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Bücher Wissen & Bildung Englische Bücher Naturwissenschaft, Medizin, Informatik, Technik Physik & Astronomie Thermodynamik Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines
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Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines
Andreas Manz (Taschenbuch, Englisch)
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Beschreibung
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. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
18.08.2016
Sprache
Englisch
EAN
9783832542818
Herausgeber
Logos Berlin
Sonderedition
Nein
Autor
Andreas Manz
Seitenanzahl
261
Einbandart
Taschenbuch
Schlagwörter
Engine Knock, Downsizing, G-Equation, Reaction Kinetics, Autoignition
Thema-Inhalt
TGBN - Motoren und Antriebstechnik
PHH - Thermodynamik und Wärme
PNRW - Thermochemie und chemische Thermodynamik
TBC - Ingenieurswesen, Maschinenbau allgemein
TDCX - Verfahrenstechnik und -technologie
TGB - Maschinenbau
TGMB - Technische Thermodynamik
UYM - Computermodellierung und -simulation
Höhe
210 mm
Breite
14.5 cm
Hersteller: Logos Verlag Berlin GmbH, Georg-Knorr-Str. 4, Geb. 10, Berlin, Deutschland, 12681, redaktion@logos-verlag.de
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