Accession Number:

ADA261366

Title:

Active Stabilization of Aeromechanical Systems

Descriptive Note:

Final technical rept. 1 Nov 1989-31 Oct 1992,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS

Report Date:

1993-01-05

Pagination or Media Count:

223.0

Abstract:

This report details the work on the active control of surge and stall in gas turbine engines. The use of small amplitude waves predicted by theory as stall precursors were tested with experimental data. The nonlinear behavior of such waves was shown to explain much of the data in the literature. This theory was used to design an active stabilization system for rotating stall which was tested on both a single-stage and a three-stage axial compressor, increasing the stable operating range of the single-stage compressor by 25. The dynamics of the three-stage compressor were shown to match closely with theory. The open- loop forced response characteristics of the compressors were measured and methodology developed in which this data was used to design the compressor control system. The models then developed were used to evaluate alternate control strategies. Engineering of the structural dynamics of the compression system was also shown to be successful in damping rotating stall and surge.... Active control, Compression system flow instabilities, Unsteady flow, Fluid-Structure interaction.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE