Optimal estimates of thermal stress and heat transfer conditions of a turbine blade in thermal fatigue tests

1974 ◽  
Vol 6 (9) ◽  
pp. 1150-1156
Author(s):  
D. F. Simbirskii ◽  
V. G. Bogdanov
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Turbine Blade ◽  
Thermal Fatigue ◽  
Fatigue Tests ◽  
Optimal Estimates

Heat Transfer and Thermal Stress Analysis of Gas Turbine Blade Considering Off-Design Condition

2021 ◽  
Author(s):  
Jeongwon Lee ◽  
Minho Bang ◽  
Hee Seung Park ◽  
Taehyun Kim ◽  
Hee Koo Moon ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Gas Turbine Blade ◽  
Thermal Stress Analysis

Effect of Heat Generation on Fatigue-Crack Propagation of Solder in Power Devices

2011 ◽  
Author(s):  
Shinji Hiramitsu ◽  
Hiroshi Shintani ◽  
Takahiro Satake ◽  
Hisashi Tanie
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Crack Propagation ◽  
Fatigue Test ◽  
Thermal Fatigue ◽  
Heat Transfer Analysis ◽  
Power Devices ◽  
Thermal Fatigue Test ◽  
Propagation Analysis

Power devices are used in inverters in a variety of electrical equipment, for instance, hybrid-power cars, electric vehicles, and generators. These types of equipment are used to decrease the negative impact on the environment, and thus, the power devices need to function effectively as electric power converters for the long-term stability of the equipment. In short, the long-term reliability, i.e., the life, of the power device is important, and a high level of reliability is required. In the development process of power devices, it is necessary to conduct thermal fatigue tests to evaluate the reliability. However, such tests are extended over a long period of time, which makes it difficult to shorten the development period. Therefore, a simulation technique needs to be developed to forecast the life of a thermal fatigue test in order to reduce the development period. During the thermal fatigue test, thermal stress is caused by differences in the line expansion coefficient between solder joint materials. Thermal stress causes crack generation and propagation in solder. The thermal resistance of a device increases steadily as the cracks grow. This raises the temperature of the device and increases thermal stress. As a result, crack propagation is accelerated. However, conventional crack propagation analysis does not take this phenomenon into account. We developed a method of crack propagation analysis that takes into account the changes in thermal and electrical boundary conditions resulting from the crack propagation. The method is a combination of electrical conduction analysis, heat transfer analysis, and crack propagation analysis. The boundary condition of the heat transfer analysis is determined from the results of the electrical conduction analysis. The boundary condition of the crack propagation analysis is determined from the results of the heat transfer analysis. The crack propagation behavior in solder is calculated by repeating these analyses. This method reproduces the drastic increase in thermal resistance in the latter part of the thermal fatigue test, and the results agree well with the experimental results. We confirmed that the temperature distribution of the device changes as the crack propagates and that thermal and electrical coupled analysis has a major effect on the prediction of fatigue life of power device products. We also revealed that the thermal fatigue life is affected by the position of the heat source and cracks.

Design and Optimization of the Internal Cooling Channels of a High Pressure Turbine Blade—Part I: Methodology

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Sergio Amaral ◽  
Tom Verstraete ◽  
René Van den Braembussche ◽  
Tony Arts
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Thermal Stress ◽  
Turbine Blade ◽  
Inlet Temperature ◽  
Analysis Tool ◽  
Internal Cooling ◽  
High Pressure Turbine ◽  
Cooling Channels ◽  
The Impact

