Blade for centrifugal flow fan

Details Blade for centrifugal flow fan Blade for centrifugal flow fan

1991-11-07

1992-12-08

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

416223B, F01D 514

Patent

active

051692902

ABSTRACT:
A blade (14) for a centrifugal flow fan (11) having forward curved blades. The blade has a boundary layer trip (21) on its pressure surface (14). The trip promotes the transition of the boundary layer from laminar to turbulent flow and enables the layer to remain attached to the pressure surface for a greater distance. The increased amount of attached flow enables greater fan efficiency and reduces fan radiated noise. The boundary layer trip may be of a variety of configurations.

REFERENCES:
patent: 1864803 (1932-06-01), Clark
patent: 1903823 (1933-04-01), Lougheed
patent: 1943934 (1934-01-01), Telfer
patent: 3077173 (1963-02-01), Lang
patent: 4143536 (1979-03-01), Okamato et al.
patent: 4434957 (1984-03-01), Moritz
patent: 4692098 (1987-09-01), Razinsky et al.
patent: 4822249 (1989-04-01), Eckardt
patent: 4869644 (1989-09-01), Takigawa
patent: 4975023 (1990-12-01), Miura et al.

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