Comparison of properties of a compression ignition engine operating on diesel–biodiesel blend with methanol additive

Abstract This article shows the research results and the analysis of the engine properties of diesel fuel, rape seed methyl ester and methanol (M). In the test two blends, 30 V/V% biodiesel (FAME, B30) and 30 V/V% FAME with 10 V/V% methanol (M, B30 + M10) were investigated compared to the reference diesel fuel (D). These properties were researched using an Audi 1.9 TDI 1Z compression ignition (diesel) engine loaded in wide range BMEP  = 0.236–1.203 MPa ( M B  = 36–179 N m) and 4 speed regimes in range n  = 2000–3500 min −1 . The change of energy and ecology properties during engine work on different fuels was analysed as well dQ / dφ max and dp / dφ max for the assessment of thermal and mechanical load of engine parts. While BSCF increased up to 3.5% for B30 and varied in range of 2–13% for B30 + 10M the BTE increased 1–2% and 2–2.5% respectively. The part of ecology indicators improved by adding M to B30: high engine loads characterized by 2–13% reduced CO and whole engine load range – 13–45% reduced concentration of soot. However emission rates of NO X , HC and CO 2 were close to or higher than reference diesel fuel (D). Research of thermal and mechanical load criteria (values of dQ / dφ max and dp / dφ max ) showed that the additive of M to B30 blend has no such a strong effect as expected.

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