scholarly journals Investigation of bowing of steam turbine rotor during long term service.

1984 ◽  
Vol 24 (2) ◽  
pp. 107-112 ◽  
Author(s):  
Seishin KIRIHARA ◽  
Masao SHIGA ◽  
Mitsuo KURIYAMA ◽  
Ryoichi SASAKI ◽  
Katsukuni HISANO
Keyword(s):  
Steam Turbine ◽  
Turbine Rotor ◽  
Steam Turbine Rotor

Fault Analysis and Optimal Balancing of Bowing of Steam Turbine Rotor Under Long-Term Service

2015 ◽  
Vol 137 (11) ◽  
Author(s):  
Jingming Chen ◽  
Dongxiang Jiang ◽  
Chao Liu
Keyword(s):  
Steam Turbine ◽  
Traditional Approach ◽  
Turbine Rotor ◽  
Fault Analysis ◽  
Time Service ◽  
Steam Turbine Rotor ◽  
Start Up ◽  
Long Time

In recent years, bowing of steam turbine rotor under long time service occurs in several high-parameter units. Collected data show that the bending of the haywire rotor is increasing continuously, which results in excessive vibration in operation and even causes over-limit vibration during start-up. In order to suppress the vibration, balancing is utilized in field with the traditional approach that the balancing mass is placed in the section of the rotor close to the bearing. However, the balancing with the traditional approach could only reduce the vibration temporarily. In the long time scale, the bowing is still propagating or even gets worse after the balancing. To determine the cause of bowing and form optimal balancing approach, analysis is carried out in this work including: (i) fault cause and its treatment of bowing of steam turbine rotor under long time service is studied with elastic–plastic mechanics and creep mechanism taken in account; (ii) a case study was carried out, where the bowing process was simulated and validated with the field monitoring data; (iii) the phenomenon of the traditional balancing method was illustrated with rotordynamics analysis, where the influence of whirling is included. Based on the analysis, the cause of bowing is determined as uneven creep effect. And the balancing method would influence the whirling mode, which would worsen bowing in the traditional balancing method. Based on this conclusion, an optimized balancing method was developed to reduce the vibration and prevent bowing propagation simultaneously.

scholarly journals STRUCTURE AND MECHANICAL PROPERTIES OF 21HMF STEEL STEAM TURBINE ROTOR MATERIALS AFTER LONG-TERM OPERATION FOR A TIME SIGNIFICANTLY EXCEEDING THE DESIGN TIME

2021 ◽  
Vol 73 (2) ◽  
pp. 40-55
Author(s):  
Joanna FURMANEK ◽  
Janusz DOBRZAŃSKI
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Functional Properties ◽  
Turbine Rotor ◽  
Working Time ◽  
Term Operation ◽  
Steam Turbine Rotor ◽  
Design Time ◽  
Turbine Rotors

The article presents the results of tests of materials for steam turbine rotors with various degrees of depletion in order to determine the suitability of these components for further operation after significantly exceeding the design working time on the basis of the assessment of the microstructure condition and a set of functional properties.

scholarly journals A linear cascade tunnel for flow investigations of steam turbine rotor tip blades in subsonic nucleating flows

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Vital Kumar Yadav Pillala ◽  
B. V. S. S. S. Prasad ◽  
N. Sitaram ◽  
M. Mahendran ◽  
Debasish Biswas ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Turbine Rotor ◽  
Turbine Cascade ◽  
Flow Measurements ◽  
Linear Cascade ◽  
Dry Air ◽  
Steam Turbine Rotor ◽  
Pressure Distributions ◽  
Working Medium ◽  
Exit Mach Number

AbstractThe paper presents details of a unique experimental facility along with necessary accessories and instrumentation for testing steam turbine cascade blades in wet and nucleating steam. A steam turbine rotor tip cascade is chosen for flow investigations. Cascade inlet flow measurements show uniform conditions with dry air and steam and dry air mixture of different ratios. Exit flow surveys indicate that excellent flow periodicity is obtained. Blade surface static pressure and exit total pressure distributions are also presented with dry air and with steam and dry air mixture of different ratios as the working medium at an exit Mach number of 0.52.

scholarly journals On the creep fatigue and creep rupture behaviours of 9–12% Cr steam turbine rotor

2019 ◽  
Vol 76 ◽  
pp. 263-278 ◽  
Author(s):  
Xuanchen Zhu ◽  
Haofeng Chen ◽  
Fuzhen Xuan ◽  
Xiaohui Chen
Keyword(s):  
Steam Turbine ◽  
Turbine Rotor ◽  
Creep Rupture ◽  
Steam Turbine Rotor ◽  
Creep Fatigue

Effects of Laser Cladding Layers Width on Total Indicated Runout Characteristics of Steam Turbine Rotor Surface

2017 ◽  
Vol 46 (3) ◽  
pp. 612-616
Author(s):  
Guo Shirui ◽  
Shang Huichao ◽  
Cui Lujun ◽  
Guo Xiaofeng ◽  
Yao Jianhua
Keyword(s):  
Steam Turbine ◽  
Laser Cladding ◽  
Turbine Rotor ◽  
Steam Turbine Rotor ◽  
Rotor Surface ◽  
Cladding Layers
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