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STRUT
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Using the strut fitting program
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Make sure that all the .m files are in the same directory. Your
airfoil coordinate files do not have to be in the same directory.
Make sure that the first line in the airfoil coordinate file is not
the name of the airfoil, i.e. only numbers are allowed in the file.
Also make sure the coordinates are sorted TE-LE-TE and that the
leading edge point (usually 0,0) is not repeated. This is important,
since it is easy to forget to remove the extra point if you sorted the
coordinates with a spreadsheet such as MS Excel.
Start Matlab.
Change the directory to the directory with the .m files. Use the "cd"
command in Matlab to do this.
Run the GUI by typing "strut".
Now you can load an airfoil by clicking on the "load" button. Simply
choose the file. After loading the filename of the current airfoil,
the name of the filename will appear in the box below the "load"
button.
The size of the strut can be changed by changing the values for
"length" and "width". "Length" is the distance in the chordwise
direction. Units do not matter. You can also change the default
values by editing the "default.dat" text file.
Click on "calculate", wait a couple of seconds and the information for
the fitted airfoil should appear in the three remaining boxes. The
values are:
scale - How much you must enlarge the airfoil to fit over the box.
xLE% - Chord percentage where the leading edge of the strut is located.
xLE - Actual distance from the LE of the airfoil to the LE of the
strut.
Notes:
------
The program will not converge for low aspect ratio struts in very thin
airfoils. It should however work for all practical cases for the AE
416 homework assignment.
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Development Notes
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1) Matlab program for sizing airfoils to fit over a rectangular
strut written Sept 1999 by
B.A. Broughton
Graduate Student
Applied Aerodynamics Group
Dept. of Aerospace Engineering
University of Illinois at Urbana-Champaign
2) Minor fixes/updates/changes by Selig 090925
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