Browsing by Author "Dhananjaya, D.A."

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Combustion and emission characteristics of di compression ignition engine operated on jatropha oil methyl ester with different injection parameters
(2009) Dhananjaya, D.A.; Sudhir, C.V.; Mohanan, P.
The current paper reports the engine performance, combustion and emissions from a direct injection compression ignition engine operated with different injector opening pressure (IOP) and injection timing (IT) with jatropha oil methyl ester (JOME) (B100), B20 (20% biodiesel and 80% petroleum diesel fuel which are generally called of B20 fuel) and diesel as test fuels. The engine was run on three different IOP viz. 180, 220 and 240bar along with normal IOP 200bar and two IT viz. 20deg. bTDC and 26deg. bTDC along with normal IT 23deg. bTDC. For all IOP and IT tried, the performance parameters such as brake thermal efficiency (BTE), brake specific energy consumption (BSEC), combustion parameters such as peak cylinder pressure, peak heat release rate and ignition delay and emissions such as UBHC, smoke opacity and NOx are reported here. From the experimental investigations it is observed that IOP 220bar and IT 26deg. bTDC showed better performance for all the test fuels. On the other hand, the performance, combustion and emission characteristics of B20 blend fueled direct injection compression ignition engine performed better for entire load range of operation. At higher loads with IOP 220bar and IT 26deg. bTDC emissions such as smoke opacity and UBHC were observed to be lower compared to other IOPs and ITs. But, NOx emission at retard IT 20deg. bTDC was very low compared to other two ITs. BTE of blend B20 fueled compression ignition engine has increased by 1.01% when operated with IOP 220bar at IT 23deg. bTDC and 1.34% with IT 26deg. bTDC at IOP 200bar. On other hand blend B20 fueled direct injection compression ignition engine showed better performance with reasonable higher brake thermal efficiency and lower BSEC, better combustion and emission when compared to biodiesel (B100) and diesel fuel.
COMBUSTION and EMISSION CHARACTERISTICS of DIESEL, B100 and B20 FUEL on A THERMAL BARRIER COATING on PISTON CROWN in DIRECT INJECTION C.I. ENGINE at OPTIMUM IOP and IT
(2009) Dhananjaya, D.A.; Mohanan, P.; Sudhir, C.V.
The objective of this study is to investigate the performance, combustion and emission characteristics of Jatropha biodiesel and its blend fueled in standard CI engine (without coating piston crown) and thermal barrier coating (with coating of piston crown) CI engine at optimum injector opening pressure (IOP) and injection timing (IT). Tests were performed on a single cylinder, four stroke, direct injection, water cooled, CI engine whose piston crown were coated with a 300?m thickness of zirconium oxide over a 150?m thickness of nickel chromium and aluminum oxide bond coat at optimum IOP and IT (220 bar and 26� btdc). The working conditions for the standard and thermal barrier coating of piston crown CI engine were kept exactly the same to ensure a realistic comparison between the two configurations of the engine. During this investigation, both the engine was fueled with the diesel fuel, biodiesel and its blend of biodiesel and neat diesel fuel in proportions of 20% biodiesel and 80% diesel fuel which are generally called of B20 fuel. In this work various performance parameters such as brake thermal efficiency, brake specific energy consumption, combustion characteristics such as peak cylinder pressure, peak heat release rate, ignition delay and emission parameter such as UBHC, smoke opacity and NOx under varying load conditions are studied and recorded. The test results indicate that performance, combustion and emission characteristics of the B20 fueled with thermal barrier coating CI engine for all load range has improved. At full load at B20 fuel, emissions such as UBHC and smoke opacity were observed to be lower compared to the standard CI engine. The thermal efficiency and specific energy consumption of B20 fueled at full load conditions of thermal barrier coating CI engine has increased approximately by 1.96% and decreased approximately by 4.2% respectively when compared to standard CI engine. � Copyright 2009 SAE International.
COMBUSTION and EMISSION CHARACTERISTICS of DIESEL, B100 and B20 FUEL on A THERMAL BARRIER COATING on PISTON CROWN in DIRECT INJECTION C.I. ENGINE at OPTIMUM IOP and IT
(SAE International, 2009) Dhananjaya, D.A.; Mohanan, P.; Sudhir, C.V.
