Optimization of Root Section for Ultra-long Steam Turbine Rotor Blade  

作　　者：Jindrich Hala Martin Luxa David Simurda marek Bobcik Ondrej Novak Bartolomej Rudas Jaroslav Synac 

机构地区：[1]Institute of Thermomechanics of The Czech Academy of Sciences, Prague, Czech Republic [2]Doosan Skoda Power Ltd, Pilsen, Czech Republic [3]Faculty of Mechanical Engineering, University of West Bohemia, Pilsen, Czech Republic

出　　处：《Journal of Thermal Science》2018年第2期95-102,共8页热科学学报（英文版）

基　　金：the Technology Agency of the Czech Republic,which supported this research under grants No.TA03020277 and TH02020057;Institutional support RVO61388998

摘　　要：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 Math number, therefore, the shape of a suction side and a trailing edge has to respect 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 measurements （optical and pneumatic）.

关 键 词：steam turbine blade cascade root section 

分 类 号：TK263.61[动力工程及工程热物理—动力机械及工程]