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A multi-objective optimization framework for robust axial compressor airfoil design

  • Ivo Martin
  • Lennard Hartwig
  • Dieter Bestle
Research Paper
  • 48 Downloads

Abstract

Airfoil design for stationary gas turbines is a challenging task involving both aerodynamic and structural aspects. The paper describes a multidisciplinary optimization process for axial compressor airfoils which is able to find optimal designs w.r.t. multiple objectives and constraints starting from a reference design and very few specifications of the new compressor. The process allows to simultaneously execute arbitrarily many instances of design evaluation processes independently from each other, which speeds it up, not just due to parallelization, but also because fast-running low-fidelity evaluation may take the design lead at an early design stage, whereas high-fidelity evaluation processes simultaneously contribute with more reliable results on the actual performance. For consistency of aerodynamic and structural analysis, an innovative method for direct loaded-to-unloaded design transformation is incorporated. Additionally, the process accounts for design robustness by utilizing production tolerances as an optimization objective. Therefore, a procedure is developed which allows to find the production tolerance which may be allowed without violating any constraints. An application example demonstrates that the proposed optimization process incorporating automatic detection of failure-critical eigenmode bands is able to shift them such that structurally reliable, robust, and simultaneously aerodynamically efficient designs are obtained.

Keywords

Multidisciplinary design optimization Robustness Production tolerance assessment Loaded-to-unloaded transformation Structural analysis Aerodynamic analysis 

Notes

Acknowledgements

The authors gratefully acknowledge AG Turbo and General Electric Switzerland for their support and permission to publish this paper. The responsibility for the content lies solely with its authors.

Funding information

The research was conducted as part of the joint research program COOREFLEX-turbo in the frame of AG Turbo. The work was financially supported by the Bundesministerium für Wirtschaft und Technologie (BMWi) as per resolution of the German Federal Parliament under grant number 03ET7021J.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.BTU Cottbus-SenftenbergCottbusGermany

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