CN117634187A - Safety threshold evaluation method for harm of electromagnetic field coupling discharge to fuel oil - Google Patents
Safety threshold evaluation method for harm of electromagnetic field coupling discharge to fuel oil Download PDFInfo
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- CN117634187A CN117634187A CN202311605562.4A CN202311605562A CN117634187A CN 117634187 A CN117634187 A CN 117634187A CN 202311605562 A CN202311605562 A CN 202311605562A CN 117634187 A CN117634187 A CN 117634187A
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- 230000008878 coupling Effects 0.000 title claims abstract description 61
- 238000010168 coupling process Methods 0.000 title claims abstract description 61
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 61
- 230000005672 electromagnetic field Effects 0.000 title claims abstract description 20
- 230000006378 damage Effects 0.000 title claims abstract description 17
- 239000000295 fuel oil Substances 0.000 title claims abstract description 17
- 238000011156 evaluation Methods 0.000 title claims abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 71
- 238000012360 testing method Methods 0.000 claims abstract description 42
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 38
- 239000000945 filler Substances 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 238000004088 simulation Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 230000005684 electric field Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 21
- 230000015556 catabolic process Effects 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000013101 initial test Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000000446 fuel Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The invention discloses a safety threshold evaluation method for fuel oil harm by electromagnetic field coupling discharge, which comprises the following steps: step one, constructing a simulation model of the structures of the oil filling port and the oil filling gun; step two, fixing the gap width D and the intensity E of electromagnetic radiation signals 0 Selecting a direction in which the coupling field intensity is maximum; step three, determining the gap width which enables the coupling field intensity to be maximum; step four, carrying out radiation test on the simulation model of the oil filler and the oil gun structure, and recording the coupling field intensity corresponding to the test frequency; step five, equivalent the structure of the oil filler and the oil gun is a parallel plate capacitor discharge model, and the critical electric field intensity under the test frequency is calculated; and step six, acquiring safety thresholds of electromagnetic radiation intensities under different frequencies. According to the gap coupling model of the geometrical structure of the oil gun and the oil filler and the parallel plate capacitor model, the safety threshold of the external electromagnetic radiation intensity can be effectively determined.
Description
Technical Field
The invention relates to electromagnetic field coupling discharge, in particular to a safety threshold evaluation method for fuel oil harm caused by electromagnetic field coupling discharge.
Background
For the scene (such as a fuel filler and a fuel gun) with gap coupling in a fuel system, if strong electromagnetic radiation is received, the damage of ignition of volatile materials such as fuel oil and the like can be caused, so that great potential safety hazards are brought, and therefore, the radiation intensity of electromagnetic waves under specified conditions is subjected to safety threshold measurement and evaluation.
However, at the present stage, the safety threshold measurement method aiming at the damage of electromagnetic field coupling discharge to fuel oil is not perfect, and the influence factors in the practical application environment are many, the uncertainty is large, so that it is difficult to determine a more reasonable safety threshold.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a safety threshold evaluation method for the harm of electromagnetic field coupling discharge to fuel oil, which can determine a reasonable safety threshold of external electromagnetic radiation intensity according to a gap coupling model of a fuel gun and a fuel filler geometry structure and a parallel plate capacitor model discharge rule.
The aim of the invention is realized by the following technical scheme: a safety threshold evaluation method for the harm of electromagnetic field coupling discharge to fuel oil is characterized in that: the method comprises the following steps:
step one, constructing a simulation model of the structures of the oil filling port and the oil filling gun: setting the width of a gap between the oil filling port and the oil filling gun as D, wherein the medium in the gap is air;
step two, fixing the gap width D and the intensity E of electromagnetic radiation signals 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, carrying out radiation tests on simulation models of the oil filling port and the oil filling gun structure from different directions, testing the coupling field intensity at the gap, and then selecting the direction in which the coupling field intensity is maximum;
preferably, the radiation test on the simulation model of the structure of the oil filling port and the oil filling gun from different directions means that: carrying out a radiation test when the electromagnetic wave radiation signal direction and the plane of the slit are in different included angles;
the included angle has the following value range: starting from 0, the step-up is increased to 360 degrees in a set angular step (e.g., 5 degrees or 10 degrees), where 360 degrees is an integer multiple of the angular step; wherein each angle corresponds to a different direction.
