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A04: Simulation of pulsed combustion under increased pressure

Principal investigators:
Prof. Dr. rer. nat. Julius Reiss ()

Scientist:  Mario Sroka, M.Sc. ()
phone   (030) 314 21131    

Summary

This project investigates the influence of the operation conditions on the detonative combustion and on its initiation. The robustness of the initiation as a transition from deflagration to detonation is essential for a reliably application in a gas turbine. The variable operation conditions have to be reflected in the thermodynamical and kinetic modeling. To this non-constant heat capacities and a detailed kinetic are used, which also benefits the reliability of the simulation.

1st Funding period 2012 - 2016

Numerical study of the physics of pressure increased pulsating combustion

Principal investigator:
Prof. J. Sesterhenn ()

Summary

The goal of this project is the detailed numerical study of the physics of the pressure increasing, pulsating combustion in pulsed detonation combustors and shockless explosion combustors. The project gives insight into the physical processes of corresponding combustion chambers by high-resolution simulations and data assimilation. The project examines the filling process of the combustion chambers and system-relevant phenomenas in detail, in order to stabilize and improve the overall process.

Different aspects of the deflagration to detonation transition (DDT) shall be investigated in this project. One important aspect is the Richtmyer-Meshkov-Instability. This instability occurs if the interface of two fluids with different density interacts with a shock.

Lupe

The Richtmyer-Meshkov-Instability was simulated with and without combustion. The interface between cold (yellow) and hot (black) is distorted because of the instability and the typical fungus shape arises. The figure on the left shows the instability without and the one on the right with combustion. The upper ones show the density, the lower ones the vorticity. There are fewer small structures in the density due to the combustion. But in comparison with the vorticity it can be seen that the turbulent structures exist in both simulations.

More aspects of the DDT and a simulation of the whole tube shall be investigated during the project to get a better understanding of the combustion and an operative combustion chamber.

Formation of the preheating zone adjacent to the flame and transition to detonation in a semi-infinite two-dimensional channel with adiabatic no-slip boundaries. The initial conditions are set to a laminar premixed flame of stoichiometric Hydrogen-Air at
Lupe

Publications

Bengoechea, S., L. Stein, J. Reis and J. Sesterhenn. Numerical investigation of reactive and non-reactive Richtmeyer-Meshkov instabilities. In R. King, ed., Active Flow and Combustion Control 2014, vol 127 of NNFM, 343-361. Springer International Publishing, 2015.

Zusatzinformationen / Extras

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Auxiliary Functions

Speaker

Prof. Dr.-Ing. Dieter Peitsch

Managing director

Steffi Stehr
Room ER 102

Office

Steffi Stehr
sec. ER 2-1
Room 107
Hardenbergstr. 36a
10623 Berlin
+49 (30) 314 23110