Abstract
The objective of this study was to understand the effects of fuel chemistry on the combustion properties of blends of Canola Methyl Ester (CME) and petroleum-based No. 2 diesel at different initial equivalence ratios. The fuel was vaporized and injected into a hot air stream and burned as a laminar flame at atmospheric pressure. The equivalence ratio was altered by changing the air flow rate. A pyrheliometer was used to measure the flame radiation and the global emissions of NOx and CO were measured by sampling the combustion products and passing the samples through gas analyzers. The measured radiative heat fraction significantly increased with increasing equivalence ratio. A decrease in the measured radiative heat fraction was observed as the volume percentage of CME was increased in the blend, due to a reduction in the soot content of the flames. It was found that the NOx emissions decreased as the equivalence ratio was increased for all fuels tested. The CME flames produced the highest emission index of NOx, which decreased as the volume percentage of CME was decreased in the fuel blend. In contrast, the CO emissions increased as the equivalence ratio was increased for all fuels tested. The diesel flame produced the highest emission index of CO, which decreased as the volume percentage of CME was increased in the blend.
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