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Ignition delay and chemical–kinetic modeling of undiluted mixtures in a high‐pressure shock tube: Nonideal effects and comparative uncertainty analysis
International Journal of Chemical Kinetics ( IF 1.5 ) Pub Date : 2021-01-21 , DOI: 10.1002/kin.21469
Lisa Zander 1 , Johann Vinkeloe 1 , Neda Djordjevic 1
Affiliation  

High‐pressure shock tube ignition delay data are essential for fuel characterization and for the validation and optimization of chemical–kinetic models. Therefore, it is crucial that realistic measurement conditions are considered in modeling. Furthermore, an accurate uncertainty quantification for experimental data is the basis for evaluation of the predictive reliability of chemical–kinetic models. Several measurement aspects are investigated to improve the interpretation of measurement results: (1) A new approach for integrating the nonideal pressure rise into chemical–kinetic modeling based on a correlation to measurement data is introduced, which enables the determination at each condition and fuel–air mixture individually with minimal effort. (2) A semiempirical model for available test times of reactive mixtures is introduced, which is based on measurement data of nonreactive mixtures. It allows for a priori prediction of test times and provides experimental limits to support the measurement. (3) A literature review shows that different uncertainty sources are considered in ignition delay time uncertainty analysis. A comparative analysis is conducted to investigate the significance of different uncertainty sources for test temperature and ignition delay time. The analysis of ignition delay time uncertainty indicates that for fuels with negative temperature coefficient behavior a comprehensive uncertainty analysis has to be conducted to accurately estimate measurement uncertainty in the intermediate temperature range. Additionally, ignition delay times of dimethyl ether–air mixtures are measured at pressures of 8, 12, and 35 bar and at equivalence ratios of 0.5, 1.0, and 2.0. Furthermore, the data on first‐stage ignition delay are rather scarce and have therefore been recorded additionally. The new approach of integrating the nonideal pressure rise into modeling and the comprehensive uncertainty analysis supports the interpretation of measurement data, such that the prediction capabilities of chemical–kinetic models can be evaluated thoroughly.

中文翻译:

高压冲击管中未稀释混合物的点火延迟和化学动力学模型:非理想效应和比较不确定性分析

高压冲击管点火延迟数据对于燃料表征以及化学动力学模型的验证和优化至关重要。因此,在建模中考虑实际的测量条件至关重要。此外,对实验数据进行准确的不确定性量化是评估化学动力学模型的预测可靠性的基础。研究了几个测量方面,以改进对测量结果的解释:(1)引入了一种新方法,该方法将非理想压力升高结合到基于测量数据的相关性的化学动力学模型中,从而可以确定每种条件和燃料。空气混合物,耗费最小的力气。(2)引入了反应混合物的可用测试时间的半经验模型,基于非反应性混合物的测量数据。它允许对测试时间进行事前预测,并提供实验极限以支持测量。(3)文献综述表明,在点火延迟时间不确定性分析中考虑了不同的不确定性来源。进行了比较分析,以研究不同不确定性源对测试温度和点火延迟时间的重要性。点火延迟时间不确定性的分析表明,对于具有负温度系数特性的燃料,必须进行全面的不确定性分析以准确估计中间温度范围内的测量不确定性。此外,在8、12和35 bar的压力下以及当量比为0.5、1.0,和2.0。此外,有关第一阶段点火延迟的数据非常稀少,因此需要额外记录。将非理想压力上升融入建模和全面不确定性分析的新方法支持对测量数据的解释,从而可以对化学动力学模型的预测能力进行全面评估。
更新日期:2021-03-24
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