CN104062394A - Gaseous-phase Bunsen burner laminar flame propagation speed measurement device and measurement method for liquid fuel - Google Patents
Gaseous-phase Bunsen burner laminar flame propagation speed measurement device and measurement method for liquid fuel Download PDFInfo
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Abstract
The invention provides a gaseous-phase Bunsen burner laminar flame propagation speed measurement device and a gaseous-phase Bunsen burner laminar flame propagation speed measurement method for a liquid fuel. The device comprises a Bunsen burner, wherein the Bunsen burner is connected with a temperature measurement display (thermocouple), a cold air heating system and a liquid fuel evaporation system respectively; the liquid fuel evaporation system is connected with an injection pump through a rubber pipeline; the cold air heating system is communicated with external air; a flame image acquisition and processing device is arranged beside the Bunsen burner. The device is simple, convenient to operate, low in cost and favorable for basic comparison between burning characteristics of different liquid fuels, and the rapid fuel selection of a spray burning system is supported. A high-speed digital camera is adopted for the measurement method, a flame conical surface can be continuously shot, a flame image cosine law method is used for calculating the gaseous-phase Bunsen burner laminar flame propagation speed of the liquid fuel according to current mixed gas speed, and the measurement method is directly provided based on the definition of the flame propagation speed, and is simple and effective.
Description
Technical field
The present invention relates to liquid fuel gas phase laminar combustion field, specifically a kind of liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism and measuring method thereof.
Background technology
At present, the delivery vehicle recoverable amount of China taking liquid fuel as propellant significantly increases, and energy and environment are asked the focus that becomes people.Along with liquid fuel rise in price, global warming and other series of environmental problems become increasingly conspicuous, and must meet energy-conservation and requirement environmental protection to the quality transformation of liquid fuel.Novel synthetic liquid fuel burning fundamental research is contributed to choosing of spray burning system fuel.The object of Study of Liquid fuel gas phase laminar combustion is to understand liquid fuel reacting dynamics characteristic, liquid fuel gas phase laminar flame velocity of propagation is exactly the embodiment of overall view reaction kinetics, it is not only having very large Practical significance aspect investigation flame holding, and aspect research communication theory, also has very broad theory value.
The documents and materials (paper, report and patent) of announcing up to now mainly concentrate on gaseous fuel aspect by Bunsen burner to the research of laminar flame velocity of propagation, the laminar flame velocity of propagation of liquid fuel is mainly studied by constant volume combustion bomb test unit, although the measurement laminar flame velocity of propagation that constant volume combustion bomb test unit can be more accurate but its complex structure, cost are high, are difficult for realizing.The present invention is evaporated, is mixed liquid fuel by Simple heater, obtain air mixture, air mixture is burnt through the variable Bunsen burner burner of outlet diameter, thereby by Bunsen flame method, liquid fuel gas phase laminar flame velocity of propagation is measured, this system architecture is simple and easy, simple to operate, with low cost; In conjunction with the contactless laminar flame velocity of propagation measuring method based on digital image processing techniques, this system has the advantages that measuring accuracy is high.
Summary of the invention
The present invention, in order to solve the problem of prior art, provides a kind of liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism and measuring method thereof
The present invention includes Bunsen burner burner, Bunsen burner burner is connected with respectively thermometric display (thermopair), cold conditions air heating system and liquid fuel vapo(u)rization system, wherein liquid fuel vapo(u)rization system is connected with syringe pump by rubber pipeline, and cold conditions air heating system communicates with extraneous air; Other flame image collection and the treating apparatus of being equipped with of Bunsen burner burner.
Described cold conditions air heating system liquid fuel evaporation tubes and first pressure regulator being connected with liquid fuel evaporation tubes.
Described liquid fuel evaporation tubes slant setting, with horizontal plane angle be 10-20 °, be made up of heat preserving ceramic pipe, quartz glass tube, nickel chromium triangle electrical heating wire successively from outside to inside, wherein nickel chromium triangle electrical heating wire adopts helix canoe and adopts front close rear thin arrangement.
