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Chapter 14: Using the Eddy Dissipation and Steady Diffusion Flamelet Combustion Models

This tutorial is divided into the following sections:

14.1.Introduction

14.2.Prerequisites

14.3.Problem Description

14.4.Setup and Solution

14.5.Steady Diffusion Flamelet Model Setup and Solution

14.6.Summary

14.1. Introduction

This tutorial examines the reacting flow through a can combustor that burns methane in air in order to determine the combustor performance. In this tutorial, you will first simulate the combustion process using the Eddy Dissipation model. You will then repeat the simulation using the steady flamelet model and compare the results of these two approaches.

This tutorial demonstrates how to do the following:

•Set up a combustion simulation in ANSYS Fluent.

•Set up a reacting flow involving fuel and oxidizer.

•Use the Eddy Dissipation model.

•Use the Steady Diffusion Flamelet model.

•Display the results obtained using these two models.

14.2. Prerequisites

This tutorial is written with the assumption that you have completed the introductory tutorial Fluid Flow and Heat Transfer in a Mixing Elbow (p. 35) found in this manual and that you are familiar with the ANSYS Fluent tree and ribbon structure. Some steps in the setup and solution procedure will not be shown explicitly.

14.3. Problem Description

A can type combustor is a component of a land-based gas turbine in which combustion occurs. Can combustors are designed to burn the fuel efficiently, minimize the emissions, and reduce the wall temperature. The can combustor to be considered in this tutorial is shown schematically in Fig-

ure 14.1: Can Combustor Geometry (p. 482).

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