CN110110443A - It is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water - Google Patents
It is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water Download PDFInfo
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- CN110110443A CN110110443A CN201910383187.0A CN201910383187A CN110110443A CN 110110443 A CN110110443 A CN 110110443A CN 201910383187 A CN201910383187 A CN 201910383187A CN 110110443 A CN110110443 A CN 110110443A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
It is the present invention relates to cable fire simulation analysis field, in particular to a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water.This method establishes the combustion chamber model met the requirements according to GB/T12666.2-2008 in fire dynamics simulation softward, setting cable system model parameter, carries out burning emulation, obtains temperature, heat release rate in combustion process and change over time data, judges whether cable meets national standard according to sensor the data obtained.The present invention solves the problems such as entity cable horizontal burning test is at high cost, risk is high, the period is long, flexibility is poor, pollution environment, it is short with modeling period, the advantages that flexible setting for parameters, work efficiency is high, can quickly examine unit cable horizontal firing characteristic.
Description
Technical field
The present invention relates to cable fire simulation analysis fields, more particularly to one kind for quickly examining single cable water flat
The emulation mode of combustion characteristics.
Background technique
Today's society rapid development, cable is in various industries using more and more extensive.But the application of cable is to social band
To also result in many fire safety evaluating hidden danger while great interests, once occur fire, not only increase the intensity of a fire and
And the intensity of a fire is quickly spread readily along the direction of lay of cable, further, since cable material is mostly polymer, is generated after burned
A large amount of flue gas, wherein most are the toxic gas and corrosive gas being harmful to the human body, and are not only caused to personnel in the scene of a fire
It greatly threatens, can also interfere the rescue work of fire fighter.
When producing wire and cable, sample produced is subjected to combustion testing according to standard, i.e., is led to cable under test
Flame combustion is crossed, the data such as the charing distance of cable are recorded, and analyze data, to obtain flame retardant property.With GB/
For T12666.2-2008, carry out needing to build closed combustion chamber, calibration every two weeks when wire and cable horizontal burning test once
Flame, reach for removed rapidly after the fiery time Ignition sources do not cause surrounding air fluctuation, record charing distance etc. complex steps.
In view of the above problems, the invention proposes a kind of for quickly examining the emulation side of the flat combustion characteristics of single cable water
Method can simulate a variety of cable models by l-G simulation test, and the modeling time of l-G simulation test is short, may be implemented quickly to examine
It tests, thus the risk and error saving equipment cost, reduce manual operation.
Summary of the invention
It is an object of the present invention to propose it is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water,
A kind of simulating experimental is provided, for realizing the quick inspection of single horizontal combustion characteristics, solution full-scale test is at high cost, endangers
The problems such as dangerous high, the period is long, flexibility is poor.
It is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water, include the following steps:
(1) fire dynamics simulation softward is selected, the combustion chamber mould met the requirements is established according to GB/T 12666.2-2008
Type；
(2) it determines tested wire cable model, obtains cable data, including construction of cable dimensional parameters, insulating materials category
Property, sheath material attribute；Determine test original ambient temperature；According to standard setting Ignition sources for fire and time of ceasing fire；By institute
Have in parameter input cable system model；
(3) several temperature, heat release rate sensor are set in cable system model；Carry out burning emulation；
(4) temperature, heat release rate in combustion process are obtained and changes over time data；Using being arranged in cable model system
Temperature, heat release rate sensor read combustion process in temperature, heat release rate change over time process.
The fire dynamics simulation softward is a kind of model of Fluid Mechanics Computation, it by the conservation of mass, the conservation of momentum,
The laws of nature such as the conservation of energy and the law of chemical reaction are applied in fire calculating, can be imitated with true reappearance scene of a fire situation
True data has high reliability and accuracy.
The cable system model parameter includes construction of cable parameter, insulating materials attribute, sheath material attribute；Cable knot
Structure parameter includes jacket thickness, insulation thickness, band thickness etc.；Insulating materials attribute and sheath material attribute include the body of material
Four density, specific heat capacity, thermal conductivity, combustion heat parameters.
Beneficial effects of the present invention: 1, the present invention makes full use of the characteristics of simulating analysis, can accurately obtain cable
The process data that temperature, heat release rate change over time during combustion test；2, the present invention overcomes full-scale test costs
High, risk height, period length, flexibility is poor, pollutes the disadvantages of environment；3, the present invention can simulate a variety of cable models, can
Flexibly modification cable system model parameter.4, modeling period of the invention it is short, it can be achieved that unit cable horizontal firing characteristic it is fast
Speed is examined.
