Noise generation and propagation for different turning mid turbine frame setups in a two shaft test turbine

Faustmann, Christian; Zerobin, Stefan; Marn, Andreas; Spitalny, Mirko; Broszat, Dominik; Göttlich, Emil

doi:10.2514/6.2014-3348

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…A detailed description of the microphone array which is used for the acoustic measurement is presented in Faustmann et al 6 The microphone array was designed by the Department of Engine Acoustics of the DLR Institute of Propulsion Technology according to the guidelines described in Tapken and Enghardt. 7 The challenge was to optimize the microphone arrangement with regard to the limited installation space and the frequency range of interest.…”

Section: Measurement Technique and Data Acquisitionmentioning

confidence: 99%

“…Due to an increased uniformity of the flow field with reduced strut wakes and secondary vortices, an improvement of the overall LP stage performance can be achieved with this embedded design. For more details on the design and aerodynamics of this setup the reader can refer to Spataro et al 2,3 Measurement technique and data acquisition A detailed description of the microphone array which is used for the acoustic measurement is presented in Faustmann et al 6 The microphone array was designed by the Department of Engine Acoustics of the DLR Institute of Propulsion Technology according to the guidelines described in Tapken and Enghardt. 7 The challenge was to optimize the microphone arrangement with regard to the limited installation space and the frequency range of interest.…”

Section: Test Setupsmentioning

confidence: 99%

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On the acoustics of a turning mid turbine frame with embedded design in a two-stage test-turbine

Faustmann

Zerobin

Spataro

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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The paper deals with the investigation of the noise generation in the two-stage two-spool test turbine located at the Institute for Thermal Turbomachinery and Machine Dynamics (ITTM) at Graz University of Technology. The facility is a continuously operating cold-flow open-circuit plant which is driven by pressurized air. The flow path is formed by a transonic turbine stage (high pressure, HP) followed by a low pressure (LP) turbine stage consisting of a turning mid turbine frame and a counter-rotating LP rotor. Downstream of the low pressure turbine the measurement section is instrumented with acoustic sensors. The acquisition system consists of a fully circumferentially traversable microphone array located at the outer casing. Two configurations of turning mid turbine frames were tested. The baseline is an intermediate turbine duct with 16 turning struts. The second one is a new embedded concept for the turning mid turbine frame with two zero-lift splitters placed in the struts' passages. In total 48 vanes (16 struts plus 32 splitter vanes) guide the flow from the HP rotor to the LP rotor. In order to determine the noise emission of both configurations the microphones signal spectra and the emitted sound power level are compared. The acoustic field is characterized by azimuthal and radial modes by means of a microphone array traversed over 360 . In the multi-splitter configuration, the overall sound power level depending on the blade passing frequency of the HP turbine is reduced by 7 dB and depending on the blade passing frequency of the LP turbine by 4 dB, respectively. The overall effect is a reduction of the acoustic emission for the turning mid turbine frame with embedded design.

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Section: Measurement Technique and Data Acquisitionmentioning

confidence: 99%

Section: Test Setupsmentioning

confidence: 99%

On the acoustics of a turning mid turbine frame with embedded design in a two-stage test-turbine

Faustmann

Zerobin

Spataro

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…A detailed description of the microphone array, which is used for the acoustic measurement, is presented in Faustmann et al (2014). The microphone array was designed by the Department of Engine Acoustics of the DLR Institute of Propulsion Technology according to the guidelines described in Tapken and Enghardt (2006).…”

Section: Measurement Technique and Data Acquisitionmentioning

confidence: 99%

Influence of Operational Geometry Changes on Turbine Acoustics

Bauinger¹,

Zerobin²,

Marn³

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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Due to the fact that noise emitted by aero engines became a very important issue especially during the last few years, acoustic measurements were carried out downstream of the lowpressure turbine in a two-stage two-spool test turbine. The aim of these analyses was to determine the influence of small geometry changes in the flow path of the rig under enginerelevant conditions, which usually occur during the operation of an engine. These geometry changes include steps in the flow path and different rotor tip gaps, both generated by a nonuniform warming of different parts of the engine. In order to evaluate the noise emissions, the outflow duct downstream of the second rotor was instrumented with an acoustic measurement section, which uses a circumferentially traversable microphone array located at the outer endwall. The acoustic field is characterized by azimuthal modes gained by traversing the microphone array over 360 degrees. Therefore, the spectra and emitted sound pressure levels are compared regarding different geometry changes.

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Numerical and Experimental Results of a Turning Mid Turbine Frame with Embedded Design in terms of Acoustic Mode Analysis

Zerobin¹,

Bader²,

Faustmann

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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Noise generation and propagation for different turning mid turbine frame setups in a two shaft test turbine

Cited by 3 publications

References 15 publications

On the acoustics of a turning mid turbine frame with embedded design in a two-stage test-turbine

On the acoustics of a turning mid turbine frame with embedded design in a two-stage test-turbine

Influence of Operational Geometry Changes on Turbine Acoustics

Numerical and Experimental Results of a Turning Mid Turbine Frame with Embedded Design in terms of Acoustic Mode Analysis

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