CN116297674B - System and method for simulating and calculating minimum ignition energy of combustible explosive working medium - Google Patents
System and method for simulating and calculating minimum ignition energy of combustible explosive working medium Download PDFInfo
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Abstract
The invention discloses a system for simulating and calculating the minimum ignition energy of a combustible explosive working medium, which comprises: the first pipeline and the second pipeline are respectively provided with a closed and heat-insulating experiment cabin; the dryer is positioned in the experimental cabin, and the reaction kettle is airtight and transparent; the device comprises a vacuum pump, an ignition energy adjustable igniter, a data acquisition and recording system, an air supply device and a working medium supply device which are positioned outside an experimental cabin; a pressure sensor for detecting the pressure of the second pipeline; the vacuum pump is communicated with the reaction kettle, and the second pipeline comprises two input ports and three output ports; the output port of the working medium supply device and the output port of the air supply device are respectively communicated with one of the input ports; the reaction kettle, the dryer and the pressure sensor are respectively communicated with one of the output ports; an ignition electrode connected with an ignition energy adjustable igniter is arranged in the reaction kettle; the data acquisition and recording system is used for acquiring related parameters of ignition energy and pressure change data in the reaction kettle in the ignition process, and storing and recording the data. The invention improves the precision and the safety of measuring the minimum ignition energy.
Description
Technical Field
The invention relates to a method for calculating minimum ignition energy of a refrigerant, in particular to a system and a method for calculating minimum ignition energy of a combustible explosive working medium in a simulation mode.
Background
At present, with modern climate change, the greenhouse effect is more and more serious. With the continuous advancement of modern refrigerant technology, the present invention has been updated to fourth generation refrigerants, however, active HFCs type refrigerants and HFOs type refrigerants are combustible and explosive refrigerants of A2 and above, and with the general application of R152a (A2) and other refrigerants, the combustibility of the refrigerant is emphasized.
Meanwhile, in the process of producing, transporting, applying and discarding the flammable refrigerant, the danger and the potential safety hazard of a considerable link exist, and particularly the possibility of explosion easily occurs after the refrigerant leaks. So that the study of the minimum ignition characteristics of its refrigerant has become an important point. The existing gas minimum ignition energy test device and experimental environment meeting the GB/T16428-1993 standard and the ISO 6184-2-1985 standard are less, the cost is high, the experimental cost is high, and the environmental risk is high due to high temperature and high pressure.
Disclosure of Invention
The invention provides a system and a method for simulating and calculating the minimum ignition energy of a combustible working medium in order to solve the technical problems in the prior art.
The invention adopts the technical proposal for solving the technical problems in the prior art that: a system for analog calculation of minimum ignition energy of a combustible explosive, comprising: the first pipeline, the second pipeline and the closed and heat-insulating experiment cabin; the dryer is positioned in the experimental cabin, and the reaction kettle is airtight and transparent; the device comprises a vacuum pump, an ignition energy adjustable igniter, a data acquisition and recording system, an air supply device and a working medium supply device which are positioned outside an experimental cabin; a pressure sensor for detecting the pressure of the second pipeline; the vacuum pump is communicated with the reaction kettle through a first pipeline; the second pipeline comprises two input ports and three output ports; the output port of the working medium supply device and the output port of the air supply device are respectively communicated with one input port of the second pipeline; the reaction kettle, the dryer and the pressure sensor are respectively communicated with one output port of the second pipeline; an ignition electrode connected with an ignition energy adjustable igniter is arranged in the reaction kettle; the data acquisition and recording system is used for acquiring relevant parameters of ignition energy and pressure change data in the reaction kettle in the ignition process, receiving signals from the pressure sensor and the ignition energy adjustable igniter, and storing and recording the signals.
Further, the experimental cabin is provided with a visual window.
Further, the device also comprises an image acquisition device for acquiring the images of the reaction kettle and a temperature sensor for acquiring the temperature in the experimental cabin; the data acquisition and recording system receives signals from the image acquisition device and the temperature sensor and synchronously acquires the temperature in the experimental cabin, the pressure in the reaction kettle and the image data of the reaction kettle at each time node.
