CN100554924C - Method of equispaced heating - Google Patents
Method of equispaced heating Download PDFInfo
- Publication number
- CN100554924C CN100554924C CNB2006101510717A CN200610151071A CN100554924C CN 100554924 C CN100554924 C CN 100554924C CN B2006101510717 A CNB2006101510717 A CN B2006101510717A CN 200610151071 A CN200610151071 A CN 200610151071A CN 100554924 C CN100554924 C CN 100554924C
- Authority
- CN
- China
- Prior art keywords
- particle
- equispaced
- heating
- temperature
- reaction unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Method of equispaced heating, it relates to a kind of method of equispaced heating.It has solved present measurement high temperature particle performance is to carry out actual engine run, expense costliness, the uncontrollable problem of distribution of particles and temperature characterisitic.The step of its method is as follows: taking by weighing diameter is 1～500 μ m particle, and particle is added particle screening even distribution device, starts power supply, and pre-hot particle is by the temperature in the thermocouple measurement body of heater; Preheated particles is sized and uniform, heating by the small opening whereabouts particle of price fixing and Moving plate; The working medium nozzle is aimed at body of heater by jacking gear, and after opening the air valve of gas cylinder, gas upwards sprays the particle suspension that makes screening, and the transmissivity, absorption coefficient and the particle diameter that record particle distribute disable motor.The present invention has and reduces cost, and the distribution and the temperature characterisitic of particle are controlled, and the advantage of reliable experimental is provided for the rerum natura research of further investigation high temperature particle spectral characteristic.
Description
Technical field
The present invention is specifically related to a kind of method of equispaced heating.
Background technology
The particle state material is present in a plurality of applications such as chemical industry, metallurgy, power, building, medicine, biology, food, space flight, meteorology in a large number, and the research of particle problem relates to a plurality of subjects such as astrophysics, geophysics, optics, electromagnetics, microphysics, biology, colloidal chemistry, acoustics, military science.Typically containing the particle medium comprises: contain the flame of carbon black and flying dust, jet and solid-rocket tail bright eruption contain particulate trnaslucent materials such as photosensitive material, contain particulate infrared stealth coating, nano particle semiconductor material such as cadmium selenide, vulcanized lead etc.Simultaneously, in high-temperature burning system even under the normal temperature state, ultra-fine elementary particle (as the metallics in coal ash particle, rocket tail bright eruption and the super burn engine bright eruption etc.) can be gathered into the aggregative state cluster of shape, different sizes, its spectral characteristics of radiation is the important parameter of key characteristics such as design solid propellant rocket specific impulse, ablator and plumage flame be stealthy, mainly be to measure at present, need to drop into lot of manpower and material resources by the real engine test run.
Radiation characteristic at particle and particle system, a lot of researchs were done by Britain, the U.S., Japan, the former Soviet Union, its research method has two kinds: 1, based on electromagnetic theory, determine the monochromatic complex index of refraction of particle earlier, add parameters such as particle concentration, size distribution, temperature thus, calculate scattering, decay and the absorption coefficient of particle system with the MieShi theory; 2, based on experiment, at the scene or laboratory measurement contain the absorption or the radiation of particle air-flow, according to absorbing or radiant quantity determines to contain the effective blackness or the effective attenuation factor of particle air-flow.The optical constant of particle (complex index of refraction) belongs to the basic physical properties parameter, and is relevant with its component, temperature, surface appearance.Because the specific surface area of particle is more much bigger than its cake mass, and the easy gathering of high temperature particle is agglomerating, causes particle surface situation complexity, and therefore, the optical constant of particle is not equal to the optical constant of constituent particle material.And by particle spectrum complex index of refraction data, the radiation characteristic of research particle and aggregate particles system, not only the research to the radiation rerum natura has the high theoretical meaning, and has actual application value widely.But the research of at present relevant with power coal, ash, carbon black particle radiation characteristic is more, the metal relevant with other field (as rocket engine) and the research of metal oxide particle are less, especially at high temperature, the data published of this class particle complex index of refraction are difficult to find.Because the size of particle is too little, the thermophysical property measurement of single particle is difficult to realize that Chang Yong method is that kind of a particle is made film or suspending liquid in the world, measures again, and such test result and particle aloft suspend and also have bigger gap.Simultaneously, the gas of foreign study or suspension thermophysical property measurement technology are considered practical problemss such as temperature survey, sample heating, and the size of sample can not be done very for a short time, so also be not real particle radiation characteristic.
