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Two-stage steam turbine under variable operational parameters

Hoznedl M., Bednar L., Tajc L.

Mechanics and Mechanical Engineering

2011

Vol. 15, nr 3

249-259

Experimental research on steam flow through a two-stage turbine is presented. Change of pressure and velocity ratio in individual stages is studied. The effect of the Reynolds number and the Mach number on the thermodynamic efficiency of individual stages as well as the entire turbine is evaluated. Steam flows through the blades and steam leakages through the shroud sealing and the shaft sealing are described.

Exhaust Hood for the Steam Turbines of Single - Flow Arrangement

Tajc L., Bednar L., Poskocilova M., Hoznedl M.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2005

nr 128, vol. 2

547-556

The effect of the front wall inclination and the mutual position of casing and diffuser on thermodynamical losses have been investigated. The effect of the outer-casing shape variation was studied. In addition, the influence of taking-out for bearing cover on the loss factor has also been tasted. The computational model employed as the input a measured inlet velocity profile. Some internal rib and reinforcement were neglected in the model. A 3D model was used, but the symmetry of the flow field was taken into account. Only half of the flow channel was being treated in the computation. The results were compared with the available experimental data.

Control valves for turbines of large output

Tajc L., Bednar L., Sfastny M.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 114

209-218

Intensive vibration of inlet piping system was discovered during test period of 1000 MW SKODA turbine operating with inlet-saturated steam. Unwanted oscillations of the piping system required new view on construction of control parts of the turbine. Intensive research of valve models took place, numerical simulation were done. The original alternative of the valve with shaped plug was compared with the valve characterized by flat-bottom-plug and a muffler.