尾缘吹气式火焰稳定器时均流场

Experimental study on the mean flow behind EBMC flameholder

为了对尾缘吹气式火焰稳定器的流场进行研究,在低速风洞中利用二维在线式互相关PIV系统,对新型稳定器及V型稳定器的近尾迹流动进行了测量,考察了可控横向射流气动参数及射流方向对新型稳定器流场的影响。结果表明,尾缘吹气式火焰稳定器与V型火焰稳定器的流场特性基本相似,但吹气射流扩大了回流区,增加了回流率和湍流脉动速度;同时发现,射流与来流动量比是影响新型稳定器后流场的主要气动参数。

In order to study the flow fields behind the edge blowing mixture curtain (EBMC) flameholder, the detailed near-wake flow behind the EBMC flameholder and the V-gutter flameholder was measured by using 2D cross-correlation on-line PIV in a low speed wind tunnel. The effect of the dynamic parameters and the direction of the jet on the flowfield of the novel flameholder was also investigated. It was revealed that the time-averaged flow field of the EBMC flameholder was similar to that of the V-gutter flameholder, while the jet enlarged the recirculation zone and it increased the turbulence intensity and mass flow rate of the recirculation zone, which would benefit the combustion. It was also found that the momentum ratio of the jet to the main flow was a primary dynamic parameter that affected the flow field of the novel flameholder.