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Fuel Property Effects on Knock Propensity and Thermal Efficiency in a Direct-Injection Spark-Ignition Engine

Journal Article · · Applied Energy
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Engine knock remains one of the major barriers to further improvement in thermal efficiency of Direct-Injection Spark-Ignition (DISI) engines. While Research Octane Number and Motor Octane Number are often used as standard rating methods for knock resistance of fuels, the impacts of other fuel properties on knock propensity in modern engines such as heat of vaporization (HoV) and laminar flame speed (LFS) require better understanding in order to co-optimize fuels and engine designs to achieve higher thermal efficiency and lower CO2 emission. In the present study, computational fluid dynamics (CFD) is used to model a boosted DISI engine with a focus on knock prediction and fuel property effects. A level-set G-equation model is employed to capture turbulent premixed combustion, and is coupled with a transported Livengood-Wu (L-W) integral approach to predict autoignition in the unburnt region. A criterion associated with the L-W integral is developed to accurately predict knock onset and knock-limited spark-advance. This model is then applied to a sensitivity analysis of HoV and LFS on knock tendency and thermal efficiency. The pressure-temperature trajectory framework is applied and extended to study the fuel effects on auto-ignition process in the engine. An existing efficiency-based merit function, which is derived from experiments for boosted SI engines, is evaluated and improved based on the current CFD results.

Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Bioenergy Technologies Office (BETO)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1854531
Journal Information:
Applied Energy, Journal Name: Applied Energy Vol. 281; ISSN 0306-2619
Country of Publication:
United States
Language:
English

References (49)

The Effect of Charge Cooling on the RON of Ethanol/Gasoline Blends journal April 2013
Development of a RANS-Based Knock Model to Infer the Knock Probability in a Research Spark-Ignition Engine journal February 2017
Pressure and temperature effects on fuels with varying octane sensitivity at high load in SI engines journal March 2017
Amplified Pressure Waves During Autoignition: Relevance to CAI Engines conference October 2002
An alternative approach to accommodate detailed ignition chemistry in combustion simulation journal February 2017
Laminar flamelet concepts in turbulent combustion journal January 1988
Engine Knock Prediction and Evaluation Based on Detonation Theory Using a Quasi-Dimensional Stochastic Reactor Model conference April 2017
Effects of Fuel Composition on EGR Dilution Tolerance in Spark Ignited Engines journal April 2016
Knocking combustion in spark-ignition engines journal July 2017
The Effect of Compression Ratio, Fuel Octane Rating, and Ethanol Content on Spark-Ignition Engine Efficiency journal July 2015
Three-dimensional computational fluid dynamics engine knock prediction and evaluation based on detailed chemistry and detonation theory journal August 2017
Prediction of Cyclic Variability and Knock-Limited Spark Advance in a Spark-Ignition Engine journal April 2019
The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines journal February 2017
Examining the role of flame topologies and in-cylinder flow fields on cyclic variability in spark-ignited engines using large-eddy simulation journal September 2017
Insights into engine autoignition: Combining engine thermodynamic trajectory and fuel ignition delay iso-contour journal February 2019
Multidimensional Numerical Simulations of Knocking Combustion in a Cooperative Fuel Research Engine journal May 2018
Coupled Fluid-Solid Simulation for the Prediction of Gas-Exposed Surface Temperature Distribution in a SI Engine conference April 2017
Influence of autoignition delay time characteristics of different fuels on pressure waves and knock in reciprocating engines journal December 2009
A reduced toluene reference fuel chemical kinetic mechanism for combustion and polycyclic-aromatic hydrocarbon predictions journal June 2015
Modeling Investigation of Auto-ignition and Engine Knock by HO 2 conference April 2014
Modeling Knock in Spark-Ignition Engines Using a G-equation Combustion Model Incorporating Detailed Chemical Kinetics conference April 2007
A temperature wall function formulation for variable-density turbulent flows with application to engine convective heat transfer modeling journal February 1997
Understanding chemistry-specific fuel differences at a constant RON in a boosted SI engine journal April 2018
A detailed chemical reaction mechanism for the oxidation of hydrocarbons and its application to the analysis of benzene formation in fuel-rich premixed laminar acetylene and propene flames journal January 2004
Investigation of Knock Limited Compression Ratio of Ethanol Gasoline Blends conference April 2010
Exploring the Relationship Between Octane Sensitivity and Heat-of-Vaporization journal April 2016
Modeling Ignition and Combustion in Spark-ignition Engines Using a Level Set Method conference March 2003
Coupled Eulerian Internal Nozzle Flow and Lagrangian Spray Simulations for GDI Systems conference April 2017
Modeling Investigation of Different Methods to Suppress Engine Knock on a Small Spark Ignition Engine journal June 2015
Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 2-Effective Octane Numbers journal January 2012
Effect of Ethanol on Part Load Thermal Efficiency and CO 2 Emissions of SI Engines journal April 2013
Fuel Anti-Knock Quality - Part I. Engine Studies conference September 2001
Assessment of RNG Turbulence Modeling and the Development of a Generalized RNG Closure Model conference April 2011
A RANS knock model to predict the statistical occurrence of engine knock journal April 2017
A predictive Livengood–Wu correlation for two-stage ignition journal July 2016
Laminar burning velocity of gasoline and the gasoline surrogate components iso-octane, n-heptane and toluene journal October 2013
A laminar burning velocity and flame thickness correlation for ethanol–air mixtures valid at spark-ignition engine conditions journal December 2012
Effects of Fuel Laminar Flame Speed Compared to Engine Tumble Ratio, Ignition Energy, and Injection Strategy on Lean and EGR Dilute Spark Ignition Combustion journal March 2017
Measurements of laminar burning velocities for natural gas–hydrogen–air mixtures journal July 2006
A New Droplet Collision Algorithm journal October 2000
Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model journal January 1999
A New Two-Constant Equation of State journal February 1976
KIVA-3V: A block-structured KIVA program for engines with vertical or canted valves report July 1997
Investigation of real gas effects on combustion and emissions in internal combustion engines and implications for development of chemical kinetics mechanisms journal December 2017
Modeling Autoignition and Engine Knock Under Spark Ignition Conditions conference March 2003
Fuel Effects on SIDI Efficiency and Emissions conference October 2003
Effects of Heat of Vaporization and Octane Sensitivity on Knock-Limited Spark Ignition Engine Performance conference April 2018
Correlation of autoignition phenomena in internal combustion engines and rapid compression machines journal January 1955
Cycle-to-Cycle Variations in Multi-Cycle Engine RANS Simulations conference April 2016

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Related Subjects

DISI
KLSA
heat of vaporization
knock
laminar flame speed