Step three, fixing the intensity E of the electromagnetic radiation signal 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, under different gap widths D, carrying out radiation test on the simulation model of the oil filling port and the oil filling gun structure according to the direction of maximum coupling field intensity, testing the coupling field intensity at the gap, and selecting the gap width with the maximum coupling field intensity;
preferably, the initial test frequency can be randomly set to determine the direction and slot width that maximizes the coupling field strength, typically taking the set frequency minimum f min And a frequency maximum f max Arbitrary values in between.
The different gap widths D refer to: from a set minimum value D of the gap width min Initially, a minimum value D of the gap width is set min And the maximum value of the gap width D max The gap widths obtained by the steps are gradually increased according to the set step length DeltaD. For example, with a step size of 1mm, from 1mm to 14 mm;
step four, fixing the intensity E of the electromagnetic radiation signal 0 Selecting a direction with the maximum coupling field intensity as a radiation direction, selecting a gap width with the maximum coupling field intensity as a gap width between the oil filler and the oil gun, then carrying out a radiation test on a simulation model of the oil filler and the oil gun structure under test frequency, and recording the coupling field intensity corresponding to the test frequency;
step five, equivalent the structure of the oil filler and the oil gun to a parallel plate capacitor discharge model, and obtaining a breakdown voltage threshold V under the test frequency min Calculating the critical electric field intensity at the test frequency;
the discharging model of the parallel plate capacitor comprises two parallel medium plates, wherein a layer of metal electrode is respectively attached to the outer sides of the two medium plates and used for being connected with an external excitation power supply, gas at a gap between an oil filling port and an oil filling gun is filled between the medium plates, the medium plates are made of insulating materials, and the metal electrode is ideally a thin layer (no thickness is in an ideal state) and is attached to the outer sides of the insulating medium plates.
The fifth step comprises the following steps:
gold for parallel plate capacitor at test frequencyThe voltage with the frequency is injected into the electrode, the voltage value is gradually increased from the set initial voltage according to the predicted steps, the change curve of the terminal current along with the time is observed, whether the terminal current is suddenly increased is judged, when the difference value of the terminal currents at two adjacent moments exceeds the set threshold value, the breakdown phenomenon occurs, and the critical voltage value at the moment is the breakdown voltage threshold value V min The method comprises the steps of carrying out a first treatment on the surface of the The terminal current refers to the current between two metal electrodes; critical strength of electric field isWhere d is the distance between the dielectric slabs.
Breakdown threshold V when d varies min With a consequent change, but of critical strength of electric fieldAs such, D may take on values that are more convenient to simulate and calculate than being forced to be equal to the slot width D.
And step six, acquiring safety thresholds of electromagnetic radiation intensities under different frequencies.
The first step, calculate the electromagnetic radiation intensity safety threshold under the test frequency, record as:
wherein,characterizing a gap coupling by a factor of an increase in field strength; safety threshold E max For the maximum value of the actual external electromagnetic radiation, if the maximum value is exceeded, the field intensity of the coupling enhancement effect is larger than the breakdown field intensity threshold value which can be born by the system. Has potential safety hazard.
And secondly, when the test frequency takes different frequencies, respectively calculating the electromagnetic radiation intensity safety threshold value under each frequency.
The different frequencies refer to: from a set frequency minimum value f min Initially, at a set frequency minimum f min And a frequency maximum f max The frequencies obtained are gradually increased according to the set step Deltaf.
The safety threshold evaluation method further comprises the following steps:
and simultaneously changing gap media in a simulation model of the oil filler and the oil gun structure and inter-plate media (such as methane air mixing) of the parallel capacitors, and repeating the steps one to six to obtain safety thresholds of electromagnetic radiation intensity under different media (such as methane air mixing).
