Abstract The heat flux method has been used widely for measuring the laminar burning velocity S L . However, compared with ideal S L definition of freely-propagating, stretch-less and adiabatic, the data obtained by the heat flux method is usually not perfectly freely-propagating due to the interaction between the flame and burner plate, which can affect the accuracy of the measurement. Though this issue has caught attention by some researchers, it hasn’t been evaluated extensively by experiments so far. To fill this gap, this study specially investigated four experimentally obtained factors: the measured burning velocity, the measurement sensitivity, the stand-off distance and the flame thickness. The experiments were carried out with methane + air flames at 1 atm and 298 K, equivalence ratio 0.7–1.5. By changing the burner plate temperature, the extent of flame and burner plate interaction can be well controlled. After series of assumption, deduction, and comparison with experiment results, a half-quantitative equation was proposed, and the burning velocity of stretch-less adiabatic freely-propagating flame was extrapolated from the non-freely propagating experiment results, which shows good agreement with literature data and simulation results. Besides, the uncertainty caused by not considering the flame and burner plate interaction was also evaluated.

中文翻译：

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用于层流燃烧速度测量的热通量法中火焰和燃烧器板相互作用的研究

摘要 热通量法已广泛用于测量层流燃烧速度SL 。然而，与自由传播、无拉伸和绝热的理想 SL 定义相比，由于火焰和燃烧器板之间的相互作用，热通量法获得的数据通常不是完全自由传播的，这会影响测量的准确性。测量。虽然这个问题已经引起了一些研究人员的注意，但到目前为止还没有通过实验进行广泛的评估。为了填补这一空白，本研究专门研究了四个实验获得的因素：测量的燃烧速度、测量灵敏度、距离和火焰厚度。实验使用甲烷 + 空气火焰在 1 个大气压和 298 K，当量比 0.7-1.5 下进行。通过改变燃烧板温度，火焰和燃烧器板相互作用的程度可以很好地控制。经过一系列的假设、推导和与实验结果的比较，提出了一个半定量方程，从非自由传播的实验结果中推断出无拉伸绝热自由传播火焰的燃烧速度，与文献数据和模拟结果。此外，还评估了因不考虑火焰和燃烧器板相互作用而导致的不确定性。与文献数据和模拟结果吻合良好。此外，还评估了因不考虑火焰和燃烧器板相互作用而导致的不确定性。与文献数据和模拟结果吻合良好。此外，还评估了因不考虑火焰和燃烧器板相互作用而导致的不确定性。