Vortex Breakdown Types and Global Modes in Swirling Combustor Flows with Axial Injection

Autor:	Kilian Oberleithner, Steffen Terhaar, Thoralf G. Reichel, Lothar Rukes, Christian Oliver Paschereit, Christina Schrödinger
Rok vydání:	2015
Předmět:	Hydrodynamic stability Materials science Mechanical Engineering Mass flow Aerospace Engineering Inflow Mechanics Vortex Fuel Technology Particle image velocimetry Space and Planetary Science Combustor Combustion chamber Simulation Large eddy simulation
Zdroj:	Journal of Propulsion and Power. 31:219-229
ISSN:	1533-3876 0748-4658
DOI:	10.2514/1.b35217
Popis:	This paper presents the results of a combined experimental, numerical, and analytical study of the occurrence of different vortex breakdown types and helical instabilities in realistic swirling combustor flows with axial air injection through a centerbody. A parametric study of the isothermal flowfield inside the combustion chamber and in the mixing tube upstream of the combustor is carried out in a water-tunnel test facility. Selected configurations were further assessed under reacting conditions. Next, a large-eddy simulation was conducted and successfully validated with the experimental data. The isothermal and reacting results show a strong effect of the inflow parameters on the type of the vortex breakdown and the frequency, amplitude, and shape of the global mode. Linear local hydrodynamic stability analyses, carried out on the time-average measured and simulated velocity data, yield the absolutely unstable domain inside the flowfield. Axial injection is shown to impede a zone of absolute instabilit...
Databáze:	OpenAIRE
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