scholarly journals Effects of LPG and DME Spatial Distributions on Combustion in LPG-DME Spark Ignition Engine -Three-dimensional Numerical Analysis Based on Chemical Kinetic Mode

2010 ◽  
Vol 45 (1) ◽  
pp. 103-108
Author(s):  
Hiroshi Omote ◽  
Yamanaka Yuichi ◽  
Tohru Nakazono ◽  
Yogo Takada ◽  
Tomoyuki Wakisaka
Keyword(s):  
Numerical Analysis ◽  
Three Dimensional ◽  
Spark Ignition ◽  
Chemical Kinetic ◽  
Spark Ignition Engine ◽  
Spatial Distributions ◽  
Kinetic Mode

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

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.

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

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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