Abstract
A study on forced ignition characteristics of RP-3 jet fuel-air mixture was conducted around a constant volume combustion vessel and a nanosecond pulsed plasma discharge power supply. Experiments were carried out at different initial pressures (pu = 0.2, 0.3, 0.5 atm), equivalence ratios (ϕ = 0.7, 0.8, 1.1), steam concentrations (ZH2O = 0%, 10%, 15%) and oxygen concentrations (ZO2 = 13.5%, 16%, 21%). The relationship between ignition probability and ignition energy is investigated. The experimental results show that the decrease in pressure, equivalence ratio, oxygen concentration and the increase in steam concentration all lead to an increase in minimum ignition energy (MIE). In order to further analyze the experimental data, one existing fitting equation is reformed with the initial conditions taken into account. Multivariate fitting is carried out for different conditions, and the fitting results of ignition probability are in good agreement with the experiments. The MIE results under different experimental conditions are figured out with the new fitting equation. The impact indexes, which stand for the effects of different factors, are also calculated and compared in present work.
Highlights
Development of the aero engine is aimed at powerful thrust, high reliability and economic efficiency
In order to explore the effect of initial pressure on the ignition probability, all the other parameters of the mixture are fixed, among which the steam concentration and other parameters of the mixture areand fixed, among the steam ratio concentration andThe oxoxygen concentration are set as 0%
The results show that as the initial pressure decreases, the ignition probability of of the same ignition energy decreases rapidly
Summary
Development of the aero engine is aimed at powerful thrust, high reliability and economic efficiency. To achieve these goals, proper organization and accurate control of the combustion in chamber are indispensable. Vukadinovic et al [4] measured the laminar flame speed and the Markstein length of the Jet-A using a spherical flame at temperatures of 373–473 K, pressures of 1–8 atm and verified mechanisms for kerosene. Ignition delay times of Jet-A and JP-8 were measured [5,6] with nitrogen dilution in a heated shock tube at temperatures of 715–1229 K, pressures of 17.3–50.9 atm, contribute to propose a correlation equation a surrogate model was verified. Kahandawala et al [7] measured the ignition delay times and soot emissions of JP-8 with Ar dilution and compared the results of JP-8 with its surrogate
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