Development of a laminar burning velocity empirical correlation for combustion of iso-octane/ethanol blends in air

Sekularac, Nikola; Fang, Xiaohang; Shankar, Varun; Baker, S.J.; Leach, Felix; Davy, Martin

doi:10.1016/j.fuel.2021.121880

Cited by 17 publications

(9 citation statements)

References 55 publications

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“…Previous work from Sekularac et al [16] has developed correlations based on mixing rules for ethanol/iso-octane blends and showed good agreement at elevated temperatures and pressures with experimental results. With limited data available for LBV measurements at elevated temperature and pressure, especially for mixtures with more than three components, additional laminar burning velocities measurements are needed for the development of chemical mechanisms and the validation of widely adopted mixing rules.…”

Section: Introductionmentioning

confidence: 70%

“…Chemical kinetic LBV predictions using the Li et al mechanism are also presented. The effectiveness of these predictions for ethanol, iso-octane, and n-heptane are discussed in previous publications [16,32]. Whilst Li et al's mechanism is able to capture the trend of toluene's LBV, the predictions are consistently higher than the experimental data for both temperatures and across the pressure range.…”

Section: Pure Componentsmentioning

confidence: 87%

“…The former method includes the ignition and flame stretch effects, whereas, in the latter method, the thermodynamic data from the multi-zone BOMB program [18] is used to calculate the burning velocity and schlieren imaging was used to detect the onset of cellularity. Details of the constant volume combustion bomb and implementation of the two methods can be found in [16,19] where a schematic of the data processing procedure is shown in 2. The major sources of error were identified by previous studies using the same set up which are from mixture preparation and extrapolation to zero stretch [17].…”

Section: Experimental Apparatus and Data Analysismentioning

confidence: 99%

“…Whilst the results of iso-octane, ethanol, and n-heptane have been presented previously by the group [16,19,32], the results of Burning velocity [cm/s] Davis and Law [34] (1 bar) Hirasawa [26] (1 bar) Kumar [33] (1 bar) Ji [35] (1 bar) Sileghem [36] (1 bar) Dirrenberger [37] toluene are presented for the first time in open literature. Figure 3, shows the available literature data of toluene at atmospheric pressure with varying temperatures compared with both the flame front imaging (circle marks) and pressure rise method (correlation lines) experiments.…”

Section: Pure Componentsmentioning

confidence: 99%

“…Figure 8 shows the comparison between results from two mixing rules compared with both numerical simulations and experiments for ternary mixtures. The comparison of the mixing rules for binary and quaternary mixtures have been previously discussed by Sekularac et al [16] and Hinton [39], respectively. The two variations of Le Châtelier mixing rules (mole faction based and energy fraction based) are performed using the experimentally determined pure THEO components' laminar burning velocities.…”

Section: Ternary Mixturesmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Ethanol Addition on the Laminar Burning Velocity of Gasoline Surrogates With Toluene

Shankar

Fang

Hinton

et al. 2022

ASME 2022 ICE Forward Conference

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Laminar burning velocity (LBV) is a crucial parameter in many practical combustion simulations, and the acquisition of LBVs is a critical step for evaluating potential alternative fuels and/or suitable surrogates. Ethanol is regarded as one of the most promising alternative fuels, particularly for spark ignition engines, as it may be produced from renewable biomass. While there exists data showing the pressure dependence on ethanol’s LBV compared to iso-octane and n-heptane (primary reference fuels (PRFs)), the relative magnitude of the pressure dependence of LBV between ethanol and toluene has not been established. The inclusion of toluene is important because commercial gasoline has significant levels of aromatics. In this work, common gasoline surrogate components of iso-octane, n-heptane, toluene, and ethanol were studied as pure compounds and in equal volume binary, ternary, and quaternary mixtures. Experiments are conducted in a spherical combustion bomb at elevated temperatures (380 K and 450 K) and pressures (1 to 4 bar). Under these conditions, ethanol and n-heptane present faster LBVs than iso-octane and toluene, particularly at 450 K. Ethanol and iso-octane present strong pressure dependence, with this effect accentuated at higher temperature conditions. As equal volume mixtures were studied, the effect of these distinct behaviours was examined in comparison to chemical kinetic predictions and widely used mixing rules.

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Section: Introductionmentioning

confidence: 70%

Section: Pure Componentsmentioning

confidence: 87%