Combustion and emission characteristics of a rapid compression-expansion machine operated with N-heptanol-methyl oleate biodiesel blends
2020
EL-Seesy, Ahmed I. | Kayatas, Zafer | Hawi, Meshack | Kosaka, Hidenori | He, Zhixia
In the current study, the n-heptanol is mixed with methyl oleate biodiesel fuel at different blends which are 10%, 20% and 40% (by volume) n-heptanol+90%, 80%, 60% methyl oleate fuel (H10B, H20B, and H40B) to examine the combustion and exhaust emission characteristics of a rapid compression-expansion machine (RCEM). The RCEM is operated under diesel engine condition with fixed inlet air properties. The findings for methyl oleate show that the peak pressure is slightly reduced, while soot and NOx emissions are reduced by about 60% and 3% respectively compared to pure diesel fuel. Furthermore, the blending of n-heptanol with methyl oleate fuel leads to a considerable reduction in the soot emission by about 75% and the NOx emission is reduced by 6% compared to pure methyl oleate fuel. The flame images confirm that there is a reduction in flame temperatures for methyl oleate compared to pure diesel fuel. Additionally, the combustion process is retarded with increasing the blending ratio of n-heptanol in the fuel mixture. Based on the combustion and emission characteristics, the recommended blending ratio of n-heptanol and methyl oleate fuel is H20B.
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