Spherical flame initiation and propagation with thermally sensitive intermediate kinetics
Spherical flame initiation and propagation with thermally sensitive intermediate kinetics
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具有热敏中间动力学的球形火焰引发和传播
DOI：
10.1016/j.combustflame.2010.12.031
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发表时间：
2011-08
影响因子：
4.4
通讯作者：
Chen, Zheng
中科院分区：
文献类型：
--
作者：
Zhang, Huangwei;Chen, Zheng
在大活化能和准稳态假设的框架下，对具有热敏中间动力学的球形火焰起爆和传播进行了分析研究。导出了描述点火核、火焰球、传播球形火焰和平面火焰之间不同火焰状态和过渡的关系式。在此基础上，研究了球形火焰的传播和起爆。发现火焰的传播速度、马克斯坦长度、临界点火功率和半径与燃料和自由基的路易斯数以及反应热有很大的关系。对于球形火焰传播，轨迹随燃料刘易斯数的变化变化明显，大燃料刘易斯数下火焰传播速度随火焰半径的变化呈c型解曲线。马克斯坦长度随燃料/自由基路易斯数单调增加/减少。拉伸对火焰传播的影响（即马克氏长度绝对值）随着反应热的增加而减小。对于球形起爆，临界点火功率和临界点火半径随燃料路易斯数的增大而增大，随自由基路易斯数和反应热的增大而减小。观察并讨论了三种不同的起燃机制。通过热膨胀和精细化学等瞬态数值模拟，验证了理论预测的有效性。
Spherical flame initiation and propagation with thermally sensitive intermediate kinetics are studied analytically within the framework of large activation energy and quasi-steady assumptions. A correlation describing different flame regimes and transitions among the ignition kernels, flame balls, propagating spherical flames, and planar flames is derived. Based on this correlation, spherical flame propagation and initiation are then investigated. The flame propagation speed, Markstein length, and critical ignition power and radius are found to strongly depend on the Lewis numbers of fuel and radical and the heat of reaction. For spherical flame propagation, the trajectory is shown to change significantly with the fuel Lewis number and a C-shaped solution curve of flame propagation speed as a function of flame radius is observed for large fuel Lewis numbers. The Markstein length is shown to increase/decrease monotonically with the fuel/radical Lewis number. The influence of stretch on flame propagation (i.e. the absolute value of Markstein length) is found to decrease with the heat of reaction. For spherical flame initiation, the critical ignition power and radius are shown to increase with the fuel Lewis number and to decrease with the radical Lewis number and heat of reaction. Three different flame initiation regimes are observed and discussed. Furthermore, the validity of theoretical prediction is confirmed by transient numerical simulations including thermal expansion and detailed chemistry.
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影响因子：
1.3
作者：
J. Dold;R O Weber;R W Thatcher;A. Shah;W. Weber;R. W. Thatcher;Shah
通讯作者：
J. Dold;R O Weber;R W Thatcher;A. Shah;W. Weber;R. W. Thatcher;Shah
影响因子：
7.2
作者：
Zheng Chen
通讯作者：
Zheng Chen
影响因子：
4.4
作者：
C. Sung;A. Makino;C. Law
通讯作者：
C. Sung;A. Makino;C. Law
影响因子：
1.9
作者：
D. Mikolaitis
通讯作者：
D. Mikolaitis
影响因子：
3.7
作者：
M. Matalon;C. Cui;J. Bechtold
通讯作者：
M. Matalon;C. Cui;J. Bechtold