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research-article

SECONDARY FLOWS IN LPT CASCADES: NUMERICAL AND EXPERIMENTAL INVESTIGATION OF THE IMPACT OF THE INNER PART OF THE BOUNDARY LAYER

[+] Author and Article Information
Matteo Giovannini

Università degli Studi di Firenze, Via di Santa Marta 3, 50139 Firenze, Italy
matteo.giovannini@tgroup.unifi.it

Filippo Rubechini

Università degli Studi di Firenze, Via di Santa Marta 3, 50139 Firenze, Italy
filippo.rubechini@tgroup.unifi.it

Michele Marconcini

Università degli Studi di Firenze, Via di Santa Marta 3, 50139 Firenze, Italy
michele.marconcini@tgroup.unifi.it

Daniele Simoni

Università di Genova, Via Montallegro, 1, 16145, Genova, Italy
daniele.simoni@unige.it

Vianney Yepmo

Università di Genova, Via Montallegro, 1, 16145, Genova, Italy
vianney.yepmo.henang@edu.unige.it

Francesco Bertini

Avio Aero, Via I Maggio 99, 10040, Rivalta di Torino (TO), Italy
francesco.bertini@avioaero.com

1Corresponding author.

ASME doi:10.1115/1.4041378 History: Received August 08, 2018; Revised August 29, 2018

Abstract

Due to the low level of profile losses reached in low-pressure turbines (LPT) for turbofan applications, a renewed interest is devoted to other sources of loss, e.g. secondary losses. At the same time, the adoption of high-lift profiles has reinforced the importance of these losses. A great attention, therefore, is dedicated to reliable prediction methods and to the understanding of the mechanisms that drive the secondary flows. In this context, a numerical and experimental campaign on a state-of-the-art LPT cascade was carried out focusing on the impact of different inlet boundary layer (BL) profiles. First of all, detailed RANS analyses were carried out in order to establish dependable guidelines for the computational setup. Such analyses also underlined the importance of the shape of the inlet BL very close to the endwall, suggesting tight requirements for the characterization of the experimental environment. The impact of the inlet BL on the secondary flow was experimentally investigated by varying the inlet profile very close to the endwall as well as on the external part of the BL. The effects on the cascade performance were evaluated by measuring the span-wise distributions of flow angle and total pressure losses. For all the inlet conditions, comparisons between CFD and experimental results are discussed. Besides providing guidelines for a proper numerical and experimental setup, the present paper underlines the importance of a detailed characterization of the inlet BL for an accurate assessment of the secondary flows.

Copyright (c) 2018 by ASME
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