The beneficial effects of the invention are as follows: according to the gap coupling model of the geometrical structure of the oil gun and the oil filler and the discharging rule of the parallel plate capacitor model, the reasonable safety threshold of the external electromagnetic radiation intensity can be determined.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a simplified schematic diagram of a fuel filler;
FIG. 3 is a simplified model schematic of a fuel dispenser;
FIG. 4 is a block diagram of a media tablet system;
FIG. 5 is a schematic diagram of maximum coupling field strengths of different slit widths under irradiation of 1V/m (x direction) on the front side of the oil filler, wherein the field strength amplification effect is most remarkable when the slit width is 2 mm;
FIG. 6 is a schematic diagram of maximum coupling field strengths of different slit widths under irradiation of 1V/m (x direction) at the back of the oil filler, wherein the field strength amplification effect is most remarkable when the slit width is 2 mm;
FIG. 7 is a graph showing breakdown field strength as a function of frequency under default conditions;
FIG. 8 is a schematic illustration of a safety threshold curve of incident electromagnetic radiation perpendicular to the plane of the filler;
FIG. 9 is a graph showing the variation of methane mixed gas breakdown field strength with frequency;
fig. 10 is a schematic diagram of an electromagnetic field coupling discharge safety threshold under methane gas mixing conditions.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1, a method for evaluating a safety threshold of damage to fuel oil by electromagnetic field coupling discharge includes the following steps:
step one, constructing a simulation model of the structures of the oil filling port and the oil filling gun: setting the width of a gap between the oil filling port and the oil filling gun as D, wherein the medium in the gap is air;
step two, fixing the gap width D and the intensity E of electromagnetic radiation signals 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, carrying out radiation tests on simulation models of the oil filling port and the oil filling gun structure from different directions, testing the coupling field intensity at the gap, and then selecting the direction in which the coupling field intensity is maximum;
step three, fixing the intensity E of the electromagnetic radiation signal 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, under different gap widths D, carrying out radiation test on the simulation model of the oil filling port and the oil filling gun structure according to the direction of maximum coupling field intensity, testing the coupling field intensity at the gap, and selecting the gap width with the maximum coupling field intensity;
fixing the intensity of electromagnetic radiation signals, selecting the direction with the maximum coupling field intensity as the radiation direction, selecting the gap width with the maximum coupling field intensity as the gap width between the oil filler and the oil gun, then carrying out radiation test on the simulation model of the oil filler and the oil gun structure under the test frequency, and recording the coupling field intensity corresponding to each frequency;
the model of the oil filler and the oil gun with simplified structures is shown in fig. 2 and 3, and the coupling field intensity E is shown in fig. 5 and 6 under different test frequencies.
Step five, equivalent the structure of the oil filler and the oil gun to a parallel plate capacitor discharge model, and obtaining a breakdown voltage threshold V under the test frequency min Calculating the critical electric field intensity at the test frequency;
summarizing breakdown voltage threshold V under different conditions according to a parallel plate capacitor discharge model min . Wherein the parallel plate capacitor structure is as shown in the figure4, only select the center line between the plates to calculate, so that the edge effect can be ignored, the calculation area of the model is ensured to be in the uniform electric field, and meanwhile, the simplification from the three-dimensional structure to one-dimensional structure is realized, and the calculation amount can be greatly reduced. Taking the gap size 2d between two dielectric plates as 0.8mm, and the thickness t of the dielectric plates p Is 0.1mm, i.e. the distance between the two metal electrodes on the outside of the plate is 1mm. The default condition is that argon is filled between plates, the ambient temperature is 300K, the pressure is 1 atmosphere, the radius of parallel polar plates is 0.05m, and the approximate electron mobility is 10 25 (1/mVs) with an initial electron density of 10 6 (1/m 3 ) The initial average electron energy was 5eV, and the curve of the breakdown field strength with frequency was shown in fig. 7. When in time test, setting the gas between the plates to be consistent with the gas at the gap;
and step six, acquiring safety thresholds of electromagnetic radiation intensities under different frequencies.
The maximum value of the electric field radiation is calculated according to a maximum value calculation formula of actual external electromagnetic radiation, and the formula is as follows:
wherein E is max The field intensity of the coupling enhancement effect is larger than the breakdown field intensity threshold value which can be born by the system when the maximum value of the actual external electromagnetic radiation exceeds the maximum value, so that hidden danger is caused to the safety of the system.
And secondly, when the test frequency takes different frequencies, respectively calculating the electromagnetic radiation intensity safety threshold value under each frequency. The result of the calculated threshold is shown in fig. 8.
In the embodiments of the present application, taking an electromagnetic field coupling discharge pair as an example, a typical fuel system (methane air mixture) is evaluated by the following method:
summarizing the coupling field strengths corresponding to different external electromagnetic radiation intensities and gap widths according to the simplified simulation models of the oil filling port and the oil filling gun.
The methane gas breakdown field strength versus frequency curves are summarized according to a parallel plate capacitor discharge model, as shown in fig. 9.
According to the external electromagnetic radiation intensity E under the incident condition of the plane vertical to the oil filler 0 And the coupling field strength E, and the gap spacing 2d of the parallel plate capacitor gap discharge model and the breakdown voltage threshold V under corresponding conditions min And deducing a maximum value calculation formula of actual external electromagnetic radiation, and calculating an electromagnetic field coupling discharge safety threshold under the methane gas mixing condition, as shown in figure 10.
