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Study of Characteristics of Liquid Ethanol Micro-scale Combustion under the Applied Electric Field

Author: LiuZhiCheng
Tutor: YangZeLiang
School: South China University of Technology
Course: Engineering Thermophysics
Keywords: Electric field Liquid ethanol Microscale Stable combustion flow Impulse voltage
CLC: TK16
Type: Master's thesis
Year: 2011
Downloads: 28
Quote: 0
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Abstract

With the rapid development of micro-electro-mechanical technology, research and development of micro-power systems has become a hot issue in scientific, micro-power systems with a wide range of applications in the building of national defense and national economy prospects, there is a large potential for development and application. One of the core technology of the micro-power systems is the development and design of the micro-burner, micro burner combustion of hydrocarbon fuels release heat in the form of heat, electricity and power conversion. The fuel in the micro-burner is a micro-scale combustion, there is essentially different from the conventional scale combustion, will encounter, such as surface area to volume ratio of the relative increase in the fine-scale conditions, the increase in the amount of heat loss, and shorten the time scale problem. At home and abroad are still fine-scale conditions under flame characteristics of the combustion process, stable combustion mechanism. Combustion of liquid ethanol under strong electric field microscale diffusion flame experimental study, the main contents of the introduction of the experimental system device, the main steps of the experiment, the combustion flame image processing, acquisition and processing of the experimental data, the analysis of the experimental results . In the experiment during the study, to select two different specifications of microscale burner, one of which is a ceramic tube burners, a quartz glass burner. Ceramic tube the inner diameter of the burner is 1.0 mm, an outer diameter of 2.0 mm; quartz glass burner inner diameter of 1.0 mm, an outer diameter of 1.3 mm. Medical syringe pump to the fuel supply and control of micro-flow liquid; model SEZ-300 stereo microscope with digital camera the composed image acquisition system for observation and shooting microscale flame structure and ethanol vaporization depth image; using S-type platinum-rhodium alloy thermocouple measurement microscale maximum temperature of the flame region; using high voltage DC power supply with the round copper electrode constitute a uniform electric field, by suddenly opening and closing high voltage DC power to simulate the impact of voltage. Experimental study of effects of flame structure and morphology, the maximum temperature of the flame, the flow range of stable combustion, ethanol vaporization depth and impulse voltage of burning microscale phenomena and laws of the combustion process. Studied the influence of the different electrode sizes of liquid ethanol microscale flame shape and temperature, the electric field stable combustion limit the impact on ethanol combustion analysis of electrode size impact on ethanol vaporization characteristics, particularly impulse voltage under the action of the flame characteristic and changes law, to explore the factors that affect the combustion of liquid fuels microscale and analysis of the characteristics of these factors. Draw the corresponding experimental results: The height of the flame is increased with increasing the electrode size is reduced with the reduction in size of the electrode; regardless of forward or reverse electric field, the electrode size increases the maximum temperature of the flame of the liquid ethanol microscale enhance the role; positive electric field stable combustion flame flow limit less affected, so that the maximum flow rate of stable combustion decreased significantly narrow the stable combustion flow; reverse electric field on the flame stable combustion flow limits greater impact, so that stable combustion flow range are improved; very different forward and reverse impact voltage microscale ethanol combustion flame, the compression action of the reverse electric field of the flame is significantly greater than the positive electric field on the stretching effect of the flame, The compression ratio is greater than the tensile elongation; forward electric field with the role of the flame combustion stabilization was significantly superior to the reverse electric field in the quartz glass tube do burner. Finally, the final research progress of the recommendations and suggestions of future research work.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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