Thermal Analysis of Heavy Duty Engine Exhaust Manifold Using CFD

Eroglu, Sinan; Duman, Ipek; Ergenç, Alp; Yanarocak, Rıfat Kohen

doi:10.4271/2016-01-0648

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…2. Engine speed and load steps: sharp variations in load and engine speed were performed and they were kept constant for two minutes to identify the dynamics of equation (8). The steps levels were defined to reach all the operating conditions at the entire working map.…”

Section: Steady Testsmentioning

confidence: 99%

“…Unfortunately, instantaneous estimation of exhaust temperature is highly challenging and requires from models in order to compensate the slow time response of temperature sensors [7]. Moreover, three-dimensional non-homogeneity of the exhaust temperature [8], together with the existence of pulsating conditions at the exhaust manifold [9], complicate both the measurement and modelling of the temperature for control purposes. Current ECUs usually incorporate pre-calibrated look-up tables providing the exhaust gas temperature for the open loop control the engine.…”

Section: Introductionmentioning

confidence: 99%

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In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

Guardiola

Olmeda

Plá

et al. 2017

Applied Thermal Engineering

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Exhaust temperature is a valuable parameter for engine control. However, measurement conditions at the engine exhaust and the slow dynamic response of temperature sensors difficult the determination of the instantaneous exhaust temperature. The present paper proposes a methodology for estimating the exhaust temperature exclusively relying in-cylinder pressure signal, engine speed and exhaust lambda.The presented methodology can replace or actualize widespread look-up table models for correcting calibration offsets, due to ageing, sensor bias or disturbances associated with the engine operation. The method uses the existence of resonant modes in the in-cylinder pressure for inferring the trapped mass and the in-cylinder temperature. An isentropic expansion of the gasses through the valves is assumed for estimating the cylinder outlet temperature of the gases, and the gas temperature drop along the exhaust runner and manifold is modelled through a nodal thermal model. The method was compared with current models under steady and transient conditions in a four stroke CI engine. Variations of injection, EGR, intake pressure and rail pressure were performed under steady operation and the transient response of the method was validated under specific transient test and at the WLTP cycle. A time invariant first order model was used for comparing the estimated temperature with that provided by the experimental sensors.

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Section: Steady Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

Guardiola

Olmeda

Plá

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…Eroglu et al [12] presented a theoretical analysis that evaluated three distinct computeraided engineering (CAE) methodologies for simulating fluid flow and thermal distribution in the exhaust manifold of a heavy-duty diesel engine. The fluid flow pulsations in the engine exhaust manifold represented a significant level of complexity.…”

Section: Introductionmentioning

confidence: 99%

On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold

Nouhaila,

Hassane,

Scutaru

et al. 2024

Applied Sciences

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This study investigating the accuracy of turbulence model simulations of the exhaust manifold using computational fluid dynamics (CFD) carries significant implications. By modeling and analyzing the flow of emissions, we aim to identify areas of high stress and pressure, minimize the pressure drop, and maximize the flow of exhaust gases. This not only enhances engine performance, reduces emissions, and improves the durability of the manifold but also provides a unique opportunity to predict and analyze the flow and performance of the exhaust manifold, both quantitatively and qualitatively. This paper aims to provide a detailed comparison of five turbulence models that are commonly used in CFD to offer valuable insights into their accuracy and reliability in predicting the flow characteristics of exhaust gases. The results show that the k-kl-ω model showed the highest maximum velocity and the most comprehensive temperature range, efficiently capturing the transitional flow effects. The K-ω STD and SST transition models displayed significantly higher turbulent kinetic energy (TKE) values, indicating their enhanced effectiveness in modeling complex turbulent and transitional flows. Conversely, the Reynolds stress and RNG k-epsilon models displayed lower TKE values, suggesting more subdued turbulence predictions. Despite this, all models exhibited similar pressure drop trends, with a noticeable increase near the midpoint of the manifold. These quantitative findings provide valuable insights into the suitability of different turbulence models for optimizing exhaust manifold design.

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Hybrid model for exhaust systems in vehicle thermal management simulations

Ahmed

Rottengruber

Full

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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Thermal Analysis of Heavy Duty Engine Exhaust Manifold Using CFD

Cited by 8 publications

References 6 publications

In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

On the Accuracy of Turbulence Model Simulations of the Exhaust Manifold

Hybrid model for exhaust systems in vehicle thermal management simulations

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