Blade designer

One of the initial steps in the construction of a wind generator is calculating the profile of the blade. There are various programs to do this. All you have to do is enter the desired profile of the blade and some other parameters and the program will return the parameters of the profile itself. The important data are mostly these: the length of the blade (radius of the rotor), the number of blades, the ratio between wind speed and the speed of the tip of the rotor, the rake of the blade. The Blade Designer calculates all parameters and the result is the wing profile in the STL format. STL format (STereoLythography) is known by virtually all programs to run the CNC machines. A lot of effort has been put into the form of the blade in the area of its head (axis). I know of no program that can perform this detail, too, and therefore, when we enter the parameters we get a finalized blade ready to be made on a CNC machine. Besides the STL file the program also makes an XLS file. The XLS table gives the parameters for each and every milimetre of the radius, like the width of the profile, the rake of the profile, the area of the profile and, last but not least, the information about what centrifugal force is on a particular part of the blade. The centrifugal force is more prominent than al other forces in the rotor and it is most dangerous for the integrity of the rotor. Besides the centrifugal force there are also the air friction force and the force of the giroscopic effect when the rotor turns against the wind. But these forces are smaller compared to the centrifugal force and are not calculated at this point. A blade that is not good can also vibrate, which is also potentially dangerous for the integrity of the rotor.

The software is not completed yet.

Page under construction.