Uncertainty Quantification in Electronic State-Specific Modeling of High-Enthalpy Nitrogen Flows

What is it about?

Detailed internal energy state-to-state (StS) modeling is a promising approach for accurately describing the high-temperature thermochemical nonequilibrium phenomena typically encountered in hypersonic flows. However, the importance and uncertainty (which could significantly influence the accuracy of StS modeling) of the state-specific rate coefficients, especially at very high temperatures, are still not well studied. We perform an uncertainty quantification analysis for the StS modeling of nitrogen flows behind a high-speed normal shock and identify the eight most relevant state-specific reactions that deserve further optimization to improve their accuracy by detailed high-fidelity first-principle calculations or experiments. The high-accuracy rate coefficients of these reactions are crucial for bridging the gap between predictions and high-enthalpy shock-tube experiments.

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