INVESTIGATION OF TURBOPROP ENGINE CHARACTERISTICS DURING BIRD INGESTION.
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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Tests were conducted to determine specific reactions to the ingestion of small birds by a free turbine turboprop engine. Transient and steady-state engine performance was monitored and recorded during and following ingestion sequences. In general, a deterioration in engine performance was indicated upon ingestion of birds or portions thereof. Subsequent engine recovery and stabilization to operating levels below preingestion values were attained in periods from 2 to 4 seconds. Operating levels were reduced as much as 50 percent and were in general a function of the quantity of starlings which entered the inlet duct. Following multiple bird ingestion tests, the degree of inlet blockage prevented preingestion power levels from being attained. No evidence of engine flameout was recorded during any of the 16 test runs conducted, nor was any autofeathering signal indicated. There was no visible damage sustained by the engine which could be attributed to bird impact. Author
- Jet and Gas Turbine Engines