Fan design with low acoustic tonal components
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 13, 2001
Grant Date -
N/A
app pub date -
May 4, 2000
filing date -
Nov 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fan 10 includes a hub 12 rotatable about an axis 22; an annular band 16 concentric with the hub and spaced radially outward from the hub; fan blades 14 distributed circumferentially around the hub and extending radially and axially from the hub to the annular band. Each blade has specific parameters defined by: r, the non-dimensional radius from the rotational axis (r=R/R.sub.tip with R being the radius from the rotational axis and R.sub.tip being the radius from the rotational axis at the blade tip), .xi., the stagger angle of the blade at the radial distance r, .theta., the camber angle of the blade at the radial distance r, .sigma., the solidity C/S, with C being chord length and S being the circumferential blade spacing at the radial distance r, c, the non-dimensional chord length (C/R.sub.tip) of the blade at the radial distance r, t, the non-dimensional thickness (T/C where T is the actual thickness at R) of the blade at radius r, .LAMBDA., the skew angle of the blade at the radial distance r calculated at 30% chord where the skew at the hub radius is defined as zero skew, and dH/dR, the slope of the dihedral measured at r.
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