United States. National Advisory Committee for Aeronautics, United States. National Aeronautics and Space Administration · Washington : G.P.O. · leaf 497
e speeds; as a result of this speed diflercnce, a vortex sheet must be formed between them.But such vortex sheets being unstable, as is known, they must break into a system of vortex rows. V. Karman ^ has shown that among all possible vortex rows, it is the system of quincunxvortex rows that… … Fig. 25. T^£ SrffUCTUf?£ OF T/iC IV/A/OBU/LO/NG OF QU/NCUNX VORTFX /^OWSBETW£:€NA/R LAYEf^S OF0/Fr£f^ENT VELOC/TY We are thus naturally brought to the conclusion that as a consequence of the speed differ-ence between air-layers, a formation of vortex rows in quincunx must take place between…
Aeronautics
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