the preset speed interval, or the sliding arc density is smaller than the preset density interval, improving the parameters of the excitation power supply or/and increasing the gas supply flow of the gas source;
or when the area of the sliding arc area is smaller than the preset area interval, or the sliding arc moving speed is greater than the preset speed interval, or the sliding arc density is greater than the preset density interval, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source;
until the area of the sliding arc area is in the preset area interval, or the sliding arc moving speed is in the preset speed interval, or the sliding arc density is in the preset density interval.
Optionally, the aerospace ignition device comprises: the device comprises a line electrode, a point electrode, an insulating base, a gas flow control system, a gas source and a power supply system, wherein the power supply system comprises an excitation power supply and a power supply control system;
the wire electrode and the point electrode are installed on an insulating base, a gas channel is arranged on the insulating base, one end of a gas flow control system is connected with the output end of the gas source, a gas outlet at the other end of the gas flow control system is arranged at the gas channel and used for conveying gas from one side of the gas channel to the position between the wire electrode and the point electrode at the other side of the gas channel, one of the wire electrode and the point electrode is electrically connected with the positive electrode end of the power supply system, and the other one of the wire electrode and the point electrode is electrically connected with the grounding end of the power supply system.
In another aspect, the present invention further provides a sliding arc detection and adjustment system, including:
the state acquisition module is used for acquiring the current state of the sliding arc in the ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density;
the judging module is used for judging whether the current state of the sliding arc meets a sufficient combustion condition;
the adjusting module is used for adjusting the operating parameters of an actuating mechanism in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition when the current state of the sliding arc does not meet the sufficient combustion condition;
the judging module continuously monitors the current state until a sufficient combustion condition is met, and the adjusting module controls the operation parameters of the executing mechanism to stop changing.
Compared with the prior art, the invention has the following beneficial effects:
according to the sliding arc detection and adjustment method and system provided by the invention, the current state of the sliding arc is monitored, when the current state of the sliding arc does not meet the sufficient combustion condition, the operation parameters of an actuating mechanism in the aerospace ignition device are adjusted according to the difference degree of the current state and the sufficient combustion condition, so that the sliding arc is in dynamic change, self-adapts to the surrounding environment, has strong anti-interference capability, and is in a stable operation state until the current state meets the sufficient combustion condition, so that limited fuel can fully play a role, and the working durability of an aerospace engine is ensured.
Drawings
FIG. 1 illustrates a flow chart of a sliding arc detection adjustment method in an embodiment of the invention;
FIG. 2 shows an image of the operation of the sliding arc with a fixed supply frequency and a small supply air flow in an embodiment of the invention;
FIG. 3 shows an image of the operation of the sliding arc with a fixed power supply excitation frequency and a large supply air flow in an embodiment of the invention;
FIG. 4 shows an image of the operation of the sliding arc with a small supply gas flow fixed power supply excitation frequency in an embodiment of the invention;
FIG. 5 shows an image of the operation of the sliding arc with a fixed supply air flow and a higher supply excitation frequency in an embodiment of the invention;
FIG. 6 shows a schematic structural diagram of an aerospace ignition device in an embodiment of the invention;
FIG. 7 shows a schematic partial structure diagram of an aerospace ignition device in an embodiment of the invention.
Description of reference numerals:
1. a wire electrode; 2. a point electrode; 3. an insulating base; 4. a gas flow control system; 5. a gas source; 6. a power supply system; 7. a gas channel.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of the functions performed by the devices, modules or units.
It is noted that references to "a" or "an" or "the" modification(s) in the present invention are intended to be illustrative rather than limiting and that those skilled in the art will understand that reference to "one or more" unless the context clearly indicates otherwise.
Fig. 1 shows a flowchart of a sliding arc detection and adjustment method in an embodiment of the present invention, where the sliding arc detection and adjustment method includes:
s100: acquiring the current state of a sliding arc in an ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density; in addition to this, the emission intensity of the particular particle may also be included. As shown in fig. 2-4, the sliding arc assumes a different state in the ignition region as the parameters of the gas supply flow and the excitation power supply in the ignition device change.
