Simultaneous particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) utilizing R-branch transitions in the C-X (0,0) band were performed at a 10-kHz repetition-rate in a turbulent premixed flame. The CH lines at 310.690 nm (from the R-branch of the C-X band) used here have greater efficiency than A-X and B-X transitions, which allows for high-framerate imaging with low laser pulse energy. Most importantly, the simultaneous imaging of both CH PLIF and PIV is enabled by the use of a custom edge filter, which blocks scattering at the laser wavelength (below ∼311 nm) while efficiently transmitting fluorescence at longer wavelengths. The Hi-Pilot Bunsen burner operated with a turbulent Reynolds number of 7900 was used to demonstrate simultaneous PIV and CH PLIF utilizing this filtered detection scheme. Instances where pockets of products were observed well upstream of the mean flame brush are found to be the result of out-of-plane motion of the flame sheet. Such instances can lead to ambiguous results when interpreting the thickness of reaction layers. However, the temporally resolved nature of the present diagnostics facilitate the identification and proper treatment of such situations. The strategy demonstrated here can yield important information in the study of turbulent flames by providing temporally resolved flame dynamics in terms of flame sheet visualization and velocity fields.

在湍流预混火焰中，以10 kHz重复频率执行同时粒子图像测速（PIV）和利用CX（0,0）波段R分支跃迁的平面激光诱导荧光（PLIF）。此处使用的310.690 nm处的CH线（来自CX波段的R分支）比AX和BX跃迁具有更高的效率，这允许以低激光脉冲能量进行高帧率成像。最重要的是，CH PLIF和PIV的同时成像是通过使用定制的边缘滤镜实现的，该滤镜可阻挡激光波长（约311 nm以下）的散射，同时有效地透射较长波长的荧光。使用湍流雷诺数为7900的Hi-Pilot Bunsen燃烧器来演示利用此过滤后的检测方案同时进行PIV和CH PLIF。发现在平均火焰刷上游很远的地方观察到产品袋的情况是由于火焰片的平面外运动引起的。当解释反应层的厚度时，这样的情况可能导致模棱两可的结果。然而，本诊断的时间分辨性质有利于这种情况的识别和适当治疗。此处展示的策略可以通过在火焰表可视化和速度场方面提供时间分辨的火焰动力学，从而在湍流火焰研究中提供重要的信息。本诊断的时间分辨性质有利于这种情况的识别和适当治疗。此处展示的策略可以通过在火焰表可视化和速度场方面提供时间分辨的火焰动力学，从而在湍流火焰研究中提供重要的信息。本诊断的时间分辨性质有利于这种情况的识别和适当治疗。此处展示的策略可以通过在火焰表可视化和速度场方面提供时间分辨的火焰动力学，从而在湍流火焰研究中提供重要的信息。