Optimization of Injection Pressure and Injection Timing on Fuel Sprays, Engine Performances and Emissions on a Developed DI 20C Biodiesel Engine Prototype

Abstract

Biodiesel, as a renewable fuel that has the potential to replace diesel fossil fuels. With properties in the form of viscosity, density, and surface tension, which are higher than diesel fossil fuel, biodiesel produces poor spray characteristics, and also the high cetane number and oxygen content so that the ignition delay is shorter causes the start of combustion will shift more forward, therefore need to improve injection parameters including injection pressure and timing. The aim of this research is to get the optimal injection parameter optimization so as to improve engine performances and emissions. The method used is to increase the fuel injection pressure from 200 to 230 kg/cm2 and the injection timings were retarded from 22° to 16° BTDC. The results show that increasing injection pressure can improve spray characteristics as indicated by shorter penetration and smaller spray diameter of 30% and 9.8%, respectively and increase in spray spread angle of 21.9%. Then the optimization of engine performances and emissions, obtained at an injection pressure of 230 kg/cm2 and injection timing of 16° BTDC with an increase of power and thermal efficiency of 3.9% and 13.9%, respectively and reduction in smoke emissions of 45.2% at high load.

The Concise Latest Report on the Advantages and Disadvantages of Pure Biodiesel (B100) on Engine Performance: Literature Review and Bibliometric Analysis

“…The decrease in thermal efficiency can be seen in Figures 6 and Figure Aydın (2020) described the decrease in thermal efficiency with B100 caused by poor combustion efficiency due to spray atomization. Balasubramanian et al, (2021) also explained the decrease in thermal efficiency that occurred in B100 due to its high viscosity and low heating value, as also described by Sudarmanta et al, (2020) However, thermal efficiency in B100 applications can be improved through; (1) increasing the compression ratio (CR) (Hojati & Shirneshan, 2020), (2) adding ethyl proxitol and methyl proxitol catalysts to B100 (Aydın, 2020), and adding alcohols such as pentanol, butanol, and octanol to B100 (Isik, 2021). One of the results of efforts made to improve thermal efficiency is shown in Figure 8.…”

Environmental Aspects of a Common Rail Diesel Engine Fuelled with Biodiesel/Diesel Blends

“…Apart from the previously used traditional methods of assessing the parameters of injection and combustion of mixtures of RME with diesel fuel [26][27][28][29], attempts are made to use new phenomena of numerical modelling to develop the impact of fuel properties on the course of mechanism reaction in the combustion chamber [30]. Model studies are also carried out on the impact of the fuel injection pressure on the delay of auto-ignition, the fuel atomization and combustion processes [31].…”

The Effects of Dill Oil Biodiesel on CI Engine Emissions and Performance

“…The BDF blends of BD10, BD20, BD40, BD60, BD80, and D100 resulted in 9.09%, 14.34%, 20.79%, 27.19%, 33.28%, and 42.98% increases at maximum engine load, respectively. The actual cause of this increase is the (O2) concentration of the BDF mix, which is essential for the oxidation of fuel vapour or CO, which ultimately results in the conversion to CO2 [46,47].…”