Acoustic Results from Tests of a 36-Inch (0.914 M) Diameter Statorless LIFT FAN with Serrated and Unserrated Rotor Blades

摘要

Tests of the LF336/E statorless lift fan with serrated and underrated rotor landing:edges Indicated broadband noise reductions of 2 to 5 dB in the forward quadrant. Broadband noise levels near the blade passing frequency end above were reduced only from 80 to 100 degrees relative to the inlet.