CN105911216A - Measuring method for interaction of charged particles and flames - Google Patents

Measuring method for interaction of charged particles and flames Download PDF

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Publication number
CN105911216A
CN105911216A CN201610424029.1A CN201610424029A CN105911216A CN 105911216 A CN105911216 A CN 105911216A CN 201610424029 A CN201610424029 A CN 201610424029A CN 105911216 A CN105911216 A CN 105911216A
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China
Prior art keywords
flame
charged
charged particle
charge
granule
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CN201610424029.1A
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Chinese (zh)
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CN105911216B (en
Inventor
杨立军
覃粒子
富庆飞
谢络
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北京航空航天大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/12Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24Arrangements for measuring quantities of charge

Abstract

The invention provides a measuring method for the interaction of charged particles and flames. The interaction mechanism of the charged particles and the flames is revealed by detecting the charge exchange quantity between the charged particles in the flames and the flames, and a simple and feasible experiment method is provided and has the great application value on related research. The method comprises the following steps that 1, the charged particles or uncharged particles suitable for the measuring conditions are generated; 2, the influence of the flames on the charge-mass ratio of the charged particles, the influence of the flames on the charge-mass ratio of the uncharged particles and the charge-to-mass ratio changes of the charged particles without the flame action are measured separately; 3, measuring results obtained in the step 2 are compared to obtain the charge exchange quantity between the flames and the charged particles.

