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1
Content available Changes in aerodynamic parameters for 5-stage steam turbine during warming and gradual start-up to nominal operating parameters
Hoznedl M., Bednář L., Tajč L.
Transactions of the Institute of Fluid-Flow Machinery
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2016
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nr 134
45--62
EN
The results of experiments on the 5-stage steam turbine are presented. The parameters of individual stages as well as the whole turbine are observed during the gradual start-up to nominal operating parameters. The pressures and temperatures are shown at stages in idling, heating up the experimental turbine and during the transition to operating speed. A greater attention is devoted to three selected operational conditions with different processed enthalpy drops. Problems with efficiency and enthalpy drops measurement during warming are described. The attempts to measure flow parameters quickly and without time for heating of turbine casings and other parts are often in the experimental research caused byprice of the survey. This contributionÞs task is to inform about these situations and to avoid confused and untrue results obtained by somewhat hasty measurements due to reduction and optimisation of costs.
2
Content available remote Influence of operating parameters on thermodynamic efficiency of experimental turbine with 1000 MW HP part
Hoznedl M., Bednář L., Miczán M., Tajč L.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2014
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nr 146
79--87
EN
The results of experiments performed on a 5-stage steam turbine are presented. Operating parameters close to the real design parameters are simulated. The modes with the slightly different input temperature and pressure are also considered. Thermodynamic efficiency defined based on the torque moment by measuring on a water brake is compared with efficiency evaluated from the temperatures and pressures. An analysis of velocity ratios and efficiency of individual stages is carried out.
3
Content available remote Two-stage steam turbine under variable operational parameters
Hoznedl M., Bednar L., Tajc L.
Mechanics and Mechanical Engineering
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2011
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Vol. 15, nr 3
249-259
EN
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.
4
Content available remote Results of the experimental testing of a stage with 3D shaped blades and design of a new stage
Hoznedl M, Milčák P
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2008
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nr 133
229--236
EN
The paper shows some results from the experimental testing of a turbine stage equipped with 3D shaped stator blades. Data measured behind the stator and rotor clearly revealed the difference between Compound Lean and Compound Twist blades. The effects of the 3D stator shaping on flows are presented in comparison with classical Prismatic blades. The design of a new stage with 3D shaped stator and also rotor blades is described.
5
Content available remote 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
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2005
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nr 128, vol. 2
547-556
EN
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.
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