INVESTIGATION OF TURBOJET 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 birds by a twin-spool axial-flow turbojet engine. Various quantities of birds were propelled into the engine inlet at velocities on the order of 125 knots by a compressed air gun. The engine was subjected to ingestion of a total of 59 starlings in densities ranging from 3 to 20 birds per test and one sea gull. Transient and steady-state engine performance was monitored and recorded during and following ingestion sequences. An abrupt fluctuation in engine performance was sustained in all tests conducted with subsequent engine recovery and stabilization being attained in approximately two seconds, with the exception of one test which required manual manipulation of engine controls prior to engine recovery. This test involved the ingestion of 20 birds and resulted in a continuous compressor stall condition until corrective action was taken. Residual contamination of the engine resulted in some decreases in overall engine efficiency. Substantial damage was incurred by the inlet guide vanes and the first stage compressor rotor blades during the course of the program. Author
- Jet and Gas Turbine Engines