Development of a Novel Flame Propagation Model (UCFM: Universal Coherent Flamelet Model) for SI Engines and Its Application to Knocking Prediction

2005 ◽  
Author(s):  
Atsushi Teraji ◽  
Tsuyoshi Tsuda ◽  
Toru Noda ◽  
Masaaki Kubo ◽  
Teruyuki Itoh
Keyword(s):  
Flame Propagation ◽  
Propagation Model ◽  
Flamelet Model ◽  
Si Engines

Development of a three-dimensional knock simulation method incorporating a high-accuracy flame propagation model

2005 ◽  
Vol 6 (1) ◽  
pp. 73-83 ◽  
Author(s):  
A Teraji ◽  
T Tsuda ◽  
T Noda ◽  
M Kubo ◽  
T Itoh
Keyword(s):  
Combustion Chamber ◽  
Flame Propagation ◽  
Turbulence Intensity ◽  
Engine Speed ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Propagation Model ◽  
General Tendency ◽  
Flamelet Model ◽  
Flame Kernel

Combustion in internal combustion (IC) engines involves very complicated phenomena (including flame propagation and knock), which are strongly affected by engine speed, load, and turbulence intensity in the combustion chamber. The aim of this study was to develop a flame propagation model and a knock prediction technique applicable to various engine operating conditions, including engine speed and in-cylinder turbulence intensity. A new flame propagation model, the universal coherent flamelet model (UCFM) has been developed that improves the coherent flamelet model (CFM) by considering flame growth both in terms of the turbulent flame kernel and laminar flame kernel. A knock prediction model was developed by implementing the Livengood-Wu integral as the autoignition model in the flame propagation model. The combined model allows evaluation of both where and when autoignition occurs in a real shape combustion chamber. A comparison of the measured and calculated time for the occurrence of knock shows good agreement for various operating conditions. The three-dimensional calculation results indicate the general tendency for the location where autoignition occurs in the combustion chamber and the effect of the spark plug position on the occurrence of knock.

On the use of a tabulation approach to model auto-ignition during flame propagation in SI engines

2011 ◽  
Vol 88 (12) ◽  
pp. 4968-4979 ◽  
Author(s):  
Vincent Knop ◽  
Jean-Baptiste Michel ◽  
Olivier Colin
Keyword(s):  
Flame Propagation ◽  
Auto Ignition ◽  
Si Engines

scholarly journals Development of Flame Propagation Model for SI Engine and Its Application to Knoking Prediction

2005 ◽  
Vol 71 (710) ◽  
pp. 2581-2587
Author(s):  
Atsushi TERAJI ◽  
Tsuyoshi TSUDA ◽  
Toru NODA ◽  
Masaaki KUBO ◽  
Teruyuki ITOH
Keyword(s):  
Flame Propagation ◽  
Propagation Model ◽  
Si Engine

Validation of an Ignition and Flame Propagation Model for Multiphase Flows

2011 ◽  
Author(s):  
J. M. Boyde ◽  
P. Le Clercq ◽  
M. Di Domenico ◽  
M. Rachner ◽  
G. C. Gebel ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Flame Propagation ◽  
Multiphase Flows ◽  
Numerical Models ◽  
Turbulent Flame ◽  
Propagation Model ◽  
Test Case ◽  
Turbulent Flame Speed ◽  
Propagation Behavior ◽  
Ignition Characteristics

This paper presents a numerical investigation of a generic lab scale combustor with focus on the ignition characteristics. The test case has been examined thoroughly in a comprehensive measurement campaign to provide a detailed set of boundary conditions and a profound data base of results. The experimental setup comprises five parallel-aligned mono-disperse droplet chains which are ignited, using a focused laser beam. One aspect of the experimental study is the ignitability with respect to the imposed boundary conditions. The second covers the growth and the propagation of the flame after the establishment of an initial kernel. The outcome of the numerical simulations is compared to the experimental results which allows an in-depth assessment of the employed numerical models. The chemistry and, thus, the flame propagation behavior is captured by a turbulent flame speed closure approach with an adaptation to render the model suitable to multiphase flows. For the dispersed phase a Lagrangian particle tracking scheme is employed in combination with a continuous thermodynamics fuel model for the evaporation. The overall good agreement demonstrates the capability of a multiphase flow CFD solver in the field of ignition modeling.

scholarly journals Effect of Sisal Nanoparticles on Single Cylinder Spark Ignition Engine Combustion

2020 ◽  
Vol 8 (6) ◽  
pp. 1027-1032
Keyword(s):  
Flame Propagation ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Spark Ignition ◽  
Combustion Efficiency ◽  
Spark Ignition Engine ◽  
Single Cylinder ◽  
Engine Combustion ◽  
Si Engines ◽  
Propagation Velocities

Turbulence is an important parameter to be considered for effective combustion inside a cylinder. Heat transfer inside the cylinder affects the combustion process. Insufficient turbulence leads to incomplete combustion, resulting in pollution. Effective flame propagation leads to higher combustion rates in SI engines which in turn requires enough turbulence. Effective combustion efficiency can be achieved through higher flame propagation velocities. In the present work an attempt has been made to enhance the turbulence inside the cylinder of a single cylinder spark ignition engine by injecting solid nanoparticles into the air fuel mixture.

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