Accession Number : ADA326159

Title :   Comparisons of Rig and Engine Dynamic Events in the Compressor of an Axi-Centrifugal Turboshaft Engine.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Owen, A. K. ; Mattern, Duane L. ; Le, Dzu K.

PDF Url : ADA326159

Report Date : OCT 1996

Pagination or Media Count : 11

Abstract : Steady state and dynamic data were acquired in a T55-L-712 compressor rig. In addition, a T55-L-712 engine was instrumented and similar data were acquired. Rig and engine stall/surge data were analyzed using modal techniques. This paper compares rig and engine preliminary results for the ground idle (approximately 60% of design speed) point. The results of these analyses indicate both rig and engine dynamic events are preceded by indications of traveling wave energy in front of the compressor face. For both rig and engine, the traveling wave energy contains broad band energy with some prominent narrow peaks and, while the events are similar in many ways, some noticeable differences exist between the results of the analyses of rig data and engine data.

Descriptors :   *TURBOSHAFT ENGINES, *COMPRESSORS, *FOURIER ANALYSIS, STEADY STATE, DYNAMICS, GAS TURBINES, STALLING, BROADBAND, SURGES, ENERGY BANDS, TRAVELING WAVES, GAS TURBINE ROTORS.

Subject Categories : Theoretical Mathematics
      Test Facilities, Equipment and Methods
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE