Investigative Studies on Performance Behavior on an IDI diesel engine with a Geometrically Modified Swirl Chamber using Biodiesel Blends

Abstract

In this experimental study, combustion, performance and emission characteristics of conventional swirl chamber (CSC) and geometrically modified swirl chamber (GMSC) of IDI diesel engines were studied. A GMSC was designed and fabricated in a separated engine head, for performance testing and comparison purpose. Biodiesel from chia seed oil was extracted by transesterification process and blended with diesel based on volumetric ratios of 5% to 25%, in steps of 10% increase. The performance and emission characteristics of biodiesel blends were compared with petroleum diesel using the CSC and GMSC. The result shows BTE of biodiesel blend BC05, BC15 and BC25 using the GMSC are 3.18%, 0.21% and 1.19% lesser compared to CSC 75% load. In-cylinder pressure of blends BC05, BC15 and BC25 are 66.3 bar, 59.04 bar and 54.34 bar with GMSC. BSFC of BC05, BC15 and BC25 with GMSC are 2.56%, 9.38% and 11.95% higher compared to diesel due to the low CV of biodiesel. NOx emissions for diesel, BC05, BC15 and BC25 are 9.47%, 18.41%, 6.98% and 1.67% respectively less at 75% load with GMSC compared to CSC. From the performance and emission characteristics blend B15 may be recommended as a promising substitute for petroleum diesel.