A noise-reducing jet engine air inlet duct contoured to control air flow such that sound waves (noise) propagating upstream from the engine toward the entryway of the air inlet duct are refracted to the duct wall and/or engine inlet centerbody is disclosed. The inlet duct wall and/or engine inlet centerbody are contoured to establish a cross-sectional duct region having substantial airflow velocity gradients in a direction transverse to the direction of the airflow. Starting at the inlet duct entryway, the contoured duct region includes a parallel or div...
In an air inlet duct suitable for directing airflow to the inlet of a jet engine wherein said air inlet duct includes an entrance opening and a flow passage extending from said entrance opening for directing said airflow to said jet engine inlet, the improvement comprising means for establishing a velocity gradient in said airflow relative to the direction substantially transverse to the direction of aid airflow, said means for establishing said velocity gradient being located along a predetermined portion of said flow passage at a position downstream of...
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