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Suppression of Ground Engine Vortex
Engine ground vortex ingestion occurs during ground maneuvering of transport airplanes, which poses foreign object damage, engine surge hazards, and hinders the ability to land in austere fields. A continuous jet of air is discharged through a nozzle that swivels intermittently, just like a sprinkler (1), to prevent the formation of ground vortices. Inset 2 shows the collection of pathlines take by each particle released through out the simulation.
Simulation by ERDC and  The Boeing Co.

Suppression of Ground Engine Vortex
Engine ground vortex ingestion occurs during ground maneuvering of transport airplanes, which poses foreign object damage, engine surge hazards, and hinders the ability to land in austere fields. A continuous jet of air is discharged through a nozzle that swivels intermittently, just like a sprinkler (1), to prevent the formation of ground vortices. Inset 2 shows the collection of pathlines take by each particle released through out the simulation.
Simulation by ERDC and The Boeing Co.

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From Kevin Images