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Many researchers have successfully worked on developing new energy sources from renewable energy. Plant derived Ceiba pentandra and Mahua (CPM) blended biofuels is regarded as a suitable substitute fuel for compression ignition engines. The current study investigates experimentally, the impact of dual biofuel blends with diesel fuel at various compression ratios in a combustion ignition engine. Ceiba pentandra and Mahua biofuels were blended with regular fuel in the proportions of 10, 20, 30, and 40 percent by volume basis. The blended fuels were examined at various compression ratio under optimum loading conditions. The different blended fuels were tested under the compression ratios of 15–19 and the performance parameters were analyzed. Also the entire combustion process along with engine's exhaust pollutants were investigated further. The engine performance characteristics improvised at B20 bio-fuel blend at a compression ratio of 18 with full load conditions. [ABSTRACT FROM AUTHOR]

Modern engines need to produce more efficiency in all aspects with low specific fuel consumption and lesser pollutions for environmental betterment. The purpose of this research work is to experimentally identify better thermal barrier coating and their impacts to enhance engine performance with lower specific fuel consumption. Piston crown of a single-cylinder diesel engine is coated with MgO-ZrO2 and Al2O3-13%TiO2 and tested under different loading conditions. The impact of thermal barrier coating performance and emissions compared with standard diesel engine characteristics is investigated. MgO-ZrO2 and Al2O3-13% TiO2 are selected as additional material to coat the piston crown because these materials are physically stable and thermal properties like low heat conductivity, high melting point and high thermal expansion are stable at high temperature. This experimental work has shown an increase in brake thermal efficiency of 32.1% for the TBC engine from 23.4% for the UC engine. Therefore, there is a decrease in brake-specific fuel consumption for TBC engine 0.27 kg/kWh from uncoated engine 0.37 kg/kWh at 9 kg of load decreased by 27.03%. It was observed from the heat balance sheet that the TBC engine useful work was increased by 3.5% compared with the uncoated engine which ultimately decreases the effect of gases like CO and HC due to an increase in the complete combustion by the thermal barrier coating. [ABSTRACT FROM AUTHOR]

A single cylinder diesel engine was tested under different loading conditions with its piston crown coated with the Thermal Barrier Coating (TBC). The main objective of tliis work is to investigate the effect of the TBC on performance and emission characteristics in the diesel engine. The top surface of the piston was coated with 100 pm thick NiCrAl as lining layer by plasma spray method. A mixture of 88% Yttria stabilized Zirconia, 4% MgO and 8% TiO; of 150 pm thick were coated over the lining layer. Exhaust emission (HC, NOx, CO and CO2) parameters were investigated using AVL exhaust gas analyzer. The results showed that the brake thermal efficiency was increased by 10% and brake specific fuel consumption was decreased by 9.8% for coated piston in comparison with the uncoated piston engine. It was also observed that, smoke, CO and HC emissions were decreased in the TBC engine as compared with the baseline engine. In addition carbon di oxide (CO2) and nitrogen oxide (NOx) emissions were partially increased. [ABSTRACT FROM AUTHOR]

A single cylinder diesel engine was tested under different loading conditions with its piston crown coated with the Thermal Barrier Coating (TBC). The main objective of this work is to investigate the effect of the TBC on performance and emission characteristics in the diesel engine. The top surface of the piston was coated with 100 µm thick NiCrAl as lining layer by plasma spray method. A mixture of 88% Yttria stabilized Zirconia, 4% MgO and 8% TiO2 of 150 µm thick were coated over the lining layer. Exhaust emission (HC, NOx, CO and CO2) parameters were investigated using AVL exhaust gas analyzer. The results showed that the brake thermal efficiency was increased by 10% and brake specific fuel consumption was decreased by 9.8% for coated piston in comparison with the uncoated piston engine. It was also observed that, smoke, CO and HC emissions were decreased in the TBC engine as compared with the baseline engine. In addition carbon di oxide (CO2) and nitrogen oxide (NOx) emissions were partially increased. [ABSTRACT FROM AUTHOR]

The paper describes an experimental methodology devised to study engine block displacement of internal combustion engine in the radial direction due to combustion force. This force produced in the cylinder varies with the chamber profile since flow parameters are influenced by the combustion chamber profile. Combustion effectiveness fluctuates depending upon flow parameters. To correlate between combustion and injection and to detect faults in the injection system it is necessary to supervise the combustion in the individual cylinders. This can be accomplished by evaluating the crankshaft speed at the flywheel. Speed is directly related to combustion by means of indicated pressure and torque. Different combustion chamber profiles were taken for the analysis along with speed and load as the design variables. The displacement and time-domain frequency for all the profiles were compared. The results provide displacement induced by the combustion pressure, uncertainty in combustion processes and nonlinear vibration of the engine block. This new approach in engine parameter design gives insight on the vibrational processes in the case of different chamber profiles as well as sources of noise in the diesel engine. [ABSTRACT FROM AUTHOR]