Effect on the aerodynamic forcing in an axial turbine stage on varying stator blade shape
2012 (English)In: Proceedings of the 28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012: Vol.4, 2012, 2816-2827 p.Conference paper (Refereed)
The aim of this paper is to describe the procedure and the outcome of a study performed in order understand the dependence of the forced response of the rotor blades in a turbine stage on a selection of different shape modifications, namely lean, sweep and a number of their combination, of the stator blades by means of computational fluid dynamics (CFD. The adopted criterion to compare the different analyzed cases is the generalized force obtained by the projection of the unsteady aerodynamic forces onto the rotor blade natural mode shapes derived by means of a finite element analysis. A mode excitability study was first conducted by putting emphasis on the lower frequencies modes widely considered as the most critical ones in real applications, in an attempt to identify and characterize their behavior with respect to the stator blade shapes. A forced response assessment exercise was then performed for the specific case under exam in order to discover the optimal configuration, intended as with the smallest maximum value of the generalized forces for each possible condition of resonance of the machine. Steady simulations were used to assess the permanence of the working conditions, as expressed by the mass flow, the pressure ratio, the loading and the flow coefficients, within reasonable limits from the baseline case for the entire set of studied variations.
Place, publisher, year, edition, pages
2012. 2816-2827 p.
Aerodynamic forcing, CFD, Turbine
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-132105ScopusID: 2-s2.0-84881496169ISBN: 978-162276754-0OAI: oai:DiVA.org:kth-132105DiVA: diva2:658350
28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012; Brisbane; Australia; 23 September 2012 through 28 September 2012
QC 201310212013-10-212013-10-212013-10-21Bibliographically approved