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Implications of real-gas behavior on refractive index calculations for optical diagnostics of fuel-air mixing at high pressures

机译：实际气体行为对高压下燃料 - 空气混合光学诊断折射率计算的影响

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摘要

Three models to compute the refractive index of gaseous mixtures at real gas conditions are presented with the purpose to improve the accuracy of state relationships between refractive index and thermodynamic properties. Models are compared with experimental data to determine one that is applicable to high pressure mixtures with non-ideal thermodynamic behavior near or above a fluids' critical point. The optimal model is applied to analyze adiabatic thermal mixing of fuel and air at typical diesel engine conditions. Results show that the ideal gas mixture law is appropriate in the vapor region, assuming it is known, for example, from experimental measurements. Finally, the model is applied for binary fuel-air mixing at supercritical conditions to demonstrate its full potential. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：提出了在实际气体条件下计算气态混合物折射率的三种模型，目的是提高折射率与热力学性能之间的状态关系的准确性。模型与实验数据进行比较，以确定适用于高压混合物的高压力混合物，其在流体临界点附近或高于流体的临界点。应用最佳模型来分析典型柴油发动机条件下燃料和空气的绝热热混合。结果表明，理想的气体混合物定律适用于蒸汽区，假设是从实验测量中已知的。最后，该模型用于超临界条件下的二元燃料空气混合，以证明其全部潜力。 （c）2019燃烧研究所。由elsevier Inc.出版的所有权利保留。

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