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Journal of University of Chinese Academy of Sciences ›› 2024, Vol. 41 ›› Issue (2): 165-175.DOI: 10.7523/j.ucas.2022.050

• Research Articles • Previous Articles     Next Articles

IDDES simulation of flow and mixing characteristics in a confined impinging jet reactor

JIN Linna, CAO Yuhui   

  1. College of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-03-28 Revised:2022-05-05 Online:2024-03-15

Abstract: There exist various vortical structures in the turbulent flow field of confined impinging jet reactors, which have important effects on the flow characteristic and mixing performance. A numerical study was conducted on the flow field of a confined impinging jet reactor using the IDDES method based on SST k-ω turbulent model. Various large-scale vortical structures were identified, and their generation and evolution mechanisms were discussed. The effects of vortices on the phase-averaged temperature and heat flux fields were discussed to reveal the mixing mechanism. Results indicated that the alternating deflection of two jets leaded to unequal momentum between them, and the self-sustained oscillation of two jet shear layers caused the periodic motion of vortices, hence the stagnation point deviated from the mid-point periodically. Large-scale spanwise vortices were generated in the downstream region due to the development of K-H instability. The streamwise vortices in the impinging region only enhanced the thermal mixing near the channel axis, while the spanwise vortices could stimulate a large-scale heat transport and turbulent mixing in the downstream region.

Key words: impinging jet reactors, IDDES, vortical structure, flow characteristics, mixing characteristics

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