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Research Papers

Aerodynamic Performance of Turbine Center Frames With Purge Flows—Part II: The Influence of Individual Hub and Tip Purge Flows

[+] Author and Article Information
Stefan Zerobin

Institute for Thermal Turbomachinery
and Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria
e-mail: stefan.zerobin@tugraz.at

Christian Aldrian, Franz Heitmeir

Institute for Thermal Turbomachinery
and Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria

Andreas Peters

GE Aviation,
Munich 85748, Germany

Emil Göttlich

Institute for Thermal Turbomachinery
and Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria,
e-mail: emil.goettlich@tugraz.at

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 23, 2017; final manuscript received January 16, 2018; published online May 3, 2018. Editor: Kenneth Hall.

J. Turbomach 140(6), 061010 (May 03, 2018) (8 pages) Paper No: TURBO-17-1224; doi: 10.1115/1.4039363 History: Received November 23, 2017; Revised January 16, 2018

The aerodynamic behavior of turbine center frame (TCF) ducts under the presence of high-pressure turbine (HPT) purge flows was experimentally investigated in this two-part paper. While the first part of the paper demonstrated the impact of varying the purge flow rates (PFR) on the loss behavior of two different TCF designs, the second part concentrates on the influence of individual hub and tip purge flows on the main flow evolution and loss generation mechanisms through the TCF ducts. Therefore, measurements were conducted at six different operating conditions in a one and a half stage turbine test setup, featuring four individual purge flows injected through the hub and tip, forward and aft cavities of the HPT rotor. The outcomes of this first-time assessment indicate that a HPT purge flow reduction generally benefits TCF performance. Decreasing one of the rotor case PFRs leads to an improved duct pressure loss. The purge flows from the rotor aft hub and tip cavities are demonstrated to play a particularly important role for improving the duct aerodynamic behavior. In contrast, the forward rotor hub purge flow actually stabilizes the flow in the TCF duct and reducing this purge flow can penalize TCF performance. These particular HPT/TCF interactions should be taken into account whenever high-pressure turbine purge flow reductions are pursued.

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References

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Figures

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Fig. 1

Sketch of the rotor cavities and the flow path of the test turbine

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Fig. 2

Relative purge mass flow rate (top) and cavity temperature (bottom) at different purge flow operating conditions

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Fig. 3

Streamwise vorticity at the TCF inlet (view is A.L.F.)

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Fig. 4

Mass-averaged radial profiles of streamwise vorticity

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Fig. 5

Mass-averaged radial profiles at the TCF inlet (HPT rotor exit)

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Fig. 6

Contour plots of relative duct pressure loss and superimposed secondary flow velocity vectors at the TCF exit (view is A.L.F.)

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Fig. 7

Mass-averaged radial profiles at the TCF exit

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Fig. 8

TCF relative total pressure loss for different purge flow conditions

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