Aerodynamics by N.F. Krasnov

By N.F. Krasnov

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Sample text

For the adjacent layer at a distance of Ay = I' from the first one, the averaged velocity is V ~ + (dV;r;/dy) I'. According to Prandtl's hypothesis. a particle moving from the first layer into the second one rctains its \'elocity v:, and, consequently, at the instant when this particle appears in the second layer, the fluctuation \'elocity V~ = (dV)dy) I' is ob-served. The momentum transferred by the fluid mass pV; dS through the area element dS is pV~ (V;r; V~) dS. This momentum determines the additional force produced by the stress originating from the fluctuation velocities.

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E to statir longitudinal stability if upon n small deflection from the balanrc angle of attack neither a stabilizing nor a destahili:dng momen! il'! ' This angle of atta('k IX =- ahal in Fig. urvt' is tangent to the borilontal axis. It is obviow; that hert' the coefficient of the restoring moment Am~ -,. ma. 61X --: O. 1 Criteria of Static Stability. tabilizing or destabilizing momrml dependli i~ clllled the coeflleieut (degree) of static longitudinal stability_ This ~labil­ ity criterion reilltes to configurationl'!

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