S200: and judging whether the current state of the sliding arc meets a sufficient combustion condition. The sufficient combustion condition can be directly judging whether the parameter setting of the excitation power supply is reasonable or not and whether the air supply quantity of the air source is proper or not, monitoring and controlling the running state of the sliding arc from a source execution mechanism end, and monitoring the real-time running state after the sliding arc is generated, such as judging whether the movement of the sliding arc is stable or not, whether the distance between the sliding arcs is proper or not, judging whether the diffusion covered area of the sliding arc is too large or too small, and the like.
S300: and when the current state of the sliding arc does not meet the sufficient combustion condition, adjusting the operating parameters of an actuating mechanism in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition. The degree of difference described herein may be a value or a comparison result that measures whether the current state is below or above the full burn condition.
S400: and monitoring the current state until a sufficient combustion condition is met, and controlling the operation parameters of the actuating mechanism to stop changing, wherein the actuating mechanism comprises an excitation power supply and an air source. The operation parameters of the excitation power supply can select different voltage control system modulation parameters according to different power supply types, and the adjustable parameters comprise general parameters of the power supply, such as input voltage, input power, duty ratio and the like, and also comprise specific parameters of a specific power supply, such as power supply excitation frequency and the like of an alternating current power supply, key power supply parameters such as rising edge, pulse width and the like of a pulse power supply, and external resistance value and the like of a direct current power supply. Hereinafter, an ac power supply is used as an excitation power supply.
In this embodiment, by monitoring the current state of the sliding arc, when the current state of the sliding arc does not satisfy the sufficient combustion condition, the operating parameters of the actuator in the aerospace ignition device are adjusted according to the difference between the current state and the sufficient combustion condition, so that the sliding arc is in a dynamic change, is adaptive to the surrounding environment, has strong anti-interference capability, and is in a stable operating state until the current state satisfies the sufficient combustion condition, so that limited fuel can fully play a role, and the working durability of the aerospace engine is ensured.
The above method can be applied to different types of ignition devices, such as a double-blade or V-shaped linear ignition device, such as the monitoring operation images shown in fig. 3-5; the ignition device can also be a point-line type ignition device, as shown in figure 6; the method is used for monitoring the current running state of the sliding arc in real time and keeping the sliding arc in a stable state all the time.
Fig. 6 shows a schematic structural diagram of an aerospace ignition device in an embodiment of the invention, the aerospace ignition device is an electric wire type ignition device, and the aerospace ignition device comprises: the device comprises a line electrode 1, a point electrode 2, an insulating base 3, a gas flow control system 4, a gas source 5 and a power supply system 6;
the wire electrode 1 with point electrode 2 installs on insulating base 3, be provided with gas channel 7 on insulating base 3, the one end of gas flow control system 4 with the output of air supply 5 links to each other, and the gas outlet of the other end sets up gas channel 7 department is used for carrying gas from one side of gas channel 7 the gas channel 7 opposite side the wire electrode 1 with between the point electrode 2, one of them of wire electrode 1 with point electrode 2 with electrical connection of the positive terminal of electrical power generating system 6, another with electrical connection of the earthing terminal of electrical power generating system 6.
Specifically, the point electrode 2 and the line electrode 1 are made of conductive metal (stainless steel, copper, nickel, etc.), the point electrode 2 needs to be made of ablation-resistant metal, and the line electrode 1 is made of metal with good conductivity; the line electrode 1 is connected with a high-voltage end, the point electrode 2 is connected with a ground end, or the point electrode 2 is connected with the high-voltage end, and the line electrode 1 is connected with the ground end. The insulating base 3 can be made of various materials such as ceramics, zirconia, boron nitride and the like which meet the advantages of high temperature resistance, corrosion resistance, strong insulating property, easy processing and the like. The gas flow control system 4 is a system for controlling the flow of input gas, the pressure of a pipeline and the like, and can be a pressure reducing valve, a gas pipeline and a gas mass flowmeter (such as an electronic flowmeter, a rotor flowmeter and a float flowmeter) which only control the flow, and also can be an intelligent control system which can not only control the flow and can control the gas access time. The gas source 5 can be composed of one gas according to actual needs, the types of the gas include but are not limited to air, nitrogen, oxygen or argon and various gases capable of generating sliding arc plasma, further, in order to achieve the condition of discharge effect, the condition that two or more gas sources are mixed and introduced together can be set, and the condition can also be mixed gas with added fuel and oxidant; the power supply system 6 comprises an excitation power supply and a power supply control system, the excitation power supply comprises but is not limited to an alternating current power supply, a direct current power supply, a pulse power supply and other common power supplies capable of generating high voltage, and the self-made power supplies capable of generating sliding arc plasma according to requirements belong to the protection range. The power supply control system aims to modulate power supply output parameters to adjust the discharge effect of the sliding arc plasma, different voltage control system modulation parameters can be selected according to different power supply types, and the adjustable parameters comprise key power supply parameters such as input voltage, power supply excitation frequency, input power, duty ratio, rising edge, pulse width and the like. The channel distance of the gas channel 7 can be adjusted according to the gas type, the power type and the discharge requirement so as to achieve the best discharge effect, and the adjustment range of the channel distance is 1mm-10mm. When the gas is non-combustible gas, a discharge experiment can be carried out to study the key electrical phenomenon, if the gas is mixed gas of fuel and oxidant, the gas can be ignited to carry out ignition combustion supporting. Therefore, the device can be applied to aerospace ignition equipment, other equipment needing ignition, environmental governance, energy conversion, biomedicine and other fields.