Described cold conditions air heating system comprises the voltage stabilizing vertical gas storage tank, suspended body flowmeter and the cold conditions air heat pipeline that connect successively, wherein voltage stabilizing vertical gas storage tank communicates with extraneous air, cold conditions air heat pipeline is connected with Bunsen burner burner, and cold conditions air heat pipeline is also connected with the second electric pressure regulator.
Described cold conditions air heat pipeline is followed successively by heating copper tube from inside to outside, quartz glass tube, heat preserving ceramic pipe; Described float flow measuring unit air mass flow is 0L/h～600L/h; The second described electric pressure regulator range of regulation is 0～250V.
Described Bunsen burner burner outlet is the replaceable structure of spiral, and outlet internal diameter is 5mm～15mm, different outlet diameters interval 1mm.。
The computing machine 8 that described flame image collection comprises high-speed camera and is connected with high-speed camera with treating apparatus.
Described syringe pump flow is controlled, and maximum combustion flow is 500ml/h.
The present invention also provides a kind of measuring method of liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism, comprises the following steps:
1) open syringe pump, set fuel flow rate;
2) open liquid fuel evaporation tubes power supply, select the first electric pressure regulator voltage, the pressure in regulator solution fluid fuel evaporation tubes;
3) open the vertical gas storage of air voltage stabilizing and fill with, utilize suspended body flowmeter to select air mass flow;
4) open cold conditions air heat pipeline power supply, select the second electric pressure regulator voltage, regulate the pressure in cold conditions air heat pipeline;
5) use electric spark igniter igniting, go out the stable laminar flame sharp side of interruption-forming at Bunsen burner;
6) utilize electronic console to read Bunsen burner laminar flame temperature, make its temperature stabilization, open high speed camera and catch Bunsen burner outlet layer stream flame front as shown in Figure 4;
7) Bunsen flame image is comprised image cutting-out, gray processing, gray scale stretching, edge extracting, binaryzation, determines cone angle, calculates the batch processing of angle; Described Digital Image Processing program adopts piecewise linear gray transformation (GST) treatment technology to carry out in gray scale processing formula flame image
for the pixel value of input picture,
for the pixel value of output image; [s1]
8) according to formula
calculate the laminar flame velocity of propagation under this condition, in formula
represent normal direction flame propagation velocity on taper flame front,
gas outlet speed,
represent flame front drift angle.
Beneficial effect of the present invention is:
1, simple and easy, the convenient operation, with low cost of device provided by the invention, contributes to the basis contrast of different liquids fuel combustion characteristics, supports the fuel fast selecting of spray burning system.
2, adopt high-speed digital camera, take continuously the flame conical surface, according to current combination gas speed, use flame image cosine law method to calculate liquid fuel gas phase Bunsen burner laminar flame velocity of propagation, the method is the method that the definition based on flame propagation velocity directly provides, simply effective.
3, by changing input parameter, measure oil-poor igniting, the flame failure limit of liquid fuel.
Brief description of the drawings
Fig. 1 is workflow schematic diagram of the present invention.
Fig. 2 is apparatus structure schematic diagram provided by the invention.
Fig. 3 is variable spout diameter Bunsen burner structural drawing.
Fig. 4 is for adopting piecewise linear gray transformation (GST) technology gray level image to process figure.
Fig. 5 is Robert operator marginalisation analysis chart.
Fig. 6 is interior cone angle calculating chart.
Fig. 7 is different temperatures, equivalent proportion laminar flame velocity of propagation change curve.
Fig. 8 is that oil-poor igniting, flame failure limit are with liquid fuel flow changing curve.
Fig. 9 is that oil-poor igniting, flame failure limit are with mixed gas temperature variation curve.
Embodiment
Taking aviation kerosene as measuring object, the invention will be further described with specific embodiment by reference to the accompanying drawings below.
