Transverse fan with randomly varying J-shape tongue

摘要

The transverse fan (10) has an impeller with a maximum swept diameter (D) and the vortex wall has a span (S), comprising at least two segments (15). Each of the segments has a nose with a J-shaped cross section with a J tail (16) and a spanwise width (W). A nose-to-impeller clearance (c) and a setting angle (theta ). The segments are arranged to form the wall so that a J tail of a given segment extends in the opposite direction from the direction in which the J tail of an adjacent segment extends. The spanwise widths vary randomly among the segments within the bounds that no segment has a spanwise width that is less than 0.01 times nor more than 0.5 times the span. The nose-to-impeller clearances vary randomly among the segments within the bounds that no segment has a clearance that is less than 0.04 times nor more than 0.12 times the maximum swept diameter. The setting angles vary randomly among the total number of segments within the bounds that no segment has a setting angle that is greater than 30 degrees different than the setting angle of any other segment.