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Thermodynamics cycle of gas-cooled fast reactor

100%

Polansky J.

tom Vol. 22, nr 2

585--592

This paper deals with the thermo-hydraulic aspect of gas cooled fast 4 generation reactor. The paper is focused on the comparison of direct and indirect strategy of thermodynamics cycle of helium cooled reactor from the thermodynamics and turbomachinary point of view. The analyses respect pressure looses at all major part of the equipment - reactor, heat exchanger, pipe lines, etc. The compressor and gas turbines efficiency are includes in calculation as well.The working fluid in primary circuit is helium. In the secondary circuit a mixture of helium and nitrogen is considered. The Cycle characteristic point and efficiency calculation reflects mixture properties of the real gas. Calculation point out the influence of mixture composition on the basic structural parameters of the turbines, compressor and heat exchangers. Thermodynamics cycle efficiency, specific heat input/output , heat flux and cycle work will be presented as characteristic parameters.

Radial compressor unstable operation modelling

63%

Polansky J. , Hocko M.

2014

tom nr 145

97--98

Unstable operation of a compressor is a dangerous phenomenon which occurs during certain operating regimes of compressors in engine turbo-compressors and also in combustion turbines used in transport and stationary energetics equipment. It is manifested by a sudden change of pressure and speed of air flow at the output of the compressor and characteristic sounds, which result in intense vibration of the rotor blades and changes to the character of air flow in other parts of the device. Surge or stall can result in interruption of engine operation, or its destruction due to mechanical damage to the compressor blades or heat damage to the blades of the gas turbine. This is why the formation of unstable compressor modes is inadmissible and a great deal of attention is devoted to preventing it.

Metodic of set up the efficiency of axial turbin stage

51%

Jenik J. , Polansky J. , Wendl M.

tom nr 21

107-112

This paper is focused on a metodic of set up the efficiency of the axial turbine stage if we are using the CFD Fluent and influence of the numeric setting and boundary conditions for the computation where the compressible and the incompressible fluid is used.

Flow computations and experimental investigation of exhaust hoods

51%

Tajć L. , Polansky J. , Knourek J. , Feldberg L. A.

1999

tom nr 115

371--378

The results are presented here of a piece of experimental research, the aim of which was to find the most suitable shapes of all parts of the double-flow design of the exhaust hood in a steam turbine. Various forms of the walls of the casing and their influence upon the loss coefficient are described. Attention was paid to the process of blowing the steam into the boundary layer on the wall of the diffuser and stating the overall loss. The computations of the flow in the diffuser proper are presented and the influence of the density of the grid and the influence of the rotation of flow are shown. The actual inlet flow parameters are taken into consideration.