CN105548184A - Pipe system for quantizing detonation instability degree of premixed gas and method thereof - Google Patents

Pipe system for quantizing detonation instability degree of premixed gas and method thereof Download PDF

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Publication number
CN105548184A
CN105548184A CN201511021160.5A CN201511021160A CN105548184A CN 105548184 A CN105548184 A CN 105548184A CN 201511021160 A CN201511021160 A CN 201511021160A CN 105548184 A CN105548184 A CN 105548184A
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pipeline
value
flange
cigarette film
detonation
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CN105548184B (en
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赵焕娟
张英华
严屹然
高玉坤
黄志安
白智明
王辉
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University of Science and Technology Beijing USTB
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8405—Application to two-phase or mixed materials, e.g. gas dissolved in liquids

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Pipeline Systems (AREA)

Abstract

The invention relates to a pipe system for quantizing the detonation instability degree of a premixed gas and a method thereof. The pipe system comprises a detonation pipe, a first pipeline, a second pipeline, a smoke membrane and a measuring device, wherein one end of the detonation pipe is in sealing connection with one end of the first pipeline through a first flange; the other end of the first pipeline is in sealing connection with one end of the second pipeline through a second flange; the other end of the detonation pipe and the other end of the second pipeline are respectively sealed through flange end sockets with rubber sealing rings; the measuring device is arranged on the first pipeline and the second pipeline; and the smoke membrane is arranged in the second pipeline and is located on one side with the flange end socket with the rubber sealing ring. The device provided by the invention can be used for reliably, flexibly and quickly acquiring the smoke membrane results of various premixed gases under different initial pressures; a technical method for digitally treating smoke membrane images is supplied; and the method for quantizing the detonation instability degree of the premixed gas is systemically perfected, can be widely applied to the smoke membrane track analysis for the premixed gas and is beneficial to the quantization comparison.

