Numerical study on the influence of injection pressure on the ignition and combustion of n-dodecane spray at cold-start conditions

Shi, Zhongjie; Liu, Fushui; Shang, Weiwei; Li, Yikai; Sun, Chenghan; Zhu, Ming

doi:10.1016/j.fuel.2019.116882

Cited by 29 publications

(2 citation statements)

References 38 publications

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“…More recently, the effects of ambient n-dodecane fuel and gas environment have been discussed in detail in Kim et al 14 by using a multienvironment PDF approach combined with a tabulated chemistry model, and the two-stage ignition process was revealed by the temporal evolutions of the mass fractions of the main species. The distinct two-stage auto-ignition has also been found by Shi et al 15 when investigating the influence of injection pressure on the n-dodecane spray flame structures at cold-start conditions. To further understand the chemical reaction effect hidden behind the n-dodecane spray flame, the chemical kinetic mechanism was coupled to analyze the main reaction pathways in the different heat release zones by Liu et al 16 These investigations are all based on the ENC spray A experimental configuration using the single component ndodecane fuel.…”

Section: Introductionsupporting

confidence: 67%

Modeling spray combustion using multi-component surrogate fuels

Yang

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Kerosene and diesel fuels involved in spray combustion operations are complex fuels composed of a wide and diverse variety of hydrocarbon components. For practical numerical modeling of the evaporation and combustion phenomena in a combustor, well-designed surrogates fuels that can mimic the real fuel thermal and chemical properties can be utilized. In this study, predictions and validations of the influence of fuel on the liquid and vapor penetration characteristics within a constant-volume chamber were first performed utilizing a benchmark m-xylene/ n-dodecane, Jet-A, and diesel surrogate fuels. Then, simulations of reacting spray of a bi-component m-xylene/ n-dodecane fule, and a four-component Jet-A surrogate fuel ( n-dodecane (C12H26), iso-cetane (C16H34), trans-decalin (C10H18) and toluene (C7H8)) were studied aided by skeleton chemical kinetic mechanisms available from the literature. The results of ignition delay time, lift-off length, radicals, and the mass fraction histories of fuel species were comprehensively used to assess the performance of relevant thermophysical and chemical sub-models. Two different chemical mechanisms were compared in detail to investigate the effect of the chemical kinetics model on the flame structures and spray characteristics. It has been found that the spray ignition of multi-component fuels is remarkably influenced by the chosen chemical kinetic mechanism and less affected by the droplet evaporation models.

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Section: Introductionsupporting

confidence: 67%

Modeling spray combustion using multi-component surrogate fuels

Yang

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…They showed 77% reduction in fuel consumption during engine cranking and 55% reduction in light-off time, along with 81% reduction in HC production in the FTP75 driving cycle. The effects of injection pressure on the combustion and emissions of the diesel engine were also investigated by Shi et al 38 The emissions were decreased by increasing the injection pressure. The effect of exhaust gas recirculation on the emission was investigated by Enrique.…”

Section: Introductionmentioning

confidence: 99%

Cold-start emission reduction of the gasoline-powered vehicle utilizing a novel method

Teymoori

Chitsaz

Kashani

et al. 2022

International Journal of Engine Research

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Most vehicle tailpipe emissions are related to the cold-start condition. In the present study, a novel methodology is introduced to trap the cold-start emissions. A numerical model is used to investigate the method implementation on the vehicle’s cold-start emissions. Model is validated with the experimental data. Three different driving cycles are simulated to understand the effects of the employed method. The results show that the light-off temperature is independent of the driving cycle, while the light-off time is highly dependent on the driving behavior. The presented concept is more effective for traffic conditions and the low required powers of the vehicle. The most emission reduction is related to the emissions with moderate increment after catalyst light off. Therefore, the most considerable reduction is related to the NOx emission in all driving conditions, while method implementation is not beneficial for CO reduction compared to NOx. The emission reduction varies from 20% (WLTC) to 35% (NEDC) for CO emission, from 25% (WLTC) to 34% (NEDC and FTP75) for HC emission and 41% (FTP75) to 51% (NEDC) for NOX emission. This idea would help gasoline-powered vehicles to pass more strict emissions such as Euro7 in the coming future.

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