Observed twisted wind profiles are with larger wind twist angles and are confined to the lower 500 m of the atmosphere, thus may impose significant effects on both structures and near-ground wind conditions.
Due to the embedded wind twist angles, wind incidence angles have different effects on flow modifications in twisted wind profiles than in conventional wind profiles.
And the total wind twist angles can reach 5° 40° over the first 1000 m.
Twisted yarns of highly aligned PAN nanofibers with twist angles between 1.1 and 16.8° were prepared.
The optimal chords and twist angles were provided with series of splines and points and three-dimensional blade models.
Meanwhile, the effects of swept-tip and twist angles on the aerodynamic characteristic of rotor have been performed.
The calculated nonlinear response develops a very strong maximum (βμ ∼ 1500 ×10−30 esu) at twist angles near 80°.
A refined range of blade twist angles between 300° and 400° was then identified, and 4 additional geometries were evaluated.
These superstructures are expected to have electronic and optical properties that depend on even small changes in the twist angles.
Dai, S., Xiang, Y. & Srolovitz, D. J. Atomistic, generalized Peierls Nabarro and analytical models for (111) twist boundaries in Al, Cu and Ni for all twist angles.
For small twist angles, the moiré pattern that is produced by the lattice misorientation between the two-dimensional layers creates long-range modulation of the stacking order.
