Shock Tube Study of JP-10 Ignition Delay Time

Abstract

JP-10 (exo-tetrahydrodicyclopentadiene, C10H16) ignition delay times were measured in a preheated shock tube. The vapor pressures of the JP-10 were measured directly by using a high-precision vacuum gauge, to remedy the difficulty in determining the gaseous concentrations of heavy hydrocarbon fuel arising from the adsorption on the wall in shock tube experiments. The whole variation of pressure and emission of the OH or CH radicals were observed in the ignition process by a pressure transducer and a photomultiplier with a monochromator. The emission of the OH or CH radicals was used to identify the time to ignition. Experiments were performed over the pressure range of 151-556 kPa, temperature range of 1000-2100 K, fuel concentrations of 0.1%-0.55% mole fraction, and stoichiometric ratios of 0.25, 0.5, 1.0 and 2.0. The experimental results show that for the lower and higher temperature ranges, there are different dependency relationships of the ignition time on the temperature and the concentrations of JP-10 and oxygen.

JP-10 combustion studied with shock tube experiments and modeled with automatic reaction mechanism generation

“…The Mikolaitis et al dataset has the fastest ignition delays, as expected from a higher feed concentration (1.48 mol% JP-10). The apparent activation energy of ignition (the slope of the correlation) for the Wang et al [10] ignition delay data appears to be smaller than the for the other datasets. The discrepancies between these datasets may be due to slight differences in the ignition delay metrics employed, as well as accuracy of the JP-10 concentration measurements.…”

“…Four experimental datasets for JP-10 ignition delay can be found in literature [7][8][9][10]. The summary of the experimental conditions and ignition delay measurement metrics can be found in Table 3.…”

“…Temperature range (K) Pressure range (atm) Equivalence ratios (U) Bath gas Ignition delay metric Colket and Spadaccini [8] 1250-1500 3-7 0.5-1.5 Ar Initial rise onset in OH ⁄ emission Davidson et al [7] 1300-1700 1-6 0.5-2.0 Ar Peak CH ⁄ emission Mikolaitis et al [9] 1200-2000 10-25 1.0 N 2 Peak CH ⁄ emission Wang et al [10] 1000-2100 1.5-5. [41] and found that the OH concentration is primarily sensitive to C 2 oxidation reactions.…”

“…They also found that JP-10's ignition delays were generally insensitive to fuel additives. More recently, Wang et al [10] reassessed ignition delays for JP-10 at pressures of 1.5-5.5 atm and temperatures ranging from 1000 to 2100 K to fill gaps between the other datasets.…”

Survey of high-enthalpy shock facilities in the perspective of radiation and chemical kinetics investigations

“…There is a different facilities operated at the Chinese Academy of Sciences in Beijing that are used for aerothermodynamics and combustion applications [131]. Among them the JF-10 and the JF-12 (see Fig.…”