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Volume 1, Issue 6 December 2013

S.No. Title Page No.
01
Comparative studies on Exhaust Emissions and Combustion Characteristics of four stroke copper coated spark ignition engine with alcohol blended gasoline with catalytic converter
Author: K. Kishor, M.V.S. Murali Krishna and P.V.K. Murthy
Abstract: Experiments were conducted to control exhaust emissions and determine combustion characteristics of four stroke variable compression ratio, variable speed, single cylinder, spark ignition (SI) engine, with alcohol blended gasoline (80% gasoline, 10% methanol, 10% ethanol by volume) having copper coated combustion chamber [CCCC, copper-(thickness, 300 μ) coated on piston crown, inner side of cylinder head] provided with catalytic converter with sponge iron as catalyst and compared with conventional SI engine (CE) with pure gasoline operation. Exhaust emissions (carbon mono oxide (CO) and unburnt hydro carbons (UBHC) were evaluated at different values of brake mean effective pressure. Combustion characteristics (peak pressure, maximum rate of pressure rise and time of occurrence of peak pressure and maximum heat release) were determined at full load operation of the engine. A microprocessor-based analyzer was used for the measurement of CO/UBHC in the exhaust of the engine. Combustion characteristics were determined by special software package. Copper coated combustion chamber with alcohol blended gasoline considerably reduced pollutants in comparison with CE with pure gasoline operation. Catalytic converter with air injection significantly reduced pollutants with test fuels on both configurations of the combustion chamber. The catalyst, sponge reduced the pollutants effectively with both test fuels in both versions of the combustion chamber.
001-009
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02
Influence of cryogenic treatment on the friction coefficient of nylon 6 and caprolactam - graphite composite
Author: K. S. Mahesh Lohith, V. B. Sondur and V. V. Sondur
Abstract: Cryogenic treatment is an effective treatment process to enhance the hardness and wear resistance of some metal parts under rubbing conditions. Earlier studies have revealed the reduction in friction as an after effect of cryogenic treatment in metals. Although friction and wear resistance enhancement in tool steels is important for tribological applications, never the less, some polymers are found to be very suitable under certain tribological environments. Thus it is very important to enhance the tribological properties of certain useful polymers and polymer composites. In addition, some of the polymers and polymer composites are self lubricating. Thus any technique or process involved in enhancing the wear resistance and reducing friction is welcome. The present study is intended to investigate the effect of cryogenic treatment on the friction of polymer and polymer composite material parts.
010-015
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03
Economic impact on the operation of Associate in nursing electrical network
Author: Ram Kumar Singh
Abstract: Power electrical device outages have a substantial economic impact on the operation of Associate in Nursing electrical network. so as to draw most power from transformers and, at constant time, avoid thermal mishaps, it's essential to fastidiously study its thermal behavior. what is more, Associate in Nursing correct computation of the most popular spot temperature (HST) helps in an exceedingly realistic estimation of the dependableness and remaining lifetime of the electrical device winding insulation. This paper presents temperature distribution of an influence the electrical device layer-type winding exploitation conjugated heat transfer analysis, so energy and Navier-Stokes equations area unit solved exploitation finite distinction technique. Meanwhile, the consequences of load conditions and sort of oil area unit investigated exploitation the model. Oil within the electrical device is assumed nearly incompressible and oil parameters like thermal conduction, special heat, viscosity, and density vary with temperature. Comparison the results with those obtained from finite integral remodel checks the validity and accuracy of the planned technique.
016-022
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