Detailed description of the invention
Fig. 1 is a kind of for quickly examining the emulation mode process of the flat combustion characteristics of single cable water of one embodiment
Figure；
Fig. 2 is cable, combustion chamber simulation model and the grid dividing established using fire dynamics simulation softward (FDS)；
Fig. 3 is that the heat release rate that a heat release rate sensor obtains in embodiment changes over time curve；
Fig. 4 is that the temperature that a temperature sensor obtains in embodiment changes over time curve.
Specific embodiment
With reference to the accompanying drawing to of the invention a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water
Specific embodiment be described in detail.
Fig. 1 shows a kind of for quickly examining the emulation mode flow chart of the flat combustion characteristics of single cable water, main packet
Include following steps:
Step S1 establishes the Three-dimensional Combustion room model met the requirements according to GB/T 12666.2-2008:
Being established in FDS according to GB/T 12666.2-2008 at least has 4m3The combustion chamber of volume；
Cable system model parameter is arranged in step S2:
Determine tested wire cable model, obtain cable data, including construction of cable dimensional parameters, insulating materials attribute,
Sheath material attribute；Determine test original ambient temperature；According to standard setting Ignition sources for fire and time of ceasing fire；By all ginsengs
In number input cable system model；
Step S3 carries out burning emulation:
Several temperature, heat release rate sensor are set in cable system model；Carry out burning emulation；
Step S4 obtains temperature, heat release rate in combustion process and changes over time data:
Using be arranged in cable model system temperature, heat release rate sensor read combustion process in temperature, heat
Rate of release changes over time process.
For apparent technology of the invention, preferred embodiment is described below.
For step S1, satisfactory combustion chamber is mainly established according to national standard and carries out grid dividing.
This step can be accomplished by the following way:
First, as shown in Fig. 2, establishing the Three-dimensional Combustion room model met the requirements；GB/T 12666.2-2008 regulation burning
Room should at least have 4m3Volume, do not provide the volume of discharge flue, it is specified that at least 2m3The upper of test flame region should be located at
Space is accumulated as heat and flue gas by side；The self-support cabinet that length, width and height are respectively 2m is established using FDS, the periphery of combustion chamber is close
Envelope, insulation open the smoke outlet of a 0.5m × 2m on rear side of top of the box, and for bottom paving with a thickness of 6mm, size is 2m × 2m's
Cotton layer.
Second, grid, which is carried out, using free tetrahedron draws；To test flame region carry out refined net division, to combustion chamber its
He carries out coarse grid division in region.
The effect of grid dividing is a complicated model to be divided into several simple models, and these simple individuals
Between again connect each other, mutually constrain, constitute total.These simple structures are solved, whole variation tendency can be obtained,
Grid is more careful neat, and as a result more accurate, grid is coarse, as a result just has large error.
For step S2, mainly determines tested wire type of cable and model, determines the construction of cable and material properties ginseng
Number determines experimental enviroment parameter, determines that Ignition sources, will be in all parameter input cable system models for the fiery time.
It is illustrated by taking ZB-YJV22-0.6/1kV cable as an example below, step S2 includes the following steps:
First, it determines tested type of cable and model, obtains cable data:
Construction of cable parameter, including the construction of cable, cross-sectional area, conductor diameter, insulating layer can get by the model of cable
Thickness, restrictive coating thickness；Cable insulation material attribute and sheath material attribute include the volume density of material, specific heat capacity, thermal conductivity,
The combustion heat；Four parameters of material properties can be measured using corresponding instrument.
Know that this model construction of cable includes conductor, insulating layer, belting layer, armor, sheath by the cable model of embodiment
Layer；In order to meet the structure of entity cable, the structure in addition to conductor is carried out in the interface simulation software Material Layers
Layered shaping, and surface is set and is calculated by CYLINDRICAL.
Second, determine experimental enviroment parameter:
The environmental parameter of l-G simulation test is set according to the environmental standard of full-scale test, including sample before on-test, is set
Standby and surrounding air stablizes the initial pressure 1bar in (23.0 ± 5.0) DEG C, combustion chamber.
