نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In recent years, natural gas and gasoline blended fuels have been considered as alternative fuels in spark ignition (SI) engines. In order to utilize their potential benefits, a precise identification of those alternative fuels is attractive and inevitable studies to predict their performance in SI engines. In this study, the laminar flame speed of natural gas and gasoline blended fuels in the constant volume chamber at different equivalence ratios of 0.8 to 1.2, via the Schlieren optical method was measured and the un-stretched laminar flame speed by following the theory of the weekly stretched flame was obtained. Direct injectors, were installed at the top of the chamber and were used to inject liquid and gaseous fuels. To ensure that the liquid fuel would evaporate completely, the chamber wall was heated with four band heaters and liquid injection was done in the vacuumed chamber. The result showed that adding the natural gas to the gasoline would increase its flame speed at low equivalence ratio, from 0.8 to 0.95. Adding the natural gas to the gasoline in high equivalence ratio caused the flame instability that originated from cracking and the cellularity of the flame surface occurred at higher equivalence ratio.
کلیدواژهها [English]
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