In Situ Detailed Chemistry Calculations in Combustor Flow Analyses

1999 ◽  
Vol 123 (4) ◽  
pp. 747-756 ◽  
Author(s):  
S. James ◽  
M. S. Anand ◽  
M. K. Razdan ◽  
S. B. Pope
Keyword(s):  
Computational Cost ◽  
Reacting Flows ◽  
Design System ◽  
Reacting Flow ◽  
Turbulent Reacting Flows ◽  
Combustion Chemistry ◽  
Detailed Chemistry ◽  
Combustion Modeling ◽  
Reaction Equations

In the numerical simulation of turbulent reacting flows, the high computational cost of integrating the reaction equations precludes the inclusion of detailed chemistry schemes, therefore reduced reaction mechanisms have been the more popular route for describing combustion chemistry, albeit at the loss of generality. The in situ adaptive tabulation scheme (ISAT) has significantly alleviated this problem by facilitating the efficient integration of the reaction equations via a unique combination of direct integration and dynamic creation of a look-up table, thus allowing for the implementation of detailed chemistry schemes in turbulent reacting flow calculations. In the present paper, the probability density function (PDF) method for turbulent combustion modeling is combined with the ISAT in a combustor design system, and calculations of a piloted jet diffusion flame and a low-emissions premixed gas turbine combustor are performed. It is demonstrated that the results are in good agreement with experimental data and computations of practical turbulent reacting flows with detailed chemistry schemes are affordable.

scholarly journals In Situ Detailed Chemistry Calculations in Combustor Flow Analyses

1999 ◽  
Author(s):  
S. James ◽  
M. S. Anand ◽  
M. K. Razdan ◽  
S. B. Pope
Keyword(s):  
Computational Cost ◽  
Reacting Flows ◽  
Design System ◽  
Reacting Flow ◽  
Turbulent Reacting Flows ◽  
Combustion Chemistry ◽  
Detailed Chemistry ◽  
Combustion Modeling ◽  
Reaction Equations

In the numerical simulation of turbulent reacting flows, the high computational cost of integrating the reaction equations precludes the inclusion of detailed chemistry schemes, therefore reduced reaction mechanisms have been the more popular route for describing combustion chemistry, albeit at the loss of generality. The in situ adaptive tabulation scheme (ISAT) has significantly alleviated this problem by facilitating the efficient integration of the reaction equations via a unique combination of direct integration and dynamic creation of a look-up table, thus allowing for the implementation of detailed chemistry schemes in turbulent reacting flow calculations. In the present paper, the probability density function (PDF) method for turbulent combustion modeling is combined with the ISAT in a combustor design system, and calculations of a piloted jet diffusion flame and a low-emissions premixed gas turbine combustor are performed. It is demonstrated that the results are in good agreement with experimental data and computations of practical turbulent reacting flows with detailed chemistry schemes are affordable.

Numerical Simulation for Free Turbulent Reacting Flow by Particle Method

2003 ◽  
Author(s):  
Tomomi Uchiyama ◽  
Naohiro Otsuki
Keyword(s):  
Numerical Simulation ◽  
Chemical Reaction ◽  
Mixing Layer ◽  
Particle Method ◽  
Reacting Flows ◽  
Single Step ◽  
Reacting Flow ◽  
Turbulent Reacting Flows ◽  
Plane Mixing Layer ◽  
Irreversible Chemical Reaction

This paper presents a particle method for free turbulent reacting flows. The vorticity and concentration fields are discretized into the vortex and concentration elements, respectively, and the behavior of the elements is calculated with the Lagrangian method. The chemical reaction is estimated through the Lagrangian calculation for the strength of concentration element. The particle method is applied to simulate a plane mixing layer with a single-step and irreversible chemical reaction of non-premixed reactants so as to discuss the applicability.

Reynolds Analog in Combustor Modeling

2007 ◽  
Author(s):  
Lei-Yong Jiang ◽  
Ian Campbell
Keyword(s):  
Schmidt Number ◽  
Scalar Fields ◽  
Reacting Flows ◽  
Operating Conditions ◽  
Combustion Model ◽  
Reacting Flow ◽  
Turbulent Reacting Flows ◽  
Reynolds Analogy ◽  
Experimental Database ◽  
Advanced Combustion

Accurate temperature prediction is vital for the development of advanced combustion systems. The Reynolds analogy concept has been almost exclusively used in current turbulent reacting flow RANS simulations. In this paper, this hypothesis applied to a diffusion flame model combustor is discussed and assessed. Some of the numerical results obtained from a flamelet combustion model with the turbulence Prandtl/Schmidt number from 0.25 to 0.85 are presented, and compared with a benchmark experimental database. It is found that the turbulence Prandtl/Schmidt number has significant effect on the predicted temperature and species fields inside the combustor, as well as the temperature profile at the combustor wall. In contrast, its effect on the velocity field is insignificant in the range assessed. With the optimized turbulence Prandtl/Schmidt number, both velocity and scalar fields can be reasonably and quantitatively predicted. For the present configuration and operating conditions, the optimal Prandtl/Schmidt number is 0.5, lower than the commonly accepted values, ∼0.70. This study suggests that for accurate prediction of scalar transfers in turbulent reacting flows, the Reynolds analogy concept should be improved and new approaches should be developed.

CFD Analysis of a SGT-800 Burner in a Combustion Rig

2016 ◽  
Author(s):  
Abdallah Abou-Taouk ◽  
Niklas Andersson ◽  
Lars-Erik Eriksson ◽  
Daniel Lörstad
Keyword(s):  
Atmospheric Pressure ◽  
Laminar Flame ◽  
Computational Cost ◽  
Measurement Data ◽  
Interaction Model ◽  
Optimization Procedure ◽  
Reacting Flow ◽  
Operating Pressure ◽  
Test Rig ◽  
Detailed Chemistry

This work focuses on 3D turbulent reacting flow modeling of a SGT-800 3rd generation dry low emission (DLE) burner at both atmospheric and engine-like conditions. At atmospheric pressure the burner is fitted in a test rig with high pre-heating of the incoming air. To reduce the computational cost, the M4 mechanism previously developed by Abou-Taouk et al. (2013) is used for operating pressure of 1 bar. A new novel optimized 4-step reaction mechanism for methane-air mixture is developed in the present work at an operating pressure of 20 bar. The mechanism is based on a large sample of detailed chemistry solutions that are processed by an iterative optimization procedure. This leads to a reduced 4-step mechanism, reproducing the targeted detailed chemistry solutions in terms of laminar flame speeds, species profiles and temperatures. The CFD simulations are performed using the combined eddy dissipation model / finite rate chemistry (EDM/FRC) turbulence chemistry interaction model. The turbulence is modeled using both the k-ω SST and the scale adaptive simulation (SAS) turbulence models. A comprehensive testing and measurement campaign carried out at atmospheric pressure for this burner was previously performed in a combustion test rig. The CFD results are compared to measurement data which includes for example flame position and pressure drop.

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