Ignition characteristics of premixed cool flames on a heated wall

Minhyeok Lee; Yong Fan; Yiguang JuYuji Suzuki

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Ignition characteristics of premixed cool flames on a heated wall

机译：Ignition characteristics of premixed cool flames on a heated wall

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This work examined the cool flame ignition and stabilization on heated walls with different surface reactivities.A premixed mixture of dimethyl ether (DME) and O 2 was impinged on a heated wall and thewall temperature was linearly ramped to determine the cool flame ignition temperature. Numerical analysesidentify a hysteresis phenomenon in the cool flame ignition and extinction processes, which appearsto be primarily governed by the low-temperature reaction kinetics. The formation of HCHO during thecool flame ignition process was monitored using the planar laser-induced fluorescence (PLIF) techniquesynchronized with instantaneous wall temperature measurements. The data indicated that the HCHO concentrationnear the wall surface abruptly increased at the ignition of the premixed cool flame. The predictedhysteresis behaviors for cool flame ignition and extinction with a nonlinear folded S -curve anda smoothly stretched S -curve were successfully observed experimentally for the first time ever for leanmixtures. Moreover, the results show that compared with the ignition limits on an inert SiO_2 surface,noticeable increases and decreases of the cool flame ignition temperature were observed on Fe and Ptsurfaces, respectively. These findings suggest that significant wall chemical effects occur during the coolflame ignition process, based on interactions between the gas phase and surface reactions.

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来源
《Combustion and Flame》 |2021年第9期|111476.1-111476.8|共8页
作者
Minhyeok Lee; Yong Fan; Yiguang JuYuji Suzuki;
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作者单位

Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;

Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan,Department of Energy Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564;

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类
关键词
Cool flame ignition; Dimethyl ether; HCHO-PLIF; S -curve; Wall chemical effect;

Ignition characteristics of premixed cool flames on a heated wall

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