Fig. 7 shows a schematic partial structure diagram of the aerospace ignition device in the embodiment of the invention, the wire electrode 1 may have its geometric dimensions changed according to actual needs, for example, the adjustable range of the included angle θ between the wire electrode 1 and the insulating base 3 is 0-90 °, the length L of the wire electrode 1 may be adjusted between 10mm-100mm, and the like. The discharge effect can be influenced by the size of the distance D between the two electrodes, and the discharge distance adjusting range is 1mm-10mm.
The point-shaped metal object and the linear metal wire are selected as two electrodes of the generating device, the two electrodes are positioned on the upper surface of the insulating base 3 and distributed on two sides of the gas channel 7, the wire electrode 1 is connected with the high-voltage end of the power supply system 6, and the point electrode 2 is connected with the grounding end. The power supply system 6 controls the power supply to be switched on and off and the output of power supply parameters. The gas flow is regulated by a gas flow control system 4, the gas is supplied by a gas source 5, and sliding arc discharge occurs under the combined action of gas jet and high voltage.
Under the action of the excitation voltage of the power supply system 6, the sprayed gas firstly discharges at the position where the distance between the root parts of the two electrodes is shortest to generate an initial arc, wherein the arc at one end of the point electrode 2 stays at one side of the point electrode 2, the arc at the other end of the point electrode 1 moves towards the opening direction of the electrode under the action of gas pushing to form a sliding arc, the sliding arc develops towards the far end along the wire electrode 1, and the arc length is gradually lengthened. Due to power limitation, when the length of the electric arc reaches a maximum value, the electric arc is extinguished, and due to the continuous action of the power supply system 6 and the gas source 5, a new electric arc can continuously occur at the root of the electrode, the motion track of the previous electric arc is repeated, and further a cycle is generated, which is a generation mode of the point-line type sliding arc plasma. The ignition device is simple in structure, is more inclined to a miniaturized structure, and is suitable for ignition equipment in the aerospace field, a sliding arc plasma area generated by a point-line structure is approximately triangular, the discharge effect is stable, in addition, the sliding arc plasma area is approximately triangular, the plasma has a gradual diffusion and re-aggregation process, the plasma utilization efficiency is higher, when the sliding arc plasma area is used as an igniter, the sliding arc plasma area is the same as the incoming flow direction of fuel, the fuel is also diffused and operated towards the far end under the pushing of gas, and the purposes of saving energy and completing the ignition requirement are achieved. In addition, key electrical parameters such as voltage, frequency and duty ratio are adjusted through the power supply system 6, and according to the actual discharge condition of the ignition device, the modulation system outputs instructions to external equipment such as a high-speed camera and a spectrometer through electric signals to acquire various instantaneous discharge data.
It should be noted that fig. 6 only shows one way of placing the ignition device, and the placing way is not limited to the vertical upward direction, and the air flow direction can be changed according to the requirement, and the horizontal placing, the vertical downward placing and the like can be performed to obtain different effects.
In one embodiment of the present invention, the obtaining the current state of the sliding arc in the ignition region includes:
obtaining temperature values at multiple points uploaded by temperature measuring equipment; the temperature measuring equipment can be infrared temperature measuring equipment or temperature sensing equipment, temperature values of a plurality of local positions in an area where the sliding arc is located are measured respectively, and temperature values of a plurality of points can be obtained.
