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首页> 外文期刊>Combustion Science and Technology >ON THE RATIONAL INTERPRETATION OF DATA ON LAMINAR FLAME SPEEDS AND IGNITION DELAY TIMES
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ON THE RATIONAL INTERPRETATION OF DATA ON LAMINAR FLAME SPEEDS AND IGNITION DELAY TIMES

机译：层流火焰数据的合理解释和点火延迟时间

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This article examines a seemingly trivial issue, namely, the apparently large scatter found for the laminar flame speeds of fuel-rich mixtures as compared to those of lean mixtures. Using the hydrogen/air flame speed at atmospheric pressure as an example, it is demonstrated that this perceptive notion is based on rather uninformed data presentation. It is shown that the cause for the notion has little to do with the data itself, but it is the result that the flame speed data are customarily plotted against the equivalence ratio, which by its asymmetric definition, compresses the data for lean mixtures and expands the data for rich ones. When plotting the flame speed against the symmetrized equivalence ratio defined as (phi) over bar = phi/(1 + phi), it can be readily shown that the flame speed data have, in fact, similar uncertainties across the entire range of stoichiometric mixtures tested thus far. A statistical analysis of an extensive set of flame speed data further illustrates the above point, namely, a nearly invariant confidence interval across the same range of stoichiometry. The aforementioned result, coupled with a similar statistical analysis performed for a representative set of shock-tube ignition delay time, highlights the importance of the systematic treatment of the uncertainty in these global, yet fundamental combustion property measurements in aiding reaction model development and testing. For this purpose, an impact factor is proposed for combustion experiments, by combining the sensitivity of the response to rate parameters with the inherent uncertainty of the experiment. It is demonstrated that with the exception of some extreme cases, the impact factors of the flame speed and shock tube ignition delay data are quite close to each other, making both indispensable for model testing. Overall the study illustrates that as a quantitative science, fundamental combustion property measurements must consider inherent experimental uncertainty and require a careful analysis of the uncertainty in order to yield useful results.
机译：本文研究了一个看似微不足道的问题，即与贫油混合物相比，富油混合物的层流火焰速度明显较大。以大气压下的氢气/空气火焰速度为例，证明了这种感知概念是基于相当不知情的数据表示。结果表明，产生这种现象的原因与数据本身无关，但结果是通常将火焰速度数据与当量比作图，以其不对称定义压缩了稀薄混合物的数据并扩展了丰富的数据。将火焰速度与定义为（phi）的对称当量比的关系绘制为bar = phi /（1 + phi）时，可以很容易地证明，火焰速度数据实际上在整个化学计量混合物范围内具有相似的不确定性到目前为止测试。对大量火焰速度数据的统计分析进一步说明了上述观点，即在相同化学计量范围内几乎不变的置信区间。前面提到的结果，加上对一组代表性的冲击管点火延迟时间进行的类似统计分析，凸显了系统处理这些全局但基本的燃烧特性测量结果中的不确定性对于协助反应模型开发和测试的重要性。为此，通过将对速率参数的响应的敏感性与实验的固有不确定性相结合，提出了用于燃烧实验的影响因子。结果表明，除了一些极端情况外，火焰速度和冲击管点火延迟数据的影响因素彼此之间非常接近，这两者对于模型测试都是必不可少的。总体而言，该研究表明，作为定量科学，基本燃烧性能测量必须考虑固有的实验不确定性，并且需要对不确定性进行仔细分析，以得出有用的结果。

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