Approach to Unidirectional Coupled CFD – FEM Analysis of Axial Turbocharger Turbine Blades

Filsinger, Dietmar; Szwedowicz, J.; Schäfer, O.

doi:10.1115/2001-gt-0288

Cited by 3 publications

(1 citation statement)

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“…Drewczynski and Rzadkowski 12 use methods of load transfer that affect rotor blade stress and displacement levels during one period of rotation. Filsinger et al 13 study the vibration behaviour of an axial turbocharger turbine using an approach to unidirectional coupled computational fluid dynamic–finite element method (CFD-FEM) analysis. Other three-dimensional (3D) modelling studies of heat transfer in turbochargers have been carried out by changing the materials of the turbine blade and assuming car is running at higher speeds.…”

Section: Introductionmentioning

confidence: 99%

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

Gil

Tiseira

García-Cuevas

et al. 2018

International Journal of Engine Research

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Each of the elements that make up the turbocharger has been gradually improved. In order to ensure that the system does not experience any mechanical failures or loss of efficiency, it is important to study which engine-operating conditions could produce the highest failing rate. Common failing conditions in turbochargers are mostly achieved due to oil contamination and high temperatures in the bearing system. Thermal management becomes increasingly important for the required engine performance. Therefore, it has become necessary to have accurate temperature and heat transfer models. Most thermal design and analysis codes need data for validation; often the data available fall outside the range of conditions the engine experiences in reality leading to the need to interpolate and extrapolate disproportionately. This article presents a fast three-dimensional heat transfer model for computing internal temperatures in the central housing for non-water cooled turbochargers and its direct validation with experimental data at different engine-operating conditions of speed and load. The presented model allows a detailed study of the temperature rise of the central housing, lubrication channels, and maximum level of temperature at different points of the bearing system of an automotive turbocharger. It will let to evaluate thermal damage done to the system itself and influences on the working fluid temperatures, which leads to oil coke formation that can affect the performance of the engine. Thermal heat transfer properties obtained from this model can be used to feed and improve a radial lumped model of heat transfer that predicts only local internal temperatures. Model validation is illustrated, and finally, the main results are discussed.

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Section: Introductionmentioning

confidence: 99%

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

Gil

Tiseira

García-Cuevas

et al. 2018

International Journal of Engine Research

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Blade Excitation in Pulse-Charged Mixed-Flow Turbocharger Turbines

Senn

Seiler

Schaefer

2010

Journal of Turbomachinery

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In this article, a fully three-dimensional computational modeling approach in the time and frequency domain is presented, which allows to accurately predicting fluid-structure interactions in pulse-charged mixed-flow turbocharger turbines. As part of the approach, a transient computational fluid mechanics analysis is performed based on the compressible inviscid Euler equations covering an entire engine cycle. The resulting harmonic orders of aerodynamic excitation are imposed in a forced response analysis of the respective eigenvector to determine effective stress amplitudes. The modeling approach is validated with experimental results based on various mixed-flow turbine designs. It is shown that the numerical results accurately predict the measured stress levels. The numerical approach can be used in the turbine design and optimization process. Aerodynamic excitation forces are the main reason for high cycle fatigue in turbocharger turbines and therefore a fundamental understanding is of key importance.

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A Survey of Aero-Engine Blade Modeling and Dynamic Characteristics Analyses

Zhang,

Wang,

Liu

et al. 2024

Aerospace

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The rotating blade is a key component of an aero-engine, and its vibration characteristics have an important impact on the performance of the engine and are vital for condition monitoring. This paper reviews the research progress of blade dynamics, including three main aspects: modeling of blades, solution methods, and vibration characteristics. Firstly, three popular structural dynamics models for blades are reviewed, namely lumped-mass model, finite element model, and semi-analytical model. Then, the solution methods for the blade dynamics are comprehensively described. The advantages and limitations of these methods are summarized. In the third part, this review summarizes the properties of the modal and vibration responses of aero-engine blades and discusses the typical forms and mechanisms of blade vibration. Finally, the deficiencies and limitations in the current research on blade modeling and vibration analysis are summarized, and the directions for future efforts are pointed out. The purpose of this review is to provide meaningful insights to researchers and engineers in the field of aero-engine blade modeling and dynamic characteristics analysis.

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Approach to Unidirectional Coupled CFD – FEM Analysis of Axial Turbocharger Turbine Blades

Cited by 3 publications

References 0 publications

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers

Blade Excitation in Pulse-Charged Mixed-Flow Turbocharger Turbines

A Survey of Aero-Engine Blade Modeling and Dynamic Characteristics Analyses

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