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Surface roughness effects on losses in turbine stages

100%

Tajč L. , Bednář L. , Jůza Z. , Valenta R.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

tom nr 133

343--350

The influence of surface roughness on energetic losses in a turbine blade cascade is presented here. The impact of Reynolds and Mach number by the different surface roughness on losses is described. Results from experimental steam turbine are compared with information received after investigation on a linear blade cascade in an aerodynamic wind tunnel.

Influence of operating parameters on thermodynamic efficiency of experimental turbine with 1000 MW HP part

100%

Hoznedl M. , Bednář L. , Miczán M. , Tajč L.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2014

tom nr 146

79--87

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.

Changes in aerodynamic parameters for 5-stage steam turbine during warming and gradual start-up to nominal operating parameters

100%

Hoznedl M. , Bednář L. , Tajč L.

Transactions of the Institute of Fluid-Flow Machinery

2016

tom nr 134

45--62

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.