A New Generation of Tools for Accurate Thermo-Mechanical Finite Element Analyses of Engine Components

Lowe, Antony S. H.; Morel, Thomas

doi:10.4271/920681

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…These experiments revealed that temperature and heat transfer are not uniform throughout the combustion chamber, and the manner in which in-cylinder conditions influence the temperature distribution is not uniform either. Over time, this was confirmed by CFD simulations as well [46]. Some examples are given in Figs.…”

Section: Previous Researchsupporting

confidence: 61%

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A contribution to the global modeling of heat transfer processes in Diesel engines

Iborra¹

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Current challenges in research and development of powertrains demand new computational tools capable of simulating vehicle operation under very diverse conditions. This is due, among other reasons, to new homologation standards in the automotive sector requiring compliance of exhaust emissions regulations under any possible driving condition on the road. Global engine or vehicle models provide many advantages to engineers because they allow to reproduce the entire system under study, considering the physical processes that take place in different components and the interactions among them. This thesis aims to enable the modeling of heat transfer processes in a complete engine simulation tool developed at CMT-Motores Térmicos research institute. This 0D/1D simulation tool is called Virtual Engine Model (VEMOD).The development of heat transfer models comprises the engine block and the ancillary systems. The model of heat transfer in the engine block deals with the central problem of in-cylinder convection by means of a combination of experimental research, CFD simulation and multizone 0D modeling. The other thermal processes present in the engine block are examined in order to implement suitable submodels. Once the model is complete, it undergoes a validation with experimental transient tests. Afterwards, the ancillary systems for engine thermal management are brought into focus. These systems are considered by means of two new models: a model of heat exchangers and a model of thermo-hydraulic circuits. The development of those models is reported in detail.Lastly, with the referred thermal models integrated in the global simulation tool, a validation study is undertaken. The goal is to validate the ability of the Virtual Engine Model to capture the thermal response of a real engine under various operating conditions. To achieve that, an experimental campaign combining tests under steady-state operation, under transient operation and at different temperatures is conducted in parallel to the corresponding simulation campaign. The capacity of the global engine simulations to replicate the measured thermal evolution is finally demonstrated.As you set out for Ithaka hope the voyage is a long one, full of adventure, full of discovery. Cavafy AcknowledgmentsA PhD is a long voyage of discovery and personal growth. Far from being a solitary journey, there are many people who intervene to make possible that all efforts reach a good conclusion. Having reached this point, I wish to acknowledge all people and institutions that have contributed to this thesis by one means or another.First of all, I want to thank my PhD supervisor, Prof. Pablo Olmeda, for his teachings and support over these years. I'm also grateful to Dr. Antonio García for sharing with me his invaluable knowledge about research communication. Another important figure in this period has been Dr. Jaime Martín, from whom I have learned a lot by collaborating in research projects. Also thanks to Dr. Francisco Arnau, for his compromise in building the Virtual Engine...

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Section: Previous Researchsupporting

confidence: 61%

“…At the end of the highest computational demand, 3D numerical models simulate physical phenomena with great accuracy and resolution [46]. They are usually employed for component design [47] [48].…”

Section: Introductionmentioning

confidence: 99%

A contribution to the global modeling of heat transfer processes in Diesel engines

Iborra¹

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“…A comprehensive review of engine thermo-mechanical fatigue was provided by Ogarevic et al (2001). The simulation methodologies of thermo-mechanical fatigue life prediction were presented by Swanger et al (1986), Lowe and Morel (1992), Zhuang and Swansson (1998), and Ahdad and Soare (2002). A discussion of diesel engine cumulative fatigue damage was provided by Junior et al (2005).…”

Section: Thermo-mechanical Fatiguementioning

confidence: 99%

Durability and reliability in diesel engine system design

Xin¹

2013

Diesel Engine System Design

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“…Therefore the following models were applied. Simplified finite element (FE) model, which is based on papers [13,20], is used to calculate combustion chamber temperatures while Woschni formula (c.f. [38]) was applied to estimate the heat transfer coefficient between the in -cylinder gas and the walls (boundary condition for FE model).…”

Section: Engine Modelmentioning

confidence: 99%

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

Vítek¹,

Máček²,

Klima³

et al. 2017

Journal of Middle European Construction and Design of Cars

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The proposed paper deals with an optimization of a highly-turbocharged large-bore gas SI engine. Only steady state operation (constant engine speed and load) is considered. The paper is mainly focused on theoretical potential of 2-stage turbocharging concept in terms of performance and limitation. The results are obtained by means of simulation using complex 0-D/ 1-D engine model including the control algorithm. Different mixture composition concepts are considered to satisfy different levels of NOx limit - fresh air mixed with external cooled EGR is supposed to be the right approach while optimal EGR level is to be found. Considering EGR circuit, 5 different layouts are tested to select the best design. As the engine control is relatively complex (2-sage turbocharger group, external EGR, compressor blow-by, controlled air excess), 5 different control means of boost pressure were considered. Each variant based on above mentioned options is optimized in terms of compressor/turbine size (swallowing capacity) to obtain the best possible BSFC. The optimal variants are compared and general conclusions are drawn.

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A New Generation of Tools for Accurate Thermo-Mechanical Finite Element Analyses of Engine Components

Cited by 15 publications

References 21 publications

A contribution to the global modeling of heat transfer processes in Diesel engines

A contribution to the global modeling of heat transfer processes in Diesel engines

Durability and reliability in diesel engine system design

Optimization of 2‑Stage Turbocharged Gas SI Engine Under Steady State Operation

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