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Modeling for collective effect of Muffler geometric modifications and blended microalgae fuel use on exhaust performance of a four-stroke diesel engine: A Computational Fluid Dynamics Approach
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
Engine performance significantly depends on the effective exhaust of the combustion gases from the muffler. With stricter BSVI norms more efficient measures has to be adopted to reduce the levels of exhaust emissions from the exhaust to the atmosphere. Muffler along with reducing the engine noise, is intended to control the back pressure as well. Back pressure change has significant effect on muffler temperature distribution which affects the NOx emission from the exhaust. Many research communications have been made to reduce the exhaust emissions like HC, CO and CO2 from the exhaust by using different generation biofuels as alternate fuel, yet they have confronted challenges in controlling the NOx content from exhaust. This work presents the combined effect of Muffler geometry modifications and blended microalgal fuel on exhaust performance with an aim to reduce NOx emission from the exhaust of a four-stroke engine. In this exertion, computational fluid dynamics model is developed to analyze the effect of muffler geometry modification on vital exhaust parameters of an engine. The engine is powered with blend of microalgae Schizochytrium Specie and diesel. The engine used for testing is a four-stroke diesel, water-cooled, SOHC engine. The muffler geometry such as: Chambered Elliptic (CE) and Turbo Elliptic (TE) are designed for study. The combined effect of muffler geometry modification and blended microalgal fuel use on back pressure, chamber temperature, Pressure and Velocity distribution are deliberated. The result shows that the chambered elliptic muffler using B5 (5% Algal fuel) developed significantly less exhaust temperature, whereas the gas density is minimum in case of turbo elliptic muffler using B15 (15% Algal fuel). Finally, the velocity is slightly higher in case of chambered elliptic muffler using B5 blend. The work aims to reduce the NOx emissions by analyzing the use of combined effect of microalgae fuel and muffler geometry modifications on exhaust parameters by controlling the back pressure in the muffler. Almost no research is reported in this field of work for microalgal fuels which is the objective of this work.