Coal particle volatile combustion and flame interaction. Part II: Effects of particle Reynolds number and turbulence

Identification of Flame Regimes in Partially Premixed Combustion from a Quasi-DNS Dataset

“…Premixed and non-premixed regions in swirl spray flames were analyzed with the flame index concept (Eckel et al 2019;Paulhiac et al 2020) and the influence of swirl number on the combustion regime (Fredrich et al 2019) was evaluated. It was used to study different coal flames (Tufano et al 2018;Wan et al 2019;Rieth et al 2019;, assess the stabilization mechanism of supersonic lifted flames (Bouheraoua et al 2017) and lifted hydrogen flames (Benim et al 2019), classify regions of industrial burners by the combustion regime , study auto-ignition of supercritical hydrothermal flames (Song et al 2019), analyze extinction and re-ignition events (Sripakagorn et al 2004) and gain insight into partially premixed DME flames . It was further applied to scram jets (Shen et al 2020;, Moderate or Intense Low oxygen Dilution (MILD) combustion (Amaduzzi et al 2020), compression ignition engines (An et al 2018), double-cone burners , coaxial diffusion flames , edge flames (Duboc et al 2019) and jet-in-hot-coflow flames in conjunction with tangential stretching rate analysis (Li et al 2019).…”

“…For example, the flame index based on fuel and oxidizer gradients is not applicable in regions of the flame where the fuel is completely consumed. Because of this, different multi-species extensions have been used in the past (Lignell et al 2011;Jangi et al 2015;Minamoto et al 2015;Ma et al 2016;Pei et al 2016;Wei et al 2018;Pang et al 2018;Tufano et al 2018;Hu and Kurose 2019b;Wan et al 2019;Wen et al 2019;. Fiorina et al (2005) found that even in laminar diffusion flames, the flame index concept can make wrong predictions.…”

Detailed simulations for flamelet modelling of SOx formation from coal

“…Recently a number of fully-resolved simulations of single particles [8][9][10][11] and coal particle arrays [12][13][14] have been performed. Vascellari et al [8] pioneered the work on fully-resolved simulations of single coal particle ignition experiments [15] for flamelet modelling.…”

“…The work confirmed the earlier findings in [8] and demonstrated that homogeneous particle ignition always occurs in the downstream wake region behind the particle regardless of gas composition. Tufano et al [13,14] performed fully-resolved simulations of coal particle arrays in both laminar and turbulent flows. Vascellari et al [11] modelled the fully-resolved data of [9] with a flamelet approach, in both a priori and a posteriori simulations.…”

“…Vascellari et al [11] modelled the fully-resolved data of [9] with a flamelet approach, in both a priori and a posteriori simulations. The effects of increasing particle Re p and turbulent flow were investigated in [14]. Tufano et al [13,14] performed fully-resolved simulations of coal particle arrays in both laminar and turbulent flows.…”