Piloted ignition of solid fuels at low ambient pressure and varying igniter location

被引:10
作者
Dai Jiakun [1 ,2 ]
Delichatsios, Michael A. [2 ]
Yang Lizhong [1 ]
机构
[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230027, Anhui, Peoples R China
[2] Univ Ulster, Jordanstown Sch Built Environm, FireSERT, Belfast BT37 0QB, Antrim, North Ireland
基金
中国国家自然科学基金;
关键词
Piloted ignition; Ignition mass flux; Pressure; Igniter location;
D O I
10.1016/j.proci.2012.05.072
中图分类号
O414.1 [热力学];
学科分类号
摘要
In order to investigate the effects of ambient pressure and igniter location on piloted ignition of solid fuels, the ignition mass flux of PMMA was experimentally determined for locations of the igniter between 6 and 70 mm above the solid surface, under two external heat fluxes of 21.2 and 25.4 kW/m(2). The experimental results show that the ignition mass flux decreases as the igniter approached the solid surface until it reached a minimum, and then the ignition mass flux remains nearly constant followed by a slight increase with a further decrease of the igniter location. In addition, in another series of experiments the ignition mass flux for elm wood decreases by a factor 0.6 at reduced pressure 0.67 (Tibet 0.67 atm) compared to the ignition mass flux at normal pressure (Hefei, 1.0 atm). The results of this work are explained well by a numerical piloted ignition model which also explains recent observations on the ignition mass flux at reduced pressures in a forced-flow ignition and flame spread apparatus. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:2497 / 2503
页数:7
相关论文
共 11 条
[1]   Glowing ignition of wood: the onset of surface combustion [J].
Boonmee, N ;
Quintiere, JG .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2005, 30 :2303-2310
[2]  
Dai J.K., 2012, 34 INT S CO IN PRESS
[3]   Surface extinction of flames on solids: Some interesting results [J].
Delichatsios, M. A. .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2007, 31 (2749-2756) :2749-2756
[4]  
Delichatsios MM, 1997, FIR SAF SCI P 5 INT, V5, P153, DOI 10.3801/IAFSS.FSS.5-153
[5]   Mass flux at ignition in reduced pressure environments [J].
Fereres, Sonia ;
Lautenberger, Chris ;
Fernandez-Pello, Carlos ;
Urban, David ;
Ruff, Gary .
COMBUSTION AND FLAME, 2011, 158 (07) :1301-1306
[6]   The combined effect of pressure and oxygen concentration on piloted ignition of a solid combustible [J].
McAllister, Sara ;
Fernandez-Pello, Carlos ;
Urban, David ;
Ruff, Gary .
COMBUSTION AND FLAME, 2010, 157 (09) :1753-1759
[7]   Piloted ignition delay of PMMA in space exploration atmospheres [J].
McAllister, Sara ;
Fernandez-Pello, Carlos ;
Urban, David ;
Ruff, Gary .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2009, 32 :2453-2459
[8]   Mass flux of combustible solids at piloted ignition [J].
Rich, David ;
Lautenberger, Chris ;
Torero, Jose L. ;
Quintiere, James G. ;
Fernandez-Pello, Carlos .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2007, 31 :2653-2660
[9]   LIMITING CONDITION FOR BURNING OF FLAMMABLE LIQUIDS [J].
ROBERTS, AF ;
QUINCE, BW .
COMBUSTION AND FLAME, 1973, 20 (02) :245-251
[10]  
Tewarson A., 1981, Symposium (Internation) on Combustion, V18, P563