Simulation of Piloted Jet Flame by Unsteady Laminar Flamelet Model
In this tutorial, we provide guidelines for modeling and simulation of a piloted jet flame employing the unsteady laminar flamelet model.
Using the steady laminar flamelet model, we are able to model local chemical non-equilibrium due to the turbulent aerodynamic straining. With this model, we can simulate OH radical accurately, since it responds to turbulent straining rapidly. But, we cannot model species such as NOx, and in some cases CO, because the concentrations of these species depend on their previous molecular mixing and subsequent reaction.
It is possible to model NOx with the pollutant post-processing model. In addition, one can simulate NOx and CO by employing the laminar finite-rate, eddy-dissipation concept (EDC) or PDF transport models. However, due to the fact that the chemistry is computed in every cell, the computational cost of these models are very high. We need a converged steady flamelet solution to run the unsteady flamelet model.
You will also learn how to do the following through this tutorial:
- Importing a CHEMKIN mechanism and generating steady flamelets to solve the problem
- Obtaining a converged solution for steady flamelet
- Find the solution for the unsteady case
- Also, analyzing the results
Problem Description for Simulation of Piloted Jet Flame
We are able to model slow species formation with unsteady laminar flamelet approach. This model has application in modeling the formation of NO in gas-phase reactors and product compounds in liquid reactors. We conduct expensive chemical kinetic calculations in one-dimension. Therefore, it is possible to simulate 3D geometries with detailed chemical mechanisms.
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