The invention also provides a method for simulating and calculating the minimum ignition energy of the combustible explosive working medium, which utilizes the system for simulating and calculating the minimum ignition energy of the combustible explosive working medium to perform a working medium ignition experiment, and collects and records the data of the physicochemical parameters related to the working medium ignition in the working medium ignition experiment process; taking the experimental data as a reference, adopting Fluent software to establish a working medium model in a 2D experimental instrument and adopting Fluent software to carry out grid division; simulating the ignition of a working medium in an experimental instrument, recording the related physicochemical parameters of the ignition of the working medium in the simulation process, comparing the related physicochemical parameters of the ignition of the working medium obtained by the simulation of the ignition of the working medium with those obtained by a working medium ignition experiment, and optimizing a 2D model; and calculating the minimum ignition energy of the combustible explosion working medium by adopting an optimized model.
Further, the working medium and air are filled into the reaction kettle according to a set proportion, and an igniter is started to ignite a static gas mixture; the data acquisition and recording system acquires and records images of temperature, pressure and working medium ignition in the reaction kettle; which outputs a pressure-time curve, a temperature-time curve.
Further, the model is semi-sectioned based on symmetry of the experimental instrument, and only half sections are modeled.
Further, drawing a sketch to be modeled by adopting a Design model module of Fluent, and meshing the drawn sketch by using a Mesh module.
Further, in the case of a certain equivalence ratio, the minimum ignition energy interval is determined through experiments, and each input energy accuracy is 1E+9W/m 3 The energy interval is + -5E+9W/m 3 The corresponding minimum ignition energy under the equivalent ratio is obtained by the viewpoint of the firing condition; and (3) changing the heat flux density, and repeating the test on the lowest heat flux density with successful ignition, so as to ensure that the ignition of the energy can be successful for three times, thereby determining the lowest ignition energy under the equivalent ratio.
Further, simulation statistics are carried out on the minimum ignition energy tested under different concentrations, so that ignition energy change responses under different working medium concentrations are formed.
Further, the ignition energy at the ignition is calculated according to this formula:
Q＝q·π·V；
wherein:
q is the minimum ignition energy, unit mJ,
q is heat flux density, unit W/m 3 ；
Pi is ignition delay time, and is in units of mu s;
v is the ignition channel volume in mm 3 。
The invention has the advantages and positive effects that: when the minimum ignition energy is measured in a simulation way, the influence of experiments and simulation is considered, the safety and the predictability of the minimum ignition energy test experimental device are improved, the feasibility and the credibility of the simulation are enhanced to a certain extent, and the precision and the accuracy of the minimum ignition energy measurement are effectively improved.
Drawings
FIG. 1 is a schematic diagram of a system for simulating and calculating the minimum ignition energy of a combustible explosive working medium.
FIG. 2 is a flow chart of a method for simulating and calculating the minimum ignition energy of a combustible explosive working medium.
FIG. 3 adopts Fluent software to establish a working medium model and grid division in a 2D experimental instrument.
Fig. 4 is a temperature profile of R290 in the event of misfire.
Fig. 5 is a temperature distribution diagram of R290 in the case of successful ignition.
Fig. 6 is a statistical plot of R290 for minimum ignition energy at different concentrations.
In the figure: 1. a vacuum pump; 2. a first pipeline; 3. an experiment cabin; 4. a pressure sensor; 5. a second pipeline; 6. an electromagnetic valve; 7. a wire; 8. a reaction kettle; 9. an ignition electrode; 10. an ignition energy adjustable igniter; 11. a dryer; 12. a temperature sensor; 13. a data acquisition and recording system; 14. a visual window.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1 to 6, a system for simulating and calculating minimum ignition energy of a combustible explosive working medium includes: a first pipeline 2, a second pipeline 5 and a closed and heat-insulating experiment cabin 3; a dryer 11 and a closed and transparent reaction kettle 8 are positioned in the experiment cabin 3; the vacuum pump 1, the ignition energy adjustable igniter 10, the data acquisition and recording system 13, the air supply device and the working medium supply device are positioned outside the experimental cabin 3; a pressure sensor 4 for detecting the pressure of the second pipeline 5; the vacuum pump 1 is communicated with the reaction kettle 8 through a first pipeline 2; the second pipeline 5 comprises two input ports and three output ports; the output ports of the working medium supply device and the air supply device are respectively communicated with one input port of the second pipeline 5; the reaction kettle 8, the dryer 11 and the pressure sensor 4 are respectively communicated with one output port of the second pipeline 5; an ignition electrode 9 connected with an ignition energy adjustable igniter 10 is arranged in the reaction kettle 8; two input ports of the second pipeline 5 can be respectively provided as an input port A and an input port B; the three output ports of the second pipeline 5 are respectively an output port E, an output port F and an output port G; the output port of the working medium supply device can be communicated with the input port A; the output port of the air supply device can be communicated with the input port B; the output port E can be communicated with the reaction kettle 8; the output port F may be in communication with the dryer 11; the output port G may be in communication with the pressure sensor 4; an ignition electrode 9 is arranged in the reaction kettle 8, and the ignition electrode 9 is connected with an ignition energy adjustable igniter 10 through a lead 7; the data acquisition and recording system is used for acquiring ignition energy related parameters and pressure change data in the reaction kettle 8 in the ignition process, receiving signals from the pressure sensor 4 and the ignition energy adjustable igniter 10, and storing and recording the signals.
