An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

Zhongya Xi, Zhongguang Fu, Xiaotian Hu, Syed Waqas Sabir and Yibo Jiang
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Zhongya Xi: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Zhongguang Fu: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Xiaotian Hu: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Syed Waqas Sabir: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Yibo Jiang: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China

Energies, 2018, vol. 11, issue 6, 1-18

Abstract: The behavior of the pollutants NO and CO at elevated combustor pressure are of special importance due to the continuing trend toward developing engines operating at higher pressure ratios to yield higher thermal efficiency. An experiment was performed to examine the NO and CO emissions for a swirl convergent-divergent nozzle at elevated pressure. The NO and CO correlations were obtained. Meanwhile, the flame length, exhaust gas oxygen concentration, exit temperature and global flame residence time were also determined to analyze the NO and CO emission characteristics. The results showed that, with the increase in combustor pressure P , flame length decreased proportionally to P −0.49 ; exit O 2 volume fraction increased and exit temperature was reduced. The global flame residence time decreased proportionally to P −0.43 . As pressure increased, The NO and Emission Index of NO (EINO) levels decreased proportionally to P −0.53 and P −0.6 respectively, which is mainly attributed to the influence of global flame residence time; the NO and EINO increased almost proportionally with the increase in global flame residence time. The EINO scaling EINO ( ρu e / d ) was proportional to Fr 0.42 , which indicated that compared with pure fuel, the fuel diluted with primary air can cause a decrease in the exponent of the Fr power function. At higher pressure, the CO and Emission Index of CO (EICO) decreased proportionally to P −0.35 and P −0.4 , respectively, due to the increased unburned methane and high pressure which accelerated chemical reaction kinetics to promote the conversion of CO to CO 2 .

Keywords: NO emission; CO emission; swirl convergent-divergent nozzle; combustion at elevated pressure; turbulent non-premixed flame (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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