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76131 Karlsruhe 

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TP - A9
Experimentelle Untersuchung der flammenerzeugten Turbulenz bei instationärer Flammenausbreitung

PD Dr. Rainer Suntz
Institut für Technische Chemie und Polymerchemie (TCP)
Engler-Bunte-Institut/Bereich Verbrennungstechnik (EBI-VBT)
Universität Karlsruhe (TH)
Kaiserstraße 12
76128 Karlsruhe
Telefon: +49(0)721/ 608-2110
Telefax: +49(0)721/ 608-4820

Prof. Dr.-Ing. Nikolaos Zarzalis
Engler-Bunte-Institut/Bereich Verbrennungstechnik (EBI-VBT)
Universität Karlsruhe (TH)
Engler-Bunte-Ring 1
76131 Karlsruhe
Telefon: +49(0)721/ 608-4231
Telefax: +49(0)721/ 608-6566

Ergebnisse des Teilprojekts Veröffentlichungen


The main focus of the Collaborative Research Centre 606 is non-stationary combustion in internal combustion engines, combustion chambers or gas turbines. Non-stationary combustion within the mentioned combustion devices inevitably is connected with flame propagation under turbulent conditions. For a comprehensive understanding of turbulent flame propagation detailed experimental investigations are necessary and, particularly, research is still necessary for the determination of the Markstein number during the turbulent unsteady flame propagation as discussed in the review article „Turbulent premixed combustion: Flamelet structure and its effect on turbulent flame velocity” by Driscoll [1]. Motivated by this, the actual research activities during the last period were focussed on the points mentioned in [1].

The flame surface during the non-stationary dispersion under turbulent conditions by means of a newly developed measuring technique has been recorded and quantified applying an adequate evaluation method.

By this data on the flame wrinkling as well as the laminar burning velocity of the stretched flamelets were determined for the first time.

On the basis of this data resulting Markstein numbers were evaluated.

Encouraged by the results it is planned to extend the research work on these topics during the next research period with the main goals:

Investigation of operating conditions existing in internal combustion engines and

Quantifying the stretching of the flamelets.

In order to realise internal combustion engine conditions the ignition has to be performed under elevated pressure and temperature. So, the existing testing facility has to be upgraded. Using the above mentioned new measuring technique the Markstein number during the unsteady flame propagation under elevated pressure and temperature will be determined. Another aspect of implementing the experimental conditions of an Otto engine concerns the proper choice of the fuel. As a further step, in addition to gaseous fuels, it is planned to extend the investigations using liquid fuels as well.

The stretching of the flamelets will be quantified by measuring the flame structure as well as the velocity field using Particle Imaging Velocimetry (PIV). This will bring about useful information concerning the verification of existing models leading to the explanation of the influence of the turbulence on the non-stationary flame propagation. The method will be applied to the evaluation of isochoric combustion in an explosion vessel.

The increase in knowledge obtained by the described investigations is of fundamental relevance for the projects B2, A5, B9(N) and B10(N). The experimental results achieved by project A9 are necessary for the development as well as the validation of models for turbulent burning velocity in subproject B8 and of the combustion models developed within the mentioned projects. Therefore, a close co-operation is already taking place or will be arranged.

[1] J. F. Driscoll, Turbulent premixed combustion: Flamelet structure and its effect on turbulent burning velocities, Progress in energy and Combustion Science 43 (2008) pp. 91-134.

Wissenschaftliche Mitarbeiter: 
Vlade Vukadinovic
Telefon: +49(0)721/608-7147
Telefax: 49(0)721/661501