Accession Number : ADA332851

Title :   Active Control of Aeroelasticity and Internal Flows in Turbomachinery

Descriptive Note : Final rept. 1 Nov 92-30 Apr 96

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB

Personal Author(s) : Epstein, Alan H. ; Paduano, James D. ; Greitzer, Edward M.

PDF Url : ADA332851

Report Date : AUG 1996

Pagination or Media Count : 187

Abstract : The research conducted was focused in two areas. The first is active control of rotating stall when inlet distortion is present. This research was carried out on the low speed 3-stage active control research compressor at MIT=GTL. The second area of research was active control of surge in centrifugal and axi-centrifugal engines. Stabilization of such engines beyond their normal stability boundary requires control of 1D oscillations which lead to surge rather than the higher dimensional oscillations which lead to rotating stall. Typically surge control alone allows uncontrolled rotating stall modes to go unstable, which would be debilitating (and probably eventually lead to surge) in an axial compression system. Rotating stall in centrifugal compressors, however, is quite different. If one can prevent surge in a centrifugal machine, rotating stall causing gradual, recoverable performance degradation of the compressor. Thus active control of surge alone can increase engine operating range in engines containing centrifugal compressors.

Descriptors :   *AEROELASTICITY, *GAS TURBINES, *CENTRIFUGAL COMPRESSORS, AERODYNAMIC STABILITY, FLOW FIELDS, STALLING, JET ENGINE INLETS, HEAD(FLUID MECHANICS), GAS GENERATOR ENGINES, AXIAL FLOW COMPRESSORS, ENGINE SURGE.

Subject Categories : Aerodynamics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE