Abstract
A correlation to estimate the fuel ignition delay of a diesel engine operating with blends of straight soybean oil and diesel oil is proposed. Ignition delay measurements were carried out on a dynamometer bench using a 14.7 kW/2200 rpm single-cylinder compression ignition engine fueled with blends of 0%, 50%, 80% and 100% v/v straight soybean oil in commercial diesel oil (S10). The injection and ignition angles were determined from the second derivative of the in-cylinder pressure curve. A correlation was developed expressing the ignition delay data as a function of the droplet Reynolds number, global fuel/air equivalence ratio, in-cylinder gas temperature, and volume fraction of soybean oil. The non-dimensional parameters are obtained from the dimensions of the injector nozzle, liquid fuel and in-cylinder gas properties to generalize the applicability to other vegetable oils and engine operating conditions. The coefficient of determination (R2) of the curve-fit was 0.8465 for a 95% confidence interval. Finally, a sensitivity analysis showed a significant influence of the in-cylinder gas temperature and volume fraction of soybean oil on the ignition delay.
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