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Effects of electric field on micro-scale flame properties of biobutanol fuel

View Article: PubMed Central - PubMed

ABSTRACT

With the increasing need of smaller power sources for satellites, energy systems and engine equipment, microcombustion pose a potential as alternative power source to conventional batteries. As the substitute fuel source for gasoline, biobutanol shows more promising characteristics than ethanol. In this study, the diffusion microflame of liquid biobutanol under electric field have been examined through in-lab experiment and numerical simulation. It is found that traditional gas jet diffusion flame theory shows significant inconsistency with the experimental results of micro scale flame in electric field. The results suggest that with the increase of electric field intensity, the quenching flow rate decrease first and increase after it reach its minimum, while the flame height and highest flame temperature increase first and drop after its peak value. In addition, it was also observed that the flame height and highest temperature for smaller tube can reach its maximum faster. Therefore, the interaction between microscale effect and electric field plays a significant role on understanding the microcombustion of liquid fuel. Therefore, FLUENT simulation was adopted to understand and measure the impacts of microflame characteristic parameters. The final numerical results are consistent with the experimental data and show a high reliability.

No MeSH data available.


Highest temperature variation with electric field intensity at flow rate of 1.6 ml/h.
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f10: Highest temperature variation with electric field intensity at flow rate of 1.6 ml/h.

Mentions: The electric field intensity has an important influence on the highest temperature of flame. Figure 10 shows the highest temperature variation with electric field intensity at the flow rate of 1.6 ml/h. With the increase of electric field intensity, stronger electric field can produce stronger ion wind, which can move evaporation particles escaped from the nozzle of the tube into the combustion zone to improve the combustion efficiency. This results in higher frame at the highest temperature. As the electric field intensity arrives at its threshold, the highest flame temperature decreases with increasing electric field intensity. The main reason is that ion wind of electric filed is so strong that more combustion particles can be moved out of the combustion zone to degrade the combustion efficiency when the fuel achieves full burning. Maximum value of highest flame temperature and its corresponding electric field intensity are presented in Table 3. As the inner diameter of tube is smaller, the highest temperature can reach maximum value faster, and its corresponding electric field intensity is also lower. It implies that microscale effect and ion wind of electric field can improve fuel combustion efficiency.


Effects of electric field on micro-scale flame properties of biobutanol fuel
Highest temperature variation with electric field intensity at flow rate of 1.6 ml/h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5016967&req=5

f10: Highest temperature variation with electric field intensity at flow rate of 1.6 ml/h.
Mentions: The electric field intensity has an important influence on the highest temperature of flame. Figure 10 shows the highest temperature variation with electric field intensity at the flow rate of 1.6 ml/h. With the increase of electric field intensity, stronger electric field can produce stronger ion wind, which can move evaporation particles escaped from the nozzle of the tube into the combustion zone to improve the combustion efficiency. This results in higher frame at the highest temperature. As the electric field intensity arrives at its threshold, the highest flame temperature decreases with increasing electric field intensity. The main reason is that ion wind of electric filed is so strong that more combustion particles can be moved out of the combustion zone to degrade the combustion efficiency when the fuel achieves full burning. Maximum value of highest flame temperature and its corresponding electric field intensity are presented in Table 3. As the inner diameter of tube is smaller, the highest temperature can reach maximum value faster, and its corresponding electric field intensity is also lower. It implies that microscale effect and ion wind of electric field can improve fuel combustion efficiency.

View Article: PubMed Central - PubMed

ABSTRACT

With the increasing need of smaller power sources for satellites, energy systems and engine equipment, microcombustion pose a potential as alternative power source to conventional batteries. As the substitute fuel source for gasoline, biobutanol shows more promising characteristics than ethanol. In this study, the diffusion microflame of liquid biobutanol under electric field have been examined through in-lab experiment and numerical simulation. It is found that traditional gas jet diffusion flame theory shows significant inconsistency with the experimental results of micro scale flame in electric field. The results suggest that with the increase of electric field intensity, the quenching flow rate decrease first and increase after it reach its minimum, while the flame height and highest flame temperature increase first and drop after its peak value. In addition, it was also observed that the flame height and highest temperature for smaller tube can reach its maximum faster. Therefore, the interaction between microscale effect and electric field plays a significant role on understanding the microcombustion of liquid fuel. Therefore, FLUENT simulation was adopted to understand and measure the impacts of microflame characteristic parameters. The final numerical results are consistent with the experimental data and show a high reliability.

No MeSH data available.