Effect of Rotational Speed on the Stability of Two Rotating Side-by-side Circular Cylinders at Low Reynolds Number

查看全文 作　　者：DOU [1]Huashu;ZHANG [1]Shuo;YANG [1]Hui;SETOGUCHI [2]Toshiaki;KINOUE [2]Yoichi

机构地区：[1]Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University;[2]Department of Mechanical Engineering, Saga University

出　　处：《Journal of Thermal Science》索引2018年第27卷第2期,共10页

基　　金：supported by National Natural Science Foundation of China(51579224);Zhejiang Province Key Science and Technology Innovation Team Project(2013TD18);Zhejiang Province Science and Technology Plan Project(2017C34007) 摘　　要：Flow around two rotating side-by-side circular cylinders of equal diameter D is numerically studied at the Reynolds number 40≤ Re ≤200 and various rotation rate θ_i. The incoming flow is assumed to be two-dimensional laminar flow. The governing equations are the incompressible Navier-Stokes equations and solved by the finite volume method(FVM). The ratio of the center-to-center spacing to the cylinder diameter is T/D=2. The objective of the present work is to investigate the effect of rotational speed and Reynolds number on the stability of the flow.The simulation results are compared with the experimental data and a good agreement is achieved. The stability of the flow is analyzed by using the energy gradient theory, which produces the energy gradient function K to identify the region where the flow is the most prone to be destabilized and the degree of the destabilization. Numerical results reveal that K is the most significant at the separated shear layers of the cylinder pair. With Re increases,the length of the wake is shorter and the vortex shedding generally exhibits a symmetrical distribution forθ_i<θ_(crit), It is also shown that the unsteady vortex shedding can be suppressed by rotating the cylinders in the counter-rotating mode. 关键词：旋转速度稳定性柱体圆形有限体积方法不可压缩流动数字地

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Effect of Rotational Speed on the Stability of Two Rotating Side-by-side Circular Cylinders at Low Reynolds Number

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