Systematische Brennstoffuntersuchungen mittels quasi-simultaner CRD- und LIF-Spektroskopie (English shop)

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The combustion of fossil fuels covers global primary energy consumption and thus constitutes an essential prerequisite for the functioning and development of our modern society. Limited raw materials and pollutant formation call for a better understanding of these multifaceted processes from ecological and economic perspectives.

Within this framework, a new experimental setup for quasi-simultaneous absorption and fluorescence measurements is presented for use in flame diagnostics, in order to gain a deeper understanding of the complex combustion processes through systematic investigations. The laser diagnostic methods focus on highly sensitive cavity ring-down spectroscopy (CRDS) and laser-induced fluorescence spectroscopy (LIF) with superior spatial resolution. The presented setup enables efficient and systematic measurements and stands out through its exploitation of the advantages of both complementary techniques.

In addition to the instrumental work, the systematic detection of minority species forms the second focus of this thesis. Particular emphasis is placed on the spatially resolved quantification of reaction-controlling intermediates and on temperature determination in four different fuels. The selected fuels cover various areas of modern combustion research, ranging from the alternative “biofuel” ethanol through mechanistic considerations based on methane to the investigation of soot formation processes. The database of a total of 16 characterised flames is used for extensive trend analyses and comparisons with simulations.

This work makes a substantial contribution to the understanding of flame chemistry while also providing important impulses in the field of combustion diagnostics.