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Experimental Study of Flame Formation Using a Liquid Fuel Electrospray in Small Scales

Jowkar, Saeed | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48638 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Morad, Mohammad Reza
  7. Abstract:
  8. With increasing demand for more efficient combustion processes, alternative processes like application of magnetic and electric fields for modification of combustion have offered possible solutions. In the recent years, liquid electro-spraying has been a hot topic with growing interest due to its wide applications in such area as fuel atomization in combustion systems, which has been investigated in this project. Notice that in this method the liquid fuel in the high voltage electric field between electrodes will be broken into small droplets. In this thesis diffusion combustion of two alcoholic liquid fuels of ethanol and butanol at the exit of a small-scale combustor of vertical Pyrex glass has been investigated. A stainless steel capillary and an aluminum ring are considered as electrodes. Tests were conducted in three parts. In the first part, the graphs of stability regimes for two liquid fuels of ethanol and butanol have been extracted and the amount of voltage needed to be applied for the stabilization of the flame in each regime was determined. In the second part, after a dimensional analysis, the average and maximum length of flame in each regime have been studied and best distance of capillary to ring in which the flame length will be increased, has been found. For butanol fuel with the increasing of the distance of capillary to the ring, average flame length in the high flow rates of liquid severely decreased but for ethanol fuel it is almost independent of the distance of needle to ground electrode. By introducing of a new nondimentional parameter a graph that shows applied voltage changes was plotted. With the increasing of the applied voltage the average length of the flame increased in the parabolic manner. At the end, a FFT analysis was conducted on the fluctuations of the flame in each regime and it was concluded that the flame fluctuations do not depend on the distance of the capillary to ring and the apparatus fluctuates with an average frequency of 10 Hz in high applied voltages and liquid flow rates
  9. Keywords:
  10. Combustion ; Electrospray ; Fast Fourier Transformation (FFT) ; Fuel Injection

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