Substantiating a fractal-based algebraic reaction closure of premixed turbulent combustion for high pressure and the Lewis number effects

2006 ◽  
Vol 145 (4) ◽  
pp. 663-674 ◽  
Author(s):  
N ALURI ◽  
S REDDYMUPPALA ◽  
F DINKELACKER
Keyword(s):  
High Pressure ◽  
Turbulent Combustion ◽  
Lewis Number ◽  
Premixed Turbulent Combustion

Evaluation of CH4/NOx Reduced Mechanisms Used for Modeling Lean Premixed Turbulent Combustion of Natural Gas

1998 ◽  
Vol 120 (4) ◽  
pp. 703-712 ◽  
Author(s):  
H. P. Mallampalli ◽  
T. H. Fletcher ◽  
J. Y. Chen
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Gas Turbine ◽  
Turbulent Combustion ◽  
Gas Turbines ◽  
Flame Structure ◽  
Computational Cost ◽  
Premixed Turbulent Combustion ◽  
Reduced Mechanism ◽  
Lean Premixed

This study has identified useful reduced kinetic schemes that can be used in comprehensive multidimensional gas-turbine combustor models. Reduced mechanisms lessen computational cost and possess the capability to accurately predict the overall flame structure, including gas temperatures and key intermediate species such as CH4, CO, and NOx. In this study, four new global mechanisms with five, six, seven, and nine steps based on the full GRI 2.11 mechanism, were developed and evaluated for their potential to model natural gas chemistry (including NOx chemistry) in gas turbine combustors. These new reduced mechanisms were optimized to model the high pressure and fuel-lean conditions found in gas turbines operating in the lean premixed mode. Based on perfectly stirred reactor (PSR) and premixed code calculations, the five-step reduced mechanism was identified as a promising model that can be used in a multidimensional gas-turbine code for modeling lean-premixed, high-pressure turbulent combustion of natural gas. Predictions of temperature, CO, CH4, and NO from the five-to nine-step reduced mechanisms agree within 5 percent of the predictions from the full kinetic model for 1 < pressure (atm) < 30, and 0.6 < φ < 1.0. If computational costs due to additional global steps are not severe, the newly developed nine step global mechanism, which is a little more accurate and provided the least convergence problems, can be used. Future experimental research in gas turbine combustion will provide more accurate data, which will allow the formulation of better full and reduced mechanisms. Also, improvement in computational approaches and capabilities will allow the use of reduced mechanisms with larger global steps, perhaps full mechanisms.

Premixed, turbulent combustion of a sudden-expansion flow

1983 ◽  
Vol 50 ◽  
pp. 153-165 ◽  
Author(s):  
Y.El Banhawy ◽  
S. Sivasegaram ◽  
J.H. Whitelaw
Keyword(s):  
Turbulent Combustion ◽  
Sudden Expansion ◽  
Premixed Turbulent Combustion

scholarly journals A Similarity Subgrid Model for Premixed Turbulent Combustion

2008 ◽  
Vol 82 (2) ◽  
pp. 233-248 ◽  
Author(s):  
A. W. Vreman ◽  
R. J. M. Bastiaans ◽  
B. J. Geurts
Keyword(s):  
Turbulent Combustion ◽  
Premixed Turbulent Combustion ◽  
Subgrid Model
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