Coupled Thermal-Structural Analysis of Generator For sCO2 Turbomachinery

2021 ◽  
Author(s):  
Ramesha Guntanur ◽  
Ashutosh Patel ◽  
Vijay Biradar ◽  
Pramod Kumar
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Distribution ◽  
Structural Analysis ◽  
Contact Pressure ◽  
Temperature Rise ◽  
Thermal Stresses ◽  
Flow Path ◽  
Heat Losses ◽  
Positive Contact

Abstract This paper presents the coupled thermal and structural analysis of the rotating components of the generator using ABAQUS finite element solver. The interference between shaft and rotor is optimized to have a positive contact pressure and also minimize the stresses in the laminate at all operating speeds. Thermal analysis is performed to simulate the temperature distribution arising from the heat losses of generator. The flow path of the coolant is designed through the shaft to minimise the temperature rise of the generator. The resulting changes in the contact pressure between laminated disc and shaft is computed using sequentially coupled thermal and structural analysis. The thermal stresses of rotor are computed estimated and the design is optimized for transmitting torque at different operating speeds.

Naval Ship Structures Exposed to Rocket Thermal and Pressure Loads

2009 ◽  
Vol 53 (03) ◽  
pp. 159-169
Author(s):  
Donatella Mascia ◽  
Maria L. Tuveri
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Thermal Stresses ◽  
Ship Structures ◽  
Rocket Launch ◽  
Time Space ◽  
Naval Ship

Effects of rocket launch on a naval ship structures located near a rocket gun are studied. Using a finite element thermal analysis, the temperatures along the thickness are determined and then applied to the structure to investigate the thermal stresses distribution. Stresses caused by time/space dependent pressure loads are investigated as well, using transient structural analysis.

scholarly journals Thermal distribution analysis of inner defects in TSV

2018 ◽  
Vol 38 ◽  
pp. 04026
Author(s):  
Chuan Kai Jiang ◽  
Lei Nie ◽  
Wen Jia ◽  
Yu Ning Zhong
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Distribution ◽  
Temperature Variation ◽  
Finite Element Models ◽  
Distribution Analysis ◽  
Internal Defects ◽  
External Temperature ◽  
Thermal Distribution ◽  
Distinct Temperature

In order to uncover the external manifestations of TSV internal defects, the finite element models of typical internal defects, which were filling missing, axial cavity and end cavity, were established. The thermal analysis was carried out using thermoelectric coupling method. The temperature distribution of TSV with and without defects were obtained. And the temperature variation profiles on the defined paths of TSV layer were also analyzed. The analysis indicated that all the defective TSV showed distinct temperature distribution with the defect-free TSV. Among three typical defects, TSV with filling missing showed the most obvious difference on the temperature distribution and path variation. TSV with end cavity has relatively weak affect and the slightest defect was TSV with axial cavity. Therefore, it could be seen that the external temperature difference caused by the internal defects of TSV could provide effective information for the identification and detection in TSV with internal defects.

scholarly journals NUMERICAL SIMULATION ON JOINING OF CERAMICS WITH METAL BY FRICTION WELDING TECHNIQUE

2013 ◽  
Vol 22 ◽  
pp. 190-195 ◽  
Author(s):  
N. RAJESH JESUDOSS HYNES ◽  
P. NAGARAJ ◽  
S. JOSHUA BASIL
Keyword(s):  
Numerical Simulation ◽  
Thermal Analysis ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Distribution ◽  
Friction Welding ◽  
Transient Liquid Phase ◽  
Sheet Thickness ◽  
Welding Process ◽  
Element Analysis

The joining of ceramic and metals can be done by different techniques such as ultrasonic joining, brazing, transient liquid phase diffusion bonding, and friction welding. Friction Welding is a solid state joining process that generates heat through mechanical friction between a moving workpiece and a stationary component. In this article, numerical simulation on thermal analysis of friction welded ceramic/metal joint has been carried out by using Finite Element Analysis (FEA) software. The finite element analysis helps in better understanding of the friction welding process of joining ceramics with metals and it is important to calculate temperature and stress fields during the welding process. Based on the obtained temperature distribution the graphs were plotted between the lengths of the joint corresponding to the temperatures. To increase the wettability, aluminium sheet was used as an interlayer. Hence, numerical simulation of friction welding process is done by varying the interlayer sheet thickness. Transient thermal analysis had been carried out for each cases and temperature distribution was studied. From the simulation studies, it is found that the increase in interlayer thickness reduces the heat affected zone and eventually improves the joint efficiency of alumina/aluminum alloy joints.

scholarly journals Thermal performance analysis and optimization design of dry type air core reactor with the double rain cover

2021 ◽  
pp. 67-67
Author(s):  
FaTing Yuan ◽  
Shouwei Yang ◽  
Shihong Qin ◽  
Kai Lv ◽  
Bo Tang ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Temperature Rise ◽  
Optimization Design ◽  
Orthogonal Experiment ◽  
Structural Parameters ◽  
Fluid Velocity ◽  
Optimization Method ◽  
Design Parameters ◽  
Air Core

