Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets

Ba, Zhongren1,2; Hao, Zhenhua1; Li, Junguo3; Yang, Xin4; Li, Jiazhou5; Zhao, Jiantao1; Fang, Yitian1

2022-02-01

10.1002/ceat.202100422

CHEMICAL ENGINEERING & TECHNOLOGY   影响因子和分区

0930-7516

1521-4125

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.

Coaxial jets Coherent structures Flow visualization Nozzle configuration Vortex rings

SCI ; EI

英语

其他

Major Special Projects of Science and Technology in Shanxi Province[20201102006] ; Key Research and Development Program of Shanxi Province[201903D121018] ; National Key Research and Development Program of China[2018YFC0808500]

Engineering

Engineering, Chemical

WOS:000749614400001

WILEY-V C H VERLAG GMBH

20220611596894

Vortex flow

Fluid Flow, General:631.1

CHEMISTRY

Web of Science

1.Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100039, Peoples R China
3.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
4.Univ Oxford, Dept Engn Sci, Oxford OX2 0ES, England
5.China Univ Petr, Coll Chem Engn, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

Ba, Zhongren,Hao, Zhenhua,Li, Junguo,et al. Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets[J]. CHEMICAL ENGINEERING & TECHNOLOGY,2022,45:601-609.

Ba, Zhongren.,Hao, Zhenhua.,Li, Junguo.,Yang, Xin.,Li, Jiazhou.,...&Fang, Yitian.(2022).Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets.CHEMICAL ENGINEERING & TECHNOLOGY,45,601-609.

Ba, Zhongren,et al."Evolution and Dynamics of the Coherent Vortices in Contraction and Premix Coaxial Jets".CHEMICAL ENGINEERING & TECHNOLOGY 45(2022):601-609.