URANS Analysis of Wake-Induced Effects in High-Lift, Low Reynolds Number Cascade Flows

TitleURANS Analysis of Wake-Induced Effects in High-Lift, Low Reynolds Number Cascade Flows
Publication TypeConference Proceedings
Year of Publication2012
AuthorsPacciani R, Marconcini M, Arnone A, Bertini F
Conference NameASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Volume8: Turbomachinery, Parts A, B, and C
Conference LocationCopenhagen, Denmark, 11-15 June.
ISBN Number978-0-7918-4474-8
Accession NumberWOS:000335720900134
Other NumbersScopus 2-s2.0-84881142323
KeywordsHigh Lift, LKE, Wake-Induced Transition

A URANS solver has been applied to the analysis of unsteady effects induced by incoming wakes in high-lift, low-Reynolds-number cascade flows. The study has been carried out using a novel, transition-sensitive, turbulence model. It is based on the coupling of two additional transport equations, one for the so-called laminar kinetic energy (LKE) and one for a turbulence indicator function, with the Wilcox k-omega model. Two high-lift cascades (T106C and T2), recently tested at the Von Karman Institute in the framework of the two european projects UTAT (Unsteady Transition in Axial Turbomachines) and TATMo (Turbulence and Transition Modelling for Special Turbomachinery Applications), were considered for the present study. The analyzed Reynolds number values span the whole range typically encountered in aeroengines low-pressure turbines operations, and both steady and periodically unsteady inflow conditions were considered. A detailed comparison between measurements and computations, in terms of blade surface isentropic Mach number distributions and cascade lapse rates will be presented and discussed. Results with the proposed model show its ability to predict the major effects of passing wakes on the boundary layer development and loss characteristics of high-lift cascades operating in LP-turbine conditions.


ASME paper GT2012-69479.

Refereed DesignationRefereed