Preferably, the laboratory cabin 3 may be provided with a visual window 14. Changes in the reaction vessel 8 can be observed through the visual window 14.
Preferably, the device also comprises an image acquisition device for acquiring the image of the reaction kettle 8 and a temperature sensor for acquiring the temperature in the experiment cabin 3; the data acquisition and recording system receives 13 signals from the image acquisition device and the temperature sensor 12, and synchronously acquires the temperature in the experiment cabin 3, the pressure in the reaction kettle 8, the image data of the reaction kettle 8 and the like at each time node.
The image acquisition device may be a camera, and the data acquisition and recording system 13 may be a device or apparatus with a processor, a memory, a display, and other functional modules, such as a computer, a human-machine interface, and the like.
Preferably, the first pipeline 2, the input port a, the input port B and the output port E may be provided with solenoid valves 6. The first pipeline 2, the input port A, the input port B and the output port E are provided with electromagnetic valves 6, so that working media and air can be conveniently controlled to be filled into the reaction kettle 8 according to a set proportion.
The invention also provides a method for simulating and calculating the minimum ignition energy of the combustible explosive working medium, which utilizes the system for simulating and calculating the minimum ignition energy of the combustible explosive working medium to perform a working medium ignition experiment, and collects and records the data of the physicochemical parameters related to the working medium ignition in the working medium ignition experiment process; taking the experimental data as a reference, adopting Fluent software to establish a working medium model in a 2D experimental instrument and adopting Fluent software to carry out grid division; simulating the ignition of a working medium in an experimental instrument, recording the related physicochemical parameters of the ignition of the working medium in the simulation process, comparing the related physicochemical parameters of the ignition of the working medium obtained by the simulation of the ignition of the working medium with those obtained by a working medium ignition experiment, and optimizing a 2D model; and calculating the minimum ignition energy of the combustible explosion working medium by adopting an optimized model.
ANSYS Fluent software is internationally used CFD simulation software, in this case primarily for use and simulation of fluids, heat transfer and chemical reactions. It has a very rich mathematical model, numerical simulation method and post-processing capability, which are sufficient conditions to integrate ignition energy simulation and calculation. In the use of Fluent software, the complex airflow of compressible fluid is mainly used, so that the combustion process of a simulated working medium in a 2D reaction kettle model can be clearly simulated, and corresponding pressure and temperature change processes are given, so that the simulated working medium can be well compared with an experimental device part, and the reaction process after ignition in a container is fully displayed. The drawn symmetrical grid of the embodiment can be set by using a DM module and a Mesh module in Fluent, and preset conditions can be input into the grid according to actual experimental values, so that the experimental conditions are consistent with simulation.
Preferably, the working medium and air can be filled into the reaction kettle 8 according to a set proportion, and an igniter is started to ignite the static gas mixture; the data acquisition and recording system 13 can acquire and record images of the temperature, the pressure and the ignition of the working medium in the reaction kettle 8; which can output a pressure-time curve, a temperature-time curve.
Preferably, the model may be semi-sectioned based on symmetry of the experimental instrument, with only half sections being modeled.
Preferably, a Design model module of Fluent can be adopted to draw a sketch to be modeled, and a Mesh module can be adopted to grid the drawn sketch.