Description

The measuring method that a kind of charged particle interacts with flame
Technical field
The present invention relates to the measuring method that a kind of charged particle interacts with flame, be particularly suited for measuring charged particle and diffusion Charge-exchange amount between flame, belongs to burning and fire-fighting technique field.
Background technology
The ionisation effect that flame reaction district occurs is the key character of flame.As a example by carbon hydrocarbon fuel, at the normal pressure of equivalent mixing ratio In premixed flame, ion concentration is at 109 1010/cm3.Although the ion component accounting in hydrocarbon flame is the least (at normal pressure bar 1st/6000000000th of whole molecular amounts is accounted under part), but chemical ion is but most important to the control of flame with diagnosis.
Ionization property based on flame, is that to act on flame be a kind of simple Combustion System side to charge carrier with fine particle Formula, charged mist fire-fighting is exactly a kind of typical case's application of above-mentioned mechanism of action, preventing at the important place such as Aeronautics and Astronautics, naval vessel Fire has important using value.But not enough with the understanding of flame interaction mechanism to charged water droplet, it is that restriction is charged at present The bottleneck of mist fire-fighting technology development.For charged mist fire-fighting study mechanism, the phase interaction of single charged water droplet and flame With being basis, and the charge-exchange between charged water droplet (or charged particle) and flame is to embody a weight of two-way interaction Want aspect, for recognizing charged mist fire-fighting mechanism, improve charged mist fire-fighting effect significant.
Existing about flame characteristics survey quantifier elimination, have focused largely on the aspects such as the shape of flame front, temperature and light intensity, as Application No. " 200710109770.X ", in the patent of entitled " flame detecting device and flame detecting method ", just proposes By the infrared image of flame region being carried out realtime imaging and pattern recognition detects flame;As in Application No. " 201510163989.2 ", in the patent of entitled " flame detector system ", propose to be examined by the light sending flame Survey the flame detector system detecting flame.Equally, related researcher it is also proposed a lot with regard to charged particle charge-mass ratio measurement Method, such as Application No. 201310359398.3, entitled " a kind of charged droplets charge-mass ratio real-time measurement apparatus easy to assemble " Patent is namely based on Faraday cup method and measures the charge-mass ratio of droplet;Application No. 201420831496.2, entitled " a kind of electrostatic Shower nozzle droplet charge-mass ratio detection device " patent in then utilize netted goal method to study charge-mass ratio.It can be seen that existing dress Put major part and the most unilaterally relate to flame characteristics or charged particle charge-mass ratio, the two is combined, particularly charged particle and fire Charge-exchange between flame, does not also have effective method.
Summary of the invention
The present invention proposes the measuring method that a kind of charged particle interacts with flame, by detection charged particle and fire in flame Charge-exchange amount between flame, discloses charged particle and flame interaction mechanism, it is provided that simple experimental technique, right The biggest using value will be had in correlational study.
The technical scheme is that
1. the measuring method that a charged particle interacts with flame, it is characterised in that comprise the following steps:
1) charged particle of applicable measuring condition or not charged granule are generated;2) flame electric charge matter to charged particle is measured respectively The amount impact of ratio, flame are on the impact of the charge-to-mass ratio of not charged granule, the lotus matter of charged particle under not having flame interaction Than change;3) contrast step 2) measurement result, draw the charge-exchange amount between flame and charged particle.
2. step 1 described in) in, the charged particle of described generation or the physical form of not charged granule can be liquid or solid-state Or liquid-solid two-phase form;Particulate matter can be simple substance, it is also possible to be mixture;Granule is allowed to occur becoming during measuring Shape, but will not rupture.
3. step 1 described in) in, use charged particle generator to generate charged particle or not charged granule;The granular size produced Can regulate with particle charge amount, the position that granule departs from generator is positioned at directly over flame, and position height can regulate;Energy Enough producing individual particle, it is also possible to continuously generate multiple granule, generating frequency can regulate.
4. step 1 described in) in, the most described charged particle generator is charged drop generator, described charged drop generator Including generating the device of not charged drop and producing the adjustable static field device of electric field intensity, described electrostatic field is based on electrostatic induction Principle, is sensed as meeting the charged drop of experiment condition by the drop formed through generating the device of not charged drop.
5. step 2 described in) in, measure flame and the impact of the charge-to-mass ratio of charged particle comprised the following steps:
A) charged particle of applicable measuring condition is generated;B) the electric charge matter of the pre-test charged particle of flame is entered at charged particle Amount ratio;C) make charged particle through flame zone;D) after charged particle passes flame, charge-to-mass ratio is measured;E) band is drawn Electricity granule is through the charge-mass ratio change before and after flame.
6. step 2 described in) in, measure flame and the impact of the charge-to-mass ratio of not charged granule comprised the following steps:
F) the not charged granule of applicable measuring condition is generated;G) the not charged granule of pre-test of flame is entered at not charged granule Charge-to-mass ratio;H) make not charged granule through flame zone;I) after not charged granule passes flame, charge-to-mass ratio is measured; J) show that not charged granule is through the charge-mass ratio change before and after flame.
7. step 2 described in) in, the charge-mass ratio change measuring the charged particle under not having flame interaction comprises the following steps:
K) charged particle of applicable measuring condition is generated;L) knock down the flame;M) surveyed before charged particle enters fray-out of flame district The charge-to-mass ratio of amount charged particle;N) charged particle is made freely to drip through fray-out of flame district;O) fire is passed at charged particle Flame measures charge-to-mass ratio after extinguishing district;P) the charge-mass ratio change that charged particle freely drips is drawn.
8. the step 2 described in) in, use non-contact measurement method to measure the charge-to-mass ratio of single charged particle, make charged Granule will not come in contact with measuring parts;Described non-contact measurement method by charged particle in given electric field or magnetic field Movement locus is measured indirectly.
