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Large eddy simulation of mixing process for different density gas jets |
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute for Energy Research, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The large eddy simulation of the turbulent mixing process for different density gases in the case of circular tube jet was carried out to investigate the effect of gas density ratio on the downstream gas mixing process. The results show that with helium and carbon dioxide injecting into air, the Reynolds numbers are 7 000 and 32 000, respectively. The calculated results of velocity and mass fraction are in good agreement with the experimental results. For the same jet flow flux, the low-density jets are developed faster than high-density jets. The pseudo-similarity of the variable-density jet is verified, and the coherent vortex structure is analyzed. The turbulent flow fields of carbon dioxide jets at different jet velocities are calculated to show that the low velocity jet has higher mixing rate than the high velocity jet.
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Received: 08 November 2018
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