Effect of Cetane Number on Specific Fuel Consumption and Particulate Matter and Unburned Hydrocarbon Emissions from Diesel Engines

Abstract

This paper discusses the effect of ignition delay time in diesel engines on the formation of particulate matter, using fuel formulations with different sulfur concentrations from various sources. Our findings indicate that the cetane number has a significant influence on particulate matter emissions, especially in engines with mechanical fuel injection. The maximum pressure in the combustion chamber increases as the cetane number increases, favoring the increase in the cracking reactions of high molecular weight fractions remaining in the liquid state and thus increasing the production of particulate matter. In certain conditions, this increase in pressure has a beneficial effect on the thermal efficiency of the cycle. Higher temperatures in the combustion chamber augment the speed of oxidation, reducing unburned hydrocarbon emissions. The ignition delay time of fuel has a strong effect on the formation of particulate matter and on the emission of unburned hydrocarbons.

The effect of cetane number and oxygen content in the performance and emissions characteristics of a diesel engine using biodiesel blends

“…Reduced cetane numbers (CN) fuel values are undesirable because of their nature to prolong ignition delay, which causes increased engine peak cylinder combustion pressures (Baczewski et al, 2015;Yanowitz et al, 2017), increased engine combustion noise and wear in addition to increased NO X emissions. This impact resulting from alteration of CN has been extensively studied (Kidoguchi et al, 2000;I çıngür and Altiparmak, 2003;Takahashi et al, 2011;Szybist and Bunting, 2005;Kurtz and Polonowski, 2017;Watanabe et al, 1998;Cataluña and Da Silva, 2012;Chaichan and Ahmed, 2012;Chukwuezie et al, 2017;Reijnders et al, 2016;Tat, 2011). Plastics have substantial stored potential energy of hydrocarbons inherent in their molecular structure (Mani et al, 2011).…”

Enhancing the Lubricity of Gas-to-Liquid (GTL) Paraffinic Kerosene: Impact of the Additives on the Physicochemical Properties

“…In general, fuels with high n-para nic content tend to have low ignition delay time compared to fuels with high content of iso-para ns and aromatics [33]. In addition to fuel composition, the fuel's volatility has a signi cant impact on delay times as the injected fuel forms droplets which evaporate before ignition.…”

Emission Performance of a Diesel Engine Fuelled with Petrol Diesel, Green Diesel, and Waste Cooking Oil Blends

“…HC is mainly the result of flame extinction in the cold region of the chamber; it is also generated in locally lean and locally rich regions. Its formation is related to the fuel volatility, viscosity, and cetane number (CN) [21,22], too. The trends highlight that diesel+ net or in blends with WCO has a positive effect on this emission.…”