This first paper describes the conjugate heat transfer (CHT) method and its application to the performance and lifetime prediction of a high pressure turbine blade operating at a very high inlet temperature. It is the analysis tool for the aerothermal optimization described in a second paper. The CHT method uses three separate solvers: a Navier–Stokes solver to predict the nonadiabatic external flow and heat flux, a finite element analysis (FEA) to compute the heat conduction and stress within the solid, and a 1D aerothermal model based on friction and heat transfer correlations for smooth and rib-roughened cooling channels. Special attention is given to the boundary conditions linking these solvers and to the stability of the complete CHT calculation procedure. The Larson–Miller parameter model is used to determine the creep-to-rupture failure lifetime of the blade. This model requires both the temperature and thermal stress inside the blade, calculated by the CHT and FEA. The CHT method is validated on two test cases: a gas turbine rotor blade without cooling and one with five cooling channels evenly distributed along the camber line. The metal temperature and thermal stress distribution in both blades are presented and the impact of the cooling channel geometry on lifetime is discussed.

scholarly journals Mechanisms of Oxidation Degradation of Cr12 Roller Steel during Thermal Fatigue Tests

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 450 ◽  
Author(s):  
David Bombač ◽  
Marius Gintalas ◽  
Goran Kugler ◽  
Milan Terčelj
Keyword(s):  
Surface Layer ◽  
Thermal Stress ◽  
Thermal Fatigue ◽  
Thermal Load ◽  
Oxidation Behavior ◽  
Fatigue Tests ◽  
Qualitative Assessment ◽  
Propagation Mode ◽  
Roll Surface ◽  
Oxidation Degradation

Degradation by the penetration of oxidation into the Cr12 roller steel is evaluated during thermal fatigue tests in the laboratory in the temperature range of 500–700 °C. A qualitative assessment is carried out with regard to the thermal load, the microstructure and the test temperature. The results show that the specific properties of the microstructure with respect to thermal stress and temperature have a significant influence on the oxidation behavior as well as on the crack propagation mode and crack growth. The conditions that lead to an increase in the oxidation rate and thus to premature and sudden local chipping of the roll surface layer are analyzed and explained.

Design and Optimization of the Internal Cooling Channels of a HP Turbine Blade: Part I—Methodology

2008 ◽  
Author(s):  
Sergio Amaral ◽  
Tom Verstraete ◽  
Rene´ Van den Braembussche ◽  
Tony Arts
Keyword(s):  
Heat Transfer ◽  
Thermal Stress ◽  
Turbine Blade ◽  
Turbine Rotor ◽  
Inlet Temperature ◽  
Analysis Tool ◽  
Internal Cooling ◽  
Element Analysis ◽  
Cooling Channels ◽  
The Impact

This first paper describes the Conjugate Heat Transfer (CHT) method and its application to the performance and lifetime prediction of a high pressure turbine blade operating at a very high inlet temperature. It is the analysis tool for the aerothermal optimization described in a second paper. The CHT method uses three separate solvers: a Navier-Stokes (NS) solver to predict the non-adiabatic external flow and heat flux, a Finite Element Analysis (FEA) to compute the heat conduction and stress within the solid, and a 1D aero-thermal model based on friction and heat transfer correlations for smooth and rib-roughened cooling channels. Special attention is given to the boundary conditions linking these solvers and to the stability of the complete CHT calculation procedure. The Larson-Miller parameter model is used to determine the creep-to-rupture failure lifetime of the blade. This model requires both the temperature and thermal stress inside the blade, calculated by the CHT and FEA. The CHT method is validated on two test cases: a gas turbine rotor blade without cooling and one with 5 cooling channels evenly distributed along the camber line. The metal temperature and thermal stress distribution in both blades are presented and the impact of the cooling channel geometry on lifetime is discussed.

Experimental and theoretical determination of thermal stress and heat transfer for a turbine blade, using high-temperature thin film thermocouples

1974 ◽  
Vol 6 (7) ◽  
pp. 826-831
Author(s):  
D. F. Simbirskii ◽  
V. G. Bogdanov ◽  
G. N. Tret'yachenko ◽  
R. I. Kuriat ◽  
A. P. Voloshchenko
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Thermal Stress ◽  
High Temperature ◽  
Turbine Blade ◽  
Theoretical Determination ◽  
Thin Film Thermocouples

