A New Approach to Integrating Engine Performance and Component Design Analysis Through Simulation

Morel, Thomas; Keribar, Rifat; Blumberg, Paul N.

doi:10.4271/880131

Cited by 31 publications

(4 citation statements)

References 38 publications

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“…Such a structure of the model and the resulting computer simulation algorithm binds the solution procedure to the thermodynamic cycle, thereby making it difficult to modify or replace submodels because these are deeply embedded in the simulator. The need to explore different concepts of an enginebased powerplant system has encouraged the development of structured systems simulation programs such as SPICE [7], IRIS [8] and that by Hong [9], which express the conservation equations in a general form and where the solution procedure is independent of the individual processes in the engine cycle. Such methods allow easy modifications and replacement of submodels as these are not coupled to a particular form of the conservation equation during the different phases of the cycle.…”

Section: Solution Methodologymentioning

confidence: 99%

“…To aid this development effort, Morel and Keribar [38] developed a computer simulation that allows a detailed transient simulation of the engine warm-up period from initial ambient conditions to a fully warmed-up state. The simulation combines the engine systems model IRIS [8] (to model the thermal processes in gases) with a finite element model of the engine structure (to represent the structure in detail). Such a simulation can be used to quantify the effect of cold start on combustion, tribology, thermal shock and performance.…”

Section: Transient Performance Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic modelling of complete engine systems—a review

Chow

Wyszyński

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper gives an overview of engine systems modelling by first and second law analysis. Complex engine systems are becoming more commonly implemented to meet the increasing demands of fuel efficiency and emission legislation. Future engine systems may also include both exhaust gas treatment and fuel processing devices. This leads to complex interactions within the thermodynamics and chemistry of powerplant systems. There is therefore a need to improve the systems modelling methods. This concerns first of all the composition tracking and the models of three-way catalytic exhaust converters and fuel processors. The applicability of gas dynamics modelling to chemically complex systems is also discussed. All these processes need to be modelled as interacting parts of one system.

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Section: Solution Methodologymentioning

confidence: 99%

Section: Transient Performance Modelsmentioning

confidence: 99%

Thermodynamic modelling of complete engine systems—a review

Chow

Wyszyński

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…By incorporating one-dimensional (1D) gas dynamics for engine airflow paths with simple zero-dimensional (0D) thermodynamic models for combustion, engine concepts and controls can now be developed and evaluated virtually with relatively minimal computational cost. 23,24 These system-level simulation frameworks can also be used to generate the engine fuel consumption maps necessary for fuel economy drive-cycle simulations. 11 The reduced-order models for SI and HCCI combustion proposed throughout the years have proved to be a valuable resource for understanding the interactions between combustion modes and the underlying engine system, and subsequently optimizing the engine design and controls.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic efficiency assessment of gasoline spark ignition and compression ignition operating strategies using a new multi-mode combustion model for engine system simulations

Ortiz-Soto

Lavoie

Wooldridge

et al. 2018

International Journal of Engine Research

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Advanced combustion strategies for gasoline engines employing highly dilute and low-temperature combustion modes, such as homogeneous charge compression ignition and spark-assisted compression ignition, promise significant improvements in efficiency and emissions. This article presents a novel, reduced-order, physics-based model to capture advanced multi-mode combustion involving spark ignition, homogeneous charge compression ignition and spark-assisted compression ignition operating strategies. The purpose of such a model, which until now was unavailable, was to enhance existing capabilities of engine system simulations and facilitate large-scale parametric studies related to these advanced combustion modes. The model assumes two distinct thermodynamic zones divided by an infinitely thin flame interface, where turbulent flame propagation is captured using a new zero-dimensional formulation of the coherent flame model, and end-gas auto-ignition is simulated using a hybrid approach employing chemical kinetics and a semi-empirical burn rate model. The integrated model was calibrated using three distinct experimental data sets for spark ignition, homogeneous charge compression ignition and spark-assisted compression ignition combustion. The results demonstrated overall good trend-wise agreement with the experimental data, including the ability to replicate heat release characteristics related to flame propagation and auto-ignition during spark-assisted compression ignition combustion. The calibrated model was assessed using a large parametric study, where the predicted homogeneous charge compression ignition and spark-assisted compression ignition operating regions at naturally aspirated conditions were representative of those determined during engine testing. Practical advanced combustion strategies were assessed relative to idealized engine simulations, which showed that efficiency improvements up to 30% compared with conventional spark-ignition operation are possible. The study revealed that poor combustion efficiency and pumping work are the primary mechanisms for efficiency losses for the advanced combustion strategies evaluated.

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“…In order to avoid such overshoots at discontinuities, different approaches have been proposed in the literature. The first solutions reported were based on the inclusion in the momentum equation of an additional term, which was an equivalent friction force in the first implementation of the method [14] or, in more recent developments, a momentum diffusion term [15]. An alternative to this solution, suggested by common practice when the flow equations are solved with finite differences schemes, was proposed in [16], where a Flux Corrected Transport (FCT) methodology was used that provided satisfactory results through the combination of dissipation via damping together with the phoenical form of the anti-diffusion term.…”

Section: Introductionmentioning

confidence: 99%

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

Torregrosa

Broatch

Arnau

et al. 2017

International Journal of Mechanical Sciences

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A suitable tool for the design of intake and exhaust systems of internal combustion engines is provided by time-domain non-linear finite volume models. These models, however, are affected by overshoots at discontinuities and numerical dispersion unless some flux limiter is used. In this paper, the effect of the most relevant of such flux limiters on a nonlinear staggered-mesh finite-volume model is evaluated. Flux-Corrected-Transport (FCT) and Total Variation Diminishing (TVD) schemes, together with a Momentum Diffusion Term (MDT) are presented for such a model, and the performance of the resulting methods is checked in different problems representative of the influence of engine gas exchange flows on engine performance and intake and exhaust noise. First, two onedimensional cases are considered: the shock-tube problem, and the propagation of a finite amplitude pressure pulse. Secondly, a simple but representative three-dimensional geometry is studied. From the results obtained, it can be concluded that, even if none of the methods is able to handle properly the three problems considered, the FCT method provides the best overall performance.

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A New Approach to Integrating Engine Performance and Component Design Analysis Through Simulation

Cited by 31 publications

References 38 publications

Thermodynamic modelling of complete engine systems—a review

Thermodynamic modelling of complete engine systems—a review

Thermodynamic efficiency assessment of gasoline spark ignition and compression ignition operating strategies using a new multi-mode combustion model for engine system simulations

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

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