For smaller droplets, higher initial droplet velocity causes the ignition to occur earlier, whereas for larger droplets, higher initial droplet velocity delays the ignition time.
Methanol addition, which suppresses low-temperature oxidation (LTO) and delays the ignition timing, had no effect on the activation energy obtained from the Arrhenius plot of heat release rate.
It has been demonstrated that a delay of the ignition timing leads to an increase of the gas mixture temperature and cylinder pressure.
We note that the mixing time has a significant influence on the auto-ignition delay time: with increasing mixing time τmix, ignition delay times decrease significantly (the ignition delay time is defined as the time elapsed between τres = 0 s and the sudden increase in OH mass fraction).
To qualitatively demonstrate the overall hypergolic ignition and reactivity, the explosion delay time and the ignition delay times of various combinations of the fuel-oxidizer pairs were determined.
The effects of the Weber number on the explosion delay time and the ignition delay time of [EMIm][DCA]-WFNA are quantitatively investigated.
It was found that fuels which contained the structure -CH2-CH2-CH2 showed two-stage ignition with relatively short ignition delays and that the ignition delay depended strongly on the energy released during the first-stage.
Measurements of reflected shock ignition delays show that the ignition delay times of iC12 are in close agreement with those of the 50/50 molar mixture of iC8/iC16 over a broad range of temperature conditions.
