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To explore the more effective method to fulfill soot reduction challenges of early-injection conditions, different engine operating parameters such as intake pressure, exhaust gas recirculation (EGR), equivalence ratio, intake temperature, coolant temperature, injection pressure and fuel properties such as using the blends of diesel/gasoline, diesel/n-butanol and dual-fuel were investigated on a diesel...
In the last decades, diesel engines have attracted an increasing interest from vehicles producer and public, due to their higher thermal efficiency, less CO and unburned hydrocarbons emission, and longer lifetime comparing with gasoline engines. However, the high emission of soot particulates and NOx are still their key problems. The combination of filters and oxidation catalysts is one of the most...
Soot formation in ‘Delft Flame III’, a pilot stabilized turbulent diffusion flame burning natural gas/air, is investigated using ANSYS FLUENT by considering two different approaches for soot inception. In the first approach soot inception is based on the formation rate of acetylene, while the second approach considers the formation rate of two and three-ringed aromatics to describe the soot inception...
The effect of methyl oleate and ethanol addition on the combustion characteristics and soot emission of single droplets of diesel was studied by means of experimentation and kinetic modelling. The experiments were performed using a high-temperature tube furnace operating at 973K and the soot intensity indicated by the soot KL factor, and flame temperature were simultaneously measured using a two-colour...
The sooting characteristics of pure substituted-aromatic fuels in a wick-fed diffusion flame were studied in terms of the particle size distribution (PSD) of the soot. The temperature and PSDs were measured at the tip of flames of different heights, using a thin-wired thermocouple and differential mobility spectrometer. The temperature at the tip of the flames was found to decrease with increases...
With the improvements in technologies to produce 2,5-dimethyfuran (DMF) from biomass such as cellulose, the potential of this biofuel to completely or partially replace fossil fuels in order to reduce our dependence on them and to curb pollutant emissions has been explored in some recent studies. In this work, the effect of the addition of DMF (up to 15% by volume) to diesel on the sooting propensity...
The particulate matter sampled in exhaust gas from low temperature diesel combustion (LTC) with an exhaust gas recirculation rate of 60% in a direct injection compression ignition engine was comprehensively assessed and compared to conventional diesel combustion using thermogravimetric analysis and elemental analysis. With LTC, relatively significant mass reduction occurred due to the oxidation and...
A skeletal reaction mechanism of n-heptane combustion is developed and validated. The axisymmetric laminar co-flow diffusion flames of n-heptane/oxygen are simulated using the skeletal mechanism at elevated pressure, and the chemical reaction paths in three reaction zones of flame are presented. The n-heptane/oxygen flame height decreases from 8.8 to 5.6mm with the increase of pressure from 0.1 to...
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