In this paper, a fluid-thermal coupled finite element model is established according to the design parameters of dry type air core reactor. The detailed temperature distribution can be achieved, the maximum error coefficient of temperature rise is only 6% compared with the test results of prototype, and the accuracy of finite element calculate method is verified. Taking the equal height and heat flux design parameters of reactor as research object, the natural convection cooling performance of reactor with and without the rain cover is investigated. It can be found that the temperature rise of reactor is significantly increased when adding the rain cover, and the reasons are given by analyzing the fluid velocity distribution of air dcuts between the encapsulation coils. In order to reduce the temperature rise of the reactor with the rain cover, the optimization method based on the orthogonal experiment design and finite element method is proposed. The six factors of the double rain cover are given, which mainly affect the temperature rise of reactor, and the five levels are selected, the influence curve and contribution rate of each factor on the temperature rise of reactor are analyzed. The results show that the contribution ratio of the parameter H1, L1 and L2, are obviously higher than the parameter H2, L3 and ?, so the more attention should be paid in the design of double rain cover. Meanwhile, the optimal structural parameters of rain cover are given based on the influence curves, and the temperature rise is only 43.25?C. The results show that the optimization method can reduce the temperature rise of reactor significantly. In addition, the temperature distribution of inner encapsulations coils of reactor are basically the same, the current carrying capacity of coils can be fully utilized, which provides an important guidance for the optimization design of reactor.

Residual Stresses and Deformations in Electron Beam Melting process Using Finite Element Analysis

2012 ◽  
Vol 576 ◽  
pp. 789-792 ◽  
Author(s):  
Afshin Mohammad Hosseini ◽  
Syed H. Masood ◽  
Darren Fraser ◽  
Mahnaz Jahedi
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Electron Beam ◽  
Structural Analysis ◽  
Residual Stresses ◽  
Electron Beam Melting ◽  
Process Conditions ◽  
Measured Temperature ◽  
Transient Thermal Analysis ◽  
Transient Thermal

The simulation of residual stress in Electron Beam Melting (EBM) process is critical for optimization of process conditions. However, there is no published literature on the simulation of residual stresses in this process. This paper considers finite element modeling of the temperature distribution through transient thermal analysis. The measured temperature and total heat flux from transient thermal analysis are then used as initial input parameters to the structural analysis. Consequently, deformations and residual stresses in structural analysis were measured. The titanium alloy, Ti6Al4V has been used, which is one of the most common materials for biomedical implants due to its high strength to weight ratio, corrosion resistance, and its biocompatibility features.

Thermal Stresses at Dissimilar Pipe-Stanchion Interfaces

2004 ◽  
Author(s):  
Chakrapani Basavaraju
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Steady State ◽  
High Temperature ◽  
Carbon Steel ◽  
Alloy Steel ◽  
Thermal Stresses ◽  
Steel Alloy ◽  
High Temperature Steam

High temperature steam lines in power plant piping systems are often supported by the use of pipe support stanchions welded to the steam pipe. The end of the pipe stanchion has a steel plate welded to it, which typically slides on rack steel. The temperature of the stanchion drops from the process pipe interface along the length of the stanchion. The material for the process pipe carrying high temperature steam can be stainless steel, alloy steel, or carbon steel. The material for the stanchion can also be stainless steel, alloy steel, or carbon steel. It is of course cheaper to use carbon or low alloy steel for the stanchion as there is no steam flow in to the stanchion, when the process pipe is made of stainless steel, or other high alloy steel such A335 Gr. P91. In this paper, finite element thermal analysis is utilized first to obtain steady state temperature distribution due to decay or attenuation from the steam line surface along the stanchion. Conduction of heat from process pipe to stanchion, and convection from stanchion surface are considered. Then finite element structural analysis was performed to obtain steady state thermal stresses at the pipe-stanchion interface utilizing the temperature distribution obtained from thermal analysis as an input. The current industrial practice is to use similar materials for both process pipe and stanchion materials conservatively. Normally encountered pipe materials were considered. The materials studied include 304 & 316 Grade stainless steels, A335 Grades P91, P22, & P11 alloy steels, and A106 Grade B carbon steel. The temperature and stress results are presented. Guidelines are provided for the acceptability of pipe-stanchion dissimilar interfaces.

scholarly journals Structural and Thermal Analysis of Brake Drum

2020 ◽  
Vol 6 (12) ◽  
pp. 8-15
Author(s):  
Shaik Chand Mabhu Subhani A.Pavan Kumar and Dr.D Venkata Rao
Keyword(s):  
Thermal Analysis ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Cast Iron ◽  
Thermal Stresses ◽  
Carbon Composite ◽  
Brake Disc ◽  
Element Analysis ◽  
Drum Brake ◽  
Brake Drum