And analyzing according to the temperature values at multiple points to obtain the average temperature and the highest temperature of the sliding arc coverage area. Comparing the temperature values of a plurality of points, and selecting the highest temperature; because if the sliding arc ignites the fuel mixture, a large amount of active particles and free radicals are released at the initial ignition position of the sliding arc, so that the internal motion of the fuel gas is enhanced, and then the internal motion of the fuel gas is gradually intensified when the fuel gas is gradually far away from the initial ignition position until the fuel gas is combusted. Therefore, the temperature at the initial starting position of the sliding arc is not too high, the maximum temperature is generally a certain distance away from the initial starting position, and therefore the running state of the sliding arc can be further indirectly monitored by monitoring the distance between the maximum temperature and the initial starting position of the sliding arc, so that the maximum temperature of the area where the sliding arc is located is kept at a proper distance from the initial position.
Acquiring a running image of the sliding arc in the ignition region;
and analyzing to obtain the average brightness value of the sliding arc coverage area and the brightness value of the starting position of the sliding arc in the running image.
And identifying the range of the area covered by the sliding arc in the running image to obtain the area of the sliding arc area. Because the coverage area of the sliding arc is gradually reduced and the brightness is gradually increased along with the increase of the air supply quantity of the air supply or the increase of the power supply excitation frequency, the state of the sliding arc can be further judged through the appearance phenomenon shown by the sliding arc.
Optionally selecting a point in an area covered by the sliding arc, identifying the replacement times of the sliding arc in unit time, and recording the replacement times as the moving speed of the sliding arc; wherein the gas supply flow affects the sliding arc movement speed.
Identifying neighboring distances between the distributed moire curves in the running image;
and calculating to obtain an average distance according to the plurality of identified adjacent distances, and recording the average distance as the sliding arc density. When the air supply flow of the air source is increased or the power supply excitation frequency is increased, the distance between the front sliding arc and the rear sliding arc is reduced, and in an extreme case, the adjacent sliding arcs are tightly attached to each other, and finally, most or all sliding arcs are mixed together, so that the sliding arcs are clustered together, and the local part is very bright, as shown in fig. 3 and 5.
In one embodiment of the present invention, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition includes:
judging whether the highest temperature is greater than a first temperature threshold value;
when the highest temperature is larger than the first temperature threshold, judging whether the average temperature is larger than a second temperature threshold, wherein the first temperature threshold is larger than the second temperature threshold;
determining that the current state of the sliding arc does not satisfy a full burn condition when the average temperature is greater than the second temperature threshold.
For example, when the maximum temperature is 120 ℃, and when the maximum temperature is 120 ℃ higher than the maximum temperature, the overall temperature is further judged according to the average temperature, and when the average temperature is 90 ℃ and exceeds the second temperature threshold of 85 ℃, the overall temperature is higher, that is, the gas supply flow may be too large, the combustion is sufficient and rapid, the heat cannot be dissipated in time, and the excess gas supply and the gas over-activation belong to.
Or judging whether the average temperature is smaller than a third temperature threshold value, wherein the third temperature threshold value is smaller than the second temperature threshold value;
determining that the current state of the sliding arc does not satisfy a full burn condition when the average temperature is less than the third temperature threshold.
For example, an average temperature of 70 c is less than 75 c, which is a third temperature threshold value, which indicates that the combustion quantity per unit time is insufficient, i.e. the gas supply quantity is insufficient or the influence of the sliding arc on the gas is insufficient.
In an embodiment of the present invention, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition includes:
judging whether the brightness value of the initial position of the sliding arc is greater than a first brightness threshold value;
when the brightness value of the starting position of the sliding arc is larger than the first brightness threshold value, judging whether the average brightness value is larger than a second brightness threshold value or not, wherein the first brightness threshold value is larger than the second brightness threshold value;
determining that the current state of the sliding arc does not satisfy a sufficient combustion condition when the average brightness value is greater than the second brightness threshold.
