Stability limit of a bluff-body-stabilized lean premixed turbulent flame

2019 ◽  
Author(s):  
Hyunseob Lee ◽  
Bok Jik Lee
Keyword(s):  
Bluff Body ◽  
Turbulent Flame ◽  
Stability Limit ◽  
Lean Premixed ◽  
Premixed Turbulent Flame

Numerical Modeling of Stationary But Developing Premixed Turbulent Flames

2006 ◽  
Author(s):  
Pratap Sathiah ◽  
Andrei N. Lipatnikov
Keyword(s):  
Bluff Body ◽  
Burning Velocity ◽  
Rectangular Channel ◽  
Turbulent Flame ◽  
Flame Stabilization ◽  
Turbulent Flames ◽  
Turbulent Diffusivity ◽  
Flame Thickness ◽  
Premixed Turbulent Flames ◽  
Premixed Turbulent Flame

A typical stationary premixed turbulent flame is the developing flame, as indicated by the growth of mean flame thickness with distance from flame-stabilization point. The goal of this work is to assess the importance of modeling flame development for RANS simulations of confined stationary premixed turbulent flames. For this purpose, submodels for developing turbulent diffusivity and developing turbulent burning velocity, which were early suggested by our group (FSC model) and validated for expanding spherical flames [4], have been incorporated into the so-called Zimont model of premixed turbulent combustion and have been implemented into the CFD package Fluent 6.2. The code has been run to simulate a stationary premixed turbulent flame stabilized behind a triangular bluff body in a rectangular channel using both the original and extended models. Results of these simulations show that the mean temperature and velocity fields in the flame are markedly affected by the development of turbulent diffusivity and burning velocity.

Application of the Dynamic F-TACLES Combustion Model to a Lean Premixed Turbulent Flame

2015 ◽  
Vol 95 (2-3) ◽  
pp. 481-500 ◽  
Author(s):  
A. Hosseinzadeh ◽  
T. Schmitt ◽  
A. Sadiki ◽  
J. Janicka
Keyword(s):  
Turbulent Flame ◽  
Combustion Model ◽  
Lean Premixed ◽  
Premixed Turbulent Flame

scholarly journals Modelling of a Bluff-Body Stabilised Premixed Flames Close to Blow-Off

Computation ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 43
Author(s):  
Shokri Amzin ◽  
Mohd Fairus Mohd Yasin
Keyword(s):  
Bluff Body ◽  
Fluid Dynamic ◽  
Premixed Flames ◽  
Pollutant Emissions ◽  
Moment Closure ◽  
Recirculation Region ◽  
Scalar Dissipation ◽  
Average Error ◽  
Conditional Moment ◽  
Lean Premixed

As emission legislation becomes more stringent, the modelling of turbulent lean premixed combustion is becoming an essential tool for designing efficient and environmentally friendly combustion systems. However, to predict emissions, reliable predictive models are required. Among the promising methods capable of predicting pollutant emissions with a long chemical time scale, such as nitrogen oxides (NOx), is conditional moment closure (CMC). However, the practical application of this method to turbulent premixed flames depends on the precision of the conditional scalar dissipation rate,. In this study, an alternative closure for this term is implemented in the RANS-CMC method. The method is validated against the velocity, temperature, and gas composition measurements of lean premixed flames close to blow-off, within the limit of computational fluid dynamic (CFD) capability. Acceptable agreement is achieved between the predicted and measured values near the burner, with an average error of 15%. The model reproduces the flame characteristics; some discrepancies are found within the recirculation region due to significant turbulence intensity.

Effects of preferential transport in turbulent bluff-body-stabilized lean premixed CH4/air flames

2012 ◽  
Vol 159 (8) ◽  
pp. 2563-2575 ◽  
Author(s):  
Robert S. Barlow ◽  
Matthew J. Dunn ◽  
Mark S. Sweeney ◽  
Simone Hochgreb
Keyword(s):  
Bluff Body ◽  
Lean Premixed ◽  
Preferential Transport

Comparison of a spectral model for premixed turbulent flame propagation to DNS and experiments

2000 ◽  
Vol 4 (3) ◽  
pp. 241-264 ◽  
Author(s):  
Mark Ulitsky ◽  
Chaouki Ghenaï ◽  
Iskender Gökalp ◽  
Lian-Ping Wang ◽  
Lance R Collins
Keyword(s):  
Flame Propagation ◽  
Turbulent Flame ◽  
Spectral Model ◽  
Premixed Turbulent Flame
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