Numerical analysis of a downsized spark-ignition engine fueled by butanol/gasoline blends at part-load operation

Abstract A thermodynamic cycle simulation was developed for a spark-ignition engine which included the use of multiple zones for the combustion process. This simulation was used to complete analyses for a commercial, spark-ignition V-8 engine operating at a part load condition. Specifically, the engine possessed a compression ratio of 8.1:1, and had a bore and stroke of 101.6 and 88.4 mm, respectively. A part load operating condition at 1400 rpm with an equivalence ratio of 1.0 was examined. Results were obtained for overall engine performance, for detailed in-cylinder events, and for the thermodynamics of the individual processes. In particular, the characteristics of the engine operation with respect to the combustion process were examined. Implications of the multiple zones formulation for the combustion process are described.

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Numerical analysis of the influence of early fuel injection on charge motion in a direct injection spark ignition engine using scale-resolving simulations

International Journal of Engine Research ◽

10.1177/1468087419860725 ◽

2019 ◽

Vol 21 (4) ◽

pp. 664-682

Author(s):

Martin Theile ◽

Martin Reißig ◽

Egon Hassel ◽

Dominique Thévenin ◽

Martin Hofer ◽

...

Keyword(s):

Numerical Analysis ◽

Flow Field ◽

Fuel Injection ◽

Direct Injection ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Post Processing ◽

Charge Motion ◽

Set Up ◽

Direct Injection Spark Ignition

This work summarizes the numerical analysis of the effect of early fuel injection on the charge motion in a direct injection spark ignition engine concerning cyclic fluctuations of the flow field. The combination of the scale-resolving turbulence model “Scale Adaptive Simulation” and post-processing routines for vortex trajectory visualization allows for a detailed insight into the temporal resolved and cycle-dependent behavior of the charge motion. In the first part, a simplified engine set-up is presented and used as a validation case to ensure correct behavior of the turbulence model and post-processing routines. In the second part, the computational fluid dynamics model of the real engine is introduced. The application of the proposed vortex tracking algorithm is shown, and a short discussion about the transient behavior of the charge motion in this engine set-up is given. The third part describes the analysis of the influence of the fuel injection on the charge motion at different engine speeds from 1000 to 3000 r/min and variations of the intake pressure from 1 to 2 bar. Finally, the impact on different flow field properties at possible ignition timings is discussed. Changes in mean flow field quantities as well as in aerodynamic fluctuations are found as a consequence of fuel injection.

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Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.798.234 ◽

2015 ◽

Vol 798 ◽

pp. 234-238

Author(s):

Fábio Radicchi ◽

Raphael M. Braga ◽

Raniro A. Coelho ◽

Roberto B.R. Costa ◽

Ramon Molina Valle

Keyword(s):

Fluid Flow ◽

Numerical Analysis ◽

3D Model ◽

Combustion Engine ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Spark Ignition Engines ◽

Flow Investigation ◽

Pollutants Emission ◽

Turbulence Parameters

Torch ignition systems in spark-ignition engines represents an interesting option in the efforts to reduce pollutants emission and specific fuel consumption. Based on this idea, this paper presents a 3D model of a prechamber created for a spark-ignition engine and focuses on the numerical analysis of the fluid flow inside the modified chamber. This kind of analysis is very important once it allowed evaluating aspects like turbulence parameters, pressure inside the chamber and prechamber, fluid recirculation and a possible prechamber’s geometry for the engine. The studies were done in a four valve Single Cylinder Research Engine – SCRE. For the numerical modeling and fluid flow investigation was used STAR-CD software. Results show higher values of tumble ratio and kinetic energy with the prechamber.

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Intake Port Phenomena in a Spark-Ignition Engine at Part Load

10.4271/912401 ◽

1991 ◽

Cited By ~ 33

Author(s):

Chun-On Cheng ◽

Wai K. Cheng ◽

John B. Heywood ◽

Damien Maroteaux ◽

Nick Collings

Keyword(s):

Spark Ignition ◽

Spark Ignition Engine ◽

Intake Port ◽

Part Load

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