Multi-wavelength speciation of high-temperature alternative and conventional jet fuel pyrolysis

摘要

Developing theoretical models for jet fuel combustion requires experimental studies into the cracking patterns of fuels at high temperatures. The current study extends a recently developed multi-wavelength speciation strategy to enable measurement of species formation from the pyrolysis of two jet fuels, Jet A and Gevo ATJ. This method combines the use of shock tubes, laser absorption spectroscopy, and convex optimization to enable high-bandwidth species mole fraction measurements for eight species. In total, eight wavelengths are used to probe the rapidly-changing high-temperature spectra of pyrolyzing jet fuel. Absorbance measurements, in combination with a high-temperature absorption cross-section database are used to calculate the time-resolved composition of the reactive mixture. This approach is possible because of the recent development of a multi-wavelength speciation framework, supporting spectroscopic database of high-temperature absorption cross-sections, and demonstration of the current method during pyrolysis of a smaller hydrocarbon. The method described here will support further investigation of different jet fuels across a wider experimental domain.