An Experimental Investigation on Flame Pulsation for a Swirl Non-Premixed Combustion

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 7, 1-17

Abstract: Flame pulsation has a significant effect on combustion, and understanding its oscillatory behavior is important to the combustion community. An experiment was performed to analyze the pulsation characteristics of a swirl non-premixed flame under various parameters. The results showed that as fuel mass flow rate increased, the puffing frequency increased due to the decreased flame radiation fraction, and the puffing amplitude became smaller resulting in a more stable flame. With an increase in combustor pressure, the flickering frequency declined because of the increasing soot radiation, while the flickering amplitude uniformly increased, leading to more deteriorative flame stability. With an increment in mass flow rate of primary air, the puffing frequency decreased due to the enhanced mixing between fuel and primary air. Also, the puffing amplitude had an oscillating relationship with the mass flow rate of primary air. When the exit velocity of the injector was increased, the flickering frequency diminished nearly linearly because of the improving swirl intensity, and the flickering amplitude was approximately unaffected by injector exit velocity. Moreover, the measured puffing frequencies summarized over all cases varied within the range of 3–22 Hz, the predicted values from theoretical models based on non-swirl flame also fell within this range. The puffing frequency of swirl combustion was more sensitive to the variation in operating conditions than that of non-swirl combustion. Additionally, the obtained correlations indicated that the Strouhal number St was proportional to Fr −1.4 (the Froude number) and Re −2.9 (the Reynolds number), respectively.

Keywords: flame pulsation; swirl non-premixed combustion; flame dynamics; puffing frequency and amplitude; effects of operating parameters (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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