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2 Prace Naukowe Politechniki Warszawskiej. Mechanika

2 2001

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Wake-induced mechanism of laminar-turbulent transition on turbine blades

Epik E., Suprun T., Wierciński Z.

Prace Naukowe Politechniki Warszawskiej. Mechanika

2001

z. 190

53-57

The results of experimental investigation of boundary layer internal structure are presented in the case of an origin of laminar-turbulent transition, induced by moving cylinder. It is shown that the cylinder hesitations cause the earlier transition and the growth of transport coefficients in preceding to transition laminar boundary layer. The mechanism of intensification is grounded by changes of instability energy phases in the wall part of boundary layer, when critical thickness reaches.

The features of numerical modelling of transport processes in flow passage of heat power equipment

Epik E.

Prace Naukowe Politechniki Warszawskiej. Mechanika

2001

z. 190

59-63

The results of experimental investigations of heat and impulse transport in turbulized flows typical for flow passage of heat power equipment are considered from the point of view of their further application in turbulence models. The special attention is paid to analysis of unpredictable peculiarities of complex processes developing in flows with elevated turbulence (in particular to origin of an overlayer and to changes of turbulent viscosity in it, to choice of characteristic turbulence scale and to its role in increasing of transport coefficients, to development of untraditional types of boundary layers and to selective interaction between them and external flow). The importance of using of reliable experimental data and necessity of their adequate reflection in numerical modelling is emphasized.