Results of an investigation show that the effects of additives on the ignition delays of liquid fuel droplets impinging on a hot surface correlate satisfactorily with their effects on the cetane ratings of diesel fuels. It is also shown that additives for diesel fuels may be divided into three categories according to their effects on the above mentioned ignition delays, viz. (1) those that reduce the ignition delay at all dosages, (2) those that reduce the ignition delay at small dosages but increase it at high dosage and (3) those that do not have any significant effect on the ignition delay.
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