Experimental n-Hexane-Air Expanding Spherical Flames

TL;DR

This study experimentally and numerically investigates how initial pressure and temperature affect the laminar burning speed of n-hexane-air mixtures, highlighting the accuracy of the JetSurF model.

Contribution

It provides new experimental data on n-hexane-air flames under various conditions and compares reaction models, identifying JetSurF as the most accurate for predictions.

Findings

Laminar burning speed increases with temperature and decreases with pressure.

JetSurF model best predicts laminar flame properties of n-hexane-air mixtures.

Experimental data supports model validation across different conditions.

Abstract

The effects of initial pressure and temperature on the laminar burning speed of n-hexane-air mixtures were investigated experimentally and numerically. The spherically expanding flame technique with a nonlinear extrapolation procedure was employed to measure the laminar burning speed at atmospheric and sub-atmospheric pressures and at nominal temperatures ranging from 296 to 422 K. The results indicated that the laminar burning speed increases as pressure decreases and as temperature increases. The predictions of three reaction models taken from the literature were compared with the experimental results from the present study and previous data for n-hexane-air mixtures. Based on a quantitative analysis of the model performances, it was found that the most appropriate model to use for predicting laminar flame properties of n-hexane-air mixtures is JetSurF.