Mechanical Engineering; Energy Engineering and Power Technology; Aerospace Engineering
Abstract :
[en] The aerodynamics of a high-speed low-pressure turbine (LPT) cascade were investigated under steady and unsteady inlet flows. The tests were performed at outlet Mach (M) and Reynolds numbers (Re) of 0.90 and 70k, respectively. Unsteady wakes were simulated by means of a wake generator equipped with bars. A bar reduced frequency (f+) of ∼0.95 was used for the unsteady case. The inlet flow field was characterized in terms of the total pressure profile and incidence. The blade aerodynamics at midspan and the secondary flow region were investigated by means of pneumatic taps and hot-film sensors. The latter provided a novel view into the impact of the secondary flows on the heat transfer topology on the blade suction side (SS). The cascade performance was quantified in terms of the outlet flow angle and losses by means of a directional multi-hole probe. The results report the phase-averaged impact of unsteady wakes on the secondary flow structures in an open test case high-speed LPT geometry.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Do Carmo Lopes, Gustavo Filipe ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M) ; Turbomachinery and Propulsion Department, von Kàrmàn Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-St-Genèse, Belgium
Simonassi, Loris; Turbomachinery and Propulsion Department, von Kàrmàn Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-St-Genèse, Belgium
Lavagnoli, Sergio ; VKI - Von Karman Institute for Fluid Dynamics [BE]
Language :
English
Title :
Impact of Unsteady Wakes on the Secondary Flows of a High-Speed Low-Pressure Turbine Cascade
Publication date :
22 September 2023
Journal title :
International Journal of Turbomachinery, Propulsion and Power
H2020 - 820883 - SPLEEN - Secondary and Leakage Flow Effects in High-SPeed Low-PrEssurE TurbiNes
Funders :
EU - European Union
Funding text :
The authors gratefully acknowledge the funding of the SPLEEN project by the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation program under the grant agreement 820883.
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