COMPARISON OF TWO-EQUATION TURBULENCE MODELS IN SIMULATION OF A NON-SWIRL COAL FLAME IN A PILOT-SCALE FURNACE

摘要

The capability of six two-equation Reynolds-averaged Navier-Stokes (RANS) models for simulation of a non-swirl coal flame in a pilot-scale furnace has been investigated. These turbulence models-the standard k-ε model, re-normalization group (RNG) k-ε model, modified k-ε model, Wilcox k-ω model, Menter k-ω model (also called BSL model), and Shear-stress transport (SST) model-are assessed with the use of measured gas phase velocity, temperature, oxygen, and carbon dioxide volume fraction data from the literature. Predictions of the standard k-ε model, RNG k-ε model, BSL, and SST model are generally in good agreement with the experimental data. The Wilcox k-ω model generally overpre-dicts O_2 volume fraction and underpredicts CO_2 volume fraction. The modified V-z model yields results that have large discrepancies from measurements.