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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.


Flame height variation with flow rate.(a) tube 1; (b) tube 2.
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f8: Flame height variation with flow rate.(a) tube 1; (b) tube 2.

Mentions: As shown in Fig. 8, when the liquid fuel evaporated inside the tubes and flowed out form the steady diffusion flame, their flames have similar characteristics to gas fuel flames. Thus, the traditional gas jet flame theory of Roper38 was chosen as a comparison in this study. The flame heights were measured directly from the numerical simulation results in Fig. 8. Traditional gas jet diffusion flame theory suggests that the flame height is directly proportional to flow rate and independent of the tube diameter. The flame height of tube 2, who has a larger inner diameter, is independent of electric field and increases almost linearly with the fuel rate increases. However, the flame height variation in tube 1, who has a smaller inner diameter, shows a completely different trend.


Effects of electric field on micro-scale flame properties of biobutanol fuel
Flame height variation with flow rate.(a) tube 1; (b) tube 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f8: Flame height variation with flow rate.(a) tube 1; (b) tube 2.
Mentions: As shown in Fig. 8, when the liquid fuel evaporated inside the tubes and flowed out form the steady diffusion flame, their flames have similar characteristics to gas fuel flames. Thus, the traditional gas jet flame theory of Roper38 was chosen as a comparison in this study. The flame heights were measured directly from the numerical simulation results in Fig. 8. Traditional gas jet diffusion flame theory suggests that the flame height is directly proportional to flow rate and independent of the tube diameter. The flame height of tube 2, who has a larger inner diameter, is independent of electric field and increases almost linearly with the fuel rate increases. However, the flame height variation in tube 1, who has a smaller inner diameter, shows a completely different trend.

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.