The brake drum is a specialized brake that uses the concept of friction to decelerate or to stop the vehicle. The deceleration is achieved by the assistance of the friction generated by a set of brake shoes or pads. During the brake operation heat is ejected out this causes damage to the brake. Disc (Rotor) brakes are exposed to large thermal stresses during routine braking and extraordinary thermal stresses during hard braking. To satisfy this condition the drum material should possess a high thermal conductivity, thermal capacity and high strength .The common material used for construction of brake drum is cast iron. The aim of the project is to design, model a disc. Modeling is done using catia. Structural and Thermal analysis is to be done on the drum brakes using four materials Stainless Steel, gray Cast iron, carbon carbon composite & aluminum metal matrix. The shoes of this kind of brake are contained within the drum and expand outwards when the brake is applied. Such kind of brakes is used in medium heavy-duty vehicles. Structural analysis is done on the drum brake to validate the strength of the drum brake and thermal analysis is done to analyze the thermal properties. Comparison can be done for deformation; stresses, temperature etc. form the three materials to check which material is best. Catia is a 3d modeling software widely used in the design process. ANSYS is general-purpose finite element analysis (FEA) software package. Finite Element Analysis is a numerical method of deconstructing a complex system into very small pieces (of user-designated size) called elements.

Finite Element Analysis of The Thermal Behaviour of Different Types of Connecting Rod for Various Materials

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
D. Sheiksha Vali ◽  
T. Micha Premkumar ◽  
A. Anand Sai ◽  
P.V. Sudarshan ◽  
P. Roopak ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Heat Flux ◽  
Finite Element ◽  
Temperature Distribution ◽  
High Performance ◽  
Connecting Rod ◽  
Element Analysis ◽  
Different Types ◽  
Element Method

Thermal analysis of different types of the connecting rods are under stead state condition using finite element method. The energy equation and heat transfer equation in the solids are completely addressed and solved using the Newton-Raphson technique and finite element method. SOLID WORKS is used for modelling different types of connecting rods and ANSYS© software is used to perform this numerical investigation. Three different materials like structural steel, aluminium alloy and titanium are selected as the material of connecting rod to do the comparative studies. In a steady thermal analysis, properties like temperature distribution, total heat flux and directional heat flux are calculated. The knowledge of the above properties is required to identify the viscosity of oil used for lubrication and also temperature distribution is helpful to find the thermal deformation in the connecting rod. Temperature and convection co-efficient are the boundary conditions. 22°C is the initial temperature value and the value of convection co-efficient is 350W/m2°C. As a result of thermal analysis, titanium alloy is the best material among the three materials as it with stand higher temperatures, high lifecycle and high performance.

Inverse Thermal Analysis of a Coke Drum Using a Bayesian Probabilistic Approach

2015 ◽  
Author(s):  
Edrissa Gassama ◽  
Charles Panzarella ◽  
Jeffrey Cochran
Keyword(s):  
Heat Flux ◽  
Finite Element ◽  
Temperature Distribution ◽  
Flux Distribution ◽  
Thermal Stresses ◽  
Heat Conduction Problem ◽  
Probabilistic Approach ◽  
Operating Conditions ◽  
Heat Flux Distribution ◽  
Posterior Probability Distribution

There is much interest in predicting the optimal operating conditions of a coke drum in order to extend its life and optimize both maintenance and repair. Typically, only temperature measurements on the outer surface of the wall are available from monitoring. In order to predict damage due to thermal stresses and other mechanisms, the temperature distribution through the wall is required. This could be determined if the heat flux on the inner surface of the wall were known, but this is difficult to obtain directly. In this paper, the heat flux distribution on the inner wall is determined solely from thermocouple measurements taken on the outside of the wall by solving a stochastic inverse heat conduction problem (IHCP). A finite element analysis is used to solve the forward thermal problem, and a Bayesian inference approach is used to model the posterior probability distribution of the heat flux. A newly developed probabilistic sampling technique known as the Particle Raking Algorithm (PRA) is found to be quite effective at solving this inverse problem. Once determined, the heat flux distribution is then applied as a boundary condition for the finite element model to determine the through-wall temperature distribution.

Three-Dimensional Thermal Analysis of Spherical Plain Bearings with Self-Lubricating Fabric Liner

2010 ◽  
Vol 97-101 ◽  
pp. 3366-3370 ◽  
Author(s):  
Lei Cao ◽  
Xue Jin Shen ◽  
Ru Yan Li
Keyword(s):  
Thermal Analysis ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Steady State ◽  
Contact Pressure ◽  
Structural Model ◽  
Von Mises Stress ◽  
Effect Of Temperature ◽  
Element Analysis ◽  
Steady State Temperature

Finite element analysis and corresponding experimental comparisons of temperature were performed to investigate the thermal behaviour of spherical plain bearings with self-lubricating fabric liner. Based on the theory of heat transfer, tribology and composite material mechanics, a sequentially coupled, 3D, thermo-mechanical finite element analysis model of the bearing system was built up, in which the steady-state temperature distribution from the thermal analysis was applied as a body load to the structural model. As a result, the maximum steady-state temperature of 78.1°C, von Mises stress of 299MPa, displacement of 0.0806mm along Z axis of the bearing are presented, together with the maximum contact pressure of 324MPa which are significant in the structural design and optimization of these bearings. The effect of temperature rise on the contact pressure distribution is discussed. The agreement of the temperature computation results with the experimental data indicates that this method could be used to analyze virtually any such bearing.

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