Skip to main content

A parametric analysis of reduced order models of potential flows in turbomachinery using proper orthogonal decomposition

Publication ,  Conference
Epureanu, BI; Dowell, EH; Hall, KC
Published in: Proceedings of the ASME Turbo Expo
January 1, 2001

An unsteady inviscid flow through a cascade of oscillating airfoils is investigated. An inviscid nonlinear subsonic and transonic model is used to compute the steady flow solution. Then a small amplitude motion of the airfoils about their steady flow configuration is considered. The unsteady flow is linearized about the nonlinear steady response based on the observation that in many practical cases the unsteadiness in the flow has a substantially smaller magnitude than the steady component. Several reduced order modal models are constructed in the frequency domain using the proper orthogonal decomposition technique. The dependency of the required number of aerodynamic modes in a reduced order model on the far-field upstream Mach number is investigated. It is shown that the transonic reduced order models require a larger number of modes than the subsonic models for a similar geometry, range of reduced frequencies and interblade phase angles. The increased number of modes may be due to the increased Mach number per se, or the presence of the strong spatial gradients in the region of the shock. These two possible causes are investigated. Also, the geometry of the cascade is shown to influence strongly the shape of the aerodynamic modes, but only weakly the required dimension of the reduced order models. Copyright © 2001 by ASME.

Duke Scholars

Published In

Proceedings of the ASME Turbo Expo

DOI

ISBN

9780791878507

Publication Date

January 1, 2001

Volume

1
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Epureanu, B. I., Dowell, E. H., & Hall, K. C. (2001). A parametric analysis of reduced order models of potential flows in turbomachinery using proper orthogonal decomposition. In Proceedings of the ASME Turbo Expo (Vol. 1). https://doi.org/10.1115/2001-GT-0434
Epureanu, B. I., E. H. Dowell, and K. C. Hall. “A parametric analysis of reduced order models of potential flows in turbomachinery using proper orthogonal decomposition.” In Proceedings of the ASME Turbo Expo, Vol. 1, 2001. https://doi.org/10.1115/2001-GT-0434.
Epureanu BI, Dowell EH, Hall KC. A parametric analysis of reduced order models of potential flows in turbomachinery using proper orthogonal decomposition. In: Proceedings of the ASME Turbo Expo. 2001.
Epureanu, B. I., et al. “A parametric analysis of reduced order models of potential flows in turbomachinery using proper orthogonal decomposition.” Proceedings of the ASME Turbo Expo, vol. 1, 2001. Scopus, doi:10.1115/2001-GT-0434.

Published In

Proceedings of the ASME Turbo Expo

DOI

ISBN

9780791878507

Publication Date

January 1, 2001

Volume

1