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Turbine cascades of last stage blades for wide range of operating conditions

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    0518677 - ÚT 2020 RIV CH eng J - Journal Article
    Novák, O. - Bobčík, M. - Luxa, Martin - Fořt, J. - Rudas, B. - Synáč, J. - Šimurda, David - Fürst, J. - Halama, J. - Hric, V. - Příhoda, Jaromír - Šimka, Z.
    Turbine cascades of last stage blades for wide range of operating conditions.
    International Journal of Turbomachinery, Propulsion and Power. Roč. 33, č. 4 (2019), s. 1-10. E-ISSN 2504-186X.
    [European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019 /13./. Lausanne, 08.04.2019-12.04.2019]
    R&D Projects: GA TA ČR TH02020057
    Institutional support: RVO:61388998
    Keywords : turbine * cascade * last stage blade * CFD * experimental validation
    Subject RIV: BK - Fluid Dynamics
    OBOR OECD: Applied mechanics

    Recent trends in the electric energy market such as biomass, waste incineration or combined cycle power plants require innovative solutions in steam turbine design. Variable operating conditions cause significant changes in flow field surrounding the steam turbine last stage blades. Therefore, the enlargement of operating range for last stage blades presents new challenges in design of turbine cascades. Several turbine cascades were designed and analyzed by commercial and in-house software of CTU Prague. Selected profiles were experimentally validated in the high-speed wind tunnel for 2D cascade measurements of the Institute of Thermomechanics of the Czech Academy of Sciences which is equipped by an adjustable supersonic inlet nozzle, perforated inserts at side walls and adjustable perforated tailboard. Comparisons are presented of numerical results with optical and pneumatic measurements for a wide range of inlet and outlet Mach numbers for optimized hub and tip profile cascades.
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