1D Raman/Rayleigh-scattering and CO-LIF
measurements in laminar and turbulent jet flames of
dimethyl ether using a hybrid data reduction strategy.
Technische Universität, Darmstadt
[Ph.D. Thesis], (2011)
Available under Creative Commons Attribution Non-commercial No Derivatives, 2.5.
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|Item Type:||Ph.D. Thesis|
|Title:||1D Raman/Rayleigh-scattering and CO-LIF measurements in laminar and turbulent jet flames of dimethyl ether using a hybrid data reduction strategy|
In the present work, "Raman/Rayleigh scattering and CO-LIF measurements in laminar and turbulent jet flames of dimethyl ether using a hybrid data reduction strategy", the development of a hybrid data reduction strategy for spectroscopic, laser-based measurements of combustion products and reactants in laminar and turbulent flames of distinct fuels is presented.
The objective of this thesis was to merge two existing data evaluation procedures into a hybrid method to take advantage of the strengths of each method. Subsequently, the developed strategy had to be extended to provide flexibility for the investigated fuel.
The following main topics were addressed: Measurement data were taken in close cooperation with the Combustion Research Facility, Sandia National Laboratories, in Livermore, California, to provide the base for quantitative comparison of both distinct data reduction processes. For that purpose, the method "Spectral Fitting" used at the Institute Reactive Flows and Diagnostics, was adapted on the special characteristics of the experimental setup in Livermore and was used to evaluate the data. At the same time, the "Hybrid method" was developed from combining of the Spectral Fitting with the "Matrix inversion" method from Livermore. In this, the quantum mechanical models essential in the Spectral fitting for the calculation of spectroscopic characteristics of the measured molecules were adopted for the Matrix inversion method to reduce extensive calibrations and measurement uncertainties. Subsequently, during a two-month research stay in Livermore, the results of all three methods were compared and discussed. Meanwhile, new measurement data were taken to study the combustion of complexer hydrocarbons beyond methane (dimethyl ether, ethylene, ethane, propane). After the research stay, new strategies had to be developed to allow for the data evaluation of the aforementioned fuels.
The hybrid method was validated experimentally by well-known measurement objects. With the aid of numerical combustion simulation tools, new strategies for evaluating the measured Raman/Rayleigh scattering of hydrocarbons beyond methane were developed. Then, these were validated in laminar jet flames of dimethyl ether. First test measurements in turbulent dimethyl ether flames were performed, and also with the new method evaluated and presented.
|Place of Publication:||Darmstadt|
|Uncontrolled Keywords:||Raman Spektroskopie, Dimethylether, Ethan, Ethen, Methan, Raman Wirkungsquerschnitt, Rayleigh Wirkungsquerschnitt, Matrix Inversion, Spectraler Crosstalk, Differentielle Diffusion, Laminare 1D Rechnungen|
|Classification DDC:||500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
|Divisions:||16 Department of Mechanical Engineering > Institute for Energy and Power Plant Technology (EKT)|
|Date Deposited:||27 Oct 2011 10:29|
|Last Modified:||07 Dec 2012 12:01|
|Referees:||Dreizler, Prof. Dr. Andreas and Sick, Prof. Dr. Volker|
|Refereed:||14 June 2011|