The Design Modeler module is special software for drawing grids and sketches in a Fluent Workbench sequence, DM for short, is a key part in the CFD simulation process and is also the first step in the simulation process. The DM can draw the real details and geometry of the desired model, and the continuous parameterized modeling environment he provides is ideal for design optimization. By profiling the reactor in this example, the module uses parametric geometry creation, conceptual modeling, CAD geometry correction, auto purge and repair, and some custom tools to map the flow and structure of the inlet, outlet, walls, and interior fields.
The Mesh module is a meshing tool in ANSYS Fluent and can be used to measure the 2D geometry in this example with high quality and accuracy. Through step decomposition of the Workbench workflow, the partial simulated smooth grid division can be directly imported into the CFD-Post for Post-processing without going out of a fluent environment. Furthermore, grids processed through finite elements may geometrically perform different grid types (structured, unstructured, polyhedral, boundary layer grids, etc.), thereby increasing the ability to process in parallel, generating grids at a faster rate. In this example, the geometric figure generated by DM is divided by Mesh module unstructured grid so as to solve.
Preferably, in the solving condition, the minimum ignition energy interval can be determined through experiments under the condition of a certain equivalence ratio, and each input energy accuracy can be 1E+9W/m 3 The energy interval can be + -5E+9W/m 3 The corresponding minimum ignition energy under the equivalent ratio can be obtained by viewing the ignition success condition; the heat flux density can be changed, repeated tests can be carried out on the lowest heat flux density with successful ignition, and the successful ignition of the energy can be ensured to be carried out three times, so that the lowest ignition energy under the equivalent ratio can be determined.
Preferably, simulated statistics can be performed on the minimum ignition energy tested at different concentrations to develop a varying response with respect to ignition energy at different working medium concentrations.
Preferably, the ignition energy at the ignition can be calculated according to this formula:
Q＝q·π·V；
wherein:
q is the minimum ignition energy, unit mJ,
q is heat flux density, unit W/m 3 ；
Pi is ignition delay time, and is in units of mu s;
v is the ignition channel volume in mm 3 。
The components, functional modules and devices of the experimental cabin 3, the temperature sensor 12, the dryer 11, the reaction kettle 8, the vacuum pump 1, the ignition energy adjustable igniter 10, the data acquisition and recording system 13, the pressure sensor 4, the image acquisition device, the air supply device, the working medium supply device and the like can be constructed by adopting components, functional modules and devices applicable to the prior art or adopting components, functional modules and devices in the prior art and adopting conventional technical means.
The structure, workflow and principle of operation of the present invention are further described in the following with a preferred embodiment of the present invention:
FIG. 2 is a flow chart of an embodiment of a method for simulating calculation of minimum ignition energy of a combustible explosive based on experiments and simulations. In this embodiment, taking the air conditioner working medium R290 as an example, the minimum ignition energy measurement process of the air conditioner working medium R290 in a standard measurement container is quantitatively analyzed. Specifically, the method for calculating the minimum ignition energy measurement based on experiments and simulation in the embodiment comprises the following steps:
1) Working media are selected according to specific application working conditions such as a refrigeration house, a refrigerator, an air conditioner and the like, and the specific experiment is carried out by taking a working medium R290 commonly used for the air conditioner as an object of experiment and simulation;
2) A system for simulating and calculating the minimum ignition energy of a combustible explosive working medium shown in figure 1 is built by referring to the standard GB/T16428-1993 and ISO 6184-2-1985, and experiments are carried out according to the following steps:
experimental conditions:
initial pressure: the pressure of the mixture is 0.1013MPa,
initial temperature: 300K of the total number of the components,
wall temperature: 300K of the total number of the components,
ignition time: the time required for the preparation is 0.01s,
concentration fraction of R290: 4.031%,
concentration fraction of oxygen in air: 0.20,
ignition energy: 1J of the total number of the components,
(1) preparing a mixture of R290 and air in a container according to a partial pressure method, wherein the filling concentration of R290 is 4.031% under the condition that the ratio of R290 is 1.0 equivalent according to the partial pressure fraction of the test substance being equal to the mole fraction, and the rest gases are filled with dry air according to the pressure distribution R290, namely 4.031% of the local atmospheric pressure;
(2) inputting ignition energy 1J into the static gas mixture, starting ignition, and simultaneously, recording the change trend of the pressure in the reaction kettle 8 and the image condition of R290 ignition by the data acquisition and recording system 13; and a pressure-time curve is prepared.
