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Numerical and experimental investigation of flow around a balloon-shaped bluff body

机译：气球状钝体绕流的数值和实验研究

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摘要

Air accumulator is a critical component in Underwater Compressed Air Energy Storage systems and Buoyancy Energy Storage systems. In order to bridge the gap between the CFD simulations and experiment verification of flow around air accumulator, in this study, the force characteristics and flow structures around a balloon-shaped air accumulator bluff body model have been investigated using a computational-experimental dual prong method for the first time. The three-dimensional Unsteady Reynolds Averaged Navier-Stokes (URANS) closure is achieved through the k-omega SST turbulence model in FLUENT. The force characteristics and flow structures are measured in a low-speed closed-loop wind tunnel to verify the simulation results. The free end and shape effects are investigated by comparing the flow structure of three different but interconnected bluff bodies at the equivalent Reynolds number of 7.0 x 10(4). The results show that the k-omega SST turbulence model can correctly predict the time-averaged force characteristics of the balloon-shaped bluff body and flow structures in the wake. Besides, the distinct vortex structures are induced due to the free end and tapered shape effects.
机译：空气蓄能器是水下压缩空气储能系统和浮力储能系统的关键组件。为了弥合CFD模拟和空气蓄热器周围流动的实验验证之间的差距，在这项研究中，使用计算实验双叉方法研究了气球状空气蓄能器钝体模型周围的力特性和流动结构。首次。通过FLUENT中的k-omega SST湍流模型实现了三维非稳态雷诺平均Navier-Stokes（URANS）闭合。在低速闭环风洞中测量了力的特性和流动结构，以验证模拟结果。通过比较等效雷诺数为7.0 x 10（4）的三个不同但相互连接的钝体的流动结构，研究了自由端和形状效应。结果表明，k-omega SST湍流模型可以正确预测尾流中气球状钝体和流动结构的时均力特性。此外，由于自由端和锥形效应，产生了独特的涡旋结构。

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