Assessment of n-pentanol/Calophyllum inophyllum/diesel blends on the performance, emission, and combustion characteristics of a constant-speed variable compression ratio direct injection diesel engine

Abstract

Alcohol is used as an additive for a long time with the petroleum-based fuels. In this study, the higher alcohol, n-pentanol, was used as an additive to Calophyllum inophyllum (CI) biodiesel/diesel blends at 10, 15, and 20% by volume. In all blends, the ratio of CI was maintained at 20% by volume. The engine characteristics of the pentanol fuel blends were compared with the diesel and CI20 (Calophyllum inophyllum 20% and diesel 80%) biodiesel blend. The nitrogen oxide (NO) emission of the pentanol fuel blends showed an increased value than CI20 and neat diesel fuel. The carbon dioxide (CO) also increased with increase in pentanol addition with the fuel blends than CI20 fuel blend and diesel. The carbon monoxide (CO) and hydrocarbon (HC) emissions were decreased with increase in pentanol proportion in the blend than the CI20 fuel and diesel. The smoke emission was reduced and the combustion characteristics of the engine were also improved by using pentanol blended fuels. From this investigation, it is suggested that 20% pentanol addition with the biodiesel/diesel fuel is suitable for improved performance and combustion characteristics of a diesel engine without any engine modifications, whereas CO and NO emissions increased with addition of pentanol due to effective combustion.

Exergy analysis of a diesel engine fuelled with Aegle marmelos de‐oiled seed cake pyrolysis oil opus

“…This is because of the enhanced atomization and enriched air/fuel mixer ratio, which creates the enhanced combustion of fuel molecules 2 . When compared to previous pyrolysis oil studies ( Calophyllum inophyllum pyrolysis oil blends, 3 mahua pyrolysis oil blends, 38 jatropha pyrolysis oil blends, 39 jatropha methyl ester + tyre pyrolysis oil, 40 and n‐pentanol+ Calophyllum inophyllum blends 37 ), F20 spectacles lower BSFC value.…”

“…The higher consumption of bio‐oil is due to the low CV and high viscosity as compared with F0 1 . In general, biofuel has a greater BSFC compared with neat diesel at a standard compression ratio 37 . At a lesser W, the combustion process was weakened, due to the minimum combustion process temperature 31 .…”

“…The augmenting trend of W increased the combustion chamber temperature, which causes a decrease in the BSFC value 35 . When using a diesel fuel, BSFC reductions with increasing the W, due to better combustion at high W condition 37 . This is owing to the fact that, fuel completely burns at high engine load 7 .…”

“…Figure depicts the BTE values with respect to W. From that, F5 (0.59 kg/kW‐hr) fuel has more BSFC value required for to create the equal diesel power output value at 100% of W. The blending of surfactants in the AM bio‐oil blends to reduce the viscosity, increase the spray distinctiveness, atomization and auto‐ignition temperature 3 . The BTE is maximum for higher loads 37 . This is because of the increase in the mean effective pressure and combustion temperature which in turn enhances the combustion process 32 .…”

Utilization of Pentanol as Biofuels in Compression Ignition Engines

“…Furthermore, based on the response surface methodology, it was noticed that ternary blend-fueled engine exhibited better performance and emission at a compression ratio of 17.5, P20CI20D60 blend, and 2.5 brake mean effective pressure load conditions (Ramakrishnan et al, 2018b). However, Appavu et al (2019a) reported that the addition of pentanol to diesel/Jatropha biodiesel blends (D60B20P20) resulted in reduction of CO and NOx emissions and smoke opacity, simultaneously.…”