(3) The explosion pressure and the explosion pressure are calculated according to the pressure-time curve. As can be seen from fig. 6, taking the ignition energy of 1J as an example, the rising trend of the pressure change with time after ignition is very obvious under the condition that the ignition energy is higher than the minimum ignition energy, and the approximate range of the ignition energy of R290 and the basic flame propagation shape after the successful ignition of R290 are basically determined in the test, so that a certain basis is provided for the simulation analysis later;
(4) the experimental results were verified by at least two repeated experiments, respectively.
3) And establishing a working medium model in a 2D experimental instrument by referring to GB/T16428-1993 standard and ISO 6184-2-1985 standard, and carrying out grid division by adopting Fluent software, wherein the model can be subjected to half-section, namely, only half section is modeled, a Design model module of Fluent is adopted to draw a sketch to be modeled, and a Mesh module is adopted to carry out grid division on the drawing sketch, wherein the grid division details are shown in fig. 3, wherein a dividing line is symmetrically divided in a bottle at the right part, an air outlet is arranged at the upper left part, and an air inlet is arranged at the lower left part, so that air circulation in the testing process is ensured.
4) After grid division is completed, fluent software is imported for simulation, and the model boundary conditions are set as follows under the condition that the equivalent ratio is 1.0 at normal temperature and normal pressure:
initial pressure: the pressure of the mixture is 0.1013MPa,
initial temperature: 300K of the total number of the components,
wall temperature: 300K of the total number of the components,
constant spark diameter: the thickness of the film is 3mm,
ignition time: the time required for the preparation is 0.01s,
concentration fraction of R290: 4.031%,
concentration fraction of oxygen: 0.20,
the ignition energy at the ignition is calculated according to this formula:
Q＝q·π·V (1)
wherein Q is minimum ignition energy(mJ), q is the heat flux density (W/m) 3 ) Pi is ignition delay time (μs), V is ignition channel volume (mm) 3 ) In this case, the ignition delay time was proved to be optimally 50 μs by paper, V was the ignition channel volume, and 282.7mm in this example 3 At the set q heat flux density of 8.5E+10W/m 3 In the case of (converted to 1.202 mJ), an image of whether the container was on fire or not in 1s can be obtained from the simulation result, and if on fire, the situation shown in FIG. 5 would occur, and if not on fire, the situation shown in FIG. 4 would not have a change in temperature and pressure.
5) The ignition delay time and the ignition channel volume are kept unchanged, the input heat flux density is changed, and 8.5E+10W/m is input through preliminary experiments under the condition of 1.0 equivalent ratio 3 (1.202mJ)～9.5E+10W/m 3 (1.343 mJ) energy of 1E+9W/m 3 (0.014 mJ), the viewpoint firing behavior gives the corresponding minimum firing energy at this equivalence ratio, and the minimum firing energy as shown in FIG. 6 varies with the equivalence ratio by statistics of each firing energy input.
In this embodiment, R290 is taken as an example, and the minimum ignition energy of R290 at normal temperature and normal pressure is calculated in a simulation manner, however, those skilled in the art should know that the simulation and test method based on the minimum ignition energy of the present invention is also applicable to various combustible working media, and the minimum ignition energy of these combustible working media is significantly affected by other environmental factors, for example, whether the ignition of working media such as R152a and R32 is successful or not is also affected by factors such as ambient temperature and ambient initial pressure.
The above-described embodiments are only for illustrating the technical spirit and features of the present invention, and it is intended to enable those skilled in the art to understand the content of the present invention and to implement it accordingly, and the scope of the present invention is not limited to the embodiments, i.e. equivalent changes or modifications to the spirit of the present invention are still within the scope of the present invention.
