Mixture Preparation Effects on Distributed Combustion for Gas Turbine Application - Novel Combustion Concepts for Sustainable Energy Development - page 281

Fig. 4 NO emission for different injection arrangements

Fig. 5 CO emission for different injection arrangements

However, premixing air and fuel prior to their introduction to the combustion
chamber demonstrated ultra-low emission levels of 4 PPMNO and 11 PPM CO. The
lower emissions demonstrated from premixed combustion agree with the trend
obtained previously for various combustor con gurations (Arghode and Gupta

2010a , b , 2011 ; Khalil and Gupta 2011a , b , 2013 , 2014a , b ; Arghode et al. 2012 ).
This can be attributed to the fact that the mixing problem in this mode is less
complicated. To achieve distributed combustion mode, air and hot product gases mix
together to form hot diluted oxidizer. Then, the fuel is mixed with that hot diluted
mixture to achieve uniform mixture and spontaneous ignition. However, in premixed
mode, air and fuel are well mixed upstream, which helps in mixture preparation for
distribution condition.