Effect of compression ratio variation and waste cooking oil methyl ester on the combustion and emission characteristics of an engine

Abstract

In this research, a thermodynamic zero-dimensional model has been done to predict performance characteristics (in-cylinder pressure, heat released, and the thermal efficiency) of a diesel engine with the use of biodiesel–diesel fuel blends (B0, B20, B50, B80, and B100) at different compression ratios (14, 15, 16, 17, and 18). The corresponding mathematical and thermodynamic relationships have been solved in MATLAB. Based on the experimental tests, it was found that the developed model can predict the engine variables sufficiently. According to the results, the heat release rate and the cylinder pressure increased for all fuel blends by an increase in the compression ratio. Moreover, with the increasing biodiesel amount in the fuel blend (up to 50%) heat release rate and the cylinder pressure increased but these variables have a reduction when biodiesel percentage increases from 50 to 100 due to the lower heating value of waste cooking oil methyl ester in comparison with neat diesel fuel. Moreover, according to the experimental tests, carbon monoxide emission was reduced when biodiesel proportion increased in the fuel blend but the nitrogen oxides emitted from the engine enhanced when biodiesel amount in the fuel mixture increased. According to the results, it can be concluded that B50 has better combustion characteristics among all fuel blends.

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

“…Table 4 shows the selected ASTM International requirements for B100, where these specifications are regularly updated and modified. The use of B100 resulted in lower cylinder pressure and heat release rate than diesel oil and blended biodiesel especially at low and medium loads, as shown in previous studies (Aydın, 2020;Hojati & Shirneshan, 2020;Isik, 2021). Although it was tested with different types of B100, it also showed the same trend.…”

“…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.…”

“…Isik (2021) explained that the peak of cylinder pressure and heat release rate with the use of diesel fuel (USLD) reached 80.55 bar and 69.15 J/o respectively at engine load is 75%, while the use of B100 fuel, the value was much lower. Hojati & Shirneshan (2020) also explained that the cylinder pressure drop reached 10.5% with the use of B100 fuel. Research from Aydın (2020) found that the heat release rate using diesel fuel was 73.01 J/CAD and the use of B100 fuel produced a value of 64.767 J/CAD at a load of 10.8 kW.…”

“…Then, from the second stage of selection, 88 papers were excluded because 82 papers were tested on singlecylinder diesel engines, 5 papers tested on small twin-cylinder engines, and 2 other papers were not confirmed. Finally, we got 12 articles that were selected and qualified for detailed review (Abdalla, 2018;Aydın, 2020;Esonye et al, 2019;García-Martín et al, 2018;Ge et al, 2020;Ghadikolaei et al, 2019;Hojati & Shirneshan, 2020;Isik, 2021;Odibi et al, 2019;Santos et al, 2017;Thangaraja & Srinivasan, 2019;Tosun & Özcanlı, 2021)…”

Effects of Fe2O3 and Al2O3 nanoparticle-diesel fuel blends on the combustion, performance and emission characteristics of a diesel engine

“…The variations in NOx emission versus engine load regarding different nanoparticle-diesel fuel blends are shown in Figure 19. As seen in this figure, the concentration of NOx in the exhaust gas of the engine increased at higher engine loads, which is related to the increase in combustion temperature at higher engine loads (Hojati 2019, Salehian 2020. Based on the findings, a significant reduction (20% on average) was observed in NOx emission following the addition of nanoparticles (especially Al2O3 nanoparticles) to neat fuel diesel.…”