joson2 wrote:The method of evaluation of this gain is therefore carried out, with the software software, by calculating the power taking into account the losses of the tip of the blades (no fairing), and without the losses of the tip of the blades (with fairing).
And above all we test on a concrete example!
joson2 wrote:For the part of your question on a second propeller, I think that a rotary counter could exploit the tangential speed induced by the first propeller, but the reduction in speed caused by the first propeller would make that of behind less profitable, therefore not really d 'interest.
I was not talking about a counter-rotating propeller, which poses a mechanical problem. However their advantage is to multiply the apparent speed of the 2 rotors between them, without loss of multiplier, but at the cost of a conductive bearing, and therefore subject to friction and wear.
I was talking about two propellers in the same direction but one behind the other, allowing for example to put only 2 blades, but by adjusting the second according to the distance to put the blade in the best place, while having a good mechanical balance.
joson2 wrote:For advertising, it's a bit true but Heliciel is a software that deserves to be talked about because many projects abort the fact that there are no tools for serious calculation of wind turbine propellers, so I think we can talk about it.
Everything is fine until you get run over by an elephant ;-)