SebastianL wrote:FALCON_12 wrote:remundo wrote:
It's true, the incident kinetic power of the wind is 1/2 ro S v^3
where S is the section where the wind flows at speed v.
ro is the density.
That said, channeling the wind into a fairing decreasing its section does not increase the power.
If channeling the wind increases V and P is proportional to V^3 why does P not increase?
No, to accelerate the wind which has a mass you need an additional pressure, pressure which will be higher than that which surrounds the valve tower, the wind will just bypass it cf limit of beltz
Hmmm .... let's imagine that this tower has a square section and that the wind meets it perpendicular to one of its side faces. Let's also imagine that it is 5 times higher than it is wide. Behind the impacted face, on the symmetrical face, a depression is created due to the separation of the air layer (the square section prohibits laminar flow). You can follow this column of depression to the top of the tower and arrive at the exit of the tower, at the very top. There the air leaves and can join the column of depression while returning downwards. It is therefore perhaps established a flow which enters by the valves, goes up inside the tower and joins the column of depression to return to the equality of pressures and speeds in the distance.
In this diagram the tower has created a detachment, therefore a depression which is compensated by the air which it absorbs and rejects at its top. There would therefore be a flow whose speed increases with the ratio Sout/Sin (Sin: elevation surface of the tower, Sout: lateral surface of a profile of the tower). In this hypothesis it is perhaps counter-productive to increase the facets of its section polygon because the more it is circular, the less the effect is, the more the air bypasses it without much separation.
Well that said, a good simulation is not refused!