Investigation of the mixture formation process with combined injection strategies in high-performance SI-engines

2016 ◽  
pp. 1233-1249 ◽  
Author(s):  
Daniel Koch ◽  
G. Wachtmeister ◽  
Marlene Wentsch ◽  
M. Chiodi ◽  
Michael Bargende ◽  
...  
Keyword(s):  
Formation Process ◽  
High Performance ◽  
Mixture Formation ◽  
Si Engines ◽  
Injection Strategies

Optimization of the Mixture Formation for Combined Injection Strategies in High-Performance SI-Engines

2015 ◽  
Author(s):  
Christian Pötsch ◽  
Laura Sophie Baumgartner ◽  
Daniel Koch ◽  
Felix Bernhard ◽  
Bastian Beyfuss ◽  
...  
Keyword(s):  
High Performance ◽  
Mixture Formation ◽  
Si Engines ◽  
Injection Strategies

scholarly journals Evaluation of the Mixture Formation Process of High Performance Engine with a Combined Experimental and Numerical Methodology

2014 ◽  
Vol 45 ◽  
pp. 869-878 ◽  
Author(s):  
Claudio Forte ◽  
Gian Marco Bianchi ◽  
Enrico Corti ◽  
Buono Michele ◽  
Fantoni Stefano
Keyword(s):  
Formation Process ◽  
High Performance ◽  
Mixture Formation

scholarly journals Numerical Study on the Required Surrounding Gas Conditions for Stable Autoignition of an Ethanol Spray

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Hironori Saitoh ◽  
Koji Uchida ◽  
Norihiko Watanabe
Keyword(s):  
Formation Process ◽  
High Performance ◽  
Alternative Fuels ◽  
Fuel Injection ◽  
Numerical Study ◽  
Gas Pressure ◽  
Compression Ignition ◽  
Mixture Formation ◽  
Diesel Fuels ◽  
Heat Of Evaporation

This study deals with the development of controlled-ignition technology for high-performance compression ignition alcohol engines. Among the alcohol fuels, we focus on ethanol as it is a promising candidate of alternative fuels replacing petroleum. The objective of this study is to reveal the physical and chemical phenomena in the mixture formation process up to autoignition of an ethanol spray. In our previous numerical study, we showed the mixture formation process for gas oil and ethanol sprays in the form of spatial excess air ratio and temperature distributions inside a spray and their temporal histories from fuel injection. The results showed a good agreement with those of theoretical analysis based on the momentum theory of spray penetration. Calculation was also confirmed as reasonable by comparing to the experimental results. Through the series of our experimental and numerical studies, the reason for poor autoignition quality of an ethanol spray was revealed, that is, difficulty in simultaneous attainments of autoignition-suitable concentration and temperature in the spray mixture formation due to its fuel and thermal properties of smaller stoichiometric air-fuel ratio and much greater heat of evaporation compared to conventional diesel fuels. However, autoignition of an ethanol spray has not been obtained yet in either experiments or numerical analysis. As the next step, we numerically examined several surrounding gas pressure and temperature conditions to make clear the surrounding gas conditions enough to obtain stable autoignition. One of the commercial CFD codes CONVERGE was used in the computational calculation with the considerations of turbulence, atomization, evaporation, and detailed chemical reaction. Required surrounding gas pressure and temperature for stable autoignition with acceptable ignition delay of an ethanol spray and feasibility of the development of high-performance compression ignition alcohol engines are discussed in this paper.

Multi-dimensional modeling of the air/fuel mixture formation process in a PFI engine for motorcycle applications

2009 ◽  
Author(s):  
T. Lucchini ◽  
G. D'Errico ◽  
F. Brusiani ◽  
G. M. Bianchi ◽  
Ž. Tuković ◽  
...  
Keyword(s):  
Formation Process ◽  
Fuel Mixture ◽  
Mixture Formation ◽  
Dimensional Modeling

CFD Methodology for the Simulation of Mixture Formation of High Performance PFI Engines

2011 ◽  
Author(s):  
Claudio Forte ◽  
Gian Marco Bianchi ◽  
Enrico Corti ◽  
Gaspare Argento ◽  
Stefano Fantoni
Keyword(s):  
High Performance ◽  
Experimental Tests ◽  
Critical Issue ◽  
Spark Ignition Engines ◽  
Mixture Formation ◽  
Injection Process ◽  
Cfd Models ◽  
Cycle Simulation ◽  
Spark Plug ◽  
The Stability

Mixture composition strongly influences the stability of combustion of spark ignition engines. The control of air to fuel ratio at ignition is a critical issue for high performance engines: due to the low stroke-to-bore ratio the maximum power is reached at very high regimes, letting little time to the fuel to evaporate and mix with air. The aim of this work is to present a CFD methodology for the evaluation of mixture formation applied to a Ducati high performance engine. The phenomena involved in the process are highly heterogeneous, and particular care must be taken to the choice of CFD models and their validation. In the present work all the main models involved in the simulations are validated against experimental tests available in the literature, selected based on the similarity of physical conditions with those of the engine configuration under analysis. The multi-cycle simulation methodology here presented reveals to be a useful tool for the evaluation of the mixture quality around the spark plug at ignition, allowing a parametric analysis of the effects of the injection process on engine output.

Enhanced Investigations of High-Performance SI-Engines by Means of 3D-CFD Simulations

2015 ◽  
Author(s):  
Marlene Wentsch ◽  
Antonella Perrone ◽  
Marco Chiodi ◽  
Michael Bargende ◽  
Donatus Wichelhaus
Keyword(s):  
High Performance ◽  
Cfd Simulations ◽  
Si Engines

Multi-Cycle Simulation of the Mixture Formation Process of an High Performance Engine at Part Load Condition

2012 ◽  
Author(s):  
Claudio Forte ◽  
Gian Marco Bianchi ◽  
Enrico Corti ◽  
Stefano Fantoni
Keyword(s):  
High Performance ◽  
Load Condition ◽  
Experimental Tests ◽  
Fuel Mixture ◽  
Critical Issue ◽  
Transient Condition ◽  
Mixture Formation ◽  
Part Load ◽  
Cycle Simulation ◽  
Load Conditions

Transient operation of engines leads to air fuel (A/F) ratio excursions, which can increase engine emissions. These excursions have been attributed to the formation of fuel films in the intake port, which are caused by a portion of the intake fuel impinging and adhering on the relatively cool port surface. These films act as a source or sink which cause the AF variations depending upon the transient condition. Gaining a fundamental understanding of the nature and quantity of such films may assist in future fuel mixture preparation designs that could aid in emission reductions, yet would not require overly expensive nor complicated systems. The control of air to fuel ratio is a critical issue for high performance engines: due to the low stroke-to-bore ratio the maximum power is reached at very high regimes, letting little time to the fuel to evaporate and mix with air. The injector located upstream the throttle causes a lot of fuel to impinge the throttle and intake duct walls, slowing the dynamics of mixture formation in part load conditions. The aim of this work is to present a CFD methodology for the evaluation of mixture formation dynamics applied to a Ducati high performance engine under part load conditions. The phenomena involved in the process are highly heterogeneous, and particular care must be taken to the choice of CFD models and their validation. In the present work all the main models involved in the simulations are validated against experimental tests available in the literature, selected based on the similarity of physical conditions of those of the engine configuration under analysis. The multi-cycle simulation methodology here presented reveals to be a useful tool for the evaluation of the mixture dynamics and for the evaluation of injection wall film compensator models.

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