Distribution characteristics of the flow around four flat plates in staggered at different arrangements

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Guo, P.M.^1 ; Gao, B.^1 ; Gou, W.B.^1

School of Energy and Power Engineering, Jiangsu University, Zhenjiang

212013, China^1

关键词: Distribution characteristics;    Inhibitory effect;    Mean velocity distribution;    Minimum velocities;    Reverse flow region;    Tandem configuration;    Three-dimensional characteristics;    Three-dimensional turbulent flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012029/pdf
DOI  :  10.1088/1755-1315/163/1/012029

来源: IOP

【 摘 要 】

The three-dimensional turbulent flow around plate cascades in staggered is an important factor to induce hydro-mechanical vibration. Taking the upstream three plates in side-by-side configuration and the downstream single plate in tandem configuration to form the overall staggered layout of the cascades as the subject of investigation. Based on the Large-Eddy-Simulations (LES), the forces experienced by the plates, velocity distributions and three-dimensional vortex structures around the plates are analysed in detail. Some experiments were also carried out to validate the accuracy of the numerical results by LDA measurement. The mean velocity distributions from LES results agree fairly well with the experimental results. Results show that the existence of the downstream plate hinders the development of the upstream wake and has a significant inhibitory effect on the forces experienced by the upstream plates; When the gap spacing is smaller, the stream-wise length of the reverse flow region between the upstream and downstream plate becomes larger, and the minimum velocity in this region is lower than other reverse flow regions; The flow around the plate cascades exhibits high three-dimensional characteristics, and the amplitude of the fluctuation of the forces on the downstream plate under the interference of the upstream wakes is increased obviously. The downstream plate is located in the wake of the upstream cascade, and has a steady flow to the upstream wake. Analysis on the flow can provide theoretical support for the flow control in hydraulic machinery.