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Numerical Investigation of Turbulence Models for Swirling Nitrogen/Air
In this paper, different turbulence models are researched by simulating a non-reactive swirl flow of the non-premixed cyclone burner in comparison with the experimental results. Based on the velocity analyses, obvious recirculation zone (CRZ) and jet zone (SJ) exist in the experiments and influences the swirl flow. However, the laminar flow model, SST k-w, standard k-w cannot simulate these two vital regions as same accurate as the RNG model, especially for the declination angles. Comparing the axial velocity curve and tangential velocity curve, axial velocity and tangential velocity peaks and trough position and velocity magnitude of the RNG k-ε model are the closest to the experimental results, which can fully predict the swirl characteristics. The structure of the vortex is fully represented by RNG model, and the CRZ and SJ at the burner outlet are well captured. Thus, the RNG model is most suitable for the swirl flows. Based on the simulation results of the RNG model, the CRZ and SJ are folded, corrugated, and have completely asymmetrical behavior due to Kelvin-Helmholtz instability. It may cause the turbulence models without swirl corrections to be unable to simulate the important swirl flow characteristics correctly, while the RNG model has considered the swirl influence in the turbulence viscosity correction. Therefore, a suitable swirl flow correction considering the swirl number is important in turbulence models for such simulations.
Numerical Investigation of Turbulence Models for Swirling Nitrogen/Air
In this paper, different turbulence models are researched by simulating a non-reactive swirl flow of the non-premixed cyclone burner in comparison with the experimental results. Based on the velocity analyses, obvious recirculation zone (CRZ) and jet zone (SJ) exist in the experiments and influences the swirl flow. However, the laminar flow model, SST k-w, standard k-w cannot simulate these two vital regions as same accurate as the RNG model, especially for the declination angles. Comparing the axial velocity curve and tangential velocity curve, axial velocity and tangential velocity peaks and trough position and velocity magnitude of the RNG k-ε model are the closest to the experimental results, which can fully predict the swirl characteristics. The structure of the vortex is fully represented by RNG model, and the CRZ and SJ at the burner outlet are well captured. Thus, the RNG model is most suitable for the swirl flows. Based on the simulation results of the RNG model, the CRZ and SJ are folded, corrugated, and have completely asymmetrical behavior due to Kelvin-Helmholtz instability. It may cause the turbulence models without swirl corrections to be unable to simulate the important swirl flow characteristics correctly, while the RNG model has considered the swirl influence in the turbulence viscosity correction. Therefore, a suitable swirl flow correction considering the swirl number is important in turbulence models for such simulations.
Numerical Investigation of Turbulence Models for Swirling Nitrogen/Air
Lecture Notes in Civil Engineering
Weng, Chih-Huang (Herausgeber:in) / Ding, Aoshuang (Autor:in) / Wang, Nenghui (Autor:in) / Yang, Zaixing (Autor:in) / Mei, Wenqing (Autor:in) / Chen, Lin (Autor:in) / Xiao, Congyang (Autor:in) / Wu, Hai (Autor:in) / Yi, Siyang (Autor:in)
International Conference on Advances in Civil and Ecological Engineering Research ; 2023 ; Macau, China
31.08.2023
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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