文献类型：期刊文献

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

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

年份：2015

卷号：161

起止页码：248

外文期刊名：FUEL

收录：;EI(收录号：20153701263631);WOS:【SCI-EXPANDED(收录号:WOS:000362304600030)】；

基金：This work is funded by National Natural Science Foundation of China (No. 51376174), the Fundamental Research Funds for the Central Universities (No. 22A201514059) and State Key Laboratory of Fire Science (No. HZ2015-KF12). The authors gratefully thank these supports.

语种：英文

外文关键词：Distorted tulip shape; Flame tip velocity; Pressure; Oscillation; Schlieren

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.