Download All the World's Battleships - 1906 to the Present by I. Sturton PDF

By I. Sturton

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Heine et al. performed similar experiments on CVS control behind a cylinder in [126, 337]. The difference is that one or two slots were made along the cylinder at various angles in the region of the separation line. A loudspeaker was mounted outside against the slot. It generated a pressure field that forced liquid to be blown from and suck into the slot with the frequency of the loudspeaker. Tests were also performed with two slots on two sides of the cylinder under the same angle (%70 ) to its cross-section.

Numerical researches by Schatz et al. [3, pp. 385À390] defined the efficiency of such adjustable plates up to an angle of 52 . Bionics research by Kesel [471] of dragonfly wings has revealed the specific structure of their rear edge. Bechert investigated the influence of various forms of rear edge on the aerodynamic characteristics of a wing similar to aerodynamic profile HQ17, including modeling the back edge of a dragonfly wing [471]. All the tested designs increased the coefficient of lift force of the wing at angles of attack ranging from 5o to 10o, which is % % within the limits of angles used by modern planes in cruiser flight.

Triangular inserts (vortex generators) were installed flush behind the cabin in the separation zone. The vortex generator was designed by Skramstad [144]. The vortexgenerator design is such that when a separation zone occurs the triangular vortices generated are sucked out due to underpressure; rows of triangular wings were set in so that longitudinal vortical systems form behind the wings. Earlier, Bechert and Bannasch [110, 471] used rectangular plates with a similar purpose. Another method was developed Blackwelder and Gad-el-Hak [121].

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