近尾迹中平板对钝物体的干扰

摘要

In order to minimize the fluctuating force levels of a bluff body for the purpose of reducing structure vibration and radiated sound, the finite volume method (FVM) was used to calculate the hydrodynamic performance of a bluff body of different section shapes in a uniform fluid stream. The laminar model and standard turbulence model were used to solve the Navier-Stokes equations for different Reynolds numbers. A thin flat plate was placed in the near wake of the bluff body to reduce the fluctuating force and frequency of vortex shedding on the upstream bluff body. The best plate station to significantly reduce the fluctuating force and fundamental Strouhal number was found. Furthermore, numerical calculations showed that the drag coefficients and lift coefficients of the plate and upstream bluff body deercased with the increase of the plate length.%为了减小作用在钝物体上的交变力进而有效地降低结构振动和噪声,以有限体积法分别采用层流模型、标准k-ε湍流模型,计算了不同Re数和截面形状的钝物体的流体动力性能;并通过在钝物体近尾迹区域水平布置一平板,降低上游钝物体尾涡脱落频率和作用在钝物体上周期性交变力.研究发现存在最优的平板布置位置,可以最大程度地降低作用在钝物体上的周期性交变力以及斯特罗哈数.同时,随着平板尺度的增加,钝物体和平板的升力系数、阻力系数也都随之减小.