At present how to obtain controlled equally distributed high temperature Particle Field is a difficult problem always.Conventional method is to carry out actual engine run, but such distribution of particles and temperature characterisitic is uncontrollable, can't do deep quantitative scientific research.
Summary of the invention
The present invention seeks in order to solve present measurement high temperature particle performance is to carry out actual engine run, the expense costliness, and the uncontrollable problem of distribution of particles and temperature characterisitic provides a kind of method of equispaced heating.The step of the inventive method is as follows: a, open spectrometer, the radiation intensity of witness mark radiating light source 3 times; B, to take by weighing diameter be 1～500 μ m particle, particle added the particle screening even distribution device that is positioned at reaction unit top; C, startup power supply, pre-hot particle, by the temperature in the thermocouple measurement reaction unit, temperature is controlled at room temperature～1600K, adopts the cyclic water jacket insulation; D, preheated particles are fallen by the small opening of price fixing and Moving plate under the price fixing of particle screening even distribution device and Moving plate open mode, and particle is sized and uniform, heating; E, the working medium nozzle that will be positioned at the suspension working medium preheating chamber of reaction unit bottom are aimed at reaction unit by jacking gear, and behind the air valve of suspension working medium preheating chamber, gas upwards ejection makes the particle suspension of screening; F, aim at measured hole on the reaction unit with CCD camera, and it is connected situation in the image monitoring body of heater that is imported into by CCD with computing machine, under the control of computing machine, observe the suspended state of particle by zoom, according to the suspended state of sieve particle in the stove, speed and flow that variable valve is adjusted gas make the particle that is suspended in the body of heater be in relative steady state (SS) with the supporting force that the air pressure of the pore at control body of heater top is adjusted gas; G, treat that particle state is stable after, measure the radiation characteristic of particle with FTIR, after repeating to measure for 3 times, the transmissivity, absorption coefficient and the particle diameter that record particle distribute powered-down again.
Principle of the present invention: the suspension of microscopic particle is to keep by the random motion of particle itself fully, as long as there is random motion to exist, particle just can be kept suspended state.If random motion has certain mechanism that dissipates, then need only the energy that someways replenishes the random motion of particulate for keeping original suspended state; Replenish not enoughly as energy, then along with the weakening of random motion, the number density gradient (absolute value) of particle will increase; When the complete obiteration of random motion energy, particle can not suspend fully.Except that needing the additional random motion energy that is dissipated, without any need for the suspension merit of form.Particle have an existing one side that resistance to flow is reduced, the one side that resistance is increased is arranged again, resultant effect is then decided on the relative size of above-mentioned two kinds of effects.But, need acting in any case can not increase resistance to flow owing to suspended particle.In fact, what support that particle suspending needs is power or momentum-exchange along gravity direction, and resistance to flow is a streamwise, so the design of gas suspension is the influence that comes the gravity that equilibrium particle descends with the supporting force of the gas of ejection upwards.
The present invention has and reduces cost, and the distribution and the temperature characterisitic of particle are controlled, and the advantage of reliable experimental is provided for the rerum natura research of further investigation high temperature particle spectral characteristic.
Embodiment
Embodiment one: the step of present embodiment method is as follows: a, open spectrometer, the radiation intensity of witness mark radiating light source 3 times; B, to take by weighing diameter be 1～500 μ m particle, particle added the particle screening even distribution device that is positioned at reaction unit top; C, startup power supply, pre-hot particle, by the temperature in the thermocouple measurement reaction unit, temperature is controlled at room temperature～1600K, adopts the cyclic water jacket insulation; D, preheated particles are fallen by the small opening of price fixing and Moving plate under the price fixing of particle screening even distribution device and Moving plate open mode, and particle is sized and uniform, heating; E, the working medium nozzle that will be positioned at the suspension working medium preheating chamber of reaction unit bottom are aimed at reaction unit by jacking gear, and behind the air valve of suspension working medium preheating chamber, gas upwards ejection makes the particle suspension of screening; F, aim at measured hole on the reaction unit with CCD camera, and it is connected situation in the image monitoring body of heater that is imported into by CCD with computing machine, under the control of computing machine, observe the suspended state of particle by zoom, according to the suspended state of sieve particle in the stove, speed and flow that variable valve is adjusted gas make the particle that is suspended in the body of heater be in relative steady state (SS) with the supporting force that the air pressure of the pore at control body of heater top is adjusted gas; G, treat that particle state is stable after, measure the radiation characteristic of particle with FTIR, after repeating to measure for 3 times, the transmissivity, absorption coefficient and the particle diameter that record particle distribute powered-down again.
