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Experimental Investigation of Plasma Assisted Combustion Using DBD Actuator

Khazaeely Najafabady, Erfan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54255 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mardani, Amir
  7. Abstract:
  8. In this study, an Experimental investigation of plasma-assisted combustion using a DBD actuator has been performed. This actuator ionizes the fluid flow by producing asymmetric and cold plasma. Ionizing the flow of fuel or air in the combustion chamber reduces the combustion time scale. The test chamber consists of two coaxial quartz tubes that fuel passes through the central tube and the air pass through the side tube. In the case of fuel (natural gas) ionization, one rod as the electrode passes through the center tube, and the second electrode closes in a loop around the inner tube. One annular electrode is closed around the central tube during air ionization, and the second electrode is closed around the outer tube. In both cases of fuel and air ionization, the quartz tube acts as a dielectric. The data collection method is using digital camera imaging and three thin-band pass filters at 430, 470, and 610 nm. By changing the distance of the electrodes from the combustion field, a total of 10 different regimes for the flame have been identified. These regimes strongly depend on the location of the electrodes and their distance from the flame location. At distances less than 10 mm, the plasma decreases the flame length, and at distances greater than 10 mm, it increases the flame length. Plasma also increases the flame's stability and even causes the flames that separated from the burner to stick to the nozzle again. Plasma also reduces the maximum radiation in the 470 nm filter by 30 percent
  9. Keywords:
  10. Diffusion Flame ; Plasma ; Combustion ; Dielectric-Barrier Discharge (DBD)Plasma Actuator ; Experimental Combustion ; Assisted Combustion

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