9. the step 2 described in) in, use flame generating means to produce the diffusion flame with free surface;Described flame size Being significantly larger than drop size, the equivalent diameter projected of flame in the vertical direction is more than 50 times of liquid-drop diameter.
10. the step 2 described in) in, charged particle or not charged granule in flame zone only with the burning end product in flame, Combustion intermediate product, gaseous fuel mixture or environmental gas come in contact, and do not connect with the structure member in burner Touch;Described charged particle or not charged granule motion feature in flame zone are the movement of falling object.
The technique effect of the present invention:
Method of the present invention can quantitative measurement individual particle charge-mass ratio under flame interaction change, and surveys also by contrast Amount, it is thus achieved that granule charge-exchange amount therebetween during flame, goes out for research flame ionization characteristic and electrification water smoke Lighter reason provides feasible experimental technique.
Measuring method based on the present invention, can carry out the charged particle under different condition combination and flame interaction experiment.Example As, for charged drop, thus it is possible to vary different drips conditions, as how many in droplet size, liquid droplet charged amount, drop band Electric polarity, a speed of drop, initial drippage height etc.;Different liquid simple substance or liquid flux can be used;All right Use solid particle;Different flame patterns and flame intensity can be used, etc..Rich and varied experiment combination will be for disclosing Charged particle and flame interaction mechanism provide sufficiently, the experimental data of tight association, the biggest by having for correlational study Using value.The compatibility of the measuring method that the present invention proposes is the strongest, it is possible to is simultaneously introduced other measurement means, can greatly extend The research contents of related experiment and using value.
Accompanying drawing explanation
Fig. 1 is the charged particle flow chart with the measuring method embodiment of flame interaction of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
The measuring method that a kind of charged particle interacts with flame, comprises the following steps:
1) charged particle of applicable measuring condition or not charged granule are generated;2) flame electric charge matter to charged particle is measured respectively The amount impact of ratio, flame are on the impact of the charge-to-mass ratio of not charged granule, the lotus matter of charged particle under not having flame interaction Than change;3) contrast step 2) measurement result, draw the charge-exchange amount between flame and charged particle.
As it is shown in figure 1, be the charged particle flow chart with the measuring method embodiment of flame interaction of the present invention.
Charged particle or not charged granule is generated first by charged particle generator;The charged particle of described generation or not charged The physical form of grain can be liquid or solid-state or liquid-solid two-phase form;Particulate matter can be simple substance, it is also possible to be mixing Thing;Allow granule that deformation occurs during measuring, but will not rupture;The granular size produced is permissible with particle charge amount Regulation, the position that granule departs from generator is positioned at directly over flame, and position height can regulate;Individual particle can be produced, Also being able to continuously generate multiple granule, generating frequency can regulate.The most described charged particle generator is charged drop generator, Charged drop generator includes the device generating not charged drop and produces the adjustable static field device of electric field intensity, electrostatic field base In electrostatic induction principle, the drop formed through generating the device of not charged drop is sensed as meeting the charged drop of experiment condition. Produce in the present embodiment is not charged water droplet, and water droplet forms charged water droplet by electrostatic field charge inducing.
The idiographic flow step measured is as follows:
1) selected and set the conditional parameter of charged particle generator;
2) selected and set the conditional parameter of flame generating means, light and keep flame;
3) measure flame charged particle charge-mass ratio is affected;Comprise the following steps: a) generate the charged particle being suitable for measuring condition; B) the charge-to-mass ratio Q1 of the pre-test charged particle of flame is entered at charged particle;C) make charged particle through flame zone;d) Charge-to-mass ratio Q2 is measured after charged particle passes flame;E) show that charged particle passes the charge-mass ratio change before and after flame Δ Q=(Q1-Q2).
4) close the band Electricity Functional of charged particle generator, but keep other conditional parameters constant simultaneously;
5) flame impact on not charged granule charge-mass ratio is measured;Comprise the following steps: f) generate be suitable for measuring condition without Electricity granule;G) the charge-to-mass ratio Q1 of the not charged granule of pre-test of flame is entered at not charged granule;H) not charged granule is made Through flame zone;I) after not charged granule passes flame, charge-to-mass ratio Q2 is measured;J) show that not charged granule is through fire Charge-mass ratio changes delta Q2=(Q1-Q2) before and after flame.Not charged granule referred herein is to refer in particular to enter not charged granule before flame zone, But after flame zone, due to charge-exchange, original uncharged granule can bring electric charge.
6) restart the band Electricity Functional of charged particle generator, and keep identical conditional parameter;
7) flame generating means is closed;
8) charge-mass ratio change during charged particle drippage under not having flame interaction is measured;Comprise the following steps: k) generate suitable Close the charged particle of measuring condition;L) knock down the flame;M) the pre-test charged particle in fray-out of flame district is entered at charged particle Charge-to-mass ratio Q1;N) charged particle is made freely to drip through fray-out of flame district;O) charged particle pass fray-out of flame district it Rear measurement charge-to-mass ratio Q2;P) charge-mass ratio changes delta Q1=(Q1-Q2) that charged particle freely drips is drawn.
9) contrast step 3, step 5 and the measurement result Δ Q of step 8, Δ Q1, Δ Q2, draw flame and charged particle it Between charge-exchange amount.
Wherein, step 3, step 5 can be exchanged with the suitable of step 8.
It should be pointed out that, that the above detailed description of the invention can make those skilled in the art that the invention is more fully understood, But limit the invention never in any form.Therefore, although the invention is had been carried out in detail by this specification and embodiment Explanation, it will be understood by those skilled in the art, however, that still the invention can be modified or equivalent; And all are without departing from the technical scheme of the spirit and scope of the invention and improvement thereof, it is encompassed by the invention patent In the middle of protection domain.

