Flow and mixing characteristics of granular jet exposed to central and annular air jet

doi:10.11949/j.issn.0438-1157.20150088

CIESC Journal ›› 2015, Vol. 66 ›› Issue (7): 2411-2419.DOI: 10.11949/j.issn.0438-1157.20150088

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Flow and mixing characteristics of granular jet exposed to central and annular air jet

LÜ Hui¹, WANG Haiyong¹, LI Dalong¹, CAO Guiping¹, LIU Haifeng², GUO Yanglong³

1 State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;
3 Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China

Received:2015-01-20 Revised:2015-04-22 Online:2015-07-05 Published:2015-07-05
Supported by:
supported by the China Postdoctoral Science Foundation (2014M551347).

中心气流与环形气流作用下颗粒射流的流动与混合特性

吕慧¹, 王海永¹, 李大龙¹, 曹贵平¹, 刘海峰², 郭杨龙³

1 华东理工大学化学工程联合国家重点实验室, 上海 200237;
2 华东理工大学煤气化与能源化工教育部重点实验室, 上海 200237;
3 华东理工大学工业催化研究所, 上海 200237

通讯作者: 曹贵平
基金资助:
中国博士后科学基金项目(2014M551347)。

Abstract

Abstract:

An experimental study was conducted on gas-particle coaxial jets by PIV and high-speed camera. The effects of the coaxial jets form and the addition of swirl on the flow and mixing characteristics of particle phase were investigated. The results showed that the axial velocity of the granular jet exposed to an annular air jet was higher than that of the granular jet with a central air jet. In addition, the mixing effect of the case with an annular air jet was found to be much better. For the two coaxial jets forms, the particle axial velocity profile in the cross-section close to the nozzle was more even. The addition of swirl, especially for the strong swirl, could not only achieve the uniform distribution of the particle axial velocity in the far field, but also improve the mixing effect of the two-phase efficiently.

Key words: two-phase flow, coaxial jets, swirling jet, particle velocity profile, mixing, flow

摘要：

采用PIV测速系统和高速摄像仪对同轴气固两相射流进行了实验研究,着重考察了同轴射流结构和旋流对颗粒流动与混合特性的影响。结果表明,环形气流作用下颗粒获得的轴向速度比相同条件下中心气流作用下的颗粒轴向速度大,且气固两相的混合效果更佳,在这两种同轴射流结构下,颗粒的轴向速度仅在靠近喷嘴的横截面上分布较为均匀。而旋流,特别是强旋的引入不仅可以促进远场区颗粒速度的均布,而且能够有效地改善两相混合效果。

关键词: 两相流, 同轴射流, 旋转射流, 颗粒速度分布, 混合, 流动

CLC Number:

TQ021.1

LÜ Hui, WANG Haiyong, LI Dalong, CAO Guiping, LIU Haifeng, GUO Yanglong. Flow and mixing characteristics of granular jet exposed to central and annular air jet[J]. CIESC Journal, 2015, 66(7): 2411-2419.

吕慧, 王海永, 李大龙, 曹贵平, 刘海峰, 郭杨龙. 中心气流与环形气流作用下颗粒射流的流动与混合特性[J]. 化工学报, 2015, 66(7): 2411-2419.

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Flow and mixing characteristics of granular jet exposed to central and annular air jet

中心气流与环形气流作用下颗粒射流的流动与混合特性

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