Device provided by the invention as shown in Figure 1, comprise Bunsen burner burner 5, Bunsen burner burner 5 is connected with respectively thermometric display 6, cold conditions air heating system and liquid fuel vapo(u)rization system, wherein liquid fuel vapo(u)rization system is connected with syringe pump 1 by rubber pipeline 2, and cold conditions air heating system communicates with extraneous air; Other flame image collection and the treating apparatus of being equipped with of Bunsen burner burner 5.
Described cold conditions air heating system liquid fuel evaporation tubes 3 and first pressure regulator 4 being connected with liquid fuel evaporation tubes 3.
Described liquid fuel evaporation tubes 3 slant settings, with horizontal plane angle be 10-20 °.Liquid fuel evaporation tubes 3 is made up of heat preserving ceramic pipe, quartz glass tube, nickel chromium triangle electrical heating wire from outside to inside successively, and wherein nickel chromium triangle electrical heating wire adopts helix canoe and adopts front close rear thin arrangement.
Described cold conditions air heating system comprises the voltage stabilizing vertical gas storage tank 12, suspended body flowmeter 11 and the cold conditions air heat pipeline 10 that connect successively, wherein voltage stabilizing vertical gas storage tank 12 communicates with extraneous air, cold conditions air heat pipeline 10 is connected with Bunsen burner burner 5, and cold conditions air heat pipeline 10 is also connected with the second electric pressure regulator 9.
Described cold conditions air heat pipeline 10 is followed successively by heating copper tube from inside to outside, quartz glass tube, heat preserving ceramic pipe; Described float flow measuring unit air mass flow is 0L/h～600L/h; The second described electric pressure regulator range of regulation is 0～250V.
The structure of described Bunsen burner burner 5 as shown in Figure 3, comprises firm banking 13, the female Bunsen burner of tool is installed on firm banking 13 and steps on seat 14, and bottom has externally threaded Bunsen burner fluorescent tube 15 and steps on 14 by screw thread and Bunsen burner and be connected.Bunsen burner outlet is the replaceable structure of spiral, and outlet internal diameter is 5mm～15mm.
The computing machine 8 that described flame image collection comprises high-speed camera 7 and is connected with high-speed camera 7 with treating apparatus.
Described syringe pump 1 flow is controlled, and maximum combustion flow is 500ml/h.
The course of work of the present invention as shown in Figure 1, specifically comprises the following steps realization:
(1) open syringe pump, and fuel flow rate is set in to 70ml/h.
(2) open liquid fuel evaporation tubes power supply, regulating electric pressure regulator voltage is 120V.
(3) open air voltage stabilizing gas storage and fill with, air mass flow is adjusted to 520L/h.
(4) open air heat pipeline power supply, regulation voltage device voltage is 150V.
(5) use electric spark igniter igniting, go out the stable laminar flame sharp side of interruption-forming at Bunsen burner.
(6) thermopair electronic console temperature stabilization, at 290 DEG C, is opened high speed camera and is caught Bunsen burner outlet layer stream flame front.
(7) as shown in Fig. 4, Fig. 5, Fig. 6, Bunsen flame image is comprised image cutting-out, gray processing, gray scale stretching, edge extracting, binaryzation, determines cone angle, calculates to the batch processing of angle, wherein Fig. 4 is for adopting piecewise linear gray transformation (GST) technology gray level image to process figure.Fig. 5 is Robert operator marginalisation analysis chart.Fig. 6 is interior cone angle calculating chart.
(8) according to formula
, calculate the laminar flame velocity of propagation 0.88m/s of aviation kerosene under this condition, in formula
represent normal direction flame propagation velocity on taper flame front,
gas outlet speed,
represent flame front drift angle;
(9) regulate air mass flow 410L/h～740L/h, as shown in Figure 7, obtain the change curve of different equivalent proportion laminar flame velocity of propagation;
(10) regulate electric pressure regulator, mixed temperature degree is changed within the scope of 230 DEG C～290 DEG C, under same temperature, regulate air mass flow to change within the scope of 410L/h～740L/h, as shown in Figure 7, obtain the change curve of different temperatures underflow flame propagation velocity with equivalent proportion;
(11) regulate fuel flow to change in 10ml/h～70ml/h, obtain oil-poor igniting as shown in Figure 8, flame failure limit with liquid fuel flow changing curve;
(12) fuel flow, in the time of 65ml/h, regulates electric pressure regulator to obtain mixed temperature degree and changes within the scope of 230 DEG C～290 DEG C, obtains as shown in Figure 9, and oil-poor igniting, flame failure limit are with mixed gas temperature variation curve.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improve and also should be considered as protection scope of the present invention.
