Influence of a vibration amplitude distribution on the aerodynamic stability of a low-pressure turbine sectored vane
2006 (English)In: Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines / [ed] Hall, KC; Kielb, RE; Thomas, JP, 2006, 17-29 p.Conference paper (Refereed)
A parametrical analysis summarizing the effect of the reduced frequency and sector mode shape is carried out for a low-pressure sectored vane cascade for different vibration amplitude distributions between the airfoils in sector as well as the numbers of the airfoils in sector. Critical reduced frequency maps are provided for torsion- and bending-dominated sector mode shapes. Despite the different absolute values of the average aerodynamic work between four-, five- and six-airfoil sectors a high risk for instability still exists in the neighborhood of realistic reduced frequencies of modern low-pressure turbine. Based on the cases studied it is observed that a sectored vane mode shape with the edge airfoils in the sector dominant provides the most unstable critical reduced frequency map.
Place, publisher, year, edition, pages
2006. 17-29 p.
flutter, sectored vane, sector mode shape, vibration amplitude distribution, critical reduced frequency
IdentifiersURN: urn:nbn:se:kth:diva-42252DOI: 10.1007/1-4020-4605-7_2ISI: 000237275800002ISBN: 1-4020-4267-1OAI: oai:DiVA.org:kth-42252DiVA: diva2:446352
10th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines (ISUAAAT) Location: Duke Univ, Durham, NC Date: SEP 08-11, 2003
QC 201110072011-10-072011-10-062011-10-07Bibliographically approved