Embodiment two: the particle of present embodiment is the specpure Al that Shanghai chemical reagent head factory is produced
2O
3Particle.Other is identical with embodiment one.
Embodiment three: the particle diameter size of present embodiment is 1～150 μ m.Other is identical with embodiment one.
Embodiment four: the particle diameter size of present embodiment is 150～300 μ m.Other is identical with embodiment one.
Embodiment five: the particle diameter size of present embodiment is 300～500 μ m.Other is identical with embodiment one.
Embodiment six: the thermopair of present embodiment is high temperature platinum rhodium-platinum thermocouple and optics color comparison temperature measurement meter.Other is identical with embodiment one.
Temperature is monitored by high temperature platinum rhodium-platinum thermocouple and optics color comparison temperature measurement meter (the LBW-B precision reaches 1%), by temperature regulator heating tube is regulated and controlled, the temperature that reaches expection guarantees that preheating chamber is consistent with the temperature of particle in the measuring chamber in measuring process.Thermocouple probe design is placed on body of heater highest temperature place, i.e. measuring center is measured the maximum temperature of high temperature furnace.
Embodiment seven: the water temperature in the cyclic water jacket of present embodiment is room temperature～80 ℃.Other is identical with embodiment one.
Embodiment eight: the Moving plate rotational speed of present embodiment is 0～1200 rpm.Other is identical with embodiment one.
The rotational speed of present embodiment Moving plate guarantees the even whereabouts of particle.
Embodiment nine: particle is heated to room temperature～900 ℃ in the present embodiment.Other is identical with embodiment one.
Embodiment ten: particle is heated to 900～1300 ℃ in the present embodiment.Other is identical with embodiment one.
Embodiment 11: the gas cylinder of present embodiment adopts the high-pressure liquid nitrogen bottle.Other is identical with embodiment one.
The gas cylinder of present embodiment adopts the advantage of high-pressure liquid nitrogen bottle to be: (1) nitrogen itself is difficult for and other material generation chemical reactions, and be rich in nitrogen in the air, can not produce pollution as gas-jar, human body also is safe from harm, be the suspension working medium of environment-friendly type.(2) owing to select for use highly purified nitrogen as suspension working medium, do not contain other impurity, the purity height, it is single to test resulting background spectrum radiation characteristic, thereby, the more accurate also easier reproduction of experimental result.(3) under condition of the present invention, nitrogen can be with laboratory sample generation chemical reaction, thereby is a kind of safe suspension working medium to laboratory sample.
For detecting effect of the present invention, adopt the method for embodiment one, taking by weighing diameter is the specpure Al that 50 μ m particles select for use Shanghai chemical reagent head factory to produce
2O
3Particle, particle is consistent through preheating and heating with the temperature of measuring chamber, uniform the good results are evident, reaches approximate static equispaced.
The present invention has and reduces cost, and distribution and the temperature characterisitic of particle are controlled, is the further investigation high-temperature particle The rerum natura research of spectral characteristic provides the advantage of reliable experimental data.
Claims (8)
1, a kind of method of equispaced heating is characterized in that the step of method is as follows: a, open spectrometer, the radiation intensity of witness mark radiating light source 3 times; B, to take by weighing diameter be 1～500 μ m particle, particle added the particle screening even distribution device that is positioned at reaction unit top; C, startup power supply, pre-hot particle, by the temperature in the thermocouple measurement reaction unit, temperature is controlled at room temperature～1600K, adopts the cyclic water jacket insulation; D, preheated particles are fallen by the small opening of price fixing and Moving plate under the price fixing of particle screening even distribution device and Moving plate open mode, and particle is sized and uniform, heating; E, the working medium nozzle that will be positioned at the suspension working medium preheating chamber of reaction unit bottom are aimed at reaction unit by jacking gear, and behind the air valve of suspension working medium preheating chamber, gas upwards ejection makes the particle suspension of screening; F, aim at measured hole on the reaction unit with CCD camera, and it is connected situation in the image monitoring body of heater that is imported into by CCD with computing machine, under the control of computing machine, observe the suspended state of particle by zoom, according to the suspended state of sieve particle in the stove, speed and flow that variable valve is adjusted gas make the particle that is suspended in the body of heater be in relative steady state (SS) with the supporting force that the air pressure of the pore at control body of heater top is adjusted gas; G, treat that particle state is stable after, measure the radiation characteristic of particle with Fourier transformation infrared spectrometer, after repeating to measure for 3 times, the transmissivity, absorption coefficient and the particle diameter that record particle distribute powered-down again.
