Optimization and Experiment Study on Start-up Temperature Control Curve of Turbine Rotor

H-Darrieus wind turbines, due to their simple design and relatively low manufacturing costs have recently received much attention particularly for standalone applications. However start-up issues associated with their operation restricted their operation in areas of low average wind speed and encourages engineers to develop novel design. Several design proposed in this way but in most cases design came up with complex sensing mechanisms and mechanical actuators or high cost manufacturing parts. A recent rotor design called double Darrieus rotor proposed as a German patent case bridged these complexities appropriately. The aim of present study is to investigate this innovative design from aerodynamic point of view by means of validated CFD techniques. A flow-driven simulation setup based on 6DOF calculations employed in order to study rotor operation from stand still until peak performance obtained. Results from these precise modeling reveal the superiority of the proposed double-stage design in compare with the original H-Darrieus rotors in terms of start-up behavior and optimum performance.

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Fast Reconstruction Method of the Stress Field for the Steam Turbine Rotor Based On Deep Fully Convolutional Network

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4052832 ◽

2021 ◽

Author(s):

Ding Guo ◽

Tianyuan Liu ◽

Di Zhang ◽

Yonghui Xie

Keyword(s):

Finite Element ◽

Stress Distribution ◽

Stress Field ◽

Temperature Measurement ◽

Turbine Rotor ◽

Convolutional Network ◽

Fully Convolutional Network ◽

Start Up ◽

Fast Reconstruction ◽

Reconstruction Model

Abstract Since it is difficult to directly measure the transient stress of a steam turbine rotor in operation, a rotor stress field reconstruction model based on deep fully convolutional network for the start-up process is proposed. The stress distribution in the rotor can be directly predicted based on the temperature of a few measurement points. First, the finite element model is used to accurately simulate the temperature and stress field of the rotor start-up process, generating training data for the deep learning method. Next, data of only 15 temperature measurement points are arranged to predict the stress distribution in critical area of the rotor surface, with the accuracy (R2-score) reaching 0.997. The time cost of the trained neural network model at a single case is 1.42s in CPUs and 0.11s in GPUs, shortened by 97.3% and 99.8% with comparison to finite element analysis, respectively. In addition, the influence of the number of temperature measurement points and the training size are discussed, verifying the stability of the model. With the advantages of fast calculation, high accuracy and strong stability, the fast reconstruction model can effectively realize the stress prediction during start-up processes, resulting in the possibility of real-time diagnosis of rotor strength in operation.

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Experiment Study on Visualization and Start-up Performance of Closed Loop Plate Pulsating Heat Pipe with Parallel Channels

Journal of Mechanical Engineering ◽

10.3901/jme.2014.04.155 ◽

2014 ◽

Vol 50 (4) ◽

pp. 155 ◽

Cited By ~ 1

Author(s):

Weixiu SHI

Keyword(s):

Heat Pipe ◽

Closed Loop ◽

Pulsating Heat Pipe ◽

Experiment Study ◽

Start Up ◽

Parallel Channels

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Selection of the rotor heat-up rate for supercritical parameter turbines

Archives of Thermodynamics ◽

10.2478/aoter-2013-0017 ◽

2013 ◽

Vol 34 (3) ◽

pp. 89-104

Author(s):

Andrzej Rusin ◽

Marian Lipka ◽

Henryk Łukowicz

Keyword(s):

Optimal Design ◽

Turbine Rotor ◽

Design Solution ◽

Supercritical Steam Parameters ◽

Start Up ◽

Supercritical Parameter ◽

Design Calculations ◽

Steam Parameters ◽

Start Ups ◽

Selection Of

Abstract The paper presents the results of the numerical analyses for the steam turbine rotor, dedicated for the newly-designed 900 MW steam unit with supercritical steam parameters (650 °C, 30.0 MPa). Basing on the design calculations, an optimal design solution was determined. Review of the available literature on materials for turbine rotors with supercritical steam parameters was done. Then the start-ups of the turbine were simulated. Thermal and strength states were analyzed. As a result, an optimal start-up characteristic was obtained.

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Experiment Study of Vacuum Material Outgassing Rates

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.303-306.367 ◽

2013 ◽

Vol 303-306 ◽

pp. 367-371 ◽

Cited By ~ 1

Author(s):

Xue Min Sheng ◽

Xiao Bin Wu ◽

Yan Feng ◽

Meng Dong ◽

Yong Jun Cheng ◽

...

