Premixed Combustion Finite Rate/No TCI CFD Simulation

Premixed Combustion Finite Rate/No TCI Simulation

Welcome to the fifth episode of our comprehensive “Combustion: All Levels” course. In this advanced lesson, we delve into the intricacies of premixed combustion simulation using ANSYS Fluent software, with a focus on the Finite Rate/No TCI (Turbulence-Chemistry Interaction) model. This episode builds upon previous knowledge and introduces a more detailed approach to combustion modeling.

Simulation Overview

Our simulation centers on a two-dimensional combustion chamber model, where we’ll investigate premixed combustion dynamics using a sophisticated CFD approach. This episode aims to provide in-depth insights into the chemical kinetics of combustion processes without considering turbulence-chemistry interactions.

Model Geometry and Meshing

The foundation of our simulation lies in a carefully crafted model:

• Geometry designed using Spaceclaim software for precision
• Meshing performed with ANSYS Meshing software
• Structured mesh type for optimal accuracy
• 4,800 elements ensuring detailed results while maintaining computational efficiency

This meticulous setup ensures that our simulation captures the nuances of the combustion process with high fidelity.

Simulation Methodology

Species Transport Model

We employ the Species Transport model to simulate the combustion process effectively:

• Utilization of a Chemkin mechanism file for detailed reaction modeling
• Incorporation of 35 different reactions and 17 chemical species
• Volumetric option to model combustion throughout the chamber

This approach allows for a comprehensive analysis of the complex chemical processes occurring during combustion.

Finite Rate/No TCI Model

The core of our simulation lies in the Finite Rate/No TCI model:

• Focuses on detailed kinetic mechanisms
• Neglects the effect of turbulence on chemical reactions
• Provides insights into pure chemical kinetics of combustion

This advanced model allows us to isolate and study the chemical aspects of combustion without the complicating factor of turbulence-chemistry interactions.

Additional Settings

To ensure a comprehensive simulation, we also:

• Enable the Energy equation to track temperature changes accurately
• Utilize the Standard k-epsilon model for turbulence modeling

Results and Analysis

Upon completion of the simulation, we’ll analyze a range of outputs:

• Temperature distribution contours
• Velocity profiles throughout the chamber
• Mass fractions of various species
• Streamlines revealing flow patterns

These results will provide valuable insights into:

• The progression of chemical reactions in the combustion chamber
• Temperature evolution due to chemical kinetics
• Species formation and consumption patterns

Learning Outcomes and Applications

By the end of this episode, you’ll have gained:

• Advanced understanding of premixed combustion simulation techniques
• Insights into the Finite Rate/No TCI model and its applications
• Skills to interpret CFD results for detailed chemical kinetics analysis
• Knowledge of how to isolate and study chemical aspects of combustion

These skills are directly applicable to:

• Developing more efficient combustion systems
• Optimizing fuel compositions for specific applications
• Understanding pollutant formation mechanisms at a chemical level
• Advancing research in combustion chemistry

Join us in this cutting-edge exploration of premixed combustion simulation using the Finite Rate/No TCI model, and elevate your CFD expertise to new heights in chemical kinetics modeling!