| 摘要 |
803,419. Boundary layer control on aerofoils. RINGLEB, F. O. Nov. 4,1954 [March 30, 1954], No. 31961/54. Class 4. A surface past which fluid flows comprises a cusp designed so that the fluid forms a vortex in equilibrium in a cavity defined at least in part by the cusp. Fig. 2 shows an aerofoil 21 having a flap 22 pivoted to the aerofoil at 24. A cusp is formed at 23, defining the cavity with the flap. The Specification gives formulae for determining the characteristics and location of the cusp. Suction may be applied at 23a and at 25 by a suction source 26. A plate 15 normally nested as shown may be moved to position 15a to blank off the cavity. Fig. 4 shows an embodiment in which the aerofoil 41 has a cusp formed in a flap 43. Suction is applied at the trailing edge of the flap as shown by arrow 50, and a slot 42 is formed between the aerofoil and flap.
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