Description

A kind of piping system and method thereof quantizing premix gas explosion Hong instability
Technical field
The present invention relates to mechanism of detonation research method, a kind of piping system and method thereof quantizing premix gas explosion Hong instability of the research of particularly detonation instability and detonation structure.
Background technology
Document 1(Lee, J.H.S.Dynamicsofexothermicity.1995:321-335.GordonandBrea ch.) point out, it is stable that to put out quick-fried mechanism from unstable pinking different.The quantitative research of the mach reflection that shear wave track is formed is extremely important in pinking is propagated.The track that the cigarette film obtained in experiment records is not straight ahead, in order to explain and the reason describing this phenomenon needs to study the unstable degree of gas with various.All the time, the classification of " regular track " and " irregular track " that cigarette film track describes is qualitative and subjective.Its structural property clear and definite is difficult to for the height that cigarette film records irregular shear wave track.Therefore, the detonation instability of quantitative test premix gas is significant to improving mechanism of detonation.With the degree of irregularity of cigarette film track, premix gas explosion Hong instability is described at this.
If directly scanning cigarette film obtains track is very difficult.Because " gray scale is uneven ", " error " that non-homogeneous soot deposits causes, adjustment " gray scale " is required.Document 2(J.J.Lee, FrostD, LeeJHS, KnystautasR (1993) Digitalsignalprocessinganalysisofsoot-foils.ProgressinAs tronauticsandAeronautics, AIAAPress, Washington, 153:182-202.) and document 3(J.J.Lee, D.Garinis, Two-dimensionalautocorrelationfunctionanalysisofsmokedfo ilpatterns, ShockWaves, 1995, 5:169-174.) point out the Freehandhand-drawing writing scan carrying out cigarette film track, obtain the method for the track picture that can carry out digital processing.In the past in decades, although carried out research to the stability theory of pinking, still do not have systematic quantivative approach at present.
Summary of the invention
In order to solve the problem, the object of this invention is to provide a kind of structure simple, easy to use, the cigarette film of multiple premix gas under different initial pressures condition can be obtained, can the different premix gas of quantitative description the unstable degree of detonation the piping system of quantification premix gas explosion Hong instability and method.
Technical scheme of the present invention is: a kind of piping system quantizing premix gas explosion Hong instability, and this system comprises powder squib, the first pipeline, the second pipeline, cigarette film and measurement mechanism;
One end of described powder squib is tightly connected by one end of the first flange and described first pipeline, the other end of described first pipeline is tightly connected by one end of the second flange and described second pipeline, the other end of described powder squib and the other end of described second pipeline seal respectively by the flange end socket with rubber seal, described measurement mechanism is arranged on described first pipeline and the second pipeline, and the inside that described cigarette film is arranged on the second pipeline is positioned at the side of the flange end socket with rubber seal.
Further, described measurement mechanism comprises optical fiber and optical fiber retainer plate, and described optical fiber is separately fixed on the lateral wall of described first pipeline and the second pipeline by optical fiber retainer plate.
Further, described powder squib is metal tube, and described powder squib length is 0.8-1.2m, and internal diameter is 50.8mm-63.5mm.
Further, described first pipeline and the second pipeline are high-strength PC pipe, and internal diameter is 50.8mm-63.5mm.
Further, the thickness of described cigarette film is more than 0.04mm.
Another object of the present invention is to provide the method using the carrying out of above-mentioned piping system to analyze, and specifically comprises the following steps:
First piping system has assembled by step 1., detect sealing, test gas is passed in piping system, the appearance conditions such as utilization calculate the gas dividing potential drop of blasting cartridge build-in test gas, obtain and test initial pressure value accurately, then test gas is ignited, after detonating, then slowly air is put into by vacuumizing in powder squib, wash away vestige to ensure not formed on cigarette film, open cover flange, take out the protective paint that after the cigarette film with trajectory diagram, evenly spray is transparent, described cigarette film is scanned, obtains scan image;
Step 2. carries out quantitatively unstable analysis to obtaining scan image through step 1, be on trajectory diagram with the true altitude of cigarette film and make a perpendicular line, determine the quantity n of the pixel discrete point of perpendicular line, the position of the pixel that this line suddenlys change is recorded when a perpendicular line encounters trajectory, value is designated as ' 1 ', other pixel point value is designated as ' 0 ', each pixel is by dispersion number value, just trajectory diagram is transformed and obtain a discrete function, discrete function is recorded with ordinal function x (n), containing the discrete signal of 1 and 0, n is the quantity of discrete point, x is the value of discrete point, form by ' 1 ' and ' 0 ',
