基于IDDES方法的受限撞击流反应器流动及混合特性

doi:10.7523/j.ucas.2022.050

摘要/Abstract

摘要： 采用基于SSTk-ω模型的IDDES方法对 CIJR内部的流动及混合过程进行数值模拟研究，较完整地识别了流场不同区域的大尺度涡结构，探讨了涡结构的生成和演化机制。讨论涡结构对相平均温度场和热通量场的影响，揭示了混合机理。研究结果表明：2股射流向圆顶区的交替偏转导致动量不相等，射流剪切层的自持振荡伴随涡旋的周期性运动，因此驻点出现周期性偏移现象。下游发展区K-H不稳定性的发展卷起大尺度展向涡。撞击区的流向涡对混合的促进作用局限在腔室轴线附近，下游发展区的展向涡能够激发大规模的热量输运，从而有效强化混合。

关键词: 撞击流反应器, IDDES方法, 涡结构, 流动特征, 混合特性

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

中图分类号:

TQ021.1

金琳娜, 曹玉会. 基于IDDES方法的受限撞击流反应器流动及混合特性[J]. 中国科学院大学学报, 2024, 41(2): 165-175.

JIN Linna, CAO Yuhui. IDDES simulation of flow and mixing characteristics in a confined impinging jet reactor[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(2): 165-175.

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