Adjoint-Based Aeroelastic Design Optimization Using a Harmonic Balance Method

Conference Paper (2020)
Author(s)

Nitish Anand (TU Delft - Flight Performance and Propulsion)

A. Rubino (TU Delft - Flight Performance and Propulsion)

P. Colonna (TU Delft - Flight Performance and Propulsion)

Matteo Pini (TU Delft - Flight Performance and Propulsion)

Research Group
Flight Performance and Propulsion
Copyright
© 2020 N. Anand, A. Rubino, Piero Colonna, M. Pini
DOI related publication
https://doi.org/10.1115/GT2020-16208
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 N. Anand, A. Rubino, Piero Colonna, M. Pini
Research Group
Flight Performance and Propulsion
ISBN (electronic)
9780791884089
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Turbomachinery blades characterized by highly-loaded, slender profiles and operating under unsteady flow may suffer from aeroelastic shortcomings, like forced response and flutter. One of the ways to mitigate these aeroelastic effects is to redesign the blade profiles, so as to increase aero-damping and decrease aero-forcing. Design optimization based on high-fidelity aeroelastic analysis methods is a formidable task due to the inherent computational cost. This work presents an adjoint-based aeroelastic shape-optimization framework based on reduced order methods for flow analysis and forced response computation. The flow analysis is carried out through a multi-frequency fullyturbulent harmonic balance method, while the forced response is computed by means of the energy method. The capability of the design framework is demonstrated by optimizing two candidate cascades, namely, i) a transonic compressor cascade and, ii) a supersonic impulse turbine rotor operating with toluene as working fluid, initially designed by means of the method of waves. The outcomes of the optimization show significant improvements in terms of forced-response in both cases as a consequence of aero-damping enhancement.

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