On Turbulence Measurements and Analyses in a Two-Stage Two-Spool Turbine Rig

Bauinger, Sabine; Behre, Stephan; Lengani, Davide; Guendogdu, Yavuz; Heitmeir, Franz; Goettlich, Emil

doi:10.1115/1.4035508

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…Therefore, for the calculation of the turbulence kinetic energy k reliable estimations on the fluctuations in radial direction were needed. For this, turbulence measurements with a CTA system, performed by Bauinger et al [7] inside a two-stage configuration in our test rig, were analyzed and the ratio of the radial fluctuations to the mean of the axial and circumferential fluctuations was evaluated. In a plane after the turning strut of the turbine center frame, the average ratio was 1.08 with a standard deviation of 0.4.…”

Section: Test Facility and Experimental Datamentioning

confidence: 99%

Unsteady Simulation of a Transonic Turbine Stage with Focus on Turbulence Prediction

Sanz

Scheier

2021

IJTPP

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The flow in a transonic turbine stage still poses a high challenge for the correct prediction of turbulence using an eddy viscosity model. Therefore, an unsteady RANS simulation with the k-ω SST model, based on a preceding study of turbulence inlet conditions, was performed to see if this can improve the quality of the flow and turbulence prediction of an experimentally investigated turbine flow. Unsteady Q3D results showed that none of the different turbulence boundary conditions could predict the free-stream turbulence level and the maximum values correctly. Luckily, the influence of the boundary conditions on the velocity field proved to be small. The qualitative prediction of the complex secondary flows is good, but there is lacking agreement in the prediction of turbulence generation and destruction.

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Section: Test Facility and Experimental Datamentioning

confidence: 99%

Unsteady Simulation of a Transonic Turbine Stage with Focus on Turbulence Prediction

Sanz

Scheier

2021

IJTPP

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Impact of Varying High- and Low-Pressure Turbine Purge Flows on a Turbine Center Frame and Low-Pressure Turbine System

Sterzinger

Zerobin

Merli

et al. 2020

Journal of Turbomachinery

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This paper presents the experimental and numerical evaluation and comparison of the different flow fields downstream of a turbine center frame duct and a low-pressure turbine stage, generated by varying the inlet flow conditions to the turbine center frame duct. The measurements were carried out in an engine-representative two-stage two-spool test turbine facility at the Institute for Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. The rig consists of a highpressure (HPT) and a low-pressure (LPT) turbine stage, connected via a turbine center frame (TCF) with non-turning struts. Four individual high-pressure turbine purge flow rates and two low-pressure turbine purge flow rates were varied to achieve different engine-relevant TCF and LPT inlet flow conditions. The experimental data was acquired by means of five-hole-probe area traverses upstream and downstream of the TCF, and downstream of the LPT. A steady RANS simulation taking all purge flows in account was used for comparison and additional insight are gained from a numerical variation of the HPT and LPT purge flow rates. The focus of this study is on the impact of the variations in TCF inlet conditions on the secondary flow generation through the TCF duct and the carry-over effects on the exit flow field and performance of the LPT stage.

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Unsteady Flow Interactions Between a High- and Low-Pressure Turbine

Sterzinger

Zerobin

Merli

et al. 2020

Journal of Turbomachinery

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This two-part paper presents the unsteady flow interactions between an engine-representative high-pressure turbine (HPT) and low-pressure turbine (LPT) stage, connected by a turbine center frame (TCF) duct with non-turning struts. The setup was tested at the high-speed two-spool test turbine facility at the Institute for Thermal Turbomachinery and Machine Dynamics at Graz University of Technology and includes relevant purge and turbine rotor tip leakage flows. Due to the complexity of such a test, the unsteady component interactions in an HPT-TCF-LPT module have not received much attention in the past and require additional analysis to determine new approaches for further performance improvements on the system level. The flow downstream of an HPT is highly unsteady and dominated by statorrotor interactions, which affect the flow behavior through the downstream TCF and LPT. To capture the unsteady flow structures, time-resolved aerodynamic measurements were carried out with a fast-response aerodynamic pressure probe (FRAPP) at three different measurement planes. In this first part of the paper, the time-resolved and phase-averaged flow fields with respect to the HPT and LPT trigger are studied. Since the two rotors are uncorrelated, the applied method allows the identification of the flow structures induced by either of them. Upstream of the LPT stage, the HPT flow structures evolving through the TCF duct dominate the flow fields.

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On Turbulence Measurements and Analyses in a Two-Stage Two-Spool Turbine Rig

Cited by 5 publications

References 21 publications

Unsteady Simulation of a Transonic Turbine Stage with Focus on Turbulence Prediction

Unsteady Simulation of a Transonic Turbine Stage with Focus on Turbulence Prediction

Impact of Varying High- and Low-Pressure Turbine Purge Flows on a Turbine Center Frame and Low-Pressure Turbine System

Unsteady Flow Interactions Between a High- and Low-Pressure Turbine

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