The Vibration Characteristics of Steam Turbine Blades with New Friction Damping Structures

2013 ◽  
Vol 312 ◽  
pp. 268-272
Author(s):  
Jun Wu ◽  
Rui Shan Yuan ◽  
Peng Fei Zhao ◽  
Yong Hui Xie
Keyword(s):  
Finite Element ◽  
Steam Turbine ◽  
Contact Surface ◽  
Turbine Blades ◽  
Harmonic Balance Method ◽  
Equivalent Stiffness ◽  
Friction Damping ◽  
Element Analysis ◽  
Steam Turbine Blades ◽  
Stiffness And Damping

The hysteresis curves that show the relationship between the tangential friction force and relative displacement of the contact surface were measured. The equivalent stiffness and damping of the friction contact surface under different normal loads were computed by harmonic balance method (HBM). The finite element model of steam turbine blades with new friction damping structures was established. The effects of friction between the contact surfaces were considered by using spring damping elements to connect the friction damper and the blade. The equivalent stiffness and damping which were calculated by the experiment results were applied to the spring damping elements under different rotational speeds. Based on the natural frequencies which were computed by finite element analysis, the Campbell diagram of the whole blades was obtained. The results showed that there were no 3-coincide points in the working speed range.

Mechanical Integrity and Design Analysis Suite (MIDAS): A Tool for Rapid Finite Element Analysis (FEA) of Steam Turbine Blades

2016 ◽  
Author(s):  
Periklis Lolis ◽  
Cesare Guardino ◽  
Trevor Brown ◽  
Jonathan Henson
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Steam Turbine ◽  
Turbine Blades ◽  
Vibrational Analysis ◽  
Simulation Method ◽  
Design Analysis ◽  
Element Analysis ◽  
Mechanical Integrity ◽  
Steam Turbine Blades

Even though Finite Element Analysis (FEA) is considered to be an accurate static and dynamic simulation method, it is used only to verify the Mechanical Integrity (MI) of Steam Turbine (ST) blades, due to the time required to set up and perform a typical FEA. Furthermore, the complexity of the blade model results in convergence issues that further increase the analysis time, which can last several days. Instead, faster, lower order empirical tools with increased conservatism are preferred for the design phase. Based on parametric steam turbine blades definition, the Mechanical Integrity and Design Analysis Suite (MIDAS) provides a platform for rapid, fully-automated 3D model generation and FEA. The analysis applies simplified contact interactions on a fully structured mesh, aiming primarily for model convergence in a short time, whilst maintaining the required accuracy. In order to verify that, an extended comparison of MIDAS static and vibrational analysis results with the state-of-the-art FEA and experimental measurements is performed. Therefore, with MIDAS an accurate full FEA is completed within few minutes for each blade, speeding up the MI validation process and enabling its use at the design of every ST blade. Furthermore, the use of FEA contributes to an extended blade application envelope and optimised blade geometry. As a result, MIDAS presents several benefits to new and existing ST customers including increased operational flexibility, extended blade life, faster delivery of the ST cylinders at a lower acquisition cost and extended outage intervals.

Diagnostics and monitoring of the operating condition of steam-turbine blades

2007 ◽  
Vol 41 (5) ◽  
pp. 295-301
Author(s):  
A. I. Danilin ◽  
S. I. Adamov ◽  
A. Zh. Chernyavskii ◽  
M. I. Serpokrylov
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Operating Condition ◽  
Steam Turbine Blades

Water-droplet erosion behavior of high-velocity oxygen-fuel-sprayed coatings for steam turbine blades

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Dingjun Li ◽  
Peng Jiang ◽  
Fan Sun ◽  
Xiaohu Yuan ◽  
Jianpu Zhang ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Water Droplet ◽  
Erosion Resistance ◽  
Turbine Blades ◽  
Impingement Angle ◽  
Erosion Behavior ◽  
Water Droplet Erosion ◽  
Steam Turbine Blades ◽  
Oxygen Fuel ◽  
Sprayed Coatings

Abstract The water-droplet erosion of low-pressure steam turbine blades under wet steam environments can alter the vibration characteristics of the blade, and lead to its premature failure. Using high-velocity oxygen-fuel (HVOF) sprayed water-droplet erosion resistant coating is beneficial in preventing the erosion failure, while the erosion behavior of such coatings is still not revealed so far. Here, we examined the water-droplet erosion resistance of Cr3C2–25NiCr and WC–10Co–4Cr HVOF sprayed coatings using a pulsed water jet device with different impingement angles. Combined with microscopic characterization, indentation, and adhesion tests, we found that: (1) both of the coatings exhibited a similar three-stage erosion behavior, from the formation of discrete erosion surface cavities and continuous grooves to the broadening and deepening of the groove, (2) the erosion rate accelerates with the increasing impingement angle of the water jet; besides, the impingement angle had a nonlinear effect on the cumulative mass loss, and 30° sample exhibited the smallest mass loss per unit area (3) an improvement in the interfacial adhesion strength, fracture toughness, and hardness of the coating enhanced the water-droplet erosion resistance. These results provide guidance pertaining to the engineering application of water erosion protective coatings on steam turbine blades.

On real-time creep damage prediction for steam turbine

2022 ◽  
pp. 014233122110689
Author(s):  
Yongjian Sun ◽  
Bo Xu
Keyword(s):  
Finite Element ◽  
Steam Turbine ◽  
Real Time ◽  
Creep Damage ◽  
Element Model ◽  
Turbine Rotor ◽  
Theoretical Research ◽  
Element Analysis ◽  
Damage Prediction ◽  
Time Calculation

In this paper, in order to solve the calculation problem of creep damage of steam turbine rotor, a real-time calculation method based on finite element model is proposed. The temperature field and stress field of the turbine rotor are calculated using finite element analysis software. The temperature data and stress data of the crucial positions are extracted. The data of temperature, pressure, rotational speed, and stress relating to creep damage calculation are normalized. A real-time creep stress calculation model is established by multiple regression method. After that, the relation between stress and damage function is analyzed and fitted, and creep damage is calculated in real-time. A creep damage real-time calculation system is constructed for practical turbine engineering. Finally, a numerical simulation experiment is designed and carried out to verify the effectiveness of this novel approach. Contributions of present work are that a practical solution for real-time creep damage prediction of steam turbine is supplied. It relates the real-time creep damage prediction to process parameters of steam turbine, and it bridges the gap between the theoretical research works and practical engineering.

Titanium steam turbine blades

JOM ◽  
1989 ◽  
Vol 41 (3) ◽  
pp. 31-35
Author(s):  
R.R. Jaffee
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Steam Turbine Blades

Corrosive resistance of nitride coatings of steam turbine blades

2009 ◽  
Vol 56 (2) ◽  
pp. 91-96 ◽  
Author(s):  
V. I. Nikitin ◽  
A. M. Smyslov ◽  
A. S. Lisyanskii ◽  
M. K. Smyslova ◽  
O. N. Simin ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Nitride Coatings ◽  
Steam Turbine Blades ◽  
Corrosive Resistance
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