Ignition delay measurements of diesel and gasoline blends

Abstract

Two blends of diesel and gasoline fuels have been studied in this work for their use in advanced internal combustion engines, such as gasoline compression ignition (GCI) engine. The formulated blends (dieseline blends) have diesel/ gasoline volumetric ratios of 50/50 and 25/75, and have research octane numbers (RON) of 61 and 80, respectively. Experimental studies have been conducted in this work to assess the autoignition characteristics of the dieseline blends. Ignition delay times were measured in a shock tube over wide ranges of experimental conditions (10 and 20 bar, 700 - 1200 K, = 0.5, 1 and 2). Reactivity of the dieseline blends was compared with experimental measurements of multi-component surrogates (MCS). The surrogates captured the reactivity of the dieseline blends quite well over our experimental conditions. Ignition delay times of the dieseline blends were compared with low-octane fuels. The dieseline blends were found to have similar reactivity to fuels with similar octane number in the negative temperature coefficient (NTC) range. However, at high and low temperatures, the dieseline blends appear to be more reactive than the low-octane gasoline fuels.