Abstract
Experiments of high temperature pyrolysis and soot formation analysis on JP-10, one of the representatives of fuels, were conducted in order to analyze its properties and help construct its chemical kinetic mechanism. High-temperature pyrolysis and fuel-rich oxidation experiments were carried out on JP-10 fuel under different conditions using two types of shock tube equipment (SPST and HPST). The pyrolysis experiments were carried out in two working conditions with JP-10 concentrations of 200 ppm and 500 ppm (in Ar). Quantitative analyses of JP-10 pyrolysis products were carried out using gas chromatography, and a total of eight small molecule products below C4 were detected. Among these eight products, methane, ethene, and acetylene were the three main products. In the fuel-rich oxidation experiments for soot formation analysis, a total of nine working conditions were designed, but soot formation was detected only under three of them. The soot induction delay time and soot yield of JP-10 were investigated using laser absorption measurement. The SYmax (the maximum amount of soot yield) and other relevant parameters were investigated under these three different working conditions. At a pressure of 3 bar and a temperature of 1884.10 K, the soot yield reached a maximum of 14.3. In addition to practical insights from these data, they were also useful for the construction and validation of the chemical kinetic mechanism of JP-10.
Highlights
This experiment was completed at the Shock Tube Library at the North University of China (NUC), and the authors investigated the high-temperature pyrolysis characteristics of JP-10, an aviation fuel, as well as its soot yield, an important characteristic for hydrocarbon fuels, by experimentally investigating its soot-induction delay time
The experiments were conducted using an single-pulse shock tube (SPST) combined with gas chromatography to investigate the pyrolysis of JP-10 fuel at a pressure of 5 bar and at concentrations of 200 ppm and 500 ppm, respectively (Ar dilution, 5000 ppm Kr as internal standard gas)
Among the three main products, the concentrations of methane and ethene rarely depended on the concentration of JP-10 in the initial reactant, but the concentration of acetylene was very closely related to the concentration of JP-10, which was only 330 ppm at a JP-10 concentration of 200 ppm, and it could reach more than 550 ppm when the concentration of JP-10 reached 500 ppm
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The pyrolysis of 20,000 ppm C2–C6 1-olefins at a pressure of 2 bar and a temperature range of 900–1800 K was investigated by Shashank and Jinhu et al [13] using a single-pulse excitation tube, and the reactants, intermediates and products were analyzed using gas chromatography–mass spectrometry (GC–MS) analysis The results of this experiment were used to validate the NUIGMech 1.0 chemical kinetic mechanism, and a comparison between the simulated data and predicted major species was satisfactory. Zhong [23] experimentally studied the laminar flame speeds of JP-10, and constructed a chemical kinetic model for JP-10 combustion, which was composed of 189 substances and 1287 reactions The author verified this by using the measured experimental results of laminar flame speeds and a large number of literature data (including the ignition delay time of oxidation and pyrolysis product distribution in a JP-10 shock tube). The results of the experimental studies on the soot-induction delay time and soot yield will provide reference data for methods to reduce carbon soot emissions in practice for JP-10 fuel
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