Session: FSI-02-03 Vortex Shedding

Paper Number: 123101

123101 - Study on Vortex Shedding Characteristics of Concentric Circular Rod Bundle Arrangements 

This study aims to comprehensively investigate the vortex shedding characteristics of concentrically arranged tube bundles under different configurations (pseudo-triangular, pseudo-square, and transitional layouts) and varying diameter ratios (1.25, 1.5, 1.75, and 2.0). The research findings demonstrate that, firstly, with an increase in diameter ratio, the phenomenon of vortex shedding within the tube bundle gradually becomes apparent. At a diameter ratio of 1.25, the vortex shedding phenomenon is relatively mild. However, as the diameter ratio increases to 2.0, the vortex shedding phenomenon significantly intensifies. This emphasizes a direct influence of the tube bundle's diameter ratio on vortex shedding, where a larger diameter ratio leads to a more pronounced vortex shedding phenomenon.
Furthermore, different layout configurations exhibit varying effects on vortex shedding. The pseudo-triangular arrangement is notably affected by vortex shedding, resulting in a more pronounced phenomenon. In contrast, the transitional arrangement experiences minimal influence, resulting in a relatively mild vortex shedding. This could be attributed to the pseudo-triangular arrangement generating more disturbances in fluid flow, thereby increasing the likelihood of vortex shedding.
Lastly, calculations and analyses of the Strouhal numbers for different layout configurations were conducted at varying diameter ratios. These calculations serve as crucial references for verifying vortex shedding frequencies, and the results indicate a particular need to focus on the pseudo-triangular arrangement. Calculating the Strouhal numbers contributes to a deeper understanding of the characteristics and patterns of vortex shedding within the tube bundle, laying the foundation and providing guidance for future research and engineering applications.

Presenting Author: Guorui Zhu Tianjin University

Presenting Author Biography: Associate professor in Tianjin University, focus on flow-induced vibration and fretting wear.

Authors:

Zhengfeng Huang State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment，China Nuclear Power Engineering Co., Ltd.
Heng Wang Zhejiang Institute of Tianjin University
Hong Lv State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd
Guorui Zhu Tianjin University