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Research Papers

Turbine Blade Cooling System Optimization

[+] Author and Article Information
Julian Girardeau

Arts et Metiers ParisTech,
I2M, UMR 5295,
F-33400 Talence, France
TURBOMECA SAFRAN Group,
F-64511 Bordes, France
e-mail: julian.girardeau@snecma.fr

Jérôme Pailhes

Arts et Metiers ParisTech,
I2M, UMR 5295,
F-33400 Talence, France
e-mail: jerome.pailhes@ensam.eu

Patrick Sebastian

Univ. Bordeaux,
I2M, UMR 5295,
F-33400 Talence, France
e-mail: patrick.sebastian@i2m.u-bordeaux.fr

Frédéric Pardo

TURBOMECA SAFRAN Group,
F-64511Bordes, France
e-mail: frederic.pardo@turbomeca.fr

Jean-Pierre Nadeau

Arts et Metiers ParisTech,
I2M, UMR 5295,
F-33400 Talence, France
e-mail: jean-pierre.nadeau@ensam.eu

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 29, 2012; final manuscript received November 29, 2012; published online September 13, 2013. Editor: David Wisler.

J. Turbomach 135(6), 061020 (Sep 13, 2013) (13 pages) Paper No: TURBO-12-1181; doi: 10.1115/1.4023466 History: Received August 29, 2012; Revised November 29, 2012

Designing high performance cooling systems suitable for preserving the service lifetime of nozzle guide vanes of turboshaft engines leads to significant aerodynamic losses. These losses jeopardize the performance of the whole engine. In the same time, a low efficiency cooling system may affect the costs of maintenance repair and overhaul of the engine as component life decreases. Consequently, designing cooling systems of gas turbine vanes is related to a multiobjective design problem. In this paper, it is addressed by investigating the functioning of a blade and optimizing its design by means of an evolutionary algorithm. Systematic 3D CFD simulations are performed to solve the aero-thermal problem. Then, the initial multiobjective problem is solved by aggregating the multiple design objectives into one single relevant and balanced mono-objective function; two different types of mono-objective functions are proposed and compared. This paper also proposes to enhance available knowledge in the literature of cooling systems of gas turbine vanes by simulating the internal cooling system of the vane. From simulations thermal efficiency and aerodynamic losses are compared and their respective influences on the global performances of the whole engine are investigated. Finally, several optimal designs are proposed.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

The OIA flow chart

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Fig. 2

Blade and representative slice

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Fig. 3

Design variables related to the trailing edge of the blades

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Fig. 4

Observation model flow chart

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Fig. 5

Blade and inner fluid mesh

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Fig. 6

CFD model boundary conditions

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Fig. 7

Aerothermal problem solving diagram

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Fig. 8

NGV life evolution with maximum metal temperature

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Fig. 9

Impact of dihedral angle on Mach numbers

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Fig. 10

Objective function of the first model

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Fig. 11

Direct maintenance cost

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Fig. 12

Objective function of the second model

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Fig. 13

Harrington's desirability functions

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Fig. 14

Service lifetime desirability function

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Fig. 15

Design exploration results

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Fig. 16

Reference (on top) and optimal solution (on bottom)

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