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Forced response testing of an axi-centrifugal turboshaft engineDynamic data from tests of a T55-L-712 engine are presented. Engine stall/surge data were analyzed using digital signal processing techniques. In addition, forced response testing (system identification studies) was done at various engine speeds. Forced response testing was done using eight jet ejectors approximately equally circumferentially spaced about the compressor front face. This paper presents some preliminary results for the ground idle (approximately 60% of design speed) point. Brief descriptions of the jet injection system, the test matrix, and analysis techniques used are presented. Results of these analyses indicate a substantial transfer of energy across the compressor first stage at some frequencies and that the ejectors are effective in modifying the local flow conditions in front of the first compressor stage.
Document ID
19960048689
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Owen, A. Karl (NASA Lewis Research Center Cleveland,OH United States)
Le, Dzu K. (NASA Lewis Research Center Cleveland,OH United States)
Braun, Donald C. (NASA Lewis Research Center Cleveland,OH United States)
Mattern, Duane L. (NYMA, Inc. Brook Park, OH United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1996
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NAS 1.15:107282
E-10357
NASA-TM-107282
AIAA Paper 96-2573
ARL-TR-1151
Meeting Information
Meeting: Joint Propulsion Conference
Location: Lake Buena Vista, FL
Country: United States
Start Date: July 1, 1996
End Date: July 3, 1996
Sponsors: Society of Automotive Engineers, Inc., American Inst. of Aeronautics and Astronautics, American Society of Mechanical Engineers, American Society for Electrical Engineers
Accession Number
96N33909
Funding Number(s)
PROJECT: RTOP 505-62-10
PROJECT: DA Proj. 1L1-62211-A-47-A
CONTRACT_GRANT: NAS3-27186
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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