The Development of Turbine Volute Surface Temperature Models for 3D CFD Vehicle Thermal Management Simulations: Part 3: Exhaust Radial Turbine Volute Systems

Vos, Steve De; Haehndel, Kristian; Frank, Torsten; Christel, Frieder; Abanteriba, Sylvester

doi:10.4271/2014-01-0648

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The results showed good resolution of the local thermal gradients on the surface of the acoustic silencers [18]. The methodology was advanced further by DeVos via the development of a process to calculate the heat rate augmentation within the turbocharger system [34]. This was done using Dean and Nusselt correlations for vortices in centripetal flow domains.…”

Section: State Of the Artmentioning

confidence: 99%

Hybrid model for exhaust systems in vehicle thermal management simulations

Ahmed

Rottengruber

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2022

Automot. Engine Technol.

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Using Vehicle Thermal Management (VTM) simulations to predict the thermal load experienced by components is a popular method within the automotive industry. The VTM simulation approach is fast becoming equivalent to conducting thermal load tests with prototypes for vehicles powered by internal combustion engines. This is especially true in the early development phase of the vehicle. The accuracy of the VTM simulations plays a pivotal role at them being accepted as an eventual replacement for physical testing. The correct prediction of thermal loads in VTM simulations depends on a multitude of different parameters, but the modelling of the exhaust system plays a central role in it. This is because the exhaust gas, and with it the exhaust system, is the primary source of heat in a vehicle powered by an internal combustion engine. The developed approach not only needs to be accurate but also modular enough to allow for different exhaust configurations to be tested. It also needs to be capable of integration into any VTM simulation workflow while maintaining an industrially acceptable turnaround time. This paper explores a new methodology to achieve these requirements. A 1D/3D hybrid approach to exhaust system modelling is presented. In this, the components that have an enthalpy change of the exhaust gas, such as the turbocharger, have been modelled as 1D and simple components such as pipes have been modelled in 3D. This has the advantage of combining the speed of 1D simulations with the spatial accuracy of 3D simulations. The method uses a unique three-code co-simulation technique for full vehicle VTM simulations. The coupling is between a 3D CFD software, a 1D simulation tool, and a Finite Element based thermal solver. The methodology was validated against experimental data for multiple loadcases. The results show good agreement with experiment within acceptable tolerances.

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Section: State Of the Artmentioning

confidence: 99%

Hybrid model for exhaust systems in vehicle thermal management simulations

Ahmed

Rottengruber

Full

2022

Automot. Engine Technol.

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“…Simulation and analysis of fluid flow and heat transfer can be found in literature. De Vos et al addresses the fluid flow phenomena present in the turbine housing using augmented Nusselt correlations to represent the heat transfer coefficients of the internal volute surface [89]. The results show a good prediction of the surface temperature under two measured operating conditions.…”

Section: Turbocharger Heat Transfer Modelsmentioning

confidence: 99%

Experimental study of oil coking problem and contribution to the modelling of heat transfer in turbochargers

Usaquén¹,

Tatiana²

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The automotive industry represents one of the most important sectors in the world. Given its socio-economic influence, research is aimed at reducing fuel consumption and emissions. Turbochargers provide several benefits including increased power for a given engine size, improved fuel economy and reduced emissions. The turbocharger is an important piece for the new generation of engines that must comply with the Euro 6 or in the U.S. Tier 3 vehicle emissions and fuel standard program. As more effort is made to increase efficiencies and reduce emissions, the complexity of the system increases. The high rotational speeds, pulsating flow conditions and high temperature differences between working fluids (exhaust gases, compressed air, lubricating oil, coolant fluids) make the turbo-charging a challenging task. Numerical simulation opens a range of possibilities to study the performance, efficiency and design of components in the turbocharger, but requires continued accuracy refinements. In this thesis, a great effort has been made to improve the overall understanding of the different physical phenomena that occur inside the turbocharger. Both, experimental and modelling efforts have been made to understand the thermal behaviour of the turbocharger under engine start/stop conditions. After state-of-the-art review of thermal studies and heat transfer simulation codes, this work presents an extensive experimental testing campaign that includes a thermal characterization of the turbocharger in stationary and transient conditions. Subsequently, several turbochargers were measured to assess the consequences that degraded oils can generate in the bearing system during endurance tests of oilcoking.To minimize the possibilities of coke formation, some theoretical studies were done. First, a 1D turbocharger model was used in GT-Power TM for a detailed study of the temperature rise in the central housing during an engine hot-stop. The simulated cooling strategies aims to find an optimal in terms of minimizing extra energy consumption per K housing temperature reduction. After, a 2D radial model is proposed as improvement of an existing one-dimensional model developed at CMT -Universitat Politècnica de València. Aiming for a low computational cost, the radial model was developed to be compatible with fast one-dimensional engine simulations. Later, a detailed solution of heat fluxes was made by means of CFD using a 3D design of the turbocharger's central housing. The 3D model improved the results when temperature of the bearings/shaft is required. Additionally, thermal properties within the turbocharger can be obtained and therefore a reduction of the experimental tasks in the thermo-hydraulic test bench. Both 2D and 3D models were validated using experimental data, demonstrating predictive accuracy improvements on the results of previous models.i Resumen La industria automotriz representa uno de los sectores más importantes del mundo. Dada su influencia socioeconómica, la investigación está destinada a reducir el consumo de comb...

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