Third, determine Ignition sources for the fiery time:
Standard requirements light blowtorch to sample for fiery 30s.Ignition sources fluorescent tube and vertical direction angle are in 20 °, and fluorescent tube is away from examination
Sample midpoint 40mm, the nominal heat that Ignition sources provide are 37.3MJ/m3。
For step S3, it is imitative that burning mainly is carried out after setting temperature, heat release rate sensor in cable system model
Very.The surface coated square structure of sample of cable is heat release rate sensor in Fig. 2, and temperature sensor is located at sample of cable shield
Inside jacket layer.
Sensor can carry out dynamic monitoring to some region of sample of cable or some temperature put, heat release rate, pass through
Simulation calculation is it can be concluded that the data and curve that the relevant parameter of sensor detection changes over time.
For step S4, the sensor mainly after simulation calculation using setting reads the temperature in combustion process
Degree, heat release rate change over time data.The heat release rate that a heat release rate sensor obtains in embodiment is at any time
Between change curve it is as shown in Figure 3；It is as shown in Figure 4 that the temperature that a temperature sensor obtains in embodiment changes over time curve.
Multi-faceted analysis is carried out to cable fire situation according to the data obtained, judges whether flame retardant cable meets national standard.
The present invention considers wire and cable structure, insulation and sheath attribute simultaneously, experimental enviroment tries cable horizontal firing
The influence tested overcomes the disadvantages of full-scale test is at high cost, risk is high, the period is long, flexibility is poor, pollution environment, has and build
The advantages that mould process is simple, save the cost, and cable model and system model parameter can be modified flexibly, can be realized to single electricity
The quick inspection of cable horizontal firing performance.In the above-described embodiment, the multilayered structure of cable, cable insulation and sheath material category
Property etc., part modification can be carried out to parameter according to different cable model and operating condition, it is seen that the present invention has good mobility
And interactivity.
In the description of this specification, the description of reference term " one embodiment ", " embodiment " means to combine the implementation
Example or example particular features, structures, materials, or characteristics described include at least one embodiment of the present invention or example.
In this specification, the schematic illustration of above-mentioned term may not refer to the same embodiment or example.
Several embodiments of the present invention are expressed for embodiment described above, and the description thereof is more specific and detailed, but not
Limitations on the scope of the patent of the present invention therefore can be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (3)
1. a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water, which comprises the following steps:
According to GB/T 12666.2-2008 establish in the fire dynamics simulation softward (FDS) combustion chamber model met the requirements,
Setting wire and cable model parameter, setting Ignition sources and several sensors carry out burning emulation, obtain cable fire process medium temperature
Angle value, heat release rate change over time data, and the specific method is as follows:
(1) fire dynamics simulation softward is selected, the combustion chamber model met the requirements is established according to GB/T 12666.2-2008；
(2) it determines tested wire cable model, obtains cable data, including construction of cable dimensional parameters, insulating materials attribute, shield
Cover material attribute；Determine test original ambient temperature；According to standard setting Ignition sources for fire and time of ceasing fire；By all parameters
In input cable system model；
(3) several temperature, heat release rate sensor are set in cable system model；Carry out burning emulation；
(4) temperature, heat release rate in combustion process are obtained and changes over time data；Utilize the temperature being arranged in cable model system
Degree, heat release rate sensor read temperature, heat release rate in combustion process and change over time process.
2. a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water, feature according to claim 1
It is, cable model parameter can be modified flexibly.
3. a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water, feature according to claim 1
It is, temperature, heat release rate observation point position can be arbitrarily selected in cable system and can be derived that temperature, heat release rate
Change over time process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910383187.0A CN110110443A (en) | 2019-05-08 | 2019-05-08 | It is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water |
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| CN201910383187.0A CN110110443A (en) | 2019-05-08 | 2019-05-08 | It is a kind of for quickly examining the emulation mode of the flat combustion characteristics of single cable water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823954A (en) * | 2019-11-21 | 2020-02-21 | 国网重庆市电力公司电力科学研究院 | Cable fireproof blanket/tape quality sampling inspection combustion test device and evaluation method |
| CN111189960A (en) * | 2020-01-10 | 2020-05-22 | 安徽复兴电缆集团有限公司 | Single cable vertical burning test device |
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| CN111189960A (en) * | 2020-01-10 | 2020-05-22 | 安徽复兴电缆集团有限公司 | Single cable vertical burning test device |
| CN111189960B (en) * | 2020-01-10 | 2022-06-10 | 安徽复兴电缆集团有限公司 | Single cable vertical burning test device |
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Application publication date: 20190809 |