Review of Experimental and Computational Studies on Spray, Combustion, Performance, and Emission Characteristics of Biodiesel Fueled Engines
01 Dec 2018-Journal of Energy Resources Technology-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 140, Iss: 12, pp 120801
TL;DR: In this article, a critical review of the effect of biodiesel's fuel properties on engine performance, emissions, and combustion characteristics in existing diesel engines vis-a-vis conventional diesel has been undertaken.
Abstract: Biodiesel has emerged as a suitable alternative to mineral diesel in compression ignition (CI) engines in order to ensure global energy security and to reduce engine out emissions in near future. Biodiesel derived from various feedstocks available worldwide fits well in the current fuel supply arrangement for transport sector. However, biodiesel as an alternative transportation fuel has been extensively investigated because of differences in its important fuel properties compared with baseline mineral diesel. Since fuel properties greatly influence spray development, combustion, and emission formation in internal combustion (IC) engines, a number of experimental and computational studies on biodiesel usage in CI engines have been performed to determine its brake thermal efficiency (BTE), gaseous emissions, durability, etc., by various researchers using variety of engines and feedstocks. In the present paper, a critical review of the effect of biodiesel's fuel properties on engine performance, emissions, and combustion characteristics in existing diesel engines vis-a-vis conventional diesel has been undertaken. In addition, the progress and advances of numerical modeling involving biodiesel are also reviewed to determine the effect of fuel properties on spray evolution and development of reaction mechanisms for biodiesel combustion simulations. Fuel properties are discussed in two categories: physical and chemical properties, which are key parameters affecting spray and combustion processes. Subsequent sections review spray, combustion, emissions, and performance characteristics of biodiesels under various engine operation conditions. In the last section of this review paper, numerical modeling of biodiesel covering recent numerical models and schemes to understand the behavior of biodiesel combustion and pollutants formation is included. This review paper comprehensively summarizes biodiesel fuel's (BDFs) spray, combustion, and emission characteristics using experimental and numerical approaches. Limitations and scope for future studies are discussed in each section.
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TL;DR: In this article, a single-cylinder engine fueled with MD10 and MD15 was compared with baseline mineral diesel using a fuel additive (1-dodecanol), and the results indicated that methanol blending with mineral diesel resulted in superior combustion, performance, emissions, and particulate characteristics.
Abstract: Miscibility of methanol in mineral diesel and stability of methanol–diesel blends are the main obstacles faced in the utilization of methanol in compression ignition engines. In this experimental study, combustion, performance, emissions, and particulate characteristics of a single-cylinder engine fueled with MD10 (10% v/v methanol blended with 90% v/v mineral diesel) and MD15 (15% v/v methanol blended with 85% v/v mineral diesel) are compared with baseline mineral diesel using a fuel additive (1-dodecanol). The results indicated that methanol blending with mineral diesel resulted in superior combustion, performance, and emission characteristics compared with baseline mineral diesel. MD15 emitted lesser number of particulates and NOx emissions compared with MD10 and mineral diesel. This investigation demonstrated that methanol–diesel blends stabilized using suitable additives can resolve several issues of diesel engines, improve their thermal efficiency, and reduce NOx and particulate emissions simultaneously.
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TL;DR: In this paper, the optimum dosing level of aqueous aluminum oxide nanofluid in diesel to improve combustion and engine performance and also to overcome the engine emission issues especially, the oxide of nitrogen, smoke, HC, and particulate matter was identified.
Abstract: This study attempts to identify the optimum dosing level of aqueous aluminum oxide nanofluid in diesel to improve combustion and engine performance and also to overcome the engine emission issues especially, the oxide of nitrogen, smoke, and the particulate matter. The aqueous aluminum oxide (aluminum oxide nanoparticle aqueous 5 wt % suspension) is used as a nanofluid. The dosing level of nanofluid is varied from 30 cc to 60 cc in steps of 10 cc for the performance study. Fuel blend properties such as calorific value, density, kinematic viscosity, and flash point are determined using ASTM standard test methods. Among all blends, the D+50AN showed a maximum improvement of about 5.9% in brake thermal efficiency (BTE) and remarkable reduction in NOx, smoke, HC, and CO as 15.6%, 22.34%, 31.82%, and 13.79%, respectively, at maximum rated power output.
21 citations
TL;DR: In this paper, a high-speed charge coupled device (CCD) camera at different fuel injection pressures (FIPs) and ambient pressures (APs) in a constant volume spray chamber was used to characterize the fuel spray evolution and spray shape, which affects in-cylinder combustion and particulate emission characteristics of compression ignition (CI) engines.
Abstract:
Spray analysis is used to characterize the fuel spray evolution and spray shape, which affects in-cylinder combustion and particulate emission characteristics of compression ignition (CI) engines. In this study, spray evolution of biodiesel blends and mineral diesel was captured using a high-speed charge coupled device (CCD) camera at different fuel injection pressures (FIPs) and ambient pressures (APs) in a constant volume spray chamber (CVSC). Results showed that spray parameters were significantly affected by FIP and AP. Higher FIPs resulted in longer fuel spray penetration length (Ls) and reduced spray cone angle (As). However, AP variation showed an exactly opposite trend of Ls and As. Increasing AP resulted in shorter Ls and increased As. Fuel properties also affected the spray characteristics, which slightly improved for lower biodiesel blends (B20: 20% v/v blend of biodiesel with mineral diesel) and then degraded for higher biodiesel blends (B40: 40% v/v blend of biodiesel with mineral diesel) with respect to baseline mineral diesel. The effects of these findings of fuel spray analysis were validated using engine experiments, which were performed in a single-cylinder research engine using identical test fuels and fuel injection parameters. Relatively superior combustion of B20-fueled engine and lower particulate emissions at higher FIPs showed good agreement with spray results.
18 citations
TL;DR: In this article, a turbocharged diesel engine operated in dual fuel mode was investigated, where the gas flow rate was varied for all the fuels with fixed optimal loading conditions at 3.77
16 citations
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