The objective of this study is to investigate the performance, combustion and emission characteristics of Jatropha biodiesel and its blend fueled in standard CI engine (without coating piston crown) and thermal barrier coating (with coating of piston crown) CI engine at optimum injector opening pressure (IOP) and injection timing (IT). Tests were performed on a single cylinder, four stroke, direct injection, water cooled, CI engine whose piston crown were coated with a 300Î¼m thickness of zirconium oxide over a 150Î¼m thickness of nickel chromium and aluminum oxide bond coat at optimum IOP and IT (220 bar and 26Â° btdc). The working conditions for the standard and thermal barrier coating of piston crown CI engine were kept exactly the same to ensure a realistic comparison between the two configurations of the engine. During this investigation, both the engine was fueled with the diesel fuel, biodiesel and its blend of biodiesel and neat diesel fuel in proportions of 20% biodiesel and 80% diesel fuel which are generally called of B20 fuel. In this work various performance parameters such as brake thermal efficiency, brake specific energy consumption, combustion characteristics such as peak cylinder pressure, peak heat release rate, ignition delay and emission parameter such as UBHC, smoke opacity and NOx under varying load conditions are studied and recorded. The test results indicate that performance, combustion and emission characteristics of the B20 fueled with thermal barrier coating CI engine for all load range has improved. At full load at B20 fuel, emissions such as UBHC and smoke opacity were observed to be lower compared to the standard CI engine. The thermal efficiency and specific energy consumption of B20 fueled at full load conditions of thermal barrier coating CI engine has increased approximately by 1.96% and decreased approximately by 4.2% respectively when compared to standard CI engine. Â© Copyright 2009 SAE International.
Combustion characteristics of diesel engine operating on jatropha oil methyl ester
(Serbian Society of Heat Transfer Engineers, 2010) Dhananjaya, D.A.; Sudhir, C.V.; Mohanan, P.
Fuel crisis because of dramatic increase in vehicular population and environmental concerns have renewed interest of scientific community to look for alternative fuels of bio-origin such as vegetable oils. Vegetable oils can be produced from forests, vegetable oil crops, and oil bearing biomass materials. Non-edible vegetable oils such as jatropha oil, linseed oil, mahua oil, rice bran oil, karanji oil, etc., are potentially effective diesel substitute. Vegetable oils have reasonable energy content. Biodiesel can be used in its pure form or can be blended with diesel to form different blends. It can be used in diesel engines with very little or no engine modifications. This is because it has combustion characteristics similar to petroleum diesel. The current paper reports a study carried out to investigate the combustion, performance and emission characteristics of jatropha oil methyl ester and its blend B20 (80% petroleum diesel and 20% jatropha oil methyl ester) and diesel fuel on a single-cylinder, four-stroke, direct injections, water cooled diesel engine. This study gives the comparative measures of brake thermal efficiency, brake specific energy consumption, smoke opacity, HC, NOx, ignition delay, cylinder peak pressure, and peak heat release rates. The engine performance in terms of higher thermal efficiency and lower emissions of blend B20 fuel operation was observed and compared with jatropha oil methyl ester and petroleum diesel fuel for injection timing of 20° bTDC, 23° bTDC and 26° bTDC at injection opening pressure of 220 bar.
Effect of bio-diesel (B20) on performance and emissions of optimum injector opening pressure operating at different injection timings of a semi-adiabatic engine
(2009) Dhananjaya, D.A.; Sudhir, C.V.; Mohanan, P.
This study was carried out to investigate the performance and emission characteristics of jatropha methyl ester oil and its blend B20 with mineral diesel on a single-cylinder four-stroke direct injection water cooled diesel engine operated at optimum IOP 220bar at different injection timing of standard and semi-adiabatic engine. The results of comparative measures of brake thermal efficiency, smoke and NOx have been presented and discussed on both the types of engines. The engine performance in terms of higher thermal efficiency and lower emissions of B20 blend fuel operation was observed and compared with jatropha methyl ester oil and mineral diesel fuel of 20o bTDC, 23o bTDC and 26o bTDC of standard and semi-adiabatic engine. � 2009 Combustion Institute. All rights reserved.
Effect of bio-diesel (B20) on performance and emissions of optimum injector opening pressure operating at different injection timings of a semi-adiabatic engine
(Combustion Institute, 2009) Dhananjaya, D.A.; Sudhir, C.V.; Mohanan, P.
