水下压缩空气储能系统储气装置的CFD数值模拟

针对水下储气装置在复杂的海洋环境中容易受到海流的影响从而引发结构失效等问题,采用大涡模拟方法,对不同海流条件下的水下储气装置流体动力学特性进行了数值模拟。首先对比分析了不同流速工况下海水绕流后的时均速度场;其次通过监测在0.5 m/s流速工况下旋涡的发展及脱落过程以研究尾迹流场的瞬态变化情况;最后分析了在不同工况下装置的受力特性。结果表明,装置在低流速海洋环境下的绕流影响区更广;装置的阻力与升力系数分别为0.45和0.6;侧向形成的三维旋涡的脱落周期约为100 s,会对装置造成低频扰动。结果较为清楚地描述了水下储气装置在复杂海洋环境中的基本水动力特征,为储气装置的设计优化提供了一定的理论依据。

Numerical Simulation of Air Storage Container in Underwater Compressed Air Storage System

In order to solve the problem that the underwater air storage container is easily affected by the current in the complex marine environment, which leads to structural failure. The large eddy simulation method is used to simulate the hydrodynamic characteristics of the underwater air storage container under different current conditions. Firstly, the time average velocity field of seawater flow around the wake is compared and analyzed under different velocity conditions. Secondly, the transient change of wake flow field is studied by monitoring the development and shedding process of vortex under the velocity condition of 0.5 m/s. Finally, the mechanical characteristics of the container under different conditions are analyzed. The analysis results show that the influence area of flow around the container is wider in the low velocity marine environment. The drag and lift coefficients of the container are 0.45 and 0.6, respectively. The shedding period of the three-dimensional vortex formed laterally is about 100 s, which will cause low-frequency disturbance to the container. The obtained results clearly describe the basic hydrodynamic characteristics of the underwater air storage container in the complex marine environment, and provide a theoretical basis for the design and optimization.