Optimization of Root Section for Ultra Long Steam Turbine Rotor Blade

0474908 - ÚT 2018 JP eng C - Conference Paper (international conference)
Hála, Jindřich - Luxa, Martin - Šimurda, David - Bobčík, M. - Novák, O. - Rudas, B. - Synáč, J.
Optimization of Root Section for Ultra Long Steam Turbine Rotor Blade.
Proceedings of the 13th International Symposium on Experimental Computational Aerothermodynamics of Internal Flows. 2017, č. článku ISAIF13-S-0049..
[International Symposium on Experimental Computational Aerothermodynamics of Internal Flows /13./. Okinawa (JP), 07.05.2017-11.05.2017]
R&D Projects: GA TA ČR(CZ) TA03020277; GA TA ČR(CZ) TH02020057
Institutional support: RVO:61388998
Keywords : steam turbine * blade cascade * root section
Subject RIV: BK - Fluid Dynamics

This study presents the comparison of aerodynamic performances of two successive designs of the root profiles for the ultra long rotor blade equipped with a straight fir-tree dovetail. Since aerodynamic and strength requirements laid upon the root section design are contradictory, it is necessary to aerodynamically optimize the design within the limits given by the foremost strength requirements. The most limiting criterion of the static strength is the size of the blade cross-section, which is determined by the number of blades in a rotor and also by the shape and size of a blade dovetail. The aerodynamic design requires mainly the zero incidence angle at the inlet of a profile and in the ideal case ensures that the load does not exceed a limit load condition. Moreover, the typical root profile cascades
are transonic with supersonic exit Mach number, therefore, the shape of a suction side and a trailing edge has to respect the transonic expansion of a working gas. In this paper, the two variants of root section profile cascades are compared and the aerodynamic qualities of both variants are verified using CFD simulation and two mutually independent experimental methods of mesuarements (optical and pneumatic).
Permanent Link: http://hdl.handle.net/11104/0273593