Applicability of quasi-3d blade design methods to profile shape optimization of turbine blades
2013 (English)In: Proc. ASME Turbo Expo, 2013Conference paper (Refereed)
The performance of gas turbine airfoils is continually improved by creating advanced aerodynamic and thermal designs. Optimization methods are used to handle the increasing complexity of such a design. However, optimization is expensive when performed based on 3D CFD calculations. Therefore, an optimization strategy based on simpler, less expensive analysis methods is desirable. Oftentimes, a so-called quasi-3D (Q3D) approach is used, where 2D calculations are carried out on multiple, radially stacked meridional blade sections. This paper investigates the applicability of such an approach for optimization with regard to blade profile loss. Obviously, certain physical effects are neglected using this approach, leading to errors in the predicted blade performance. Still, optimization based on Q3D calculations might be possible if the error is consistent, i.e. not random. For this purpose, a design of experiment (DOE) was carried out to compare and correlate loss predictions from Q3D calculations and high-fidelity 3D CFD calculations for gas turbine blades. It is shown that the total pressure loss coefficients found with both the Q3D and 3D calculations correlate well (75-90%) to warrant the use of a Q3D method for profile shape optimization. Subsequently, an optimization is performed to demonstrate the applicability of the method.
Place, publisher, year, edition, pages
, Proceedings of the ASME Turbo Expo, 6 B
IdentifiersURN: urn:nbn:se:kth:diva-139415DOI: 10.1115/GT2013-95467ScopusID: 2-s2.0-84890172333ISBN: 9780791855232OAI: oai:DiVA.org:kth-139415DiVA: diva2:688310
ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013, 3 June 2013 through 7 June 2013, San Antonio, Tx
QC 201401162014-01-162014-01-132014-01-16Bibliographically approved