火焰稳定器稳焰机理的非定常观点探讨

本文在低速风洞中 ,利用在线式互相关 PIV ( Particle Image Velocimetry)系统 ,对尾缘吹气式火焰稳定器及 V型火焰稳定器的近尾迹流动进行了测量 ,在瞬态场尾流结构分析的基础上 ,提出了稳焰机理的非定常观点 ,探讨了近尾迹流动结构中旋涡的交替生成和脱落在火焰稳定过程中起了重要的作用。

Discussion on the Instantaneous Viewpoint About the Flame Stability Mechanism of Flameholder

The detailed near-wake flow behind the EBMC flameholder and V-gutter flameholder was measured by using 2D cross-correlation on-line PIV in a low speed wind tunnel.On the basis of the research on the instantaneous flow,the instantaneous viewpoint about the flame stability mechanism is put forward.Alternative formation and shedding of vortices in the near-wake flow structure have important effect on the flame stability.Large scale vortex provides essential condition for flame spreading as ignition source.And it transfers the energy and radicals to the forming vortex which becomes the ignition source as its development.So the source is handed on with the alternative formation and shedding of vortices.The larger is the scale of vortices and the more stable are the vortices, the better is the flame stability.