Validation of linearized navier-stokes based flutter prediction tool part2: Quantification of the prediction accuracy on a turbine test case
2012 (English)In: Proceedings of the ASME Turbo Expo 2012: Volume 7, Issue PARTS A AND B, 2012, ASME Press, 2012, no PARTS A AND B, 1581-1592 p.Conference paper (Refereed)
This is the second part of two papers describing the validation of a tool chain for flutter prediction. The first paper provides an overview of the numerical methods and their verification. The second paper presents the detailed validation of the tool chain on the basis of experimental data obtained from measurements of an annular cascade sector comprising 3D twisted turbine blades. Aeroelastic test data has been acquired in an isolated blade row consisting of seven free-standing low-pressure (LP) turbine blades. The middle blade has been oscillated in controlled manner in three orthogonal modes and at various frequencies while measuring the unsteady blade surface pressure on several blades. The data has been reduced to aerodynamic influence coefficients and finally recombined to travelling wave mode stability curves. By acquiring data at various spanwise positions, a basis for validating three-dimensional effects has been provided. The validation of the investigated flutter prediction tool has been performed in a detailed manner and on various levels, started from a critical reduced frequency over stability curves to local work coefficients. At the lowest level of condensation, the unsteady blade surface pressures have been compared. Correlation to test data is shown and discussed rigorously at these various levels giving a detailed assessment of the prediction accuracy of the investigated tool.
Place, publisher, year, edition, pages
ASME Press, 2012. no PARTS A AND B, 1581-1592 p.
, Proceedings of the ASME Turbo Expo, 7
Aerodynamic influence coefficients, Experimental datum, Linearized Navier-Stokes, Low-pressure turbine blades, Orthogonal modes, Prediction accuracy, Reduced frequency, Three dimensional effect
IdentifiersURN: urn:nbn:se:kth:diva-129810DOI: 10.1115/GT2012-69682ISI: 000335868800156ScopusID: 2-s2.0-84881159505ISBN: 978-079184473-1OAI: oai:DiVA.org:kth-129810DiVA: diva2:653909
ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012; Copenhagen; Denmark; 11 June 2012 through 15 June 2012
QC 201310072013-10-072013-10-042014-10-09Bibliographically approved