Claims (8)
1. A system for analog calculation of minimum ignition energy of a combustible explosive, comprising: the first pipeline, the second pipeline and the closed and heat-insulating experiment cabin; the dryer is positioned in the experimental cabin, and the reaction kettle is airtight and transparent; the device comprises a vacuum pump, an ignition energy adjustable igniter, a data acquisition and recording system, an air supply device and a working medium supply device which are positioned outside an experimental cabin; a pressure sensor for detecting the pressure of the second pipeline; the vacuum pump is communicated with the reaction kettle through a first pipeline; the second pipeline comprises two input ports and three output ports; the output port of the working medium supply device and the output port of the air supply device are respectively communicated with one input port of the second pipeline; the reaction kettle, the dryer and the pressure sensor are respectively communicated with one output port of the second pipeline; an ignition electrode connected with an ignition energy adjustable igniter is arranged in the reaction kettle; the data acquisition and recording system is used for acquiring ignition energy related parameters and pressure change data in the reaction kettle in the ignition process, receiving signals from the pressure sensor and the ignition energy adjustable igniter, and storing and recording the signals;
the device also comprises an image acquisition device for acquiring the images of the reaction kettle and a temperature sensor for acquiring the temperature in the experimental cabin; the data acquisition and recording system receives signals from the image acquisition device and the temperature sensor and synchronously acquires the temperature in the experimental cabin, the pressure in the reaction kettle and the image data of the reaction kettle at each time node;
the method also comprises the step of establishing a working medium model in the 2D experimental instrument by adopting Fluent software; the model adopts Fluent software to carry out grid division, simulates the ignition of working media in an experimental instrument and records the physicochemical parameters related to the ignition of the working media in the simulation process; the method optimizes the physicochemical parameters related to the working medium ignition obtained by comparing and simulating the working medium ignition and the working medium ignition experiment; the method comprises the steps of performing simulation statistics on the minimum ignition energy tested under different concentrations to form ignition energy change responses under different working medium concentrations; the minimum ignition energy of the combustible explosive working medium at the ignition position is calculated according to the following formula:
Q＝q·π·V；
wherein:
q is the minimum ignition energy, unit mJ,
q is heat flux density, unit W/m 3 ；
Pi is ignition delay time, and is in units of mu s;
v is the ignition channelVolume in mm 3 。
2. The system for simulating and calculating the minimum ignition energy of a combustible explosive according to claim 1, wherein the experiment compartment is provided with a visual window.
3. The system for simulating and calculating the minimum ignition energy of the combustible working medium according to claim 1, wherein the data acquisition and recording system acquires and records images of the temperature, the pressure and the ignition of the working medium in the reaction kettle; which outputs a pressure-time curve, a temperature-time curve.
4. A method for simulating and calculating the minimum ignition energy of a combustible working medium, which comprises the steps of performing a working medium ignition experiment by using the system for simulating and calculating the minimum ignition energy of the combustible working medium according to any one of claims 1 to 3, and collecting and recording the data of physical and chemical parameters related to the working medium ignition in the working medium ignition experiment process; taking the physicochemical parameter data as a reference, adopting Fluent software to establish a working medium model in a 2D experimental instrument and adopting Fluent software to carry out grid division; simulating the ignition of a working medium in an experimental instrument, recording the related physicochemical parameters of the ignition of the working medium in the simulation process, comparing the related physicochemical parameters of the ignition of the working medium obtained by the simulation of the ignition of the working medium with those obtained by a working medium ignition experiment, and optimizing a 2D model; calculating the minimum ignition energy of the combustible explosion working medium by adopting an optimized model;
simulating and counting the minimum ignition energy tested under different concentrations to form ignition energy change responses under different working medium concentrations;
the ignition energy at the ignition is calculated according to this formula:
Q＝q·π·V；
wherein:
q is the minimum ignition energy, unit mJ,
q is heat flux density, unit W/m 3 ；
Pi is ignition delay time, and is in units of mu s;
v is the ignition channel volume in mm 3 。
5. The method for simulating calculation of minimum ignition energy of a combustible explosive working medium according to claim 4, wherein the working medium and air are filled into the reaction kettle according to a set proportion, and an igniter is started to ignite a static gas mixture; the data acquisition and recording system acquires and records images of temperature, pressure and working medium ignition in the reaction kettle; which outputs a pressure-time curve, a temperature-time curve.
6. The method for simulating and calculating the minimum ignition energy of a combustible explosive according to claim 4, wherein the model is semi-sectioned based on symmetry of an experimental instrument, and only the half section is modeled.
7. The method for simulating and calculating the minimum ignition energy of the combustible explosion working medium according to claim 4, wherein a Design model module of Fluent is adopted to draw a sketch to be modeled, and a Mesh module is adopted to grid the drawn sketch.
