Effects of spatial distribution of CO2 dilution on localised forced ignition of stoichiometric biogas-air mixtures

Papapostolou, VS; Brearley, Peter; d’Auzay, Charles Turquand; Chakraborty, Nilanjan

doi:10.1080/00102202.2021.1975688

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“…Pera et al 15 demonstrated that mixture homogeneity induced by residual burnt gas has a significant influence on early flame propagation and cyclic variability in the case of forced ignition. The analysis of the forced ignition of homogeneous and inhomogeneous partially-premixed biogas mixtures using DNS data by the present authors, 16,17,12,18,19 building upon previous work by Chakraborty and co-workers on methane/air mixtures, [20][21][22][23][24][25][26] confirmed the experimental findings of the effects of CO 2 concentration in the fuel blend on the MIE, kernel growth and ignition success. However, these studies considered homogeneous decaying turbulence such that the understanding of CO 2 concentration in the fuel blend on the forced ignition, kernel development and subsequent transition to self-sustained propagating or stabilised flame in shear-generated turbulence and inhomogeneous mixtures that leads to the co-existence of numerous flame regimes has received relatively limited attention.…”

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confidence: 85%

A direct numerical simulation analysis of localised forced ignition in turbulent slot jets of CH4/CO2 blends

d’Auzay

Chakraborty

2023

International Journal of Spray and Combustion Dynamics

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The early stages of flame evolution following successful localised forced ignition of different CH[Formula: see text]/CO[Formula: see text] blends in a slot jet configuration have been analysed using three-dimensional direct numerical simulations. The simulations have been conducted for three different concentration levels of CO[Formula: see text] in the fuel blend composed of CH[Formula: see text] and CO[Formula: see text] (ranging from 0% to 20% by volume). The effects of CO[Formula: see text] concentration have been analysed based on five different energy deposition scenarios which include situations where the mean mixture composition at the ignitor varies, but not its location in space, whereas other cases represent the scenarios where the mean mixture composition within the energy deposition region remains constant, but its spatial location changes with CO[Formula: see text] concentration. The most favourable region for successful flame development following thermal runaway, from the mixture composition standpoint (i.e. the highest flammability factor), has been found to be displaced close to the nozzle with an increase in CO[Formula: see text] concentration. The flame development following thermal runaway exhibits initial growth of hot gas kernel followed by downstream advection and eventual flame propagation along with radial expansion with a possibility of flame stabilisation irrespective of the level of CO[Formula: see text] concentration. The triple flame propagation has been found to play a key role in the upstream flame propagation and eventual stabilisation. The orientation of the local flame normal plays a key role in the flame stabilisation. The lift off height has been found to increase with increasing CO[Formula: see text] concentration which also adversely affect flame stabilisation for high levels of CO[Formula: see text] concentration.

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