Prevention of Hazardous Failure of the Turbine Rotor Due to Its Overspeed

[摘要] Causes of defects that can lead to the turbine rotor overspeed and subsequent hazardous consequences are considered. Methods of preventing unacceptable overspeed and confirmation of the sufficient strength of the turbine rotor are analyzed. Particular attention is paid to the developed method of calculating burst speed of the rotor. A comparison of the numerical and experimental data on basis of relation between radial displacements during spin tests, burst speed, high-speed image acquisition, fracture origin and fracture confirms possibility to use the developed method of calculations. The presented method allows to adjust the value of a disc rotation rate during certification spin tests to ensure that a disc with the worst mechanical properties will not burst in operation and to take into account differences in the design and loading conditions between the disc for spin tests and disc for operation. If the identification of model's material parameters was performed based on disc's tensile tests and spin tests, then for a disc of another design from the same material only calculations can be used.

[发布机构] Central Institute of Aviation Motors (CIAM), Aviamotornaya st. 2, Moscow; 111116, Russia^1

[效力级别] 无线电电子学 [学科分类] 航空航天科学

[关键词] Fracture origins;Identification of model;Loading condition;Material parameter;Method of calculation;Radial displacements;Rotation rate;Turbine rotor