Claims (10)
1. a liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism, it is characterized in that: comprise Bunsen burner burner (5), Bunsen burner burner (5) is connected with respectively thermometric display (6), cold conditions air heating system and liquid fuel vapo(u)rization system, wherein liquid fuel vapo(u)rization system is connected with syringe pump (1) by rubber pipeline (2), and cold conditions air heating system communicates with extraneous air; Other flame image collection and the treating apparatus of being equipped with of Bunsen burner burner (5).
2. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 1, is characterized in that: described cold conditions air heating system liquid fuel evaporation tubes (3) and first pressure regulator (4) being connected with liquid fuel evaporation tubes (3).
3. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 2, it is characterized in that: described liquid fuel evaporation tubes (3) slant setting, with horizontal plane angle be 10-20 °, described liquid fuel evaporation tubes (3) is made up of heat preserving ceramic pipe, quartz glass tube, nickel chromium triangle electrical heating wire from outside to inside successively, and wherein nickel chromium triangle electrical heating wire adopts helix canoe and adopts front close rear thin arrangement.
4. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 1, it is characterized in that: described cold conditions air heating system comprises the voltage stabilizing vertical gas storage tank (12), suspended body flowmeter (11) and the cold conditions air heat pipeline (10) that connect successively, wherein voltage stabilizing vertical gas storage tank (12) communicates with extraneous air, cold conditions air heat pipeline (10) is connected with Bunsen burner burner 5, and cold conditions air heat pipeline (10) is also connected with the second electric pressure regulator 9.
5. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 4, is characterized in that: described cold conditions air heat pipeline (10) is followed successively by heating copper tube from inside to outside, quartz glass tube, heat preserving ceramic pipe; Described float flow measuring unit air mass flow is 0L/h～600L/h; The second described electric pressure regulator range of regulation is 0～250V.
6. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 1, is characterized in that: described Bunsen burner burner (5) outlet is the replaceable structure of spiral, and outlet internal diameter is 5mm～15mm.
7. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 1, is characterized in that: the computing machine 8 that described flame image collection comprises high-speed camera (7) and is connected with high-speed camera (7) with treating apparatus.
8. liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 1, is characterized in that: described syringe pump (1) flow is controlled, and maximum combustion flow is 500ml/h.
9. the measuring method of the liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism described in more than one any one claims, is characterized in that comprising the following steps:
1) open syringe pump, set fuel flow rate;
2) open liquid fuel evaporation tubes power supply, select the first electric pressure regulator voltage, the pressure in regulator solution fluid fuel evaporation tubes;
3) open the vertical gas storage of air voltage stabilizing and fill with, utilize suspended body flowmeter to select air mass flow;
4) open cold conditions air heat pipeline power supply, select the second electric pressure regulator voltage, regulate the pressure in cold conditions air heat pipeline;
5) use electric spark igniter igniting, go out the stable laminar flame sharp side of interruption-forming at Bunsen burner;
6) utilize electronic console to read Bunsen burner laminar flame temperature, make its temperature stabilization, open high speed camera and catch Bunsen burner outlet layer stream flame front as shown in Figure 4;
7) Bunsen flame image is comprised image cutting-out, gray processing, gray scale stretching, edge extracting, binaryzation, determines cone angle, calculates the batch processing of angle;
8) according to formula
calculate the laminar flame velocity of propagation under this condition, in formula
represent normal direction flame propagation velocity on taper flame front,
gas outlet speed,
represent flame front drift angle.
