National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Numerical and Experimental Investigation of the Flow Field in Five Blade Linear Cascade in Subsonic Flow
Šnábl, Pavel ; Chindada, Sony ; Bublík, O. ; Procházka, Pavel P. ; Prasad, Chandra Shekhar
In large steam turbines, last stage blades are very long and must be designed very thin and with no shroud to minimize the centrifugal force which leads to low eigenfrequencies and low structural damping. In this case, aero-elastic damping plays important role on last stage bladed disc’s dynamics. Three major aero-elastic issues found in turbomachinery are forced response, non-synchronous vibrations, and flutter. Flutter is an unstable, self-excited vibration resulting from coupling between the structural vibrations and unsteady aerodynamic forces. It is clear that this unstable behaviour must be avoided and predictions of flutter behaviour need to be performed during design stage of the turbine.\n
Numerical and Experimental Investigation of Compressible Viscous Fluid Flow in Minichannels
Prausová, H. ; Bublík, O. ; Vimmr, J. ; Hála, Jindřich ; Luxa, Martin
The study is focused on the value of critical Reynolds number Rec and also on suitable approaches to the measuring and modelling of the compressible viscous fluid flow in narrow channels. The results of numerical simulations performed using an in-house code based on the discontinuous Galerkin finite element method are compared with experimental data. The chosen approaches and numerical methods prove themselves to be suitable for investigation of the compressible flow in narrow channels and can be used in future research in this area.
Numerický a experimentální výzkum transsonického proudění 2-D modelem mezery šroubového kompresoru
Vimmr, J. ; Bublík, O. ; Luxa, Martin ; Dvořák, Rudolf ; Šimurda, David
The main objective of the study presented here is to compare the results obtained from numerical simulations and experimental measurements of the transonic flow through the 2-D model of the male rotor-housing gap in a dry screw compressor for several clearance throat dimensions and pressure ratios.

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