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Influence of tip shroud cavities on low-pressure turbine main flowat design and off-design conditions

Perini, Maxime and Binder, Nicolas and Bousquet, Yannick and Schwartz, Eric Influence of tip shroud cavities on low-pressure turbine main flowat design and off-design conditions. (2021) In: 14th European Conference on Turbomachinery Fluid dynamics & Thermodynamics - ETC14, 12 April 2021 - 16 April 2021 (Gdansk, Poland).

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Abstract

A lot of studies on turbomachinery main flow optimisation have been performed in order to reach actual efficiency level of modern gas turbines. To go further in the study of aerodynamic losses sources, a better understanding on technological effects is required. Tip shroud cavities in low pressure turbine is an example. Indeed, the by-pass flow causes additional pressure losses. In addition, interactions between main flow and cavity flows, as well as the re-entering flow, cause mixing losses and modifications of flow angle. This paper investigates the contribution of tip shroud cavities in a low pressure turbine stage on flow structures using (Unsteady) Reynolds Averaged Navier-Stokes simulations. The ability of a steady simulation to predict the overall performance and flow physics of this kind of flow is well documented in the literature but time-resolved simulations are needed to deepen the analysis. This is an objective of this paper. Following the presentation of the configuration under investigation, an analysis of flow structures is made in the upstream region of the rotor, close to the shroud. After that, simulations at off-design conditions are studied in order to evaluate this impact on the previous mechanisms.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
Funders:
Safran Aircraft Engine
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Deposited On:19 Oct 2021 13:06

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