B-6 Prediction of Swirling Turbulent Flow Using Different Turbulence Models

概要

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In the present study, the swirling turbulent flows in a double swirler burner are simulated, and the predictive ability of two turbulence models, e.g., the standard κ-ε model, the RNG κ-ε model, are studied by comparing the predicted results with the obtained experimental ones. The work can be briefly summarized as follows: 1. Both turbulence models reveal strongly swirling flow patterns, e.g. the existence of an large central toroidal recirculation zone(CTRZ) and an accompanying corner recirculation zone(CRZ). 2. For the flow conditions in this study, the calculations with the different models, however, predict different CTRZ sizes, mainly in the downstream of the burner. The prediction given by the standard κ-ε model shows comparatively good agreement with the experiment data, while the RNG κ-ε model is shown to overpredict the CTRZ sizes. 3. The comparison, on the other hand, shows that the RNG κ-ε model well predicts the characteristics of the forced motion in the swirling flow, while the standard κ-ε model fails to show this important physical feature in its prediction.
社団法人日本ガスタービン学会の論文
1996-10-15