Hydrodynamic characteristics analysis of underwater compressed gas combined airbag energy storage device

At present, the efficient utilization of renewable energy is a research hotspot worldwide, with the continuous expansion of the development scale of offshore wind energy, wave energy, solar energy and other new energy sources. However, such renewable energy sources have characteristics such as strong randomness and intermittency, making it difficult to meet people's real-time energy demand. Energy storage technology is one of the effective ways to solve this problem. Focusing on the energy storage challenge of offshore renewable energy and leveraging the core advantages of underwater compressed air energy storage technology (high efficiency and environmental friendliness), this paper designs an underwater compressed air energy storage device with multi-flexible airbag combination. The core research objective is the hydrodynamic characteristics of the external flow around the device. Through theoretical analysis and verification, the SST k-ω model is selected for numerical simulation of the device's flow