Browsing Acta Polytechnica CTU Proceedings. 2018, vol. 20 by Issue Date

Now showing items 1-16 of 16

    • EXPERIMENTAL AND NUMERICAL STUDY OF CONTROLLED FLUTTER TESTING IN A LINEAR TURBINE BLADE CASCADE 

      Author: Sláma, Václav; Rudas, Bartoloměj; Eret, Petr; Tsymbalyuk, Volodymyr; Ira, Jiří; Macalka, Aleš; Pinelli, Lorenzo; Vanti, Federico; Arnone, Andrea; Lo Balbo, Antonio Alfio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In this paper, experimental testing of flutter and numerical simulations using a commercial code ANSYS CFX and an in-house code TRAF are performed on an oscillating linear cascade of turbine blades installed in a subsonic ...

    • AMBIENT TEMPERATURE IMPACT ON MICRO GAS TURBINES: EXPERIMENTAL CHARACTERIZATION 

      Author: Rossi, Iacopo; Traverso, Alberto
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In the panorama of gas turbines for energy production, a great relevance is given to performance impact of the ambient conditions. Under the influence of ambient temperature, humidity and other factors, the engine performance ...

    • REGARDING CERTAIN AERODYNAMIC SOURCES OF NON-STATIONARY FORCE LOADS ON TURBINE PROFILES 

      Author: Radnic, Tomáš; Luxa, Martin; Šimurda, David
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The paper deals with selected phenomena present in a blade cascade flow field. The presented research was performed on prismatic blade cascades composed mostly of the tip and root sections of the last stage rotor blade of ...

    • MARKET AND DEVELOPMENT TRENDS IN COGENERATION AND COMBINED HEAT AND POWER PLANTS 

      Author: Slad, Jan; Pickard, Andreas; Strobelt, Frank
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The transition of energy mix in Europe is placing greater focus on energy efficiency. Lawmakers in some of EU countries have already recognized that combined heat and power generation (cogeneration, CHP) can help increase ...

    • CFD FLOW ANALYSIS OF THE CANTILEVER MICRO-TURBINE 

      Author: Syka, Tomáš; Weiß, Andreas P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The article deals with a description of results from research and development of the cantilever micro-turbine designed for the ORC power plants. The experimental turbine stage and used numerical models are briefly described. ...

    • ISENTROPIC EFFICIENCY OF CENTRIFUGAL COMPRESSOR WORKING WITH REAL GAS 

      Author: Oldřich, Jiří
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The contribution deals with calculation of isentropic efficiency and also with calculation of isentropic process of real gas or gaseous mixtures. The method is based on numerical solution of basic definitional equation of ...

    • THERMO-MECHANICAL FATIGUE ANALYSIS OF A STEAM TURBINE SHAFT 

      Author: Nesládek, Martin; Jurenka, Josef; Bartošák, Michal; Růžička, Milan; Lutovinov, Maxim; Papuga, Jan; Procházka, Radek; Džugan, Jan; Měšťánek, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Increasing demands on the flexibility of steam turbines due to the use of renewable energy sources substantially alters the fatigue strength requirements of components of these devices. Rapid start-ups as well as the ...

    • TURBOMACHINES 2018 

      Author: Foreword, Editorial,
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The Turbostroje / Turbomachines conference has been held regularly since 1999, alternately prepared by A.S.I. Regional Branch in Pilsen and in Prague. In 2018 main topic is "Flexible Fossil Power Plants for the Future ...

    • EXPERIMENTAL AND NUMERICAL RESEARCH ON FLOW IN THE LAST STAGE OF 1090MW STEAM TURBINE 

      Author: Hoznedl, Michal; Sedlák, Kamil
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The paper deals with experimental and numerical research in the last stage of real 1090MW steam turbine with the last steel blade length 1220mm placed in nuclear power station. The last stage was equipped with twelve static ...

    • THE EFFECT OF NOTCHES ON THE FATIGUE LIFE OF A NICKEL-BASE GAS TURBINE DISK MATERIAL 

      Author: Eriksson, Robert; Moverare, Johan; Chen, Zhe; Simonsson, Kjell
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Gas turbine disks carry significant load under high temperatures and may be subject to fatigue failure. Disks contain several notches in the form of the fir tree blade attachments. Low cycle fatigue tests were performed ...

    • AN EXPERIMENTAL STUDY OF THE COARSE DROPLETS FORMATION 

      Author: Bartoš, Ondřej; Měšťanová, Lucie
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The paper introduces the first results from a new steam/air wind tunnel built in order to study the coarse water droplets in steam turbines and their formation. The wind tunnel was designed with the aim to have a testing ...

    • EXPERIMENTAL AND NUMERICAL ASSESSMENT OF A LAST STAGE ST BLADE DAMPING AT LOW LOAD OPERATION 

      Author: Bessone, Andrea; Carassale, Luigi; Guida, Roberto; Kubín, Zdeněk; Lo Balbo, Antonio Alfio; Brunenghi, Michela Marrè; Pinelli, Lorenzo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      As LP steam turbines are requested to work at strong part-loads, LSB stalled and unstalled flutter may occur. Testing on a downscaled steam turbine in T10MW test plant have been carried out to measure LSB aggregated damping ...

    • HIGH TEMPERATURE CYCLIC TEST RIG – A NEW RIG FOR HOT GAS PARTS LIFETIME VALIDATION 

      Author: Ammer, Wieland; Raddatz, Mario; Gampe, Uwe; Nussbaum, Julien; Ruedel, Uwe; Kellerer, Rudolf
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      Flexible gas turbine operation requires adapted hot gas parts design and lifetime assessment methods. The High Temperature Cyclic Test Rig (HTCTR) is developed to cyclically test internally cooled components from combustor ...

    • COMPARISON OF TOTAL PRESSURE FLUCTUATIONS IN STEAM TURBINE STAGES WITH DIFFERENT DEGREE OF REACTION 

      Author: Jelínek, Tomáš; Němec, Martin; Milčák, Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      The contribution deals with analysis of unsteady pressure measurement in one and half axial turbine stages. The measurement was performed in VZLU air test turbine. Two stages geometries with different degree of reaction ...

    • CALIBRATION OF BTT MEASUREMENT WITH RESPECT TO SENSOR POSITION OVER SHROUDED LSB 

      Author: Dadáková, Tereza; Kubín, Zdeněk
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      In order to increase efficiency and reliability of steam turbines, last stage blades are equipped with mid-span tie-boss and shroud. We can use Blade Tip-Timing method (BTT) to measure vibration of shrouded blades, but the ...

    • BTT & RFLB - THE OPTIMUM SET FOR STEAM TURBINE BLADES MONITORING 

      Author: Balda, Miroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      BTT, Blade Tip Timing system, is a commercially available system generating files of precise times of blade tips when passing sensors attached in a machine stator. RFLB, Residual Fatigue Life of Blades, is a postprocessor ...