Abstract
Modeling the chemical reactions and soot processes in kerosene flames is important to support the design of future generations of low-emission aircraft engines. To develop and validate these models, detailed experimental data from model flames with well-defined boundary conditions are needed. Currently, only few data from experiments with real aircraft engine fuels are available. This paper presents measurements of temperature, species and soot volume fraction profiles in premixed, flat flames using Jet A-1 kerosene and a two-component surrogate blend. Measurements were performed using a combination of TDLAS, GC and laser extinction. The results show that the flame structure in terms of temperature and species profiles of the kerosene and surrogate flames are very similar but differ greatly in the resulting soot volume fractions. Furthermore, the study shows that the available chemical mechanisms can correctly predict the temperature profiles of the flames but show significant differences from the experimentally observed species profiles. The differences in the sooting tendency of the kerosene and the surrogate are further investigated using detailed chemical mechanisms.
Highlights
In addition to the soot models, the correct calculation of species and temperatures profiles of such flames is of great importance and the chemical mechanism used to calculate the combustion processes can have a large impact on the results of soot modeling attempts [10]
The scope of this study is to contribute to the available data on flame structure and soot volume fraction in premixed kerosene flames
Soot volume fraction was measured at several heights above the burner (HAB) with laser extinction [26]
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In addition to the soot models, the correct calculation of species and temperatures profiles of such flames is of great importance and the chemical mechanism used to calculate the combustion processes can have a large impact on the results of soot modeling attempts [10]. The scope of this study is to contribute to the available data on flame structure and soot volume fraction in premixed kerosene flames. The flame structure was assessed by determining the main species concentrations and temperature along the axis of a premixed flat flame burning either kerosene Jet A-1 or a n-decane/1,2,4 trimethylbenzene surrogate mixture. The soot volume fraction was measured using laser extinction The combination of these techniques resulted in a comprehensive dataset that can be used in the future to develop detailed reaction mechanisms for kerosene flames including soot precursors and soot formation. The influence of different surrogate blends on the formation of soot precursors was numerically investigated
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