Effect of n-Pentanol addition to methanol-diesel blends on combustion stability, knock, performance and emission characteristics of diesel engine
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Date
2021-12, 2021-12
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G. B. Pant University of Agriculture and Technology, Pantnagar
Abstract
The present study investigates the influence of n-pentanol addition to diesel/methanol blends on diesel engine performance, combustion, knock, and emission characteristics at different loading conditions. The experiments were performed for diesel and five different test fuels namely MnP5 (5% methanol+5% n-pentanol+90% diesel), MnP10 (10% methanol+10% n-pentanol+80% diesel), MnP15 (15% methanol+15% npentanol+80% diesel), MnP20 (20% methanol+20% n-pentanol+60% diesel) and MnP25 (25% methanol+25% n-pentanol+50% diesel). Performance characteristics were evaluated by using a fuel consumption test. Moreover, combustion and knock characteristics were evaluated based on in-cylinder pressure measurement and heat release analysis. Further, combustion stability analysis was conducted by using statistical and wavelet methods. The peak pressure data series was used for statistical and wavelet analysis. The results indicate that n-pentanol can stabilize the diesel-methanol blend and improve the properties of npentanol-methanol-diesel blends. The brake thermal efficiency for all test fuels and exhaust gas temperature for all test fuels was higher than that of the diesel. Longer ignition delay was observed for all the blends except MnP5 at lower load conditions, while shorter ignition delay was observed at high load conditions. Further, the ignition delay was increased with the increase in methanol and n-pentanol percentage in the test fuel blends. The peak pressure and rate of heat release for all the blends except Mn25 were higher than that of diesel at high load conditions. Knock, and ringing intensities for MnP5 were found to be higher than diesel at all loads. NOx emission for all the blends was lower than diesel at all loading conditions, while HC and smoke emission for MnP5 and MnP10 was lower than diesel at high load conditions. CO emission was found to be higher than diesel for all the blends at all loading conditions. Furthermore, coefficient of variation (COV), wavelet power spectrum (WPS), and global wavelet spectrum (GWS) power indicate that MnP25 exhibits very high cyclic variation.