This paper presents a systematic experimental study of the relative contributions of various near-wall flame dynamics to exhaust CO emissions. Exhaust carbon monoxide (CO) emissions and quenching distance measurements are reported for a laminar forced premixed propane flame undergoing flame-wall interaction. A vehicle-certification grade emissions bench was used to measure exhaust CO emissions at two points in the exhaust, one close to the flame and one far downstream of the flame. Flame chemiluminescence images were analysed to determine the quenching distance at 16 points in the forcing cycle. Four frequencies ($f=5,20,35$ and 60 Hz), three amplitudes ($|u^{\prime }/\overline{u}|=0.02,0.05$ and 0.15), and two cooling rates (${\dot{Q}}_c\approx 160$ and 240 W), are compared to the unforced case. Higher forcing frequencies are observed to significantly change the flame shape during the forcing cycle. Increasing frequency is found to have a non-monotonic effect on the quenching distance, while increasing amplitude is found to decrease the mean quenching distance. Increasing the cooling rate is found to further decrease the mean quenching distance, which is in agreement with the literature. Exhaust CO measurements close to the flame reveal a small decrease at the higher cooling rate, while amplitude and frequency both had an order of magnitude less impact. Far downstream of the flame, exhaust CO measurements show that all cases converge to low CO concentrations. It is shown that a simple reactor network simulation reasonably predicts the exhaust CO emissions, far downstream of the flame.

本文对各种近壁火焰动力学对尾气CO排放的相对贡献进行了系统的实验研究。报告了层流强制预混丙烷火焰经历壁-壁相互作用的尾气一氧化碳（CO）排放量和猝灭距离测量值。使用了汽车认证等级的排放工作台来测量排气中两个点的废气CO排放，其中一个点靠近火焰，而另一个点远离火焰。分析火焰化学发光图像以确定在强制循环中16个点的淬灭距离。四个频率（$F=5，20，35$ 和60 Hz），三个幅度（$|{ü}^{\prime }/\overline{ü}|=0.02，0.05$ 和0.15），以及两个冷却速率（${\dot{问}}_C\approx 160$和240 W）与非强制情况进行比较。观察到较高的强迫频率会在强迫循环中显着改变火焰形状。发现增加频率对淬灭距离具有非单调影响，而发现增加振幅则减小平均淬灭距离。发现增加冷却速率会进一步减小平均淬火距离，这与文献一致。靠近火焰的排气CO测量值表明，较高的冷却速率下有少量降低，而幅度和频率的影响都小一个数量级。在火焰的下游，排气中的CO测量值表明所有情况都收敛到低的CO浓度。结果表明，简单的反应器网络模拟可以合理地预测火焰下游的废气CO排放量。