Turbulence Nature and the Inverse Problem. 1st ed. 2009

種類:

電子ブック

責任表示:

by L. N. Pyatnitsky

出版情報:

Dordrecht : Springer Netherlands : Imprint: Springer, 2009

著者名:

• Pyatnitsky, L. N.
• SpringerLink (Online service)

シリーズ名:

Fluid Mechanics and Its Applications ; 89

ISBN:

9789048122516 [9048122511]    

注記:

The turbulence problem -- Fluid motion -- Distribution of parameters in viscous flow -- Perturbations in viscous flow -- Perturbation in channels -- Spatio-temporal field of perturbations in channels -- Evolution of velocity oscillation field -- Experimental substantiation of turbulence wave model -- Transition from normal combustion to detonation -- An inverse problem of turbulence.
Hydrodynamic equations well describe averaged parameters of turbulent steady flows, at least in pipes where boundary conditions can be estimated. The equations might outline the parameters fluctuations as well, if entry conditions at current boundaries were known. This raises, in addition, the more comprehensive problem of the primary perturbation nature, noted by H.A. Lorentz, which still remains unsolved. Generally, any flow steadiness should be supported by pressure waves emitted by some external source, e.g. a piston or a receiver. The wave plane front in channels quickly takes convex configuration owing to Rayleigh's law of diffraction divergence. The Schlieren technique and pressure wave registration were employed to investigate the wave interaction with boundary layer, while reflecting from the channel wall. The reflection induces boundary-layer local separation and following pressure rapid increase within the perturbation zone. It propagates as an acoustic wave packet of spherical shape, bearing oscil

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