Multidimensional Modelling of Knocking Combustion in SI Engines PDF Download
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Author: Society of Automotive Engineers, Inc
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Society of Automotive Engineers, Inc
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Long Liang
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Book Description
Author: Andreas Manz
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832542817
Category : Science
Languages : en
Pages : 263
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Book Description
Downsizing of modern gasoline engines with direct injection is a key concept for achieving future CO22 emission targets. However, high power densities and optimum efficiency are limited by an uncontrolled autoignition of the unburned air-fuel mixture, the so-called spark knock phenomena. By a combination of three-dimensional Computational Fluid Dynamics (3D-CFD) and experiments incorporating optical diagnostics, this work presents an integral approach for predicting combustion and autoignition in Spark Ignition (SI) engines. The turbulent premixed combustion and flame front propagation in 3D-CFD is modeled with the G-equation combustion model, i.e. a laminar flamelet approach, in combination with the level set method. Autoignition in the unburned gas zone is modeled with the Shell model based on reduced chemical reactions using optimized reaction rate coefficients for different octane numbers (ON) as well as engine relevant pressures, temperatures and EGR rates. The basic functionality and sensitivities of improved sub-models, e.g. laminar flame speed, are proven in simplified test cases followed by adequate engine test cases. It is shown that the G-equation combustion model performs well even on unstructured grids with polyhedral cells and coarse grid resolution. The validation of the knock model with respect to temporal and spatial knock onset is done with fiber optical spark plug measurements and statistical evaluation of individual knocking cycles with a frequency based pressure analysis. The results show a good correlation with the Shell autoignition relevant species in the simulation. The combined model approach with G-equation and Shell autoignition in an active formulation enables a realistic representation of thin flame fronts and hence the thermodynamic conditions prior to knocking by taking into account the ignition chemistry in unburned gas, temperature fluctuations and self-acceleration effects due to pre-reactions. By the modeling approach and simulation methodology presented in this work the overall predictive capability for the virtual development of future knockproof SI engines is improved.
Author: Long Liang
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Book Description
Author: Li Fan
Publisher:
ISBN:
Category :
Languages : en
Pages : 214
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Book Description
Author: P. A. Lakshminarayanan
Publisher: Springer Nature
ISBN: 9819706297
Category :
Languages : en
Pages : 678
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Book Description
Author: H. Schäpertöns
Publisher:
ISBN:
Category : Spark ignition engines
Languages : en
Pages : 13
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Book Description
Author: Lino Guzzella
Publisher: Springer Science & Business Media
ISBN: 3642107753
Category : Technology & Engineering
Languages : en
Pages : 362
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Book Description
Internal combustion engines (ICE) still have potential for substantial improvements, particularly with regard to fuel efficiency and environmental compatibility. In order to fully exploit the remaining margins, increasingly sophisticated control systems have to be applied. This book offers an introduction to cost-effective model-based control-system design for ICE. The primary emphasis is put on the ICE and its auxiliary devices. Mathematical models for these processes are developed and solutions for selected feedforward and feedback control-problems are presented. The discussions concerning pollutant emissions and fuel economy of ICE in automotive applications constantly intensified since the first edition of this book was published. Concerns about the air quality, the limited resources of fossil fuels and the detrimental effects of greenhouse gases exceedingly spurred the interest of both the industry and academia in further improvements. The most important changes and additions included in this second edition are: restructured and slightly extended section on superchargers, short subsection on rotational oscillations and their treatment on engine test-benches, complete section on modeling, detection, and control of engine knock, improved physical and chemical model for the three-way catalytic converter, new methodology for the design of an air-to-fuel ratio controller, short introduction to thermodynamic engine-cycle calculation and corresponding control-oriented aspects.
Author: Angelo Onorati
Publisher: SAE International
ISBN: 0768099528
Category : Technology & Engineering
Languages : en
Pages : 552
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Book Description
1D and Multi-D Modeling Techniques for IC Engine Simulation provides a description of the most significant and recent achievements in the field of 1D engine simulation models and coupled 1D-3D modeling techniques, including 0D combustion models, quasi-3D methods and some 3D model applications.
Author: M.J. Pilling
Publisher: Elsevier
ISBN: 0080535658
Category : Science
Languages : en
Pages : 823
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Book Description
Combustion has played a central role in the development of our civilization which it maintains today as its predominant source of energy. The aim of this book is to provide an understanding of both fundamental and applied aspects of low-temperature combustion chemistry and autoignition. The topic is rooted in classical observational science and has grown, through an increasing understanding of the linkage of the phenomenology to coupled chemical reactions, to quite profound advances in the chemical kinetics of both complex and elementary reactions. The driving force has been both the intrinsic interest of an old and intriguing phenomenon and the centrality of its applications to our economic prosperity. The volume provides a coherent view of the subject while, at the same time, each chapter is self-contained.
