Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets,Chemical Engineering & Technology

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Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2022-01-20 , DOI: 10.1002/ceat.202100422
Zhongren Ba _{1,

2} , Zhenhua Hao ₁ , Junguo Li ₃ , Xin Yang ₄ , Jiazhou Li ₅ , Jiantao Zhao ₁ , Yitian Fang ₁

Affiliation

Contraction and premix coaxial jets are commonly employed in gasification and combustion systems. Understanding the spatial development of coherent structures is a prerequisite to improve the mixing and stability characteristics. The evolution and dynamics of coherent vortices under the contraction and premix coaxial jets are visualized and discussed using flow visualization technology. The contraction configuration increases the instability of the outer shear layer corresponding to an organized rolling up of the outer vortex rings. In the premixed configuration, the earlier interaction between the inner and outer shear layers induces the precocious development of the inner Kelvin-Helmholtz (K-H) vortices. Two empirical equations are proposed to predict the transition length towards a fully turbulent flow.

中文翻译：

收缩和预混同轴射流中相干涡流的演变和动力学

收缩和预混同轴射流通常用于气化和燃烧系统。了解连贯结构的空间发展是改善混合和稳定性特性的先决条件。使用流动可视化技术可视化和讨论收缩和预混同轴射流下相干涡流的演变和动力学。收缩配置增加了外剪切层的不稳定性，对应于外涡环的有组织的卷起。在预混合配置中，内部和外部剪切层之间的早期相互作用导致内部开尔文-亥姆霍兹 (KH) 涡流的早熟发展。提出了两个经验方程来预测完全湍流的过渡长度。

更新日期：2022-01-20

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