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1D Raman/Rayleigh-scattering and CO-LIF measurements in laminar and turbulent jet flames of dimethyl ether using a hybrid data reduction strategy

Fuest, Frederik (2011):
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, [Online-Edition: urn:nbn:de:tuda-tuprints-27739],
[Ph.D. Thesis]

Abstract

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.

Item Type: Ph.D. Thesis
Erschienen: 2011
Creators: Fuest, Frederik
Title: 1D Raman/Rayleigh-scattering and CO-LIF measurements in laminar and turbulent jet flames of dimethyl ether using a hybrid data reduction strategy
Language: English
Abstract:

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.

Uncontrolled Keywords: Raman Spektroskopie, Dimethylether, Ethan, Ethen, Methan, Raman Wirkungsquerschnitt, Rayleigh Wirkungsquerschnitt, Matrix Inversion, Spectraler Crosstalk, Differentielle Diffusion, Laminare 1D Rechnungen
Divisions: 16 Department of Mechanical Engineering > Institute for Energy and Power Plant Technology (EKT)
16 Department of Mechanical Engineering
Date Deposited: 27 Oct 2011 10:29
Official URL: urn:nbn:de:tuda-tuprints-27739
License: Creative Commons: Attribution-Noncommercial-No Derivative Works 3.0
Referees: Dreizler, Prof. Dr. Andreas and Sick, Prof. Dr. Volker
Refereed / Verteidigung / mdl. Prüfung: 14 June 2011
Alternative keywords:
Alternative keywordsLanguage
Raman spectroscopy, dimethyl ether, ethane, ethylene, methane, Raman cross section, Rayleigh cross section, matrix inversion, spectral crosstalk, differential diffusion, laminar 1D calculationsEnglish
Alternative Abstract:
Alternative abstract Language
Die vorliegende Arbeit, "Raman/Rayleigh scattering and CO-LIF measurements in laminar and turbulent jet flames of dimethyl ether using a hybrid data reduction strategy", behandelt die Entwicklung einer hybriden Auswerteroutine für spektroskopische, laserbasierte Messungen von Verbrennungsprodukten und -edukten an unterschiedlichen Brennstoffen in laminaren und turbulenten Flammen. Ziel der Arbeit war es, zwei bestehende Auswerteverfahren zusammenzuführen, und die jeweiligen Stärken der einzelnen Methoden in einem hybriden Ansatz zu vereinen. In einem darauffolgenden Schritt sollte das entwickelte Verfahren erweitert werden, um Flexibilität bezüglich des untersuchten Brennstoffs zu ermöglichen. Dabei wurden im Wesentlichen folgende Aspekte behandelt: In enger Zusammenarbeit mit der Forschungsgruppe der Combustion Research Facility, Sandia National Laboratories, in Livermore, Kalifornien, wurden Messdaten aufgenommen, die zunächst zum quantitativen Vergleich der beiden unterschiedlichen Auswerte-verfahren herangezogen wurden. Hierzu musste die am Fachgebiet Reaktive Strömungen und Messtechniken eingesetzte Methode des "Spektralen Fits" auf die experimentellen Besonderheiten der Messanlage in Livermore angepasst und angewendet werden. Parallel dazu wurde die "Hybride Methode" aus dem Zusammenschluss von der in Livermore eingesezten Methode der "Matrix Inversion" und dem Spektralen Fit entwickelt. Hierbei galt es, die im Spektralen Fit eingesetzten quantemmechanischen Modelle zur Berechnung der spektroskopischen Eigenschaften der gemessenen Moleküle für die Matrix Inversion nutzbar zu machen, um dort vorhandenen hohen Kalibrationsaufwand und damit verbundene Messunsicherheiten zu reduzieren. Im Anschluss wurden während eines zweimonatigen Forschungsaufenthaltes in Livermore die Ergebnisse aller drei Methoden miteinander verglichen und diskutiert. Währenddessen wurden vor Ort neue Messdaten zur Erforschung der Verbrennung komplexerer Kohlenwasserstoffe als Methan (Dimethylether, Ethen, Ethan, Propan) aufgenommen. Zur Auswertung dieser Messungen, mussten im Anschluss an den Forschungsaufenthalt neue Auswertestrategien entwickelt werden, um die Hybride Methode auch für die zuvor genannten Brennstoffe einsetzbar zu machen. Die Hybride Methode wurde experimentell anhand wohlbekannter Messobjekte validiert. Unter Zuhilfenahme von numerischen Verbrennungssimulationswerkzeugen wurden neue Strategien zur Auswertung der gemessenen Raman/Rayleigh-Streuung komplexerer Kohlenwasserstoffe an laminaren Dimethyletherflammen entwickelt, und in entsprechenden laminaren Jet-Flammen eingesetzt und überprüft. Erste Testmessungen in turbulenten Dimethyletherflammen wurden durchgeführt, und ebenfalls mit der neuen Methode ausgewertet und präsentiert.German
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