Numerical and Experimental Investigation of a Non-Premixed Double Swirl Combustor

Jiming Lin, Ming Bao, Feng Zhang, Yong Zhang and Jianhong Yang
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Jiming Lin: College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
Ming Bao: College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
Feng Zhang: College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
Yong Zhang: College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China
Jianhong Yang: College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China

Energies, 2022, vol. 15, issue 2, 1-16

Abstract: This paper focuses on a detailed numerical investigation combined with experimental research for a non-premixed swirl combustor, which aims to analyze the effects of the blade angle of the outer swirler and equivalence ratio on flow and combustion characteristics. In the experiment, the temperature in the furnace was obtained with a thermocouple, while a realizable k - ε turbulence model and two-step reaction mechanism of methane and air are used in the numerical method. The calculation results are in good agreement with the experimental data. The results reveal that the air flow rate through the swirler accounts for a small amount of the total air due to the influence of the draft fan, and there is no central recirculation zone (CRZ) despite the presence of the swirler. It was also found that NO emissions gradually decrease as the blade angle of the outer swirler increases. It was also indicated that the average temperature is 100 K higher than the general combustor with a 58° blade angle in the furnace by increasing the equivalent ratio of the tertiary air area, and the NO emissions reduced by approximately 25%. This study can provide guidance for the operation and structural design of non-premixed swirl combustors.

Keywords: non-premixed; swirl combustor; numerical modeling; pollutant emission (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: 2022
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