Keyword(s):

Stainless Steel ◽

Temperature Control ◽

Constant Volume ◽

Experiment Study ◽

Control Range ◽

Outgassing Rate ◽

Stainless Steel 316 ◽

Representative Material

This paper based on an equipment which measure the outgassing of vacuum material,adopt some method, constant volume, otiose flux and double channels and so on, testing the deflation of stainless steel(316、304)brass H62, aluminium2A12, and other representative material deflation.We adopt light eradiate to heat up, and the temperature control range is 23°C~300°C, we study the rule of outgassing rate at different temperature, and use QSM to analyze the component of gas.

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Effect of Sink Temperature on the Stability of the Pressure-Controlled Loop Heat Pipe

Journal of Heat Transfer ◽

10.1115/1.4043956 ◽

2019 ◽

Vol 141 (9) ◽

Author(s):

Wukchul Joung ◽

Joohyun Lee

Keyword(s):

Heat Pipe ◽

Temperature Control ◽

Control Technique ◽

Loop Heat Pipe ◽

Heat Leak ◽

Start Up ◽

Recent Emergence ◽

Compensation Chamber ◽

The Stability ◽

Pressure Controlled

Recently, a novel temperature control technique utilizing the unique thermohydraulic operating principles of the pressure-controlled loop heat pipes (PCLHPs) was proposed and proved its effectiveness, by which a faster and more stable temperature control was possible by means of the pressure control. However, due to its recent emergence, the proposed hydraulic temperature control technique has not been fully characterized in terms of the various operating parameters including the sink temperature. In this work, the effect of the sink temperature on the loop heat pipe (LHP)-based hydraulic temperature control was investigated to improve the stability of the proposed technique. Start-up characteristics and transient responses of the operating temperatures to different pressure steps and sink temperatures were examined. From the test results, it was found that there was a minimum sink temperature, which ensured a steady-state operation after the start-up and a stable hydraulic temperature control with the increasing pressure steps, due to the unstable balance between the heat leak and the liquid subcooling in the compensation chamber at low sink temperatures. In addition, the range of the stable hydraulic temperature control was extended with the increasing coolant temperature due to the decreased heat leak, which resulted in the increased pressure difference between the evaporator and the compensation chamber. Therefore, it was found and suggested that for a stable hydraulic temperature control in an extended range, it was necessary to operate the PCLHP at higher sink temperatures than the low limit.

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Influence of Creep on Low-Cycle Fatigue Life Assessment of Ultra-Supercritical Steam Turbine Rotor

Volume 7A: Structures and Dynamics ◽

10.1115/gt2014-26757 ◽

2014 ◽

Author(s):

W. Z. Wang ◽

J. H. Zhang ◽

H. F. Liu ◽

Y. Z. Liu

Keyword(s):

High Temperature ◽

Steam Turbine ◽

Fatigue Damage ◽

Low Cycle Fatigue ◽

Turbine Rotor ◽

High Temperature Creep ◽

Cycle Fatigue ◽

Term Operation ◽

Start Up

Linear damage method is widely used to calculate low-cycle fatigue damage of turbine rotor in the long-term operation without fully considering the interaction between creep and low cycle fatigue. However, with the increase of steam turbine pressure and temperature, the influence of high-temperature creep on the strain distribution of turbine rotor becomes significant. Accordingly, the strain for each start-up or shut-down process is different. In the present study, the stress and strain during 21 iterations of continuous start-up, running and shut-down processes was numerically investigated by using the finite element analysis. The influence of high-temperature creep on low cycle fatigue was analyzed in terms of equivalent strain, Mises stress and low cycle fatigue damage. The results demonstrated that the life consumption of turbine rotor due to low cycle fatigue in the long-term operation of startup, running and shutdown should be determined from the full-time coverage of the load of turbine rotor.

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The Analytical Research and Development of On-Line Monitoring Models of Thermal State for Turbine Rotor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.744.105 ◽

2013 ◽

Vol 744 ◽

pp. 105-109

Author(s):

Shi Liu ◽

Heng Liang Zhang ◽

Yan Zhou ◽

Dan Mei Xie

Keyword(s):

Power Plants ◽

Thermal Stresses ◽

Thermal State ◽

Thermal Power ◽

Turbine Rotor ◽

Limiting Factors ◽

Monitoring And Control ◽

Start Up ◽

Temperature Dependent Properties ◽

And Control

Steam turbine units are required to start up and shut down as fast as possible to improve economy and load-response ability of the units under the qualification of safety. it is important to monitor and control thermal state in turbine during operation, especially during the process of start-up and shutdown. Thermal stresses in turbine rotor in thermal power plants are the limiting factors for rapid startup, shutdown or load change. In this paper the online calculation models of temperature and thermal stress for a two-dimensional axis-symmetric object are obtained after disposing of the nonlinear factor such as temperature-dependent properties by a transformation. The model gained can be used to analyze thermal states in thick-walled components, monitoring and control online.

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