离岸式振荡水柱气室参数CFD优化设计

CFD Analysis and Optimization of Air Chamber Parameters for Offshore Oscillating Water Column Design

采用计算流体动力学分析(CFD)技术研究离岸式振荡水柱波能转换装置的设计参数优化问题。首先,借助FLUENT软件用户自定义函数功能(UDF)并运用动边界造波及多孔介质消波方法建立基于线性波浪理论的二维数值波浪水槽,然后,将水槽的分析方法应用于振荡水柱气室仿真研究。结果表明:离岸式振荡水柱气室在发生共振时转换效率最高,气室内液面升降幅度随着波能转换装置的前墙入水深度、厚度以及气室宽度的减小而产生较明显的增大;相对于前墙尺寸,气室宽度对波能转换装置的能量转换功率影响较大。

The computational fluid dynamics（CFD） technique is introduced to optimize the design parameters of offshore oscillating water column for harvesting wave energy. The two-dimensional（2D） numerical wave tank model based on linear wave theory is established with the user defined function（UDF） of the FLUENT software and the method that combines dynamic boundary wave making techniques with porous media wave absorbing theory. The analysis method of the tank is also adopted to simulate the air chamber of oscillating water column.Based on the simulation results, the maximum conversion efficiency occurs at oscillating water column resonance in the air chamber. The liquid level in the chamber will significantly rise with the reduction of the draught depth and thickness of the front wall and especially with the width of the air chamber. Relative to the size of the front wall, the air chamber width contributes more to the energy conversion efficiency of the wave power device.