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Experimental Investigation of Plasma-Assisted Swirl Combustion

Ranjbar Najafi, Milad | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58347 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mardani, Amir
  7. Abstract:
  8. In this experimental study, the effects of non-thermal dielectric barrier discharge (DBD) plasma on the swirling non-premixed combustion process within a coaxial natural gas-air burner were comprehensively investigated. The experiments were conducted by applying plasma separately to the fuel and air streams at various distances from their respective outlets to precisely analyze the impact of plasma location and operating conditions on flame stability, geometric structure, and chemiluminescence characteristics. The air entering the combustion chamber was converted into a swirling flow by axial swirlers, which played a significant role in flame stabilization. The results indicate that the presence of plasma, especially when applied in the fuel stream, enhances flame anchoring, increases the flame’s resistance to lean blowout limits, and expands its stability range. Additionally, plasma application improved flame structure, reduced its geometric dimensions, and increased the energy density within the combustion chamber. The findings further demonstrate that the spatial location of the plasma has a significant impact on its performance; specifically, increasing the distance from the outlet reduces its effectiveness. In certain cases, results suggest the existence of an optimal distance for maximizing plasma effectiveness. Spectroscopic and chemiluminescence analyses demonstrated that plasma improved the spatial distribution and concentration of reactive radical species, significantly reducing soot and pollutant emissions while maintaining the heat release rate. Plasma application in the air stream under certain conditions led to increased soot formation, higher pollutant emissions, and a relative reduction in heat release rate. Despite the relatively low power consumption compared to the thermal power of the flame, the DBD plasma technology exhibited substantial positive effects on flame stability, structure, chemiluminescence properties, and pollutant reduction, highlighting its strong potential for enhancing combustion processes and mitigating environmental impacts
  9. Keywords:
  10. Plasma ; Dielectric Barrier Discharge (DBD) ; Combustion ; Spectroscopy ; Nonpremixed Combustion ; Swirl Number

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