Claims (10)

1. the measuring method that a charged particle interacts with flame, it is characterised in that comprise the following steps:
1) charged particle of applicable measuring condition or not charged granule are generated;2) flame electric charge matter to charged particle is measured respectively The amount impact of ratio, flame are on the impact of the charge-to-mass ratio of not charged granule, the lotus matter of charged particle under not having flame interaction Than change;3) contrast step 2) measurement result, draw the charge-exchange amount between flame and charged particle.
Method the most according to claim 1, it is characterised in that described step 1) in, the charged particle of described generation or The physical form of not charged granule can be liquid or solid-state or liquid-solid two-phase form;Particulate matter can be simple substance, it is possible to To be mixture;Allow granule that deformation occurs during measuring, but will not rupture.
Method the most according to claim 1, it is characterised in that described step 1) in, use charged particle generator raw Become charged particle or not charged granule;The granular size produced can regulate with particle charge amount, the position that granule departs from generator Directly over flame, position height can regulate;Individual particle can be produced, it is also possible to continuously generate multiple granule, raw Frequency is become to regulate.
Method the most according to claim 2, it is characterised in that described step 1) in, the most described charged particle occurs Device is charged drop generator, and described charged drop generator includes that the device generating not charged drop and generation electric field intensity can The static field device adjusted, described electrostatic field is based on electrostatic induction principle, by through generating the drop that the device of not charged drop is formed It is sensed as meeting the charged drop of experiment condition.
5. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, measure flame to band The impact of the charge-to-mass ratio of electricity granule comprises the following steps:
A) charged particle of applicable measuring condition is generated;B) the electric charge matter of the pre-test charged particle of flame is entered at charged particle Amount ratio;C) make charged particle through flame zone;D) after charged particle passes flame, charge-to-mass ratio is measured;E) band is drawn Electricity granule is through the charge-mass ratio change before and after flame.
6. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, measure flame to not The impact of the charge-to-mass ratio of charged particle comprises the following steps:
F) the not charged granule of applicable measuring condition is generated;G) the not charged granule of pre-test of flame is entered at not charged granule Charge-to-mass ratio;H) make not charged granule through flame zone;I) after not charged granule passes flame, charge-to-mass ratio is measured; J) show that not charged granule is through the charge-mass ratio change before and after flame.
7. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, measure and there is no fire The charge-mass ratio change of the charged particle under flame effect comprises the following steps:
K) charged particle of applicable measuring condition is generated;L) knock down the flame;M) surveyed before charged particle enters fray-out of flame district The charge-to-mass ratio of amount charged particle;N) charged particle is made freely to drip through fray-out of flame district;O) fire is passed at charged particle Flame measures charge-to-mass ratio after extinguishing district;P) the charge-mass ratio change that charged particle freely drips is drawn.
8. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, use noncontact Measuring method measures the charge-to-mass ratio of single charged particle, makes charged particle will not come in contact with measuring parts;Described non- Contact measurement method is indirectly to be measured by charged particle movement locus in given electric field or magnetic field.
9. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, use flame to send out Raw device produces the diffusion flame with free surface;Described flame size is significantly larger than drop size, flame in the vertical direction Equivalent diameter projected be more than 50 times of liquid-drop diameter.
10. according to the method one of Claims 1-4 Suo Shu, it is characterised in that described step 2) in, charged particle Or not charged granule in flame zone only with burning end product, combustion intermediate product, gaseous fuel mixture or the ring in flame Border gas comes in contact, and does not comes in contact with the structure member in burner;Described charged particle or not charged granule are at fire Motion feature in flame district is the movement of falling object.
CN201610424029.1A 2016-06-15 2016-06-15 A kind of charged particle and the measuring method of flame interaction CN105911216B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN103439589A (en) * 2013-08-19 2013-12-11 江苏大学 Charged droplet charge-to-mass ratio real-time measurement device easy to disassemble and assemble
US20140170575A1 (en) * 2012-12-14 2014-06-19 Clearsign Combustion Corporation Ionizer for a combustion system, including foam electrode structure
US20150362177A1 (en) * 2014-06-11 2015-12-17 Clearsign Combustion Corporation Flame position control electrodes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202870183U (en) * 2012-11-21 2013-04-10 东北师范大学 Charged droplet charge-to-mass ratio automatic measuring apparatus
US20140170575A1 (en) * 2012-12-14 2014-06-19 Clearsign Combustion Corporation Ionizer for a combustion system, including foam electrode structure
CN103163388A (en) * 2013-03-01 2013-06-19 江苏大学 Measuring method and measuring device of non-contact electrostatic spraying charge-to-mass ratios
CN103439589A (en) * 2013-08-19 2013-12-11 江苏大学 Charged droplet charge-to-mass ratio real-time measurement device easy to disassemble and assemble
US20150362177A1 (en) * 2014-06-11 2015-12-17 Clearsign Combustion Corporation Flame position control electrodes

Non-Patent Citations (3)

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Title
K.H.HOMANN: "Charged Particles in Sooting Flames I.Determination of Mass Distributions and Number Densities in C2H2-O2 Flames", 《BER.BUNSENGES.PHYS.CHEM》 *
M.MATTI MARICQ: "The dynamics of electrically charged soot particles in a premixed ethylene flame", 《COMBUSTION AND FLAME》 *
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