Stability and Sensitivity Analysis of Hydrodynamic Instabilities in Industrial Swirled Injection Systems

[+] Author and Article Information
Thomas Ludwig Kaiser

Institut de Mécanique, des Fluides de Toulouse, UMR CNRS/INP-UPS 5502, Toulouse, 31400, France

Thierry Poinsot

Institut de Mécanique, des Fluides de Toulouse, UMR CNRS/INP-UPS 5502, Toulouse, 31400, France

Kilian Oberleithner

Chair of Fluid Dynamics, Technische Universität Berlin, Berlin, 10623, Germany

1Corresponding author.

ASME doi:10.1115/1.4038283 History: Received July 28, 2017; Revised August 22, 2017


The hydrodynamic instability in an industrial, two-staged, counter-rotative, swirled injector of highly complex geometry is under investigation. Large eddy simulations show that the complicated and strongly nonparallel flow field in the injector is superimposed by a strong precessing vortex core. Mean flow fields of large eddy simulations, validated by experimental particle image velocimetry measurements are used as input for both local and global linear stability analysis. It is shown that the origin of the instability is located at the exit plane of the primary injector. Mode shapes of both global and local linear stability analysis are compared to a dynamic mode decomposition based on large eddy simulation snapshots, showing good agreement. The estimated frequencies for the instability are in good agreement with both the experiment and the simulation. Furthermore, the adjoint mode shapes retrieved by the global approach are used to find the best location for periodic forcing in order to control the precessing vortex core.

Copyright (c) 2017 by ASME
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