Experimental study of the lifting characteristics of the leading-edge of an attached non-premixed jet-flame: Air-side or fuel-side dilution
作者： Manuel Marin , Françoise Baillot
DOI: 10.1016/J.COMBUSTFLAME.2016.05.025
关键词:
摘要: Abstract The impact of air-side and methane-side dilution (CO2, N2 Ar) on the lifting process attached non-premixed methane/air coaxial jet flames is studied over a wide range aerodynamic conditions. study competition between aerodynamics has allowed to discriminate quantify different phenomena involved in process. First, two effects, only dependent amount added diluent, contribute promoting flame detachment (liftoff): fluid mechanical effect that causes bulk velocity reactants increase; mixing changes mixture fraction spatial distribution. They are significant for but negligible dilution. Then, main mechanism dimensionless numbers characterizing liftoff identified. attached-flame stability analyzed basis limits measured by critical flow rate ratios, (Qd/Qf)lift (Qd/Qox)lift when diluent either methane or air stream. These follow self-similarity relationships based fuel oxidant Peclet diluted streams, satisfied whatever diluents. Results using PIV CH* measurements interpreted through flame-leading-edge approach, where CH4/air/diluent mixed locally at base. propagation SL which balances incoming gas velocity, shown be described molar leading-edge reduced values liftoff, X d / l i f t . To confirm characteristics, attachment height Ha radius Ra investigated representative mass effects induced pure Contrary Ra, piloted SL, evolves according unique law dictated self-similar parameter highlighting nature leading-edge.
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sci-hub.se 参考文章(56)
L. Vanquickenborne, A. van Tiggelen, The stabilization mechanism of lifted diffusion flames Combustion and Flame. ,vol. 10, pp. 59- 69 ,(1966) , 10.1016/0010-2180(66)90028-9
Masashi Katsuki, Toshiaki Hasegawa, The science and technology of combustion in highly preheated air Symposium (International) on Combustion. ,vol. 27, pp. 3135- 3146 ,(1998) , 10.1016/S0082-0784(98)80176-8
Fengshan Liu, Hongsheng Guo, Gregory J Smallwood, Ömer L Gülder, The chemical effects of carbon dioxide as an additive in an ethylene diffusion flame: implications for soot and NOx formation Combustion and Flame. ,vol. 125, pp. 778- 787 ,(2001) , 10.1016/S0010-2180(00)00241-8
Matthew Juniper, Sebastien Candel, Edge Diffusion Flame Stabilization Behind a Step over a Liquid Reactant Journal of Propulsion and Power. ,vol. 19, pp. 332- 341 ,(2003) , 10.2514/2.6134
Jeongjae Hwang, Nicolas Bouvet, Kitae Sohn, Youngbin Yoon, Stability characteristics of non-premixed turbulent jet flames of hydrogen and syngas blends with coaxial air International Journal of Hydrogen Energy. ,vol. 38, pp. 5139- 5149 ,(2013) , 10.1016/J.IJHYDENE.2013.01.182
Joan Boulanger, Luc Vervisch, Diffusion edge-flame: approximation of the flame tip Damköhler number Combustion and Flame. ,vol. 130, pp. 1- 14 ,(2002) , 10.1016/S0010-2180(02)00356-5
Aurélie Wyzgolik, Françoise Baillot, Response of the non-premixed lifted flame to coaxial jet mixing layers Proceedings of the Combustion Institute. ,vol. 31, pp. 1583- 1590 ,(2007) , 10.1016/J.PROCI.2006.07.214
Eduardo Fernández-Tarrazo, Marcos Vera, Amable Liñán, Liftoff and blowoff of a diffusion flame between parallel streams of fuel and air Combustion and Flame. ,vol. 144, pp. 261- 276 ,(2006) , 10.1016/J.COMBUSTFLAME.2005.07.012
Jiesheng Min, Françoise Baillot, Experimental investigation of the flame extinction processes of nonpremixed methane flames inside an air coflow diluted with CO2, N2, or Ar Combustion and Flame. ,vol. 159, pp. 3502- 3517 ,(2012) , 10.1016/J.COMBUSTFLAME.2012.05.015
Jiesheng Min, Françoise Baillot, Hongsheng Guo, Eric Domingues, Martine Talbaut, Béatrice Patte-Rouland, Impact of CO2, N2 or Ar diluted in air on the length and lifting behavior of a laminar diffusion flame Proceedings of the Combustion Institute. ,vol. 33, pp. 1071- 1078 ,(2011) , 10.1016/J.PROCI.2010.06.100