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research-article

Numerical Characterization of Flow and Heat Transfer in Pre-Swirl Systems

[+] Author and Article Information
Riccardo Da Soghe

Ergon Research srl, 50127, via Campani 50, Florence, Italy
riccardo.dasoghe@ergonresearch.it

Cosimo Bianchini

Ergon Research srl, 50127, via Campani 50, Florence, Italy
cosimo.bianchini@ergonresearch.it

Jacopo D'Errico

Ergon Research srl, 50127, via Campani 50, Florence, Italy
jacopo.derrico@ergonresearch.it

1Corresponding author.

ASME doi:10.1115/1.4038618 History: Received August 30, 2017; Revised October 10, 2017

Abstract

This paper deals with a numerical study aimed at the validation of a computational procedure for the aerothermal characterization of pre-swirl systems employed in axial gas turbines. The numerical campaign focused on an experimental facility which models the flow field inside a direct-flow pre-swirl system. Steady and unsteady simulation techniques were adopted in conjunction with both a standard two-equations RANS/URANS modelling and more advanced approaches such as the Scale-Adaptive-Simulation principle, the SBES and LES. Overall the steady-state CFD predictions are in reasonable good agreement with the experimental evidences even though they are not able to confidently mimic the experimental swirl and pressure behaviour in some regions. Scale resolved approaches improve the computations accuracy significantly especially in terms of static pressure distribution and heat transfer on the rotating disc. Although the use of direct turbulence modelling, would in principle increase the insight in the physical phenomenon, from a design perspective the trade-off between accuracy and computational costs is not always favourable.

Copyright (c) 2017 by ASME
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