scholarly journals Effect of Injector Opening Pressure and Injection Timing on Exhaust Emissions and Combustion Characteristics of Rice Bran Oil in Crude Form and Biodiesel Form in Direct Injection Diesel Engine

2014 ◽  
Vol 4 (2) ◽  
pp. 09-19
Author(s):  
N. Durga Prasada Rao
Keyword(s):  
Diesel Engine ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Direct Injection ◽  
Exhaust Emissions ◽  
Combustion Characteristics ◽  
Injection Timing ◽  
Opening Pressure ◽  
Direct Injection Diesel Engine

Comparative Performance, Emission, and Combustion Characteristics of Rice-Bran Oil and Its Biodiesel in a Transportation Diesel Engine

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Avinash Kumar Agarwal ◽  
Atul Dhar
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Rice Bran ◽  
Heat Release Rate ◽  
Release Rate ◽  
Rice Bran Oil ◽  
Direct Injection ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Comparative Performance

The methyl esters of vegetable oils known as biodiesel are becoming increasingly popular because of their low environmental impact and potential as a green alternative fuel for diesel engines. Methyl ester of rice-bran oil (RBOME) is prepared through the process of transesterification. In the present investigation, experiments have been carried out to examine the performance, emission, and combustion characteristics of a direct-injection transportation diesel engine running with diesel, 20% blend of rice-bran oil (RBO), and 20% blend of RBOME with mineral diesel. A four-stroke, four-cylinder, direct-injection transportation diesel engine (MDI 3000) was instrumented for the measurement of the engine performance, emissions, in-cylinder pressure-crank angle history, rate of pressure rise, and other important combustion parameters such as instantaneous heat release rate, cumulative heat release rate, mass fraction burned, etc. A careful analysis of the performance, emissions, combustion, and heat release parameters has been carried out. HC, CO, and smoke emissions for RBO and RBOME blends were lower than mineral diesel while NOx emissions were almost similar and brake specific fuel consumption (BSFC) was slightly higher than mineral diesel. Combustion characteristics were quite similar for the three fuels.

Combustion Characteristics of Rice Bran Oil Derived Biodiesel in a Transportation Diesel Engine

2006 ◽  
Author(s):  
Shailendra Sinha ◽  
Avinash Kumar Agarwal
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Rice Bran ◽  
Heat Release Rate ◽  
Release Rate ◽  
Rice Bran Oil ◽  
Direct Injection ◽  
Pressure Rise ◽  
Combustion Characteristics ◽  
Experimental Investigations

The methyl esters of vegetable oils, known as biodiesel are becoming increasingly popular because of their low environmental impact and potential as a green alternative fuel for diesel engines. They do not require significant modification in existing engine hardware. Methyl ester of rice bran oil (ROME) is prepared through the process of transesterification. Previous research has shown that ROME has comparable performance, lower bsfc in comparison to diesel. There was reduction in the emissions of CO, HC, and smoke but NOx emissions increased. In the present research, experimental investigations have been carried out to examine the combustion characteristics of a direct injection transportation diesel engine running with diesel, and 20% blend of ROME with diesel. A four-stroke, four-cylinder, direct-injection transportation diesel engine (MDI 3000) was fully instrumented for the measurement of combustion pressure, rate of pressure rise and other combustion parameters such as instantaneous heat release rate, cumulative heat release rate, mass fraction burned etc. Tests were performed at different loads ranging from no load to 100%, at constant engine speed. No engine hardware modification was carried out for the present study. A careful analysis of combustion and heat release parameters has been carried out, which gives precise information about the in-cylinder combustion of rice bran oil based biodiesel vis-a`-vis mineral diesel.

scholarly journals A Study on the Effects of Duration of Injection on Emissions and Combustion Characteristics in a Direct Injection Diesel Engine

2014 ◽  
Vol 17 (4) ◽  
pp. 67-76
Author(s):  
Em Van Tong Nguyen ◽  
Khai Le Duy Nguyen
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Engine Performance ◽  
Combustion Characteristics ◽  
Injection Timing ◽  
Oxides Of Nitrogen ◽  
Direct Injection Diesel Engine ◽  
Maximum Value ◽  
Nitrogen Emission ◽  
Di Diesel Engine

This paper present a study of the effects of duration of injection on emissions and combustion characteristics in a direct injection diesel engine using CFD code KIVA-3V. In this study, duration of injection was also changed from 6o to 12o CA while the injection timing is constant to evaluate the effect on DI Diesel engine performance, indicated specific fuel consumption and particulates and oxides of nitrogen emission. The obtained results indicate that the capacity of the engine reaches its maximum value and NOx and soot emissions is decreased when the duration of injection is in the range of 6o to 9o CA.

scholarly journals Effects of pilot injection timing and EGR on a modern V6 common rail direct injection diesel engine

2013 ◽  
Vol 50 ◽  
pp. 012008 ◽  
Author(s):  
Nik Rosli Abdullah ◽  
Rizalman Mamat ◽  
Miroslaw L Wyszynski ◽  
Anthanasios Tsolakis ◽  
Hongming Xu
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Common Rail ◽  
Injection Timing ◽  
Pilot Injection ◽  
Direct Injection Diesel Engine

Spray and Combustion Characteristics of Biodiesel∕Diesel Blended Fuel in a Direct Injection Common-Rail Diesel Engine

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Hyun Kyu Suh ◽  
Hyun Gu Roh ◽  
Chang Sik Lee
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Direct Injection ◽  
Injection Rate ◽  
Combustion Characteristics ◽  
Biodiesel Fuel ◽  
Injection Timing ◽  
Pilot Injection ◽  
Blended Fuel ◽  
Conventional Diesel Fuel

The aim of this work is to investigate the effect of the blending ratio and pilot injection on the spray and combustion characteristics of biodiesel fuel and compare these factors with those of diesel fuel in a direct injection common-rail diesel engine. In order to study the factors influencing the spray and combustion characteristics of biodiesel fuel, experiments involving exhaust emissions and engine performance were conducted at various biodiesel blending ratios and injection conditions for engine operating conditions. The macroscopic and microscopic spray characteristics of biodiesel fuel, such as injection rate, split injection effect, spray tip penetration, droplet diameter, and axial velocity distribution, were compared with the results from conventional diesel fuel. For biodiesel blended fuel, it was revealed that a higher injection pressure is needed to achieve the same injection rate at a higher blending ratio. The spray tip penetration of biodiesel fuel was similar to that of diesel. The atomization characteristics of biodiesel show that it has higher Sauter mean diameter and lower spray velocity than conventional diesel fuel due to high viscosity and surface tension. The peak combustion pressures of diesel and blending fuel increased with advanced injection timing and the combustion pressure of biodiesel fuel is higher than that of diesel fuel. As the pilot injection timing is retarded to 15deg of BTDC that is closed by the top dead center, the dissimilarities of diesel and blending fuels combustion pressure are reduced. It was found that the pilot injection enhanced the deteriorated spray and combustion characteristics of biodiesel fuel caused by different physical properties of the fuel.

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