10. the measuring method of liquid fuel gas phase Bunsen burner laminar flame velocity of propagation measurement mechanism according to claim 9, is characterized in that comprising the following steps:
1) by regulating air mass flow, obtain the change curve of different equivalent proportion laminar flame velocity of propagation;
2) by regulating electric pressure regulator, change mixed temperature degree, then regulate air mass flow under same temperature, obtain the change curve of different temperatures underflow flame propagation velocity with equivalent proportion;
3) by regulating fuel flow, obtain flame failure limit with liquid fuel flow changing curve;
4) by regulating electric pressure regulator, change mixed temperature degree, obtain oil-poor igniting, flame failure limit with mixed gas temperature variation curve;
5) curve map obtaining according to above step, obtains measuring oil-poor igniting, the flame failure limit of liquid fuel.
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Cited By (7)
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| CN105258116A (en) * | 2014-11-17 | 2016-01-20 | 浙江大学 | Cone-shaped flame burner suitable for researching liquid fuel burning characteristics and method of cone-shaped flame burner |
| CN106568888A (en) * | 2016-10-20 | 2017-04-19 | 浙江大学 | An experiment apparatus having a pressure stabilizing function and used for measuring the laminar flow burning rate of liquid fuel and a method thereof |
| CN107044992A (en) * | 2016-02-05 | 2017-08-15 | 天津出入境检验检疫局工业产品安全技术中心 | A kind of multi-functional CCD visualizations spray igniting composite testing tester |
| CN108982745A (en) * | 2018-08-10 | 2018-12-11 | 西安科技大学 | Coal sample combustion characteristics test device under varying strength jet flame heat radiation |
| CN109520759A (en) * | 2018-10-26 | 2019-03-26 | 南京航空航天大学 | It is a kind of using aviation kerosine as the premix and pre-evaporation Bunsen burner corrosion chamber of fuel |
| CN113533620A (en) * | 2021-07-06 | 2021-10-22 | 中国科学院广州能源研究所 | Self-adaptive liquid fuel high-temperature laminar flame propagation speed measuring device and method |
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| CN105258116A (en) * | 2014-11-17 | 2016-01-20 | 浙江大学 | Cone-shaped flame burner suitable for researching liquid fuel burning characteristics and method of cone-shaped flame burner |
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| CN107044992A (en) * | 2016-02-05 | 2017-08-15 | 天津出入境检验检疫局工业产品安全技术中心 | A kind of multi-functional CCD visualizations spray igniting composite testing tester |
| CN106568888A (en) * | 2016-10-20 | 2017-04-19 | 浙江大学 | An experiment apparatus having a pressure stabilizing function and used for measuring the laminar flow burning rate of liquid fuel and a method thereof |
| CN106568888B (en) * | 2016-10-20 | 2018-10-19 | 浙江大学 | The experimental provision and its method of measurement liquid fuel laminar burning velocity with voltage stabilizing function |
| CN108982745A (en) * | 2018-08-10 | 2018-12-11 | 西安科技大学 | Coal sample combustion characteristics test device under varying strength jet flame heat radiation |
| CN109520759A (en) * | 2018-10-26 | 2019-03-26 | 南京航空航天大学 | It is a kind of using aviation kerosine as the premix and pre-evaporation Bunsen burner corrosion chamber of fuel |
| CN113531582A (en) * | 2021-06-30 | 2021-10-22 | 东南大学 | Multi-mode metal fuel particle ignition combustion device capable of adjusting atmosphere |
| CN113533620A (en) * | 2021-07-06 | 2021-10-22 | 中国科学院广州能源研究所 | Self-adaptive liquid fuel high-temperature laminar flame propagation speed measuring device and method |
| CN113533620B (en) * | 2021-07-06 | 2023-09-05 | 中国科学院广州能源研究所 | Device and method for measuring propagation speed of high-temperature laminar flame of self-adaptive liquid fuel |
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