Research Papers: Gas Turbines: Heat Transfer

Structural Deflection's Impact in Turbine Stator Well Heat Transfer

[+] Author and Article Information
Julien Pohl

School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
e-mail: jul.pohl@gmx.de

Harvey M. Thompson

Professor of Computational Fluid Dynamics
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK

Antonio Guijarro Valencia, Gregorio López Juste

Universidad Politécnica de Madrid,
Madrid 28040, Spain

Vincenzo Fico, Gary A. Clayton

Thermo-Fluid Systems,
Rolls-Royce plc.,
Derby DE24 8BJ, UK

Contributed by the Heat Transfer Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 29, 2016; final manuscript received August 9, 2016; published online October 18, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(4), 041901 (Oct 18, 2016) (10 pages) Paper No: GTP-16-1290; doi: 10.1115/1.4034636 History: Received June 29, 2016; Revised August 09, 2016

In the most evolved designs, it is common practice to expose engine components to main annulus air temperatures exceeding the thermal material limit in order to increase the overall performance and to minimize the engine-specific fuel consumption (SFC). To prevent overheating of the materials and thus the reduction of the component life, an internal flow system is required to cool the critical engine parts and to protect them. This paper shows a practical application and extension of the methodology developed during the five-year research program, main annulus gas path interaction (MAGPI). Extensive use was made of finite element analysis (FEA (solids)) and computational fluid dynamics (CFD (fluid)) modeling techniques to understand the thermomechanical behavior of a dedicated turbine stator well cavity rig, due to the interaction of cooling air supply with the main annulus. Previous work based on the same rig showed difficulties in matching predictions to thermocouple measurements near the rim seal gap. In this investigation, two different types of turbine stator well geometries were analyzed, where—in contrast to previous analyses—further use was made of the experimentally measured radial component displacements during hot running in the rig. The structural deflections were applied to the existing models to evaluate the impact inflow interactions and heat transfer. Additionally, to the already evaluated test cases without net ingestion, cases simulating engine deterioration with net ingestion were validated against the available test data, also taking into account cold and hot running seal clearances. 3D CFD simulations were conducted using the commercial solver fluent coupled to the in-house FEA tool SC03 to validate against available test data of the dedicated rig.

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Fig. 1

Typical turbine stator well

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Fig. 2

Compilation of previous results at the rim seal [47,10]

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Fig. 3

Test rig cross section

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Fig. 4

Overview of instrumentation inside the TSW

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Fig. 5

Indicated rim seal ingestion and egress rates [13]

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Fig. 6

2D finite element model for thermal analysis

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Fig. 7

2D finite element model for displacement calculations

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Fig. 8

3D baseline (left) and deflector (right) FEA models for coupled thermal analyses

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Fig. 9

Extent of the baseline 3D CFD sector model

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Fig. 10

Extent of the deflector plate 3D CFD sector model

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Fig. 11

Schematic representation of the coupling process

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Fig. 12

Temperature contours from the FEA model for the four test cases

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Fig. 13

Contours of nondimensional radial displacement from the FEA model for the four test cases

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Fig. 14

Contours of nondimensional adiabatic fluid temperature θad,fl from the steady-state CFD simulations

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Fig. 15

Comparison of air temperatures between CFD coupling results and experimental test data

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Fig. 16

Comparison of metal temperatures between coupling results and experimental test data for the baseline geometry

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Fig. 17

Comparison of metal temperatures between coupling results and experimental test data for the deflector geometry




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