This study was carried out to investigate the performance and emission characteristics of jatropha methyl ester oil and its blend B20 with mineral diesel on a single-cylinder four-stroke direct injection water cooled diesel engine operated at optimum IOP 220bar at different injection timing of standard and semi-adiabatic engine. The results of comparative measures of brake thermal efficiency, smoke and NOx have been presented and discussed on both the types of engines. The engine performance in terms of higher thermal efficiency and lower emissions of B20 blend fuel operation was observed and compared with jatropha methyl ester oil and mineral diesel fuel of 20o bTDC, 23o bTDC and 26o bTDC of standard and semi-adiabatic engine. Â© 2009 Combustion Institute. All rights reserved.
EFFECT of INJECTION PRESSURE and INJECTION TIMING on A SEMI-ADIABATIC CI ENGINE FUELED with BLENDS of JATROPHA OIL METHYL ESTERS
(2008) Dhananjaya, D.A.; Mohanan, P.; Sudhir, C.V.
A naturally aspirated four stroke single cylinder CI engine was modified to run as semi-adiabatic CI engine. The effect of different injection pressure and injection timing of a standard and semi-adiabatic engine on the combustion performance and emission characteristics of jatropha oil methyl ester (JOME) and its volume blends with diesel is presented in this paper. Performance of the CI engine was evaluated in terms of brake specific energy consumption, brake thermal efficiency, exhaust gas temperature and exhaust gas composition. Five different volume blends of JOME viz. B5, B10, B15, B20 and B25 was used for the combustion studies at various injection pressures viz. 180, 200, 220 and 240 bar and also at different injection timings i.e. 22�,27� and 32� btdc. This experimental study focused on deriving an optimal injection timing and pressure for the satisfactory operation of JOME blends in a semi-adiabatic engine. The study revealed that acceptable brake thermal efficiency, brake specific energy consumption and emission characteristics of the engine were obtained up to B25 of JOME. At injector opening pressure of 220bar, B20 blend fuel showed better combustion performance and lower exhaust emissions compared to other blends and diesel fuel. At this combination the specific energy consumption were 11.67 MJ/kW-hr and brake thermal efficiency were 30.87% for a semi-adiabatic engine, while the same for standard engine (Non Coated), was found to be 12.60 MJ/kW-hr and 28.67% respectively. At full load, with injection timing of 32� btdc and with B20 JOME blend fuel showed the specific energy consumption of 11.52 MJ/kW-hr and thermal efficiency of 31.72% for semi-adiabatic engine, while for standard engine same was found to be 12.21 MJ/kW-hr and 29.28% respectively. This infers that the semi-adiabatic engine showed better combustion than the standard engine. � 2008 SAE International.
EFFECT of INJECTION PRESSURE and INJECTION TIMING on A SEMI-ADIABATIC CI ENGINE FUELED with BLENDS of JATROPHA OIL METHYL ESTERS
(SAE International, 2008) Dhananjaya, D.A.; Mohanan, P.; Sudhir, C.V.
A naturally aspirated four stroke single cylinder CI engine was modified to run as semi-adiabatic CI engine. The effect of different injection pressure and injection timing of a standard and semi-adiabatic engine on the combustion performance and emission characteristics of jatropha oil methyl ester (JOME) and its volume blends with diesel is presented in this paper. Performance of the CI engine was evaluated in terms of brake specific energy consumption, brake thermal efficiency, exhaust gas temperature and exhaust gas composition. Five different volume blends of JOME viz. B5, B10, B15, B20 and B25 was used for the combustion studies at various injection pressures viz. 180, 200, 220 and 240 bar and also at different injection timings i.e. 22Â°,27Â° and 32Â° btdc. This experimental study focused on deriving an optimal injection timing and pressure for the satisfactory operation of JOME blends in a semi-adiabatic engine. The study revealed that acceptable brake thermal efficiency, brake specific energy consumption and emission characteristics of the engine were obtained up to B25 of JOME. At injector opening pressure of 220bar, B20 blend fuel showed better combustion performance and lower exhaust emissions compared to other blends and diesel fuel. At this combination the specific energy consumption were 11.67 MJ/kW-hr and brake thermal efficiency were 30.87% for a semi-adiabatic engine, while the same for standard engine (Non Coated), was found to be 12.60 MJ/kW-hr and 28.67% respectively. At full load, with injection timing of 32Â° btdc and with B20 JOME blend fuel showed the specific energy consumption of 11.52 MJ/kW-hr and thermal efficiency of 31.72% for semi-adiabatic engine, while for standard engine same was found to be 12.21 MJ/kW-hr and 29.28% respectively. This infers that the semi-adiabatic engine showed better combustion than the standard engine. Â© 2008 SAE International.