Citation
Martinez-Cava Aguilar, Alejandro and Valero, Eusebio and Vicente, Javier de
(2018).
Sensitivity analysis of supersonic turbine trailing edges.
In: "6th. European Conference on Computational Mechanics . 7th. European Conference on computational Fluid Dynamics", 11-15 jun 2018, Gasglow. ISBN 978-84-947311-6-7. pp. 502-518.
Abstract
The use of compact architectures on aircraft turbine engines challenges the design and management of structural and thermal load requirements. Even operating in subsonic conditions, supersonic regimes may develop at the high pressure turbine pas- sages, experiencing complex compression and expansion wave systems that interact with adjacent stages of the turbine. When cooling flow is ejected through the blade trailing edge slots, non-symmetrical configurations can appear due to the interaction of the in- jected flow with the surrounding flow field, leading to undesired loads and efficiency loses. In this work, a combination of RANS simulations, global stability and sensitivity analy- sis is employed to identify and explain the physical mechanisms of this phenomenon. A global mode associated with the geometrical expansion of the trailing edge slot is iden- tified, and linked to the non-symmetrical configurations. To conclude, the regions where the flow would be more sensitive to flow modifications to excite or damp this phenomena are identified throughout an adjoint approximation.
