NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 04.03-1541

PROJECT TITLE : Damping of Aerodynamic Instability with Active Tip Clearance Control

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

This proposal addresses the development of a novel system for improving the surge and stall characteristics in axial compressors in gas turbine engines and other systems. The innovation lies in the use of a magnetic bearing system to actively control tip clearance in the compressor stages. Temporal and circumferential pressure variations indicative of the growth and propagation of a rotating stall disturbance wave are detected with conventional pressure transducers. The signals from these transducers are processed and a "tip clearance schedule" is developed and presented to the magnetic bearing. The tip clearance is modified by the magnetic bearing to damp the aerodynamic instability. Previous studies show that active damping of aerodynamic instability may improve stalling coefficients by 25%.In Phase I, the feasibility will be demonstrated with design studies and computer simulations. The system will be built and tested in a full-scale engine rig in Phase II.
POTENTIAL COMMERCIAL APPLICATIONS
The development of an advanced system to improve the reduce the propensity for compressor instability would provide significant benefits to users of gas turbine engines in extending performance envelopes, preventative maintenance, life optimization, life cycle costs, and reliability.
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Dr. Victor Iannello
Synchrony Inc.
7777 Bent Mountain Road
Roanoke, VA 24018
NAME AND ADDRESS OF OFFEROR
Synchrony Inc.
7777 Bent Mountain Road
Roanoke, VA 24018