Previous Entry Share Next Entry
Jalousie with a wing profile as a mesh of AirHES
Earlier, I assumed that the aerodynamic resistance of a network with a cylindrical yarn can be significantly reduced if the thread is profiled, i.e. practically to replace the network with a peculiar micro-louver with an improved aerodynamic profile (for example, with a wing profile NASA4412 with a chord of 3 mm, a projection height [~ 2R] of 383 microns and a step [~ S] of 1000 microns). To study this assumption, I conducted CFD simulation for cloud conditions (droplet radius is 6 μm, flow velocity is 8 m/s). The results are shown in the XFlow screen shot:

If we compare these results with the MIT meshes (see my article "Optimization of mesh", the table on page 4), then it is seen that the efficiency of such jalousie increased insignificantly (P = 74.4%, X = 25.6% for the "one-dimensional" structure), and the drag coefficient Cx decreased to 0.736, i.e. by 20-30%, and not by an order of magnitude, as I assumed earlier. Considering the considerable complication and cost of such "jalousie" in comparison with conventional meshes, it should be recognized that such design of the "meshes" of AirHES has not met expectations and is unlikely to be used.


Log in

No account? Create an account