Spray vaporization and ignition characteristics in dual-component mixed fuels

In this study, the ignition characteristics and vaporization characteristics of a dual-component mixed fuel composed of low boiling temperature (LBT) fuels were investigated experimentally in terms of fuel composition and mass fraction (YLBT) using a constant volume combustion vessel. For this purpose, two groups of mixed fuels were tested: The first group was a mixture of the high boiling temperature (HBT) fuel nC13 as the base fuel and various LBT fuels with similar BTs ranging from 350 to 380 K but with different ignition temperatures (ITs), and second group was a mixture of HBT fuel and various LBT fuels with ITs similar to the IT of nC13 but different BTs. The results indicate that although the type and mass fraction of the LBT fuels in the dual-component mixed fuels were varied, small changes in density did not produce changes in the spray behavior of the fuels, which is described by the spray tip penetration under the no-combustion condition. The ignition delay times for nearly all of the mixed fuels were the same as the delay time of pure nC₁₃ below Y_LBT = 0.5; however, the ignition delay times rapidly increased with the characteristics of the boiling curve diagrams of the mixed fuels.