According to following formulae discovery autocorrelation function φ xx(m), formula is as follows:
(formula 1)
In formula, be and y cross correlation function, M is a unit number; Y (n) is the zero padding sequence translation function of x (n), and n is the quantity that all perpendicular line obtain discrete point, and m is shift value, and x is the value of discrete point;
Step 3: calculate the spectrogram form that intuitively can provide autocorrelation function result after terminating, first peak-peak proportion Φ in figure 1st max, namely corresponding Y value, and exceed the multiple Φ of other peak value proportion 1st max/ Φ 2ed maxnamely premix gas explosion Hong instability is provided.
When track is completely regular, discrete function still can repeat with original function after translation one determining deviation; Also only when translation distance is the multiple of orbit interval, discrete function after discrete function and translation repeats completely, the translation distance that so first peak-peak of autocorrelation function ACF is corresponding is exactly main trajectory spacing, and other peak value is to the less orbit interval of answer seizure ratio and multiple.Even irregular track, first peak value of autocorrelation function also represents the highest orbit interval of the frequency of occurrences.Therefore namely first peak-peak proportion of autocorrelation function result and the multiple that exceeds other peak value provide premix gas explosion Hong instability.
Advantage of the present invention and good effect: owing to adopting technique scheme, the present invention reliably obtains the cigarette film result under the different initial pressures of multiple premix gas flexibly fast, provides the technical method of digitized processing cigarette film image.The method of system perfecting quantification premix gas explosion Hong unstable degree, can be widely used in the cigarette film trajectory analysis of premix gas, is beneficial to carry out quantifications and contrast.
Accompanying drawing explanation
Fig. 1 is the structural representation of the piping system of quantification premix of the present invention gas explosion Hong instability.
Fig. 2 is CH 4+ 2O 2the detonation cigarette film trajectory diagram of premix gas original pressure 7.25kPa.
Fig. 3 is CH 4+ 2O 2the left-handed track line chart of premix gas original pressure 7.25kPa cigarette film.
Fig. 4 is CH 4+ 2O 2premix gas original pressure is that the left-handed track of 7.25kPa cigarette film is without biased autocorrelation function.
Fig. 5 is CH 4+ 2O 2premix gas original pressure is the biased autocorrelation function of the left-handed track of 7.25kPa cigarette film.
In figure:
1, powder squib; 2, the first flange, the 3, first pipeline, the 4, second flange, the 5, second pipeline; 6, cigarette film, 7, cover flange, 8, optical fiber retainer plate, 9, optical fiber.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.
Be illustrated in figure 1 a kind of structural representation quantizing the piping system of premix gas explosion Hong instability of the present invention, this system comprises powder squib, the first pipeline, the second pipeline, cigarette film and measurement mechanism;
Described measurement mechanism comprises optical fiber and optical fiber retainer plate;
Wherein, one end of described powder squib is tightly connected by one end of the first flange and described first pipeline, the other end of described first pipeline is tightly connected by one end of the second flange and described second pipeline, the other end of described powder squib and the other end of described second pipeline seal respectively by the flange end socket with rubber seal, described measurement mechanism is arranged on described first pipeline and the second pipeline, the inside that described cigarette film is arranged on the second pipeline is positioned at the side of the flange end socket with rubber seal, described optical fiber is separately fixed on the lateral wall of described first pipeline and the second pipeline by optical fiber retainer plate.Described powder squib is metal tube, and described powder squib length is 0.8-1.2m, and internal diameter is 50.8mm-63.5mm.Described first pipeline and the second pipeline are high-strength PC pipe, and internal diameter is 50.8mm-63.5mm.The thickness of described cigarette film is more than 0.04mm.
Another object of the present invention is to provide the test method of said system, specifically comprises the following steps:
First piping system has assembled by step 1., detect sealing, test gas is passed in piping system, the appearance conditions such as utilization calculate the gas dividing potential drop of blasting cartridge build-in test gas, obtain and test initial pressure value accurately, then test gas is ignited, after detonating, then slowly air is put into by vacuumizing in powder squib, wash away vestige to ensure not formed on cigarette film, open cover flange, take out the protective paint that after the cigarette film with trajectory diagram, evenly spray is transparent, described cigarette film is scanned, obtains scan image;