Because the increase and decrease of the brightness can be generated by the agglomeration phenomenon of the sliding arc, and in addition, the intensity of the sliding arc can also influence the brightness, the running state and the intensity degree of the sliding arc at the moment can be judged according to the brightness. Therefore, when the average brightness value is too large, the operation state of the whole sliding arc is relatively violent, and the tendency of agglomeration phenomenon exists, so that the operation state of the sliding arc is relatively violent and unstable, and the adjustment is needed in time to prevent the tendency.
Or judging whether the average brightness value is smaller than a third brightness threshold value, wherein the third brightness threshold value is smaller than the second brightness threshold value;
determining that the current state of the sliding arc does not satisfy a sufficient combustion condition when the average brightness value is less than the third brightness threshold. When the average brightness value is too small, it indicates that the sliding arcs are relatively dispersed and the distance between adjacent sliding arcs is relatively large, at this time, the influence of the sliding arcs on the gas is relatively weak, the ignition is unstable, and a problem of unsuccessful ignition may also occur, which is relatively harmful and needs to be avoided.
In an embodiment of the present invention, the determining whether the current state of the sliding arc satisfies a sufficient combustion condition includes:
and judging whether the area of the sliding arc region is in a preset area interval or judging whether the moving speed of the sliding arc is in a preset speed interval or judging whether the density of the sliding arc is in a preset density interval. The phenomena of the sliding arcs, such as the area of the sliding arc region, the moving speed of the sliding arc or the density of the sliding arc, are directly reflected, and whether the sliding arc runs properly or not and whether the sliding arc runs stably or not can be also explained. For example, when the area covered by the sliding arc is large, the sliding arc is dispersed, and the sliding arc is not easy to break, so that a longer distance can be achieved; when the moving speed is too high, the sliding arc is indicated to run violently; when the density of the sliding arc is higher, the updating speed of the sliding arc is high, namely the generating and displacement speed is high, and the sliding arc can be maintained for a period of time after the displacement is broken. Since, during the actual operation, the operating state of the sliding arc does not exhibit the extreme phenomena of fig. 3 or fig. 5, for example, but exhibits a state of fig. 2 or more concentrated than fig. 2, for example, under the detection and adjustment of the method, the situation that the sliding arc density cannot be identified when the sliding arc is concentrated can be temporarily disregarded.
And when the area of the sliding arc region is not in the preset area interval, or the sliding arc moving speed is not in the preset speed interval, or the sliding arc density is not in the preset density interval, judging that the current state of the sliding arc does not meet the sufficient combustion condition.
In an embodiment of the present invention, when the current state of the sliding arc does not satisfy the sufficient combustion condition, the adjusting the operation parameter of the actuator in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition includes:
when the average temperature is higher than the second temperature threshold, the overall temperature is higher, namely the gas supply flow is possibly overlarge, at the moment, the parameters of the excitation power supply are reduced or/and the gas supply flow of the gas source is reduced, and the influence of the sliding arc on the gas is weakened until the average temperature is lower than the second temperature threshold;
or when the average temperature is lower than the third temperature threshold, the combustion amount in unit time is insufficient, namely the gas supply amount is insufficient or the influence of the sliding arc on the gas is insufficient, at the moment, the parameters of the excitation power supply are increased or/and the gas supply flow of the gas source is increased, and the influence of the sliding arc on the gas is enhanced until the average temperature is higher than the third temperature threshold.
In an embodiment of the present invention, when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting the operation parameter of the actuator in the aerospace ignition device according to the difference between the current state and the sufficient combustion condition includes:
when the average brightness value is larger than the second brightness threshold, the operation state of the whole sliding arc is relatively violent, and the sliding arc tends to be agglomerated, the parameters of the excitation power supply are reduced or/and the air supply flow of the air source is reduced, the intensity of the sliding arc is weakened until the average brightness value is smaller than the second brightness threshold, and the sliding arc is ensured to be in a stable state;
or when the average brightness value is smaller than the third brightness threshold, the sliding arcs are dispersed, the distance between the adjacent sliding arcs is larger, the influence of the sliding arcs on the gas is weaker, at the moment, the parameters of the excitation power supply are increased or/and the gas supply flow of the gas source is increased until the average brightness value is larger than the third brightness threshold, the operation of the sliding arcs is guaranteed to be maintained at certain intensity, and the ignition stability is guaranteed.
