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9th AIAA/CEAS Aeroacoustics Conference and Exhibit
A forward swept fan, designated the Quite High Speed Fan (QHSF), was tested in the NASA Glenn 9-by 15-foot Low Speed Wind Tunnel to investigate its noise reduction relative to a baseline fan of the same aerodynamic performance. The design objective of the QHSF was a 6 dB reduction in Effective Perceived Noise Level relative to the baseline fan at the takeoff condition. The design noise reduction was to be a result of lower levels of multiple pure tone noise due to the forward swept rotor, anddoi:10.2514/6.2003-3293 fatcat:7smhzu33s5eevilg24wjotiufa