Experimental study of autoignition characteristics of Jet-A surrogates and their validation in a motored engine and a constant-volume combustion chamber

The measured derived cetane number (DCN) for UM I shows a reasonably good match with the practical Jet-A fuel (POSF 4658), while gas-phase oxidation behavior is less, well-matched in the modified CFR engine. In contrast, although the measured DCN of UM II revealed a lower value than the estimated value using a surrogate optimizer, the ignition behavior is relatively well match with that of the target Jet-A in the modified CFR engine. The similarities in physical and chemical ignition delays as compared with the target Jet-A support the effectiveness of the UM II surrogate, while in contrast, the UM I surrogate only matched the chemical ignition delay. This is attributed to the importance of the surrogate component decalin, which improved the physical properties as compared to MCH, while the other three components were the same for the two surrogates.