Effect of Wall Temperature on Acetylene Diffusion Flame–Wall Interaction Based on Optical Diagnostics and CFD Simulation

Haifeng Liu, Chao Geng, Zhi Yang, Yanqing Cui and Mingfa Yao
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Haifeng Liu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Chao Geng: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Zhi Yang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Yanqing Cui: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Mingfa Yao: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Energies, 2018, vol. 11, issue 5, 1-15

Abstract: In order to elucidate the effect of wall temperature on a diffusion flame–wall interaction, an acetylene diffusion flame in a head-on quenching type was investigated. Direct photography, two-color thermometry, soot-LII (laser-induced incandescence), OH-LIF (laser-induced fluorescence) and numerical simulation with detailed reaction mechanisms were employed to find out the influence mechanism of wall temperature on near-wall combustion performance and emission characteristics. It is clearly shown through optical diagnostics and computation fluid dynamics (CFD) simulation that, compared with cold wall, the high temperature zone for hot wall becomes wider, and the smaller quenching layer is formed due to the higher wall heat flux. High-concentration soot emission is formed primarily near the outer flame far from the wall. CH 2 O, CO and HC emissions are decreased as wall temperature rises, while the formation of soot and A 4 is increased. A diffusion flame–wall interaction structure is proposed to reveal the influence mechanism of wall temperature.

Keywords: diffusion flame–wall interaction; optical diagnostics; CFD simulation; quenching distance; temperature; 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: 2018
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