2, method of equispaced heating according to claim 1 is characterized in that the particle diameter size is 1～150 μ m.
3, method of equispaced heating according to claim 1 is characterized in that the particle diameter size is 150～300 μ m.
4, method of equispaced heating according to claim 1 is characterized in that the particle diameter size is 300～500 μ m.
5, method of equispaced heating according to claim 1 is characterized in that water temperature in the cyclic water jacket is room temperature～80 ℃.
6, method of equispaced heating according to claim 1 is characterized in that the Moving plate rotational speed is 0～1200 rpm.
7, method of equispaced heating according to claim 1 is characterized in that particle is heated to room temperature～900 ℃.
8, method of equispaced heating according to claim 1 is characterized in that particle is heated to 900～1300 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101510717A CN100554924C (en) | 2006-11-27 | 2006-11-27 | Method of equispaced heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101510717A CN100554924C (en) | 2006-11-27 | 2006-11-27 | Method of equispaced heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1971239A CN1971239A (en) | 2007-05-30 |
| CN100554924C true CN100554924C (en) | 2009-10-28 |
Family
ID=38112162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101510717A Expired - Fee Related CN100554924C (en) | 2006-11-27 | 2006-11-27 | Method of equispaced heating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100554924C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447403B (en) * | 2021-06-11 | 2022-05-03 | 南京航空航天大学 | Heating device for measuring spectral emissivity of high-temperature particle curtain |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2846520B2 (en) * | 1992-02-20 | 1999-01-13 | キヤノン株式会社 | How to measure the particle size or average particle size of ultrafine particles |
-
2006
- 2006-11-27 CN CNB2006101510717A patent/CN100554924C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2846520B2 (en) * | 1992-02-20 | 1999-01-13 | キヤノン株式会社 | How to measure the particle size or average particle size of ultrafine particles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1971239A (en) | 2007-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Julien et al. | Effect of scale on freely propagating flames in aluminum dust clouds | |
| Lee et al. | A study of natural convection above a line fire | |
| Savino et al. | Buoyancy and Marangoni effects in an evaporating drop | |
| Chigier | Combustion measurements | |
| Takahashi et al. | Study on unsteady molten insulation volume change during flame spreading over wire insulation in microgravity | |
| Sangiovanni et al. | A theoretical and experimental investigation of the ignition of fuel droplets | |
| Weng et al. | A novel multi-jet burner for hot flue gases of wide range of temperatures and compositions for optical diagnostics of solid fuels gasification/combustion | |
| Lee et al. | Motion of single pulverized coal particles in a hot gas flow field | |
| Braikia et al. | Improvement of thermal homogenization using multiple swirling jets | |
| CN102279049A (en) | Device and method for measuring high-temperature particle infrared spectrum characteristics | |
| Li et al. | An investigation of combustion of boron suspensions | |
| CN100554924C (en) | Method of equispaced heating | |
| Migita et al. | Methodology to achieve pseudo 1-D combustion system of polymeric materials using low-pressured technique | |
| Peng et al. | Combustion diagnostics of metal particles: a review | |
| Lee et al. | Propagation mechanisms of combustion waves in dust-air mixtures | |
| Sangiovanni et al. | Observations of flame structure in the combustion of monodispersed droplet streams | |
| Kataoka et al. | Autoignition behavior of a spherical cluster consisted of a center fine droplet and surrounding twelve fine droplets | |
| Korobeinichev et al. | The velocity and structure of the flame front at spread of fire across the pine needle bed depending on the wind velocity | |
| Segawa et al. | Autoignition and early flame behavior of a spherical cluster of 49 monodispersed droplets | |
| Queiroz et al. | A parametric exploration of the dynamic behavior of flame propagation in planar sprays | |
| Hu et al. | Experimental study on diffusive solid combustion behavior during transition from normal-to reduced-gravity | |
| Jarosinski et al. | Visualization of dust explosion under microgravity conditions | |
| Ang et al. | Temperature and velocity profiles in sooting free convection diffusion flames | |
| Wang et al. | Experimental and numerical simulations of compound heat transfer in an internally circulating fluidized bed | |
| Valiullin et al. | New approach to study the ignition processes of organic coal-water fuels in an oxidizer flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091028 Termination date: 20121127 |