The development of measurement techniques, which enable temporal and spatial highly resolved density investigations even in harsh environments, is essential. Rayleigh scattering is a noninvasive optical measurement technique permitting such investigations. A Rayleigh-scattering measurement system is set up, providing a new insight into fluid mechanical processes in turbomachines. In this paper, Rayleigh scattering is used for the detection of density oscillations in the optical accessible convergent-divergent outlet nozzle of a small scale combustion test rig at various power consumptions and equivalence ratios. Until now, this part of the combustion chamber is sparsely investigated due to the challenging measurement conditions. The temporal density oscillation inside the nozzle can be shown up to 4 kHz as well as its spatial distribution. Systematic errors of the setup are investigated. Spectra of pressure and density oscillations are compared. Measurements with nonreacting air flow are conducted to study flow induced density fluctuations. Entropy noise related correlations between density and pressure fluctuations are found. Therewith, the builtup Rayleigh-scattering system enables investigations of the presumed region of indirect noise generation.
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March 2011
Research Papers
Measurements of Density Pulsations in the Outlet Nozzle of a Combustion Chamber by Rayleigh-Scattering Searching Entropy Waves
Anne Rausch,
Anne Rausch
Department of Engine Acoustics, Institute of Propulsion Technology,
e-mail: anne.rausch@dlr.de
German Aerospace Center
, 10623 Berlin, Germany
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Andre Fischer,
Andre Fischer
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
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Holger Konle,
Holger Konle
Institute of Fluid Mechanics,
Technische Universität Berlin
, 10623 Berlin, Germany
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Andrea Gaertlein,
Andrea Gaertlein
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
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Steffen Nitsch,
Steffen Nitsch
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
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Karsten Knobloch,
Karsten Knobloch
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
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Friedrich Bake,
Friedrich Bake
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
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Ingo Röhle
Ingo Röhle
Department of Turbine, Institute of Propulsion Technology,
German Aerospace Center
, 37073 Göttingen, Germany
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Anne Rausch
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germanye-mail: anne.rausch@dlr.de
Andre Fischer
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
Holger Konle
Institute of Fluid Mechanics,
Technische Universität Berlin
, 10623 Berlin, Germany
Andrea Gaertlein
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
Steffen Nitsch
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
Karsten Knobloch
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
Friedrich Bake
Department of Engine Acoustics, Institute of Propulsion Technology,
German Aerospace Center
, 10623 Berlin, Germany
Ingo Röhle
Department of Turbine, Institute of Propulsion Technology,
German Aerospace Center
, 37073 Göttingen, GermanyJ. Eng. Gas Turbines Power. Mar 2011, 133(3): 031601 (9 pages)
Published Online: November 10, 2010
Article history
Received:
April 15, 2010
Revised:
May 6, 2010
Online:
November 10, 2010
Published:
November 10, 2010
Citation
Rausch, A., Fischer, A., Konle, H., Gaertlein, A., Nitsch, S., Knobloch, K., Bake, F., and Röhle, I. (November 10, 2010). "Measurements of Density Pulsations in the Outlet Nozzle of a Combustion Chamber by Rayleigh-Scattering Searching Entropy Waves." ASME. J. Eng. Gas Turbines Power. March 2011; 133(3): 031601. https://doi.org/10.1115/1.4002018
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