Mechanical & Aerospace Engineering

Biography

Biography: Seyed Ehsan Hosseini

Abstract

Depletion of fossil fuel resources and increasing rates of pollutant formation have motivated the combustion community to work on combustion effi ciency improvement. Recently, fl ameless combustion systems have been widely developed due to extremely low pollutant formation and fuel consumption reduction in fl ameless mode. In the flameless regime, the combustion air is highly preheated without increasing the rate of pollutant formation, in  particular, NOx emissions. Th e non-premixed air/fuel is injected into the combustor at high velocities; hence, the availability of oxygen in the reaction zone reduces. In fact, the reaction zone is dispersed throughout the furnace, the hot spots are eliminated and uniform temperature is observed in the chamber. Investigation of combustion stability is still the most important issue in fl ameless combustion systems. In this regard, the objective of this study is to experimentally investigate the eff ects of a recuperation system on the stability of a labscaled fl ameless combustion system and the rates of pollutant formation. In this design, fuel is injected axially from one end of the cylindrical-shaped combustion chamber and the air is introduced coaxially from the same side while the fl ue gases are exhausted from the other end of the chamber. To maintain inside temperature of the chamber over auto-ignition temperature of the fuel, a helical pipe is installed inside the chamber to transfer the fresh air from exhaust zone to burner zone and preheat the combustion air (recuperator). Temperature distribution inside the chamber, wall temperature and the temperature uniformity (considered as one of the most important parameters in fl ameless mode) are measured. Various radicals inside the chamber are measured to analyze pollutant formation and stability of fl ameless combustion.