Numerical investigation on the ignition and flame characteristics of n-dodecane-n-butanol spray under diesel engine conditions

Feasibility on equivalence ratio measurement via OH*, CH*, and C2* chemiluminescence and study of soot emissions in co-flow non-premixed DME/C1–C2 hydrocarbon flames

“…C 2 H 2 and C 2 H 4 were only considered as the soot precursors for investigating soot formation. As the default parameters of the Moss-Brookes soot model were originally identified to predict soot production in CH 4 combustion (Brookes and Moss, 1999;Wen et al, 2003), they required adjustment to enhance the soot predictions of current fuels and to replicate the current experimental findings (Pang et al, 2012;Jia Chiet Choo et al, 2022). The activation energy (E activ ) is a parameter that is most commonly changed in most modeling work that includes reactions.…”

“…Another two important default parameters in the Moss-Brookes soot model that need calibration because of their crucial roles in soot generation are the rates of soot inception (C α ) and soot surface growth (C γ ) (Leung et al, 1991;Bolla et al, 2013;Pang et al, 2015;Jia Chiet Choo et al, 2022). The default values for C α and C γ suggested in the Moss-Brookes model are 54 and 11,700, respectively.…”

“…Many studies have used a value of 10,000 for C α (Bolla et al, 2013;Pang et al, 2015;Chishty et al, 2018), whereas more variation in the C γ value has been observed in previous studies (McEnally et al, 1998;Bolla et al, 2013; Frontiers in Fuels frontiersin.org Chishty et al, 2018), ranging from 6,000 to 72,000. Therefore, another parametric study of the C α and C γ values was conducted based on the approach proposed by Jia Chiet Choo et al (2022) in which a test matrix was built to calibrate the rates of soot inception and surface growth.…”

“…However, wide ranges of these values are recommended in the literature (see Section 2.4). Therefore, based on the values in different studies (Vishwanathan and Reitz, 2010;Bolla et al, 2013;Pang et al, 2015;Chishty et al, 2018;Jia Chiet Choo et al, 2022), a test matrix was built for conducting the parametric study of the soot 2022) showed that the peak SVF of the F12 and F13 flames along the centerline was approximately 0.6 ppm (across different acquisition delay times up to 500 ns). Values of 10,000 and 72,000 for C α and C γ , respectively, provided the closest peak SVF to the experimental results.…”

A numerical study of piston bowl geometry and diesel injection timing in a heavy-duty diesel/syngas RCCI engine

“…This is due to the nature of the diesel combustion in which the flame front develops and the majority of the air-fuel mixture burns in diffusive combustion mode. 22 Combustion phasing is also crucial in RCCI dual-fuel combustion engines since the combustion process occurs under lean air-fuel mixture conditions, and the formation and development of flame front inside the engine cylinder determines the quality of the combustion characteristics. 23 The ID period, combustion phasing, and combustion duration in compression ignition diesel engines are directly dependent on the main SOI timing.…”