Apurba Layek

Performance of a Direct Injection Diesel Engine Using Jatropha Diesel Blends as Fuel

Jatropha bio diesel blended with mineral diesel in proportion 2:1 by volume is used to conduct performance test and emission characteristics of a single cylinder direct injection diesel engine. Jatropha-diesel blend is used to perform engine performance and emission tests at variable loads & throttle settings (25%, 50%, 75% and 100%). Observed data were utilized to obtain various performance parameters such as brake power, brake specific fuel consumption, brake thermal efficiency at various loads and throttle settings. Simultaneously observations were also made to obtain exhaust gas temperatures and exhaust emissions (CO, CO2, HC and NOx). In existing engine diesel provides higher and economic power generating capacity for entire operating ranges but effect of varying load /throttle on performance behavior were fantastically similar. Reduced HC and NOx emission with the blend also better, highlights some positive aspects of combustion and allowance for higher compression ratio with the blend.

Performance Evaluation of Solar Air Heater Having Chamfered Rib Groove Roughness on Absorber Plate

A parametric study of artificial roughness geometry in the form of chamfered rib groove type on the underside of absorber plate of solar air heater has been carried out and compared with smooth duct. The performance evaluation in terms of energy augmentation ratio (EAR), effective energy augmentation ratio (EEAR) and exergy augmentation ratio (EXAR) has been carried out for various values of roughness parameters of chamfered rib groove roughness for a wide range of temperature rise parameter. It is found that the augmentation ratios increase with temperature rise parameter in the order of EAR, EEAR and EXAR. The artificially roughened solar air heater duct performs better as per EAR or EEAR for any values of temperature rise parameter and roughness parameters. The EAR is high for the parameters of chamfered rib groove type roughness geometry which create more turbulence, however the pump work required for flow of air also increase. The EXAR is a more suitable criterion to incorporate the quality of heat c...

Performance characteristics of CI engine using blends of waste cooking oil methyl ester, ethanol and diesel

ABSTRACT The main emphasis of this work is to explore the biodiesel obtained from waste cooking oil and its utilisation in CI engine blended with ethanol and conventional diesel. Waste cooking oil methyl esters (WCOME) was prepared by transesterification with a heterogeneous catalyst such as CaO. Diesel and WCOME blends of five different proportions with 5% of ethanol uniformly added to them were used as a fuel in a variable compression ratio, constant speed, compression ignition engine. The performance, emission and combustion characteristics of the engine at part and full load conditions were compared with that of neat diesel, varying the compression ratio from 18 to 22. From the experimental results, the blend comprising 20% waste cooking oil, 5% ethanol and 75% mineral diesel showed ameliorated performance and emission characteristics, compared with all the other fuel blends at an optimum compression ratio of 21.