The influence of high flux broadband irradiation on soot concentration and temperature of a sooty flame

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• 作者：Xue Dong^a ; ^b ; ^{xue.dong@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhiwei Sun^a ; ^c ; Dahe Gu^a ; ^c ; Peter J. Ashman^a ; ^b ; Zeyad T. Alwahabi^a ; ^b ; Bassam B. Dally^a ; ^c ; Graham J. Nathan^a ; ^c ; ^{graham.nathan@adelaide.edu.au" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Combustion&ndash ; radiation interactions ; Concentrated solar radiation ; Soot volume fraction ; Temperature ; Laser diagnostics
• 刊名：Combustion and Flame
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：171
• 期：Complete
• 页码：103-111
• 全文大小：1329 K

文摘

This paper reports the first set of measurements of the influence of simulated concentrated solar radiation (CSR) on the soot volume fraction and temperature in a laminar non-premixed ethylene flame. Broadband irradiation that closely approximates the solar spectrum was produced with a metal-halide lamp configured in a series of three optical concentrators to achieve fluxes of up to 0.45 MW/m² in a focused area of 80 mm in diameter. The radiation was used to irradiate an entire Santoro-type laminar flame of 64 mm in length, where the soot volume fraction and flame temperature were measured using planar laser-induced incandescence (LII) and two-line atomic fluorescence (TLAF), respectively. The results show that the simulated concentrated solar radiation significantly influences the evolution of soot on the fuel-rich side of the flame, but does not change either the visible length or width of the flame. It causes the soot volume fraction to increase by up to 50%, the soot inception to be translated upstream by 7% of the flame length, and the consumption rate of soot in the radial direction to increase by an average value of 54% for heights greater than 10 mm above the burner. The temperature of the flame was also found to increase by up to ∼100 K in most of the downstream locations.