Abstract
In-situ spatial soot and temperature distributions were investigated experimentally for B20 (20% v/v butanol and balance mineral diesel blend), vis-a-vis mineral diesel using endoscopic visualization. Endoscopy captured in-cylinder combustion images in a production-grade direct injection compression ignition (DICI) engine at varying engine operating points. A comparative combustion data analysis using pressure-crank angle history, and the captured endoscopic images was performed, and an attempt was made to correlate the results of these two experimental investigations. Combustion duration (CD) obtained from the endoscopic images was found to be relatively long compared to CD calculated from the thermodynamic analysis. The majority of the research on soot and NOx emitted from an engine using a raw exhaust gas emission analyser provides bulk, time-averaged, and cycle-averaged information about the pollutant formation. This investigation is unique wherein the spatial or time-resolved soot and NOx formation (Via spatial temperature distribution) is evaluated and the findings of this study support the research finding available in the open literature, which uses emission analyser. This study and the technique therein on deployment of engine endoscopy as an emerging optical technique is potentially useful to original automotive manufactures (OEM's) in designing more efficient engines to meet upcoming stringent emission norms.
Measurement methods in marine engine endoscopy