Impact of Biodiesel Blends on Combustion and Endurance Characteristics of Diesel Engines

Abstract

Biodiesel is a promising alternative fuel to run the automotive engine. However, its blends have not been properly investigated during idling as it is the main problem to run vehicles in a big city. In this study, the impact on CO, NOx and lubricating oil with various biodiesel blends was investigated to show the feasibility of biodiesel and various blends. The presence of more CO in exhaust gases indicates incomplete combustion. In terms of exhaust emissions, researchers agree that biodiesel produced fewer CO and NOx emissions in comparison with diesel fuel. Moreover, the reduction in emissions can be improved by optimizing the engine parameters such as engine speed and load. Accordingly, the research proposed the emissions of a diesel engine by using plastic pyrolytic oil, palm oil biodiesel and diesel. This discovered that CO emissions were reduced with increasing engine brake power at lower loads. However, the exhaust of NO_x emissions was still high with the use of biodiesel blends, mainly due to the oxygen content of biodiesel. NO_x formations are responsible for high oxygen content and high in-cylinder temperature. By controlling the engine load and ratio of biodiesel blends, NOx emissions can be maintained at a lower level. Combustion is one of the critical processes in engines that has a considerable on performance and emissions. The ignition delay, cylinder pressure, CD, and heat release rate are important parameters that indicate the efficiency of the combustion process. Combustion characteristics of biodiesel-butanol blends at different injection pressures are utilized in this study. Specifically, NO_x emissions are affected by combustion characteristics such as combustion duration (CD) and in-cylinder pressure. The increase in engine speed decreases the pressure due to the low burning rate of biodiesel during the ignition delay interval. The wear and friction mechanism was studied by analyzing the compositions and kinematic viscosities of the oil samples. . Engine performance, emission and combustion characteristics were investigated by operating the engine at full load conditions and varying engine speeds. The present work is implemented using Matlab software. Consequently, cylinder pressure is dependent on the combustion stage of fuel, so a higher calorific value will also give rise to higher cylinder pressure, and the combustion duration of the sample is improved.