Showing papers by "Ujjwal K. Saha published in 2011"
TL;DR: In this article, the authors investigated a syngas-diesel dual fueled diesel engine operation under varying load conditions from the second law point of view, and revealed that increasing the hydrogen quantity of synggas increases the cumulative work availability and reduces the destroyed availability.
75 citations
27 citations
01 May 2011
TL;DR: In this article, the unsteady free-surface velocities during the surge motion of a liquid tank are determined through experimental investigation, and a new experimental approach has been discussed for cap...
Abstract: In this work, the unsteady free-surface velocities during the surge motion of a liquid tank are determined through experimental investigation. A new experimental approach has been discussed for cap...
25 citations
TL;DR: In this paper, the authors evaluated the performance of a biogas with jatropha bio-diesel as an ignition source in a compression ignition diesel engine at six different loads under dual fuel mode.
Abstract: The objective of this work is to review state of art practices and potential in diesel engines using greener fuels. Biogas with jatropha bio-diesel as ignition source was tested in a compression ignition diesel engine at six different loads under dual fuel mode. With a simple modification, the base engine was qualified to a dual fuel operation. For all the loads evaluated, dual fuel mode achieved a possible bio-diesel substitution of about 65%. In addition, it consumed lesser friction power as compared to the diesel mode during the operation. There were reductions in thermal efficiency, cylinder peak pressure and combustion noise under the dual fuel operation than the diesel mode due to lower burning velocity of biogas together with a longer pilot delay. However, this operation registered extremely lower NOx levels at all loads along-with reduced CO emissions at medium and higher loads. While significant increases in hydrocarbon emissions were observed.
7 citations
01 Jan 2011
TL;DR: In this article, the effect of compression ratio variation on POME run in diesel engine was analyzed and it was shown that at higher compression ratio, POME causes reduction in brake fuel consumption and thereby increases the engine efficiency.
Abstract: Palm Oil Methyl Ester (POME) is a very promising alternative renewable biofuel. This is because it has a better cetane number and a comparable lower calorific value with respect to its competitors. However, due to difference in molecular composition and hence dissimilar properties, it does not perform proficiently in diesel engine with standard design and operating parameters. Therefore, a study is arranged to realize the effect of compression ratio variation on POME run in diesel engine. The load is varied from ‘no load’ to ‘full load’ with six equal intervals. During this study, standard diesel injection timing is maintained unaffected. The study conveys that at higher compression ratio, POME causes reduction in brake fuel consumption and thereby increases the engine efficiency. The increase in compression ratio also causes smoother combustion, lower ignition delay with early heat release than diesel operation. The detrimental emission quantities in the form of carbon monoxide, oxides of nitrogen and hydrocarbon emissions are also cut down with presence of POME in the diesel engine at high compression ratio. Thus, POME can be regarded as a good alternative fuel for diesel engine for locomotive applications.Copyright © 2011 by ASME
6 citations