Thermal Fatigue Properties of the Fin in the Boilers

2007 ◽  
Vol 353-358 ◽  
pp. 315-318 ◽  
Author(s):  
Yukihiro Tokunaga ◽  
Nu Yan ◽  
Daisuke Yonekura ◽  
Riichi Murakami
Keyword(s):  
Heat Transfer ◽  
Fatigue Test ◽  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Test Machine ◽  
Element Analysis ◽  
Heat Transfer Efficiency ◽  
Heating And Cooling

In order to improve the heat transfer efficiency, the fins are commonly used in the industrial boiler in Japan. In actual application, the thermal fatigue due to the cyclic change of temperature usually occurs in the fins. The thermal fatigue tests were carried out by using the thermal fatigue apparatus designed. The designed testing apparatus can apply thermal load to the fin by giving heating and cooling alternatively. The fatigue cracks can be observed in the vicinity of the toe in the thermal fatigue test. The heat transfer coefficient and the thermal stress were calculated by using Finite Element Analysis (FEA) method. The fatigue experiments of the fins were also conducted using electro-hydraulic servo fatigue test machine in the laboratory. The results of thermal fatigue experiments were discussed by comparing with those of the mechanical fatigue experiments.

Effects of Rotation on Blade Surface Heat Transfer: An Experimental Investigation

1997 ◽  
Author(s):  
Roger W. Moss ◽  
Roger W. Ainsworth ◽  
Tom Garside
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Experimental Investigation ◽  
Turbine Blade ◽  
Time History ◽  
Surface Heat ◽  
Blade Surface ◽  
Surface Heat Transfer ◽  
Effects Of Rotation ◽  
Wake Passing

Measurements of turbine blade surface heat transfer in a transient rotor facility are compared with predictions and equivalent cascade data. The rotating measurements involved both forwards and reverse rotation (wake free) experiments. The use of thin-film gauges in the Oxford Rotor Facility provides both time-mean heat transfer levels and the unsteady time history. The time-mean level is not significantly affected by turbulence in the wake; this contrasts with the cascade response to freestream turbulence and simulated wake passing. Heat transfer predictions show the extent to which such phenomena are successfully modelled by a time-steady code. The accurate prediction of transition is seen to be crucial if useful predictions are to be obtained.

scholarly journals Heat Transfer in Rotating Serpentine Passages With Trips Normal to the Flow

1992 ◽  
Vol 114 (4) ◽  
pp. 847-857 ◽  
Author(s):  
J. H. Wagner ◽  
B. V. Johnson ◽  
R. A. Graziani ◽  
F. C. Yeh
Keyword(s):  
Heat Transfer ◽  
Turbine Blade ◽  
Large Scale ◽  
Flow Direction ◽  
Operating Conditions ◽  
Transfer Model ◽  
Transfer Coefficients ◽  
Flow Equations ◽  
Turbine Blade Cooling ◽  
Heat Transfer Coefficients

Experiments were conducted to determine the effects of buoyancy and Coriolis forces on heat transfer in turbine blade internal coolant passages. The experiments were conducted with a large-scale, multipass, heat transfer model with both radially inward and outward flow. Trip strips on the leading and trailing surfaces of the radial coolant passages were used to produce the rough walls. An analysis of the governing flow equations showed that four parameters influence the heat transfer in rotating passages: coolant-to-wall temperature ratio, Rossby number, Reynolds number, and radius-to-passage hydraulic diameter ratio. The first three of these four parameters were varied over ranges that are typical of advanced gas turbine engine operating conditions. Results were correlated and compared to previous results from stationary and rotating similar models with trip strips. The heat transfer coefficients on surfaces, where the heat transfer increased with rotation and buoyancy, varied by as much as a factor of four. Maximum values of the heat transfer coefficients with high rotation were only slightly above the highest levels obtained with the smooth wall model. The heat transfer coefficients on surfaces where the heat transfer decreased with rotation, varied by as much as a factor of three due to rotation and buoyancy. It was concluded that both Coriolis and buoyancy effects must be considered in turbine blade cooling designs with trip strips and that the effects of rotation were markedly different depending upon the flow direction.

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