A high-speed chemiluminescence imaging diagnostic system has been developed and characterized for measuring species-specific properties of spherically expanding flames, with the objective of obtaining synchronized measurements of multiple flame properties from a single flame experiment. The imaging system comprises a high-speed camera coupled to a high-speed image intensifier and optical filters to isolate emission from desired excited species. This study validates the diagnostic scheme specifically for measuring laminar flame speed and Markstein length from chemiluminescence at three wavelength bands corresponding to OH*, CH*, and total chemiluminescence, respectively. Mixtures of methane-air and methane/ethane-air were tested at initial conditions of atmospheric pressure and room temperature. An under-utilized methodology for computing unburned Markstein length from burned Markstein length was implemented. Flame speed modeling of each mixture was conducted in Chemkin using AramcoMech 2.0. No significant differences were observed between the results derived from the three emission wavelength bands for the flame speeds nor the Markstein lengths. For both of these properties, excellent agreement was observed between the experimental results and the values reported in the literature. Because laminar flame speed and Markstein length show no dependency on the imaging wavelength, the present results imply that multiple flame properties, such as laminar flame speed, Markstein length, flame thickness, and excited-species intensity profiles, can all be acquired simultaneously for the same flame using this method.

一种高速化学发光成像诊断系统已被开发和表征，用于测量球形膨胀火焰的物种特异性特性，目的是从单个火焰实验中获得多个火焰特性的同步测量结果。该成像系统包括一个与高速图像增强器和滤光器耦合的高速相机，以隔离来自所需激发物质的发射。本研究验证了专门用于测量层流火焰速度和 Markstein 长度的诊断方案，该方案分别来自对应于 OH*、CH* 和总化学发光的三个波段的化学发光。在大气压力和室温的初始条件下测试甲烷-空气和甲烷/乙烷-空气的混合物。实施了一种未充分利用的方法，用于从燃烧的 Markstein 长度计算未燃烧的 Markstein 长度。使用 AramcoMech 2.0 在 Chemkin 中对每种混合物进行火焰速度建模。在火焰速度和 Markstein 长度的三个发射波长带得出的结果之间没有观察到显着差异。对于这两种特性，在实验结果和文献报道的值之间观察到了极好的一致性。由于层流火焰速度和 Markstein 长度不依赖于成像波长，因此目前的结果意味着多种火焰属性，如层流火焰速度、Markstein 长度、火焰厚度和激发物种强度分布，都可以同时获得使用此方法相同的火焰。