Abstract
This work develops a new surrogate fuel for RP-3 kerosene. Based on five optimizing targets (molecular weight, hydrogen/carbon ratio, cetane number, lower heating value and threshold sooting index) to emulate the chemical and physical properties of RP-3 kerosene, the surrogate fuel was determined to contain 22% n-dodecane, 15% iso-cetane, 48% decalin and 15% 1,2,4-trimethylbenzene. The laminar burning velocities of RP-3 kerosene and its surrogate fuel were investigated at the unburnt temperature of 413, 443, 473, 503 K, pressure of 1, 2, 5 bar and equivalence ratio of 0.6 ∼ 1.6 in a constant volume combustion bomb. The results show that the laminar burning velocities of the surrogate fuel were in good agreement with that of RP-3 kerosene. Meanwhile, a kinetic model was adopted, which well predicted the laminar burning velocities of RP-3 kerosene and the surrogate fuel. Finally, the flame propagation process and flame instability of RP-3 kerosene under elevated temperatures and pressures conditions were analyzed. It was found that the surrogate fuel was slightly different from RP-3 kerosene in terms of the combustion instability under fuel-rich conditions.
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