Step 2. carries out quantitatively unstable analysis to obtaining scan image through step 1, be on trajectory diagram with the true altitude of cigarette film and make a perpendicular line, determine the quantity n of the pixel discrete point of perpendicular line, the position of the pixel that this line suddenlys change is recorded when a perpendicular line encounters trajectory, value is designated as ' 1 ', other pixel point value is designated as ' 0 ', each pixel is by dispersion number value, just trajectory diagram is transformed and obtain a discrete function, discrete function is recorded with ordinal function x (n), containing the discrete signal of 1 and 0, n is the quantity of discrete point, x is the value of discrete point, form by ' 1 ' and ' 0 ',
According to following formulae discovery autocorrelation function φ xx(m), formula is as follows:
(formula 1)
In formula, be and y cross correlation function, M is a unit number; Y (n) is the zero padding sequence translation function of x (n), and n is the quantity that all perpendicular line obtain discrete point, and m is shift value, and x is the value of discrete point;
Step 3: calculate the spectrogram form that intuitively can provide autocorrelation function result after terminating, first peak-peak proportion Φ in figure 1st max, namely corresponding Y value, and exceed the multiple Φ of other peak value proportion 1st max/ Φ 2ed maxnamely premix gas explosion Hong instability is provided.
Embodiment 1
For showing that these detonation instability computing method are common to all kinds of cigarette film track, below not easily to light but the responsive and very irregular CH of track 4+ 2O 2for example, the present invention will be further described with example by reference to the accompanying drawings:
This Detonation Experiments uses the detonator of internal diameter 50.8mm.About the length 1m of leading portion powder squib, first body of the High strength plastic pipe that rear end experimental section adopts two long 2m of list transparent and the second body, consider steadiness for ease of image data, plastic tube is made up of two parts, and the middle rubber ring by flange inside reaches sealing effectiveness.With very sensitive small size C 2h 2+ O 2(employing stoichiometric) is filled in metal powder squib, for promoting that the detonation in test portion starts, ignites the CH that rear section is not too easy to detonate in short distance 4+ 2O 2premix gas.The appearance conditions such as utilization calculate the required C used 2h 2+ O 2premix gas and CH 4+ 2O 2premix gas dividing potential drop, obtains experimental pressure accurately.
Open cover flange, wiped clean tube wall, put into the long diaphragm evenly smoked of 1m in the rear end of experimental section pipe, be called cigarette film, even if employ C 2h 2+ O 2ignite, CH 4+ 2O 2the limit of premix gas ignites (detonation) pressure also at about 5kPa, therefore needs the cigarette film using thickness at more than 0.04mm.Install cover flange.Fixedly optical fiber is housed at experimental section tube outer wall, when detonation face propagates into somewhere, because the material in detonation face is still carrying out chemical reaction, have the generation of light, by Signal transmissions after optical fiber perception to data capsule, the time that the detonation face of obtaining propagates into, and then and optical fiber between distance go out detonation rate by formulae discovery.All explosive mixtures are prepared in the method for bomb by dividing potential drop all in advance, by control panel, gas with various is input to safely in premix gas bomb respectively, after filling tank, premix gas just can be brought into use, to guarantee gas with various Homogeneous phase mixing in tank after placing more than 24h.After detonating, then slowly putting into air by vacuumizing in pipe, washing away vestige to ensure not formed on cigarette film.Open cover flange, take out the protective paint that after cigarette film, evenly spray is transparent, laggard line scanning.
Be greater than 1 pixel owing to drawing middle paintbrush rugosity in cigarette film track and cause continuous pixels, there will be continuous print ' 1 ' when discretize, during optimization, be connected ' 1 ' in discrete function can be optimized.CH after improvement 4+ 2O 2premix gas original pressure is that the biased autocorrelation calculation of the left-handed track of 7.25kPa cigarette film the results are shown in Figure 4, CH after improving 4+ 2O 2premix gas original pressure be the left-handed track of 7.25kPa cigarette film without biased autocorrelation calculation result Fig. 5, auto-correlation result can obviously be changed, and the result after improvement shows peak value more clearly.
According to following formulae discovery autocorrelation function φ xx(m), formula is as follows:
(formula 1)
In formula, be and y cross correlation function, M is a unit number; Y (n) is the zero padding sequence translation function of x (n), and n is the quantity that all perpendicular line obtain discrete point, and m is shift value, and x is the value of discrete point;
Obviously, first peak-peak proportion is higher, and illustrate that data are more concentrated, namely trajectory is more regular, and premix gas explosion is banged more stable.Therefore the ordinate value that first peak-peak of the autocorrelation function result of this cigarette film track is corresponding is the ratio Φ of total data shared by this peak value 1st max=2.7 × 10 -4, this numerical value is very little.First peak-peak exceeds the multiple Φ of other peak value 1st max/ Φ 2ed max=1.42, this ratio is also very little.