In an embodiment of the present invention, when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting the operation parameter of the actuator in the aerospace ignition device according to the difference between the current state and the sufficient combustion condition includes:
when the area of the sliding arc area is larger than the preset area interval, or the sliding arc moving speed is smaller than the preset speed interval, or the sliding arc density is smaller than the preset density interval, the sliding arcs are dispersed, and the distance between the adjacent sliding arcs is larger, so that the parameters of the excitation power supply are improved or/and the air supply flow of the air source is increased;
or when the area of the sliding arc area is smaller than the preset area interval or the sliding arc moving speed is greater than the preset speed interval or the sliding arc density is greater than the preset density interval, the integral sliding arc is in a violent operation state and tends to have an agglomeration phenomenon, and the parameters of the excitation power supply are reduced or/and the air supply flow of the air source is reduced;
and when the area of the sliding arc area is in the preset area interval, or the sliding arc moving speed is in the preset speed interval, or the sliding arc density is in the preset density interval, the whole ignition device can be adaptive to the change of the surrounding environment, and the sliding arc is ensured to be always in a stable state.
There is also provided in an embodiment of the present invention a sliding arc detection adjustment system including:
the state acquisition module is used for acquiring the current state of the sliding arc in the ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density;
the judging module is used for judging whether the current state of the sliding arc meets a sufficient combustion condition or not;
the adjusting module is used for adjusting the operating parameters of an actuating mechanism in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition when the current state of the sliding arc does not meet the sufficient combustion condition;
the judging module continuously monitors the current state until a sufficient combustion condition is met, and the adjusting module controls the operation parameters of the executing mechanism to stop changing.
The sliding arc detection and adjustment system in the embodiment of the present invention is similar to the sliding arc detection and adjustment method in technical effect, and will not be described herein again.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A sliding arc detection adjustment method, comprising:
acquiring the current state of a sliding arc in an ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density;
judging whether the current state of the sliding arc meets a sufficient combustion condition;
when the current state of the sliding arc does not meet the sufficient combustion condition, adjusting the operation parameters of an actuating mechanism in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition;
and monitoring the current state until the sufficient combustion condition is met, and controlling the operation parameters of the actuating mechanism to stop changing, wherein the actuating mechanism comprises an excitation power supply and an air source.
2. The sliding arc detection adjustment method according to claim 1, wherein the acquiring the current state of the sliding arc in the ignition region comprises:
obtaining temperature values at multiple points uploaded by temperature measuring equipment;
analyzing according to the temperature values at multiple points to obtain the average temperature and the highest temperature of the sliding arc coverage area;
acquiring a running image of the sliding arc in the ignition region;
analyzing to obtain an average brightness value of the sliding arc coverage area and a brightness value of the starting position of the sliding arc in the running image;
identifying the range of the area covered by the sliding arc in the running image to obtain the area of the sliding arc area;
optionally selecting a point in an area covered by the sliding arc, identifying the replacement times of the sliding arc in unit time, and recording the replacement times as the moving speed of the sliding arc;
identifying neighboring distances between the distributed moire curves in the running image;
and calculating to obtain an average distance according to the plurality of identified adjacent distances, and recording the average distance as the sliding arc density.
3. The sliding arc detection and adjustment method according to claim 2, wherein the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the highest temperature is greater than a first temperature threshold value;
when the highest temperature is larger than the first temperature threshold, judging whether the average temperature is larger than a second temperature threshold, wherein the first temperature threshold is larger than the second temperature threshold;
determining that the current state of the sliding arc does not satisfy the full burn condition when the average temperature is greater than the second temperature threshold;
or judging whether the average temperature is smaller than a third temperature threshold value, wherein the third temperature threshold value is smaller than the second temperature threshold value;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average temperature is less than the third temperature threshold.
4. The sliding arc detection and adjustment method according to claim 2, wherein the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the brightness value of the initial position of the sliding arc is greater than a first brightness threshold value;
when the brightness value of the starting position of the sliding arc is larger than the first brightness threshold, judging whether the average brightness value is larger than a second brightness threshold, wherein the first brightness threshold is larger than the second brightness threshold;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average brightness value is greater than the second brightness threshold;
or judging whether the average brightness value is smaller than a third brightness threshold value, wherein the third brightness threshold value is smaller than the second brightness threshold value;
determining that the current state of the sliding arc does not satisfy the sufficient combustion condition when the average brightness value is less than the third brightness threshold.
