Noise originating from the core of an aero-engine is challenging to quantify since the understanding of its generation and propagation is less advanced than that for noise sources of other engine components. To overcome the difficulties associated with dynamic measurements in the crowded core region, dedicated experiments have been set up in order to investigate mainly two processes: the propagation of direct combustion noise through the subsequent turbine stage, and the generation of indirect combustion noise by the passage of inhomogeneities of entropy and vorticity through the turbine stage. In the current work, a transonic turbine stage was exposed to isolated and well-characterized acoustic, entropic, and vortical disturbances. The incoming and outgoing sound fields were analyzed in detail by two large arrays of microphones. The mean flow field and the disturbances were carefully mapped by several aerodynamic and thermal probes. The results include transmission and reflection characteristics of the turbine stage, the latter was found to be much lower than commonly assumed. The modal decomposition of the acoustic field in the upstream and downstream section shows additional modes besides the expected rotor–stator interaction modes. At the frequency of entropy or vorticity excitation, respectively, a significant increase of the overall sound power level was observed.
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October 2017
Research-Article
Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage
Karsten Knobloch,
Karsten Knobloch
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: karsten.knobloch@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: karsten.knobloch@dlr.de
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Lars Neuhaus,
Lars Neuhaus
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: lars.neuhaus@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: lars.neuhaus@dlr.de
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Friedrich Bake,
Friedrich Bake
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: friedrich.bake@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: friedrich.bake@dlr.de
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Paolo Gaetani,
Paolo Gaetani
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: paolo.gaetani@polimi.it
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: paolo.gaetani@polimi.it
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Giacomo Persico
Giacomo Persico
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: giacomo.persico@polimi.it
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: giacomo.persico@polimi.it
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Karsten Knobloch
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: karsten.knobloch@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: karsten.knobloch@dlr.de
Lars Neuhaus
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: lars.neuhaus@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: lars.neuhaus@dlr.de
Friedrich Bake
Department of Engine Acoustics,
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: friedrich.bake@dlr.de
Institute of Propulsion Technology,
German Aerospace Center (DLR),
Berlin D-10623, Germany
e-mail: friedrich.bake@dlr.de
Paolo Gaetani
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: paolo.gaetani@polimi.it
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: paolo.gaetani@polimi.it
Giacomo Persico
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: giacomo.persico@polimi.it
Dipartimento di Energia,
Politecnico di Milano,
Milano I-20158, Italy
e-mail: giacomo.persico@polimi.it
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received October 18, 2016; final manuscript received March 23, 2017; published online May 9, 2017. Editor: Kenneth Hall.
J. Turbomach. Oct 2017, 139(10): 101006 (12 pages)
Published Online: May 9, 2017
Article history
Received:
October 18, 2016
Revised:
March 23, 2017
Citation
Knobloch, K., Neuhaus, L., Bake, F., Gaetani, P., and Persico, G. (May 9, 2017). "Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage." ASME. J. Turbomach. October 2017; 139(10): 101006. https://doi.org/10.1115/1.4036344
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