DEVELOPMENT OF A TURBULENT FLAME SPEED MODEL BASED ON FLAME STRETCH CONCEPT FOR SPARK IGNITION ENGINES

2017 ◽  
Author(s):  
Behdad Afkhami
Keyword(s):  
Turbulent Flame ◽  
Spark Ignition ◽  
Flame Speed ◽  
Spark Ignition Engines ◽  
Turbulent Flame Speed ◽  
Model Based ◽  
Flame Stretch

Impact of Fuel Properties and Flame Stretch on the Turbulent Flame Speed in Spark-Ignition Engines

2013 ◽  
Author(s):  
Pierre Brequigny ◽  
Christine Mounaïm-Rousselle ◽  
Fabien Halter ◽  
Bruno Moreau ◽  
Thomas Dubois
Keyword(s):  
Turbulent Flame ◽  
Spark Ignition ◽  
Flame Speed ◽  
Fuel Properties ◽  
Spark Ignition Engines ◽  
Turbulent Flame Speed ◽  
Flame Stretch

Spark Ignition Simulations and the Generation of Ignition Maps by Means of a Turbulent Flame Speed Closure Approach

2010 ◽  
Author(s):  
Jan M. Boyde ◽  
Massimiliano Di Domenico ◽  
Berthold Noll ◽  
Manfred Aigner
Keyword(s):  
Turbulent Flame ◽  
Spark Ignition ◽  
Flame Speed ◽  
Test Case ◽  
Ignition Energy ◽  
Mean Flow ◽  
Flame Kernel ◽  
Turbulent Flame Speed ◽  
Flow Parameters ◽  
Partially Premixed

This paper presents a numerical investigation of ignition phenomena in turbulent partially premixed methane/air flames. In this work, a turbulent flame speed closure model (TFC) is employed with an ignition delay module extension. The model is applied to two partially premixed test cases under standard conditions in the configuration of a shearless flame and a counter flow flame, respectively. For both setups, the flame kernel propagation and consequent establishment or extinction of the flame are examined. A shearless configuration represents the first test case under investigation. The study demonstrates the large influence of the mean flow parameters on achieving a successful ignition of the domain. The second test case under examination is a counterflow geometry. A sensitivity analysis with respect to spark ignition position and ignition energy is performed. The simulations show that flame kernel spreading is largely influenced by the magnitude of turbulence occurring in the flow, leading to an enhanced propagation in areas with a moderate turbulence degree, whereas high turbulence can be detrimental for the flame establishment due to extensive heat losses. Another observation is that a successful ignition of the domain can occur, even in cases in which the ignition energy is not placed in an area with flammable mixture. The comparison with experimental data shows a good agreement, both in terms of successful ignition and flame kernel propagation.

scholarly journals A MEAN VALUE MODEL FOR ESTIMATION OF LAMINAR AND TURBULENT FLAME SPEED IN SPARK-IGNITION ENGINE

2015 ◽  
Vol 11 ◽  
pp. 2224-2234 ◽  
Author(s):  
Ali Ghanaati ◽  
◽  
Intan Z. Mat Darus ◽  
Mohd Farid Muhamad Said ◽  
Amin Mahmoudzadeh Andwari ◽  
...  
Keyword(s):  
Turbulent Flame ◽  
Spark Ignition ◽  
Mean Value ◽  
Flame Speed ◽  
Spark Ignition Engine ◽  
Turbulent Flame Speed ◽  
Mean Value Model ◽  
Value Model

scholarly journals Numerical Investigation of Pressure Influence on the Confined Turbulent Boundary Layer Flashback Process

Fluids ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 146 ◽  
Author(s):  
Aaron Endres ◽  
Thomas Sattelmayer
Keyword(s):  
Boundary Layer ◽  
Gas Turbines ◽  
Separation Zone ◽  
Turbulent Flame ◽  
Pressure Rise ◽  
Flame Speed ◽  
Zone Size ◽  
Detailed Chemical Kinetics ◽  
Turbulent Flame Speed ◽  
Quenching Distance

Boundary layer flashback from the combustion chamber into the premixing section is a threat associated with the premixed combustion of hydrogen-containing fuels in gas turbines. In this study, the effect of pressure on the confined flashback behaviour of hydrogen-air flames was investigated numerically. This was done by means of large eddy simulations with finite rate chemistry as well as detailed chemical kinetics and diffusion models at pressures between 0 . 5 and 3 . It was found that the flashback propensity increases with increasing pressure. The separation zone size and the turbulent flame speed at flashback conditions decrease with increasing pressure, which decreases flashback propensity. At the same time the quenching distance decreases with increasing pressure, which increases flashback propensity. It is not possible to predict the occurrence of boundary layer flashback based on the turbulent flame speed or the ratio of separation zone size to quenching distance alone. Instead the interaction of all effects has to be accounted for when modelling boundary layer flashback. It was further found that the pressure rise ahead of the flame cannot be approximated by one-dimensional analyses and that the assumptions of the boundary layer theory are not satisfied during confined boundary layer flashback.

scholarly journals Extension of the turbulent flame speed closure model to ignition in multiphase flows

2013 ◽  
Vol 160 (2) ◽  
pp. 351-365 ◽  
Author(s):  
Jan M. Boyde ◽  
Patrick C. Le Clercq ◽  
Massimiliano Di Domenico ◽  
Manfred Aigner
Keyword(s):  
Multiphase Flows ◽  
Turbulent Flame ◽  
Flame Speed ◽  
Closure Model ◽  
Turbulent Flame Speed
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