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Research Papers: Gas Turbines: Turbomachinery

Thermofluid Dynamic Analysis of a Gas Turbine Transition-Piece

[+] Author and Article Information
Riccardo Da Soghe

Ergon Research s.r.l.,
via Panciatichi 92,
Florence 50139, Italy
e-mail: riccardo.dasoghe@ergonresearch.it

Cosimo Bianchini

Ergon Research s.r.l.,
via Panciatichi 92,
Florence 50139, Italy

Antonio Andreini, Lorenzo Mazzei

DIEF—Department of Industrial Engineering Florence,
University of Florence,
via di Santa Marta 3,
Firenze (FI) 50139, Italy

Giovanni Riccio, Alessandro Marini, Alessandro Ciani

GE Oil and Gas,
University of Florence,
via Matteucci 2,
Florence 50127, Italy

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 6, 2014; final manuscript received October 7, 2014; published online December 9, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(6), 062602 (Jun 01, 2015) (9 pages) Paper No: GTP-14-1466; doi: 10.1115/1.4028869 History: Received August 06, 2014; Revised October 07, 2014; Online December 09, 2014

The transition-piece of a gas turbine engine is subjected to high thermal loads as it collects high temperature combustion products from the gas generator to a turbine. This generally produces high thermal stress levels in the casing of the transition piece, strongly limiting its life expectations and making it one of the most critical components of the entire engine. The reliable prediction of such thermal loads is hence a crucial aspect to increase the transition-piece life span and to assure safe operations. The present study aims to investigate the aerothermal behavior of a gas turbine engine transition-piece and in particular to evaluate working temperatures of the casing in relation to the flow and heat transfer situation inside and outside the transition-piece. Typical operating conditions are considered to determine the amount of heat transfer from the gas to the casing by means of computational fluid dynamics (CFD). Both conjugate approach and wall fixed temperature have been considered to compute the heat transfer coefficient (HTC), and more in general, the transition-piece thermal loads. Finally a discussion on the most convenient HTC expression is provided.

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References

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Figures

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Fig. 1

A reverse-flow combustion chamber arrangement [16]

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Fig. 2

Numerical domain and boundary conditions

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Fig. 4

Experimental campaign: thermocouples position

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Fig. 5

Comparisons between the experiment and the CFD conjugate solution: section S0

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Fig. 6

Comparisons between the experiment and the CFD conjugate solution: section S1

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Fig. 7

Comparisons between the experiment and the CFD conjugate solution: section S2

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Fig. 8

Comparisons between the experiment and the CFD conjugate solution: section S3

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Fig. 9

Velocity contour plot on the geometrical symmetry plane

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Fig. 10

Velocity contour plot on axial planes

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Fig. 11

Temperature contour plot on the geometrical symmetry plane

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Fig. 12

Overall effectiveness on transition piece surfaces

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Fig. 13

Heat transfer process

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Fig. 14

Upper transition piece midline

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Fig. 15

Temperature distribution over the upper transition piece midline

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Fig. 16

HTC distribution over the upper transition piece midline

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Fig. 17

Two-way interaction between solid and fluid

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Fig. 18

Hot side HTC* profile in case of different TR

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Fig. 19

Solid temperature profile

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Fig. 20

Cold side HTC* profile

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Fig. 21

Hot side HTC* profile

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Fig. 22

Heat flux through the TP wall

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