Claims (6)

1. quantize a piping system for premix gas explosion Hong instability, be characterised in that: this system comprises powder squib, the first pipeline, the second pipeline, cigarette film and measurement mechanism;
One end of described powder squib is tightly connected by one end of the first flange and described first pipeline, the other end of described first pipeline is tightly connected by one end of the second flange and described second pipeline, the other end of described powder squib and the other end of described second pipeline seal respectively by the flange end socket with rubber seal, described measurement mechanism is arranged on described first pipeline and the second pipeline, and the inside that described cigarette film is arranged on the second pipeline is positioned at the side of the flange end socket with rubber seal.
2. system according to claim 1, is characterized in that, described measurement mechanism comprises optical fiber, optical fiber retainer plate, and described optical fiber is separately fixed on the lateral wall of described first pipeline and the second pipeline by optical fiber retainer plate.
3. system according to claim 1 and 2, is characterized in that, described powder squib is metal tube, and described powder squib length is 0.8-1.2m, and internal diameter is 50.8mm-63.5mm.
4. system according to claim 1 and 2, is characterized in that, described first pipeline and the second pipeline are high-strength PC pipe, and internal diameter is 50.8mm-63.5mm.
5. system according to claim 1 and 2, is characterized in that, the thickness of described cigarette film is more than 0.04mm.
6. what use the piping system as described in claim 1-5 any one carries out an analytical approach, it is characterized in that, specifically comprises the following steps:
First piping system has assembled by step 1., detect sealing, test gas is passed in piping system, the appearance conditions such as utilization calculate the gas dividing potential drop of blasting cartridge build-in test gas, obtain and test initial pressure value accurately, then test gas is ignited, after detonating, then slowly air is put into by vacuumizing in powder squib, wash away vestige to ensure not formed on cigarette film, open cover flange, take out the protective paint that after the cigarette film with trajectory diagram, evenly spray is transparent, described cigarette film is scanned, obtains scan image;
Step 2. carries out quantitatively unstable analysis to obtaining scan image through step 1, be on trajectory diagram with the true altitude of cigarette film and make a perpendicular line, determine the quantity n of the pixel discrete point of perpendicular line, the position of the pixel that this line suddenlys change is recorded when a perpendicular line encounters trajectory, value is designated as ' 1 ', other pixel point value is designated as ' 0 ', each pixel is by dispersion number value, just trajectory diagram is transformed and obtain a discrete function, discrete function is recorded with ordinal function x (n), containing the discrete signal of 1 and 0, n is the quantity of discrete point, x is the value of discrete point, form by ' 1 ' and ' 0 ',
According to following formulae discovery autocorrelation function φ xx(m), formula is as follows:
(formula 1)
In formula, be and y cross correlation function, M is a unit number; Y (n) is the zero padding sequence translation function of x (n), and n is the quantity that all perpendicular line obtain discrete point, and m is shift value, and x is the value of discrete point;
Step 3: calculate the spectrogram form that intuitively can provide autocorrelation function result after terminating, first peak-peak proportion Φ in figure 1st max, namely corresponding Y value, and exceed the multiple Φ of other peak value proportion 1st max/ Φ 2ed maxnamely premix gas explosion Hong instability is provided.
CN201511021160.5A 2015-12-30 2015-12-30 A kind of pipe-line system and its method for quantifying premix gas explosion Hong instability Expired - Fee Related CN105548184B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108387608A (en) * 2018-02-05 2018-08-10 西安交通大学 A kind of experimental provision and method of record detonation cell structure
CN108831275A (en) * 2018-06-04 2018-11-16 北京科技大学 A kind of intuitive detonation pipeline group for showing spiral detonation shear wave and longitudinal wave structure
CN115389204A (en) * 2022-08-17 2022-11-25 哈尔滨工程大学 Detonation wave cell structure acquisition and processing method

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CN205333527U (en) * 2015-12-30 2016-06-22 北京科技大学 Quantify to mix in advance gas explosion hong instability's pipe -line system

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CN101726402A (en) * 2009-12-10 2010-06-09 中国工程物理研究院流体物理研究所 RM instability precise experiment system for film-free heavy-air column interface
CN205333527U (en) * 2015-12-30 2016-06-22 北京科技大学 Quantify to mix in advance gas explosion hong instability's pipe -line system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108387608A (en) * 2018-02-05 2018-08-10 西安交通大学 A kind of experimental provision and method of record detonation cell structure
CN108831275A (en) * 2018-06-04 2018-11-16 北京科技大学 A kind of intuitive detonation pipeline group for showing spiral detonation shear wave and longitudinal wave structure
CN108831275B (en) * 2018-06-04 2020-07-31 北京科技大学 Detonation pipeline set capable of visually displaying structure of transverse waves and longitudinal waves of spiral detonation
CN115389204A (en) * 2022-08-17 2022-11-25 哈尔滨工程大学 Detonation wave cell structure acquisition and processing method

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