A Study on the Thermal Performance and Emissions of a Variable Compression Ratio Diesel Engine Fuelled with Karanja Biodiesel and the Optimization of Parameters Based on Experimental Data

Purpose The purpose of this paper is to assess the influence of blends of Jatropha methyl ester (JME) and its nano Al2O3 emulsion on variable compression ratio diesel engine. The oxygen in alumina contributed for the smooth burning and resulted in improved performance and emissions. Design/Methodology/Approach The biodiesel (methyl ester) is prepared from the raw Jatropha oil. The B10, B20 and B30 blends of and their nanoemulsions are prepared with the 25, 50, 75 and 100 ppm of nano Al2O3. The prepared JME blends and its nanoemulsions are tested in a variable compression ratio (VCR) diesel engine to evaluate the engine performance and emission characteristics. Findings The nanoemulsion B20 + 50 ppm has given maximum brake thermal efficiency (BTE), and with the increased proportion of nanoparticle, the BTE was reduced. Also, the specific fuel consumption is lowest (0.2826 kg/kWh) for B20 + 50 ppm at the compression ratio 16.5 and full load which is 4.10% lower than the diesel and 5.8% lower than the B20 blend. As the load increases, NOx emission increases owing to higher peak temperatures in the combustion chamber. The JME-nano Al2O3 emulsion reduces the HC and CO emission compared with all other fuels. Originality/Value Novel nano emulsions are prepared, characterized and tested on VCR engine.

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Multi-objective optimization of performance and emissions characteristics of a variable compression ratio diesel engine running with biogas-diesel fuel using response surface techniques

Energy Sources Part A Recovery Utilization and Environmental Effects ◽

10.1080/15567036.2020.1813847 ◽

2020 ◽

pp. 1-18

Author(s):

Sunil Kumar Mahla ◽

Seyed Mohammad Safieddin Ardebili ◽

Mostafa Mostafaei ◽

Amit Dhir ◽

Geetesh Goga ◽

...

Keyword(s):

Diesel Engine ◽

Response Surface ◽

Compression Ratio ◽

Diesel Fuel ◽

Multi Objective Optimization ◽

Variable Compression Ratio ◽

Multi Objective ◽

Performance And Emissions ◽

Variable Compression

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Determination of Combustion Process Model Parameters in Diesel Engine with Variable Compression Ratio

Journal of Combustion ◽

10.1155/2018/5292837 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 7

Author(s):

Saša Milojević ◽

Radivoje Pešić

Keyword(s):

Diesel Engine ◽

Compression Ratio ◽

Process Model ◽

Internal Combustion Engines ◽

Combustion Process ◽

Exhaust Emission ◽

Model Parameters ◽

Connecting Rod ◽

Variable Compression Ratio ◽

Variable Compression

Compression ratio has very important influence on fuel economy, emission, and other performances of internal combustion engines. Application of variable compression ratio in diesel engines has a number of benefits, such as limiting maximal in cylinder pressure and extended field of the optimal operating regime to the prime requirements: consumption, power, emission, noise, and multifuel capability. The manuscript presents also the patented mechanism for automatic change engine compression ratio with two-piece connecting rod. Beside experimental research, modeling of combustion process of diesel engine with direct injection has been performed. The basic problem, selection of the parameters in double Vibe function used for modeling the diesel engine combustion process, also performed for different compression ratio values. The optimal compression ratio value was defined regarding minimal fuel consumption and exhaust emission. For this purpose the test bench in the Laboratory for Engines of the Faculty of Engineering, University of Kragujevac, is brought into operation.

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