A comparative study on premixed hydrogen-air and propane-air flame propagations with tulip distortion in a closed duct

被引：46
|
作者：
Shen, Xiaobo [1 ]
He, Xuechao [2 ]
Sun, Jinhua [3 ]
机构：
[1] E China Univ Sci & Technol, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China
[2] Minist Publ Secur, Sichuan Fire Res Inst, Chengdu 610036, Peoples R China
[3] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Peoples R China
来源：
FUEL | 2015年 / 161卷
基金：
中国国家自然科学基金;
关键词：
Distorted tulip shape; Flame tip velocity; Pressure; Oscillation; Schlieren; 90-DEGREES BEND; TUBES; ACCELERATION; INSTABILITY; DYNAMICS; SHAPE; DETONATION; COMBUSTION; BEHAVIOR; NONSLIP;
D O I：
10.1016/j.fuel.2015.08.043
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The premixed hydrogen-air and propane-air flames in a closed duct were experimentally studied for a deep insight into the tulip distortion phenomenon. High speed schlieren photography and pressure sensors recorded the flame images and pressure dynamics at different equivalence ratios for detailed analyses and comparisons. The distorted tulip shape which was first scrutinized and distinguished as an exclusive feature in premixed hydrogen-air flame, was also observed in stoichiometric premixed propane-air flame with a similar behavior on flame shape changes. Tulip distortions are always accompanied by remarkable flame tip velocity fluctuations with near-constant amplitudes. But the pressure dynamics is totally different. There are no observable oscillation and stepped rise in pressure trajectory of stoichiometric premixed propane-air flame. The pressure wave effect is definitely not the incitation factor, but an additional enhancement of flame acceleration, deceleration and deformation. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：248 / 253
页数：6
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