Three-Dimensional Direct Numerical Simulation of Near-Field Ozone-Enhanced Lean Premixed Syngas Turbulent Jet Flame

Cong Xu, Junguang Lin, Zhihua Wang, Kaidi Wan, Shien Sun and Zhijun Zhou
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Cong Xu: College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Junguang Lin: College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Zhihua Wang: College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Kaidi Wan: Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo 100190, China
Shien Sun: Zhejiang Energy R&D Institute Co., Ltd., Hangzhou 311121, China
Zhijun Zhou: College of Energy Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2022, vol. 15, issue 11, 1-15

Abstract: Due to its enhancement in the flame speed, ozone added in lean premixed syngas turbulent jet flame was investigated by the three-dimensional direct numerical simulation method in the near field of the flame. In the present study, numerical simulations were conducted in the lean premixed syngas turbulent jet flame configuration to explore the effects of ozone addition on freely-propagating turbulent flames. It was seen that turbulence began to significantly affect the flame surface to produce wrinkles in lean premixed gas flame with ozone added after 4D; ozone started to affect the composition field and temperature field after 8D; it accelerated the generation of intermediate products, OH and O radicals; and it will promote the production of CO 2 in the near field range. Ozone will increase the flame surface area of the lean premixed syngas flame during the ignition period and can promote the ignition process and make the combustion occur earlier. The flame surface of the case with ozone added is more easily stretched by turbulence, and ozone can improve the stability of combustion. Ozone does not affect the effective radius of the flame curvature but will broaden the distribution of the curvature term because of the enhancement effect on the displacement speed of the flame surface.

Keywords: ozone; premixed; lean; syngas; turbulence; direct numerical simulation; enhancement (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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