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RESEARCH PAPERS

Rotating Stall Control in a High-Speed Stage With Inlet Distortion: Part I—Radial 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), 510-516 (Jul 01, 1999) (7 pages) doi:10.1115/1.2841345 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 annular array of 12 jet-injectors located upstream of the rotor tip was used for forced response testing and to extend the compressor stable operating range. Results for radial distortion are reported in this paper. First, the effects of radial distortion on the compressor performance and the dynamic behavior were investigated. Control laws were designed using empirical transfer function estimates determined from forced response results. The transfer functions indicated that the compressor dynamics are decoupled with radial inlet distortion, as they are for the case of undistorted inlet flow. Single-input-single-output (SISO) control strategies were therefore used for the radial distortion controller designs. Steady axisymmetric injection of 4 percent of the compressor mass flow resulted in a reduction in stalling mass flow of 9.7 percent relative to the case with inlet distortion and no injection. Use of a robust H∞ controller with unsteady nonaxisymmetric injection achieved a further reduction in stalling mass flow of 7.5 percent, resulting in a total reduction of 17.2 percent.

Copyright © 1999 by The American Society of Mechanical Engineers
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