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RESEARCH PAPERS

Rotating Stall Control in a High-Speed Stage With Inlet Distortion: Part II—Circumferential Distortion

[+] Author and Article Information
Z. S. Spakovszky, H. J. Weigl, J. D. Paduano

Gas Turbine Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139

C. M. van Schalkwyk

Scientific Systems Co., Inc., Woburn, MA 01801

K. L. Suder, M. M. Bright

NASA Lewis Research Center, Cleveland, OH 44135

J. Turbomach 121(3), 517-524 (Jul 01, 1999) (8 pages) doi:10.1115/1.2841346 History: Received February 01, 1998; Online January 29, 2008

Abstract

This paper presents the first attempt to stabilize rotating stall in a single-stage transonic axial flow compressor with inlet distortion using active feedback control. The experiments were conducted at the NASA Lewis Research Center on a single-stage transonic core compressor inlet stage. An array of 12 jet injectors located upstream of the compressor was used for forced response testing and feedback stabilization. Results for a circumferential total pressure distortion of about one dynamic head and a 120 deg extent (DC(60) = 0.61) are reported in this paper. Part I (Spakovszky et al., 1999) reports results for radial distortion. Control laws were designed using empirical transfer function estimates determined from forced response results. Distortion introduces coupling between the harmonics of circumferential pressure perturbations, requiring multivariable identification and control design techniques. The compressor response displayed a strong first spatial harmonic, dominated by the well-known incompressible Moore–Greitzer mode. Steady axisymmetric injection of 4 percent of the compressor mass flow resulted in a 6.2 percent reduction of stalling mass flow. Constant gain feedback, using unsteady asymmetric injection, yielded a further range extension of 9 percent. A more sophisticated robust H∞ controller allowed a reduction in stalling mass flow of 10.2 percent relative to steady injection, yielding a total reduction in stalling mass flow of 16.4 percent.

Copyright © 1999 by The American Society of Mechanical Engineers
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