Evaluation of a Two-Dimensional Simulation of Low Strain Rate Nonpremixed Counterflow Flames

Published

January 5, 2011

Author(s)

W Park, Anthony P. Hamins, Kevin B. McGrattan

Abstract

A mixture fraction formulation is used to numerically simulate the two-dimensional structure of diluted axisymmetric methane-air nonpremixed counterflow flames. The size of the computational domain and the grid spacing are selected based on negligible differences in time-averaged quantities. The temperature and axial velocity profiles for G=0 showed reasonable agreement with the results of the one-dimensional flame code.The method is then exercised to evaluate the effects of varying levels of gravity and local strain rate. It is shown that the numerical method is capable of predicting the structure of counterflow flames in normal and microgravity environments at low and moderate global strain rates. The temperature, and axial velocity are in reasonable agreement with those calculated by the one-dimensional OPPDIF flame code. The computed structure of the zero gravity counterflow flames show large differences with those under normal gravity conditions. The computational results confirm that the peak flame temperature changes little as the ratio of the oxidizer velocity to the fuel velocity is varied.

Citation

NIST Interagency/Internal Report (NISTIR) - 6839

Report Number

6839

NIST Pub Series

NIST Interagency/Internal Report (NISTIR)

Pub Type

NIST Pubs

Keywords

direct numerical simulation, flame structure, methane

Citation

Park, W. , Hamins, A. and McGrattan, K. (2011), Evaluation of a Two-Dimensional Simulation of Low Strain Rate Nonpremixed Counterflow Flames, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD (Accessed December 7, 2024)