Calculation of the Minimum Ignition Energy based on the ignition delay time

TL;DR

This paper introduces a novel model to calculate the Minimum Ignition Energy (MIE) using ignition delay time, validated against DNS results, and explores how ignition source dimensionality affects MIE.

Contribution

A new zero-dimensional heat diffusion model incorporating ignition delay time for calculating MIE, validated with DNS and analyzing source dimensionality effects.

Findings

Model accurately reproduces DNS results for hydrogen mixtures.

Ignition source dimensionality significantly influences MIE.

Three different ignition kernel geometries show varying effects on ignition energy.

Abstract

The Minimum Ignition Energy (MIE) of an initially Gaussian temperature profile is found both by Direct Numerical Simulations (DNS) and from a new novel model. The model is based on solving the heat diffusion equation in zero dimensions for a Gaussian velocity distribution. The chemistry is taken into account through the ignition delay time, which is required as input to the model. The model results reproduce the DNS results very well for the Hydrogen mixture investigated. Furthermore, the effect of ignition source dimensionality is explored, and it is shown that for compact ignition kernels there is a strong effect on dimensionality. Here, three, two and one dimensional ignition sources represent a spherical kernel, a long spark and an ignition sheet, respectively.