Evolution of premixed stoichiometric hydrogen/air flame in a closed duct
Evolution of premixed stoichiometric hydrogen/air flame in a closed duct
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封闭管道中预混合化学计量氢气/空气火焰的演变
DOI：
10.1016/j.energy.2019.03.193
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发表时间：
2019-06
期刊：
影响因子：
9
通讯作者：
Zhu Hongya
中科院分区：
文献类型：
--
作者：
Shen Xiaobo;Zhang Chao;Xiu Guangli;Zhu Hongya
在一个狭窄的管道中进行了实验，考察了不同初始压力下预混化学计量比氢/空气火焰传播的演化。除了经典的郁金香火焰的形成外，利用高速纹影照相术还观察到了新的火焰变形阶段，例如拉长的郁金香火焰和T形火焰。随着初始压力的减小，火焰传播趋于温和，但经典的郁金香形状在所有条件下都具有健壮的外观。将测得的火焰变形特征时间与Bychkov模型的预测值进行了比较。火焰壁接触初期产生的压力波不会触发经典的郁金香反转，但在端壁反射后，会与修改郁金香结构的火焰锋面发生碰撞。此后，根据初始压力的不同，启动了三种不同类型的压力动态：P0≥0.7atm、0.5≤P0<；0.7atm或P0<；0.5atm。瑞利-泰勒不稳定性是导致火焰变形的主要原因，根据线性理论，火焰变形的幅度增长率ω是周期性的，主要由火焰加速度g决定。传感器测量的压力动态是燃烧过程中产生的火焰动力学、火焰诱导流动和压力波的综合表现。
Experiments were performed in a narrow duct to scrutinize the evolution of premixed stoichiometric hydrogen/air flame propagation at varied initial pressures. Besides the formation of the classic tulip flame, new stages of flame deformation have been observed using high speed Schlieren photography, eg elongated tulip flame and T-shape flame. With decreasing initial pressure, the flame propagation tends to be milder, but the classic tulip shape is of robust appearance at all conditions. The measured characteristic times of flame deformation were compared with the predictions of Bychkov's model. The pressure wave generated upon the flame-wall contact at very early stage does not trigger the classic tulip inversion, but will collide with the flame front modifying the tulip structure after reflection on the end wall. Thereafter, three different types of pressure dynamics are initiated depending on the initial pressure, P 0≥ 0.7 atm, 0.5≤ P 0< 0.7 atm, or P 0< 0.5 atm. The Rayleigh–Taylor instability primarily accounts for the flame deformation, whose amplitude growth rate, ω is periodic and determined mainly by the flame acceleration, g according to the linear theory. The measured pressure dynamics by sensor is a combined manifestation originating from the flame dynamics, flame-induced flow and pressure waves excited during combustion.
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影响因子：
3
作者：
RICHTMYER, RD
通讯作者：
RICHTMYER, RD
影响因子：
5.7
作者：
Fushui Liu;Xiaoyu Zhang;Yikai Li;Han Wu;Yang Hua
通讯作者：
Fushui Liu;Xiaoyu Zhang;Yikai Li;Han Wu;Yang Hua
影响因子：
4.4
作者：
Stéphane Boulal;P. Vidal;R. Zitoun;Takuya Matsumoto;A. Matsuo
通讯作者：
Stéphane Boulal;P. Vidal;R. Zitoun;Takuya Matsumoto;A. Matsuo
影响因子：
4.4
作者：
Gonzalez, M
通讯作者：
Gonzalez, M
影响因子：
2.4
作者：
Dunn-Rankin, D;Sawyer, RF
通讯作者：
Sawyer, RF