While the foregoing description illustrates and describes a preferred embodiment of the present invention, it is to be understood that the invention is not limited to the form disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the spirit of the invention described herein, either as a result of the foregoing teachings or as a result of the knowledge or skill of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (8)
1. A safety threshold evaluation method for the harm of electromagnetic field coupling discharge to fuel oil is characterized in that: the method comprises the following steps:
step one, constructing a simulation model of the structures of the oil filling port and the oil filling gun: setting the width of a gap between the oil filling port and the oil filling gun as D, wherein the medium in the gap is air;
step two, fixing the gap width D and the intensity E of electromagnetic radiation signals 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, carrying out radiation tests on simulation models of the oil filling port and the oil filling gun structure from different directions, testing the coupling field intensity at the gap, and then selecting the direction in which the coupling field intensity is maximum;
step three, fixing the intensity E of the electromagnetic radiation signal 0 When the frequency of the electromagnetic radiation signal is the initial test frequency, under different gap widths D, carrying out radiation test on the simulation model of the oil filling port and the oil filling gun structure according to the direction of maximum coupling field intensity, testing the coupling field intensity at the gap, and selecting the gap width with the maximum coupling field intensity;
step four, fixing the intensity E of the electromagnetic radiation signal 0 Selecting a direction with the maximum coupling field intensity as a radiation direction, selecting a gap width with the maximum coupling field intensity as a gap width between the oil filler and the oil gun, then carrying out a radiation test on a simulation model of the oil filler and the oil gun structure under test frequency, and recording the coupling field intensity corresponding to the test frequency;
step five, equivalent the structure of the oil filler and the oil gun to a parallel plate capacitor discharge model, and obtaining a breakdown voltage threshold V under the test frequency min Calculating the critical electric field intensity at the test frequency;
and step six, acquiring safety thresholds of electromagnetic radiation intensities under different frequencies.
2. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the radiation test of the simulation model of the oil filler and the oil gun structure from different directions is as follows: carrying out a radiation test when the electromagnetic wave radiation signal direction and the plane of the slit are in different included angles;
the included angle has the following value range: starting from 0, gradually increasing to 360 degrees according to a set angular step, wherein 360 degrees is an integer multiple of the angular step; wherein each angle corresponds to a different direction.
3. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the different gap widths D refer to: from a set minimum value D of the gap width min Initially, a minimum value D of the gap width is set min And the maximum value of the gap width D max The gap widths obtained by the steps are gradually increased according to the set step length DeltaD.
4. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the discharging model of the parallel plate capacitor comprises two parallel medium plates, wherein a layer of metal electrode is respectively attached to the outer sides of the two medium plates and used for being connected with an external excitation power supply, gas at a gap between an oil filling port and an oil filling gun is filled between the medium plates, the medium plates are made of insulating materials, and the metal electrode is attached to the outer sides of the insulating medium plates.
5. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the fifth step comprises the following steps:
under the test frequency, the voltage with the frequency is applied to the metal electrode of the parallel plate capacitor, the voltage value is gradually increased from the set initial voltage according to the prediction step, the change curve of the terminal current along with time is observed, whether the terminal current suddenly increases is judged, when the difference value of the terminal currents at two adjacent moments exceeds the set threshold value, the breakdown phenomenon occurs, and the critical voltage value at the moment is the breakdown voltage threshold value V min The method comprises the steps of carrying out a first treatment on the surface of the The terminal current refers to the current between two metal electrodes; critical strength of electric field isWhere d is the distance between the dielectric slabs.
6. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the sixth step comprises the following steps:
the first step, calculate the electromagnetic radiation intensity safety threshold under the test frequency, record as:
wherein,characterizing a gap coupling by a factor of an increase in field strength;
and secondly, when the test frequency takes different frequencies, respectively calculating the electromagnetic radiation intensity safety threshold value under each frequency.
7. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the different frequencies refer to: from a set frequency minimum value f min Initially, at a set frequency minimum f min And a frequency maximum f max The frequencies obtained are gradually increased according to the set step Deltaf.
8. The method for evaluating the safety threshold of the damage to the fuel oil by the electromagnetic field coupling discharge according to claim 1, wherein the method comprises the following steps: the safety threshold evaluation method further comprises the following steps:
and simultaneously changing gap media in a simulation model of the oil filling port and the oil filling gun structure and inter-plate media of the parallel capacitor, and repeating the first to sixth steps to obtain safety thresholds of electromagnetic radiation intensity under different media.
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