In this study, we tried to improve the performance by giving a pre-swirling flow radial inflow that occurred in semi-opened axial fan. addition, fields of rotor outlet were clarified experimentally, and effect was considered. The experiment carried out using test wind tunnel with square cross section 880 mm. Three types casings prepared, which blade tip protruded 0%, 20%, 40% meridional chord l...

During the past eight years, researchers at Brigham Young University have been engaged in a pragmatic effort to actively reduce the noise radiation from small axial cooling fan noise. The first of a series of studies on the subject demonstrated that a feedforward, multichannel controller with near-field error sensors was successful in globally reducing four harmonics of the blade passage freque...