Experimental Investigation on Small Turboprop Behaviour under Compressor Rotating Stall for Different Inlet Flow Conditions,
ALFA ROMEO S P A NAPLES (ITALY)*
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This paper deals with an experimental investigations on compressor rotating stall and acoustic noise in a small turboprop. The intent of the study, undertaken in Alfa Romeo Avio using the engine test bed during the initial phase of the AR 318 turboprop development program, was to clarify the noisy and unstable behaviour of some engines at part-speeds. This report presents the overall performances of the centrifugal compressor, the time-dependent wall static pressure measurements to visualize impeller rotating stall regions on the compressor map, and the acoustic noise signals detected at the engine air-intake inlet. Finally, the engine performances in stalled compressor conditions are analyzed and main results discussed.
- Fluid Mechanics
- Jet and Gas Turbine Engines