Engineering Mechanics

Proceedings Vol. 7 (2001)

INŽENÝRSKÁ MECHANIKA 2001

ENGINEERING MECHANICS 2001

Copyright © 2001 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague

 

Dvořák R.
pages 64 - +6p, full text

There are several characteristic features that distinguish separation in internal flows from that in external flows. The effect of side walls as well as of secondary flows due to wall curvature always make the phenomenon threedimensional. Aerodynamic choking at higher velocities affects flow separation by closing the separation bubble, or by supressing it entirely. The outflow conditions (namely the backpressure) can significantly change the conditions for flow separation (local versus global separation). Development of the separated flow and its boundary depends on the channel geometry, so that any analytical solution always has to solve simultaneously the viscous and in viscid parts of the flow field (strong interaction.). As an example, transonic separated flow in a highly curved closed channel has been analyzed on the basis of surface streamline visualization, as well as on optical and pressure measurements. The existence of two kinds of separatrices, the back flow, and the flow reattachment are discussed. The results may be useful in interpreting experiments in various channels and cascades.

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