WT was developed at NASA Lewis Research Center to calculate fan rotor power
requirements and output thrust for a closed loop wind tunnel. The program
uses blade element theory to calculate aerodynamic forces along the blade
using airfoil lift and drag characteristics at an appropriate blade aspect
ratio. A tip loss model is also used which reduces the lift coefficient to
zero for the outer three percent of the blade radius. The application of
momentum theory is not used to determine the axial velocity at the rotor
plane. Unlike a propeller, the wind tunnel rotor is prevented from
producing an increase in velocity in the slipstream. Instead, velocities
at the rotor plane are used as input. Other input for WT includes
rotational speed, rotor geometry, and airfoil characteristics. Inputs for
rotor blade geometry include blade radius, hub radius, number of blades,
and pitch angle. Airfoil aerodynamic inputs include angle at zero lift
coefficient, positive stall angle, drag coefficient at zero lift
coefficient, and drag coefficient at stall.

WT, LEW-15534, is written in APL2 using IBM's APL2 interpreter for IBM PC
series and compatible computers running MS-DOS. WT requires a CGA or
better color monitor for display. It also requires 640K of RAM and MS-DOS
v3.1 or later for execution. Both an MS-DOS executable and the source code
are provided on the distribution medium. The standard distribution medium
for WT is a 5.25 inch 360K MS-DOS format diskette in PKZIP format. The
utility to unarchive the files, PKUNZIP, is also included. Program $100;
documentation $12.

COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
706-542-3265,  fax: 706-542-4807

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