Tailored Structural Design and Aeromechanical Control of Axial Compressor Stall Part II - Evaluation of Approaches

L. G. Fréchette, O. G. McGee, M. B. Graf

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

A theoretical evaluation was conducted delineating how aeromechanical feedback control can be utilized to stabilize the inception of rotating stall in axial compressors. Ten aeromechanical control methodologies were quantitatively examined based on the analytical formulations presented in the first part of this paper (McGee et al, 2003a). The maximum operating range for each scheme is determined for optimized structural parameters, and the various schemes are compared. The present study shows that the most promising aeromechanical designs and controls for a class of low-speed axial compressors were the use of dynamic fluid injection. Aeromechanically incorporating variable duct geometries and dynamically re-staggered IGV and rotor blades were predicted to yield less controllability. The aeromechanical interaction of a flexible casing wall was predicted to be destabilizing, and thus should be avoided by designing sufficiently rigid structures to prevent casing ovalization or other structurally- induced variations in tip clearance. Control authority, a metric developed in the first part of this paper, provided a useful interpretation of the aeromechanical damping of the coupled system. The model predictions also show that higher spatial modes can become limiting with aeromechanical feedback, both in control of rotating stall as well as in considering the effects of lighter, less rigid structural aeroengine designs on compressor stability.

Original languageEnglish
Pages645-656
Number of pages12
DOIs
StatePublished - 2003
Event2003 ASME Turbo Expo - Atlanta, GA, United States
Duration: Jun 16 2003Jun 19 2003

Conference

Conference2003 ASME Turbo Expo
CountryUnited States
CityAtlanta, GA
Period06/16/0306/19/03

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    Fréchette, L. G., McGee, O. G., & Graf, M. B. (2003). Tailored Structural Design and Aeromechanical Control of Axial Compressor Stall Part II - Evaluation of Approaches. 645-656. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States. https://doi.org/10.1115/GT2003-38976