5. The sliding arc detection and adjustment method according to claim 2, wherein the determining whether the current state of the sliding arc satisfies a sufficient combustion condition comprises:
judging whether the area of the sliding arc region is in a preset area interval or judging whether the moving speed of the sliding arc is in a preset speed interval or judging whether the density of the sliding arc is in a preset density interval;
and when the area of the sliding arc region is not in the preset area interval, or the sliding arc moving speed is not in the preset speed interval, or the sliding arc density is not in the preset density interval, judging that the current state of the sliding arc does not meet the sufficient combustion condition.
6. The sliding arc detection and adjustment method according to claim 3, wherein when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting an operating parameter of an actuator in an aerospace ignition device according to a difference degree between the current state and the sufficient combustion condition comprises:
when the average temperature is higher than the second temperature threshold, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source until the average temperature is lower than the second temperature threshold;
or when the average temperature is lower than the third temperature threshold, increasing the parameters of the excitation power supply or/and increasing the air supply flow of the air source until the average temperature is higher than the third temperature threshold.
7. The sliding arc detection and adjustment method according to claim 4, wherein when the current state of the sliding arc does not satisfy the sufficient combustion condition, adjusting the operating parameters of an actuator in the aerospace ignition device according to the degree of difference between the current state and the sufficient combustion condition comprises:
when the average brightness value is larger than the second brightness threshold, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source until the average brightness value is smaller than the second brightness threshold;
or when the average brightness value is smaller than the third brightness threshold, increasing the parameters of the excitation power supply or/and increasing the air supply flow of the air source until the average brightness value is larger than the third brightness threshold.
8. The sliding arc detection and adjustment method according to claim 5, wherein when the current state of the sliding arc does not satisfy the full burn condition, adjusting an operating parameter of an actuator in an aerospace ignition device according to a degree of difference between the current state and the full burn condition comprises:
when the area of the sliding arc area is larger than the preset area interval, or the sliding arc moving speed is smaller than the preset speed interval, or the sliding arc density is smaller than the preset density interval, improving the parameters of the excitation power supply or/and increasing the air supply flow of the air source;
or when the area of the sliding arc area is smaller than the preset area interval, or the sliding arc moving speed is greater than the preset speed interval, or the sliding arc density is greater than the preset density interval, reducing the parameters of the excitation power supply or/and reducing the air supply flow of the air source;
until the area of the sliding arc area is in the preset area interval, or the sliding arc moving speed is in the preset speed interval, or the sliding arc density is in the preset density interval.
9. The sliding arc detection and adjustment method according to any of claims 1-8, wherein the aerospace ignition device comprises: the device comprises a line electrode (1), a point electrode (2), an insulating base (3), a gas flow control system (4), a gas source (5) and a power supply system (6), wherein the power supply system (6) comprises an excitation power supply and a power supply control system;
the wire electrode (1) and the point electrode (2) are mounted on the insulating base (3), a gas channel (7) is arranged on the insulating base (3), one end of the gas flow control system (4) is connected with the output end of the gas source (5), and a gas outlet at the other end of the gas flow control system is arranged at the gas channel (7) and used for conveying gas from one side of the gas channel (7) to a position between the wire electrode (1) and the point electrode (2) at the other side of the gas channel (7); one of the line electrode (1) and the point electrode (2) is electrically connected with the positive terminal of the power supply system (6), and the other one is electrically connected with the grounding terminal of the power supply system (6).
10. A sliding arc detection and adjustment system, comprising:
the state acquisition module is used for acquiring the current state of the sliding arc in the ignition region; the current state comprises at least one of sliding arc brightness, sliding arc region temperature, sliding arc region area, sliding arc moving speed and sliding arc density;
the judging module is used for judging whether the current state of the sliding arc meets a sufficient combustion condition;
the adjusting module is used for adjusting the operating parameters of an actuating mechanism in the aerospace ignition device according to the difference degree between the current state and the sufficient combustion condition when the current state of the sliding arc does not meet the sufficient combustion condition;
the judging module continuously monitors the current state until a sufficient combustion condition is met, and the adjusting module controls the operation parameters of the executing mechanism to stop changing.
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| US20090236215A1 (en) * | 2006-05-26 | 2009-09-24 | Florida State University Research Foundation, Inc. | Gliding arc electrical discharge reactors with improved nozzle configuration |
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