Statistical Study of the Deviations in Ignition Delay Time Estimations for H2/CH4 Fuel Mixtures using Commercial and Open-Source Code
Abstract
An adequate ignition delay time prediction is one of the most important study fields in combustion engineering. In this way, the aim of this study was to evaluate the possible deviations that an open-source program such as Cantera may present with respect to the results delivered by a commercial application, in this case, CHEMKIN 19.0. The methodology used in the work was based on the comparison of means with respect to a fixed value and the analysis of variance (ANOVA), considering a complete factorial experimental design of the 2k type. A variable transformation on the relative differences was applied in order to achieve the normal distribution condition. The obtained results establish that disagreement exists from a statistical point of view, although negligible for a practical and engineering focus. In conclusion, a confidence interval and superior threshold could be established for the differences with a 95 % confidence. The sixth root of the relative differences is lower for 0.8 and it is into the 0.67 and 0.71 interval, confirming that the deviations are irrelevant since the relative differences are even less.
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