8. The method for simulating and calculating the minimum ignition energy of a combustible explosive working medium according to claim 4, wherein the minimum ignition energy interval determined through experiments under the condition of a certain equivalence ratio is as high as 1E+9W/m in each input energy precision 3 The energy interval is + -5E+9W/m 3 The corresponding minimum ignition energy under the equivalent ratio is obtained by the viewpoint of the firing condition; and (3) changing the heat flux density, and repeating the test on the lowest heat flux density with successful ignition, so as to ensure that the ignition of the energy can be successful for three times, thereby determining the lowest ignition energy under the equivalent ratio.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020004015A (en) * | 2000-06-27 | 2002-01-16 | 이동훈 | Measuring System for Minimum Ignition Energy of Flammable Powder |
| JP2010203987A (en) * | 2009-03-05 | 2010-09-16 | Sumitomo Chemical Co Ltd | Method of determining ignition delay time in measurement of minimum ignition energy of dust |
| JP2013152196A (en) * | 2012-01-26 | 2013-08-08 | Sumitomo Chemical Co Ltd | Apparatus for evaluating minimum ignition energy of powder |
| CN104181199A (en) * | 2014-08-05 | 2014-12-03 | 中国人民武装警察部队学院 | Ignition energy variable completely-transparent pipeline gas explosion experiment platform and method |
| CN104749217A (en) * | 2015-03-27 | 2015-07-01 | 中国石油大学(华东) | Ultralow temperature combustible gas explosion minimum ignition energy testing system and method |
| CN109668930A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test method of gas-particle two-phase combustible material minimum ignition energy |
| CN109668999A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test device of gas-particle two-phase combustible material minimum ignition energy |
| CN110514780A (en) * | 2019-08-27 | 2019-11-29 | 东北大学 | A kind of laser ignition measurement gas minimum ignition energy system and application method |
| CN112347690A (en) * | 2020-11-02 | 2021-02-09 | 西安科技大学 | Minimum ignition energy analysis method for combustible gas |
| CN112461890A (en) * | 2020-12-02 | 2021-03-09 | 广州特种机电设备检测研究院 | Minimum ignition can testing arrangement |
-
2022
- 2022-09-09 CN CN202211102563.2A patent/CN116297674B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020004015A (en) * | 2000-06-27 | 2002-01-16 | 이동훈 | Measuring System for Minimum Ignition Energy of Flammable Powder |
| JP2010203987A (en) * | 2009-03-05 | 2010-09-16 | Sumitomo Chemical Co Ltd | Method of determining ignition delay time in measurement of minimum ignition energy of dust |
| JP2013152196A (en) * | 2012-01-26 | 2013-08-08 | Sumitomo Chemical Co Ltd | Apparatus for evaluating minimum ignition energy of powder |
| CN104181199A (en) * | 2014-08-05 | 2014-12-03 | 中国人民武装警察部队学院 | Ignition energy variable completely-transparent pipeline gas explosion experiment platform and method |
| CN104749217A (en) * | 2015-03-27 | 2015-07-01 | 中国石油大学(华东) | Ultralow temperature combustible gas explosion minimum ignition energy testing system and method |
| CN109668930A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test method of gas-particle two-phase combustible material minimum ignition energy |
| CN109668999A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | The test device of gas-particle two-phase combustible material minimum ignition energy |
| CN110514780A (en) * | 2019-08-27 | 2019-11-29 | 东北大学 | A kind of laser ignition measurement gas minimum ignition energy system and application method |
| CN112347690A (en) * | 2020-11-02 | 2021-02-09 | 西安科技大学 | Minimum ignition energy analysis method for combustible gas |
| CN112461890A (en) * | 2020-12-02 | 2021-03-09 | 广州特种机电设备检测研究院 | Minimum ignition can testing arrangement |
Non-Patent Citations (3)
| Title |
|---|
| Al粉与高能炸药混合物的激光点火特性;郝海霞;姚二岗;赵凤起;徐司雨;高红旭;裴庆;;中国激光(第09期);全文 * |
| 气体爆炸最小点火能数学模型构建及参数耦合性研究;李大方;《CNKI硕士电子期刊》;第13页 * |
| 甲烷-空气最小点火能量预测理论模型;马秋菊;张奇;庞磊;;高压物理学报(第03期);全文 * |
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