On the influence of thermal boundary conditions on the Thermo Mechanical Analysis of turbine housing of a turbocharger

Oberste-Brandenburg, C.; Shoghi, K.; Gugau, Marc; Kruse, Felix

doi:10.1533/9780857096135.2b.83

Cited by 6 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermomechanical temperature and strain (stress) simulations are solved by uncoupled or coupled methods; the uncoupled method requires manual control of iteration errors and the assessment of convergence results; it only focuses on the relationship between the core physical quantities in the physical field 2,8,11 The coupling solution can set the iteration error and automatically obtain the convergence result; we focus on the relationship between multiple or all physical quantities in the physical field. [12][13][14] The temperature field measurement of the turbocharger components requires a thermocouple to acquire the temperature at a point on the measured object. 5,15 This method is the commonly employed validation method in engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

Chen

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The fatigue life of turbine housing is an important index to measure the reliability of a radial turbocharger. The increase in turbine inlet temperatures in the last few years has resulted in a decrease in the fatigue life of turbine housing. A simulation method and experimental verification are required to predict the life of a turbine housing in the early design and development process precisely. The temperature field distribution of the turbine housing is calculated using the steady-state bidirectional coupled conjugate heat transfer method. Next, the temperature field results are considered as the boundary for calculating the turbine housing temperature and thermomechanical strain, and then, the thermomechanical strain of the turbine housing is determined. Infrared and digital image correlations are used to measure the turbine housing surface temperature and total thermomechanical strain. Compared to the numerical solution, the maximum temperature RMS (Root Mean Square) error of the monitoring point in the monitoring area is only 3.5%; the maximum strain RMS error reached 11%. Experimental results of temperature field test and strain measurement test show that the testing temperature and total strain results are approximately equal to the solution of the numerical simulation. Based on the comparison between the numerical calculation and experimental results, the numerical simulation and test results were found to be in good agreement. The experimental and simulation results of this method can be used as the temperature and strain (stress) boundaries for subsequent thermomechanical fatigue (TMF) simulation analysis of the turbine housing.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

Chen

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…The semi-empirical approach utilizes empirical correlations to describe the thermal boundary conditions applied to the model. Other thermo-structural investigations of turbine housing are presented by Oberste-Brandenburg et al [4] and Guo et al [5].…”

Section: Introductionmentioning

confidence: 99%

Uncoupled CFD-FEA Methods for the Thermo-Structural Analysis of Turbochargers

Luczynski¹,

Giesen²,

Gier³

et al. 2019

IJTPP

View full text Add to dashboard Cite

In turbocharger design, the accurate determination of thermally induced stresses is of particular importance for life cycle predictions. An accurate, transient, thermal finite element analysis (FEA) of turbocharger components requires transient conjugate heat transfer (CHT) analysis. However, due to the vastly different timescales of the heat transfer mechanisms in fluid and in solid states, unsteady CHT simulations are burdened by high computational costs. Hence, for design iterations, uncoupled CFD and FEA approaches are needed. The quality of the uncoupled thermal analysis depends on the local heat transfer coefficients (HTC) and reference fluid temperatures. In this paper, multiple CFD-FEA methods known from literature are implemented in a numerical model of a turbocharger. In order to describe the heat transfer and thermal boundary layer of the fluid, different definitions of heat transfer coefficients and reference fluid temperatures are investigated with regard to calculation time and accuracy. For the transient simulation of a long heating process, the combination of the CFD-FEA methods with the interpolation FEA approach is examined. Additionally, a structural-mechanical analysis is conducted. The results of the developed methods are evaluated against experimental data and the results of the extensive unsteady CHT numerical method.

show abstract

Thermomechanical Analysis of Transient Temperatures in a Radial Turbine Wheel

Diefenthal

Luczynski

Rakut

et al. 2017

Journal of Turbomachinery

View full text Add to dashboard Cite

In turbomachinery design, the accurate prediction of the life cycle is one of the most challenging issues. Traditionally, life cycle calculations for radial turbine wheels of turbochargers focus on mechanical loads such as centrifugal and vibration forces. Due to the increase of exhaust gas temperatures in the last years, thermomechanical fatigue in the turbine wheel came more into focus. In order to account for the thermally induced stresses in the turbine wheel as a part of the standard design process, a fast method is required for predicting metal temperatures. In order to develop a suitable method, the mechanisms that cause the thermal stresses have to be understood. Thus, in a first step, a detailed analysis of the temperature fields is conducted in the present paper. Extensive numerical simulations of a thermal shock process are carried out and validated by experimental data from a test rig. Based on the results, the main heat transfer mechanisms are identified, which are crucial for the critical thermal stresses in transient operation. It is shown that these critical stresses mainly depend on local 3D flow structures. With this understanding, two fast methods to calculate the transient temperatures in a radial turbine were developed. The first method is based on a standard method for transient fluid/solid heat transfer. In this standard method, heat transfer coefficients are derived from steady-state computational fluid dynamics (CFD)/conjugate heat transfer (CHT) calculations and are linearly interpolated over the duration of the transient heating or cooling process. In the new method, this interpolation procedure was modified to achieve an exponential behavior of the heat transfer coefficients over the transient process in order to enable a sufficient accuracy. Additionally, a second method was developed. In this method, the specific heat capacity of the solid state is reduced by a “speed up factor” to shorten the duration of the transient heating or cooling process. With the shortened processes, the computing times can be reduced significantly. After the calculations, the resulting times are transferred into realistic heating or cooling times by multiplying them with the speed up factor. The results of both methods are evaluated against experimental data and against the results of a numerical method known from literature. The methods show a good agreement with those data.

show abstract

On the influence of thermal boundary conditions on the Thermo Mechanical Analysis of turbine housing of a turbocharger

Cited by 6 publications

References 3 publications

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

Uncoupled CFD-FEA Methods for the Thermo-Structural Analysis of Turbochargers

Thermomechanical Analysis of Transient Temperatures in a Radial Turbine Wheel

Contact Info

Product

Resources

About