中国物理B ›› 2019, Vol. 28 ›› Issue (7): 74704-074704.doi: 10.1088/1674-1056/28/7/074704

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Effects of heat loss and viscosity friction at walls on flame acceleration and deflagration to detonation transition

Jin Huang(黄金), Wenhu Han(韩文虎), Xiangyu Gao(高向宇), Cheng Wang(王成)   

  1. 1 Beijing Priority Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;
    2 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2019-03-29 修回日期:2019-04-26 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Wenhu Han E-mail:hanwenhu@bit.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11732003 and 11521062) and the National Key Research and Development Program of China (Grant No. 2017YFC0804700).

Effects of heat loss and viscosity friction at walls on flame acceleration and deflagration to detonation transition

Jin Huang(黄金)1, Wenhu Han(韩文虎)2, Xiangyu Gao(高向宇)1, Cheng Wang(王成)2   

  1. 1 Beijing Priority Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;
    2 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
  • Received:2019-03-29 Revised:2019-04-26 Online:2019-07-05 Published:2019-07-05
  • Contact: Wenhu Han E-mail:hanwenhu@bit.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11732003 and 11521062) and the National Key Research and Development Program of China (Grant No. 2017YFC0804700).

摘要:

The coupled effect of wall heat loss and viscosity friction on flame propagation and deflagration to detonation transition (DDT) in micro-scale channel is investigated by high-resolution numerical simulations. The results show that when the heat loss at walls is considered, the oscillating flame presents a reciprocating motion of the flame front. The channel width and Boit number are varied to understand the effect of heat loss on the oscillating flame and DDT. It is found that the oscillating propagation is determined by the competition between wall heat loss and viscous friction. The flame retreat is led by the adverse pressure gradient caused by thermal contraction, while it is inhibited by the viscous effects of wall friction and flame boundary layer. The adverse pressure gradient formed in front of a flame, caused by the heat loss and thermal contraction, is the main reason for the flame retreat. Furthermore, the oscillating flame can develop to a detonation due to the pressure rise by thermal expansion and wall friction. The transition to detonation depends non-monotonically on the channel width.

关键词: micro-scale channel, heat loss, oscillating flame, deflagration to detonation transition (DDT)

Abstract:

The coupled effect of wall heat loss and viscosity friction on flame propagation and deflagration to detonation transition (DDT) in micro-scale channel is investigated by high-resolution numerical simulations. The results show that when the heat loss at walls is considered, the oscillating flame presents a reciprocating motion of the flame front. The channel width and Boit number are varied to understand the effect of heat loss on the oscillating flame and DDT. It is found that the oscillating propagation is determined by the competition between wall heat loss and viscous friction. The flame retreat is led by the adverse pressure gradient caused by thermal contraction, while it is inhibited by the viscous effects of wall friction and flame boundary layer. The adverse pressure gradient formed in front of a flame, caused by the heat loss and thermal contraction, is the main reason for the flame retreat. Furthermore, the oscillating flame can develop to a detonation due to the pressure rise by thermal expansion and wall friction. The transition to detonation depends non-monotonically on the channel width.

Key words: micro-scale channel, heat loss, oscillating flame, deflagration to detonation transition (DDT)

中图分类号:  (Flames; combustion)

  • 47.70.Pq
47.40.Rs (Detonation waves) 82.33.Vx (Reactions in flames, combustion, and explosions)