An experimental investigation into combustion characteristics of HVO compared with TME and ULSD at varied blend ratios

摘要

The combustion characteristics of hydro-treated vegetable oil (HVO), tallow methyl ester (TME), and their blends with ultra-low sulphur diesel (ULSD) have been investigated using a Combustion Research Unit (CRU). Generally, HVO has the shortest ignition delay and the longest combustion duration due to the highest cetane number. For all the tested fuels, the ignition delay decreased with increased ULSD content and increasing ambient pressure could lengthen the combustion duration. The combustion duration of neat HVO increased with ambient temperature. Whereas with HVO30, TME and their blends, all the combustion durations initially deceased until they reached their lowest at 560 degrees C, and then they increased when the ambient temperature was further increased. It is believed the shortest combustion duration is the transition of the combustion regime from mainly premixed combustion to mainly diffusion combustion and the temperature around 560 degrees C is the transition point for HVO30, TME100 and its blends with ULSD in the test conditions.