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Effects of heat loss and viscosity friction at walls on flame acceleration and deflagration to detonation transition
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作者 Jin Huang Wenhu Han +1 位作者 Xiangyu Gao Cheng Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期312-318,共7页
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 resul... 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. 展开更多
关键词 MICRO-SCALE channel heat loss OSCILLATING flame DEFLAGRATION to DETONATION transition(DDT)
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Effect of Cellular Instability on the Initiation of Cylindrical Detonations
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作者 韩文虎 黄金 +3 位作者 杜宁 刘再刚 孔文俊 王成 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第5期76-79,共4页
The direct initiation of detonations in one-dimensional (1D) and two-dimensional (2D) cylindrical geometries is investigated through numerical simulations. In comparison of 1D and 2D simulations, it is found that ... The direct initiation of detonations in one-dimensional (1D) and two-dimensional (2D) cylindrical geometries is investigated through numerical simulations. In comparison of 1D and 2D simulations, it is found that cellular instability has a negative effect on the 2D initiation and makes it more difficult to initiate a sustaining 2D cylindrical detonation. This effect associates closely with the activation energy. For the lower activation energy, the 2D initiation of cylindrical detonations can be achieved through a subcritical initiation way. With increasing the activation energy, the 2D cylindrical detonation has increased difficulty in its initiation due to the presence of unreacted pockets behind the detonation front and usually requires rather larger source energy. 展开更多
关键词 Effect of Cellular Instability on the Initiation of Cylindrical Detonations
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