CUED Publications database

Unsteady flow evolution through a turning midturbine frame Part 1: Time-resolved flow

Lengani, D and Spataro, R and Paradiso, B and Göttlich, E (2015) Unsteady flow evolution through a turning midturbine frame Part 1: Time-resolved flow. Journal of Propulsion and Power, 31. pp. 1586-1596. ISSN 0748-4658

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© 2015 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. This paper identifies and analyzes the propagation of aerodynamic deterministic stresses through a two-spool counter-rotating transonic facility representative of modern and future turbine aeroengine sections. The test setup consists of a high-pressure stage, a diffusing turning midturbine frame with turning struts, and a counter-rotating low-pressure rotor. The flowfield downstream of the high-pressure stage is strongly influenced by the stator-rotor interaction. Such a mechanism interacts again with the downstream turning midturbine frame leading to a vane- rotor-vane interaction, which affects the behavior of the low-pressure stage. The results presented were obtained using a fast-response aerodynamic pressure probe for unsteady measurements as well as three-dimensional unsteady Reynolds-averaged Navier-Stokes calculations. The work is presented in two parts. This first part focuses on the explanation of the flow physics that governs the convection of unsteady three-dimensional flow through the midturbine duct. Viscous and inviscid mechanisms are discussed as main drivers for the convection of wakes, secondary vortices, andshocks.The flowfieldin the duct is characterizedbythree superimposedeffects: 1)ductdiffusionandradialpressure gradient together with turning strut potential field, 2) rotor unsteady work source, and 3) vane/blade interaction phenomena. The understanding of these mechanisms will eventually help to control the unsteadiness content in future architectures where reduced engine component length will enhance the interaction effects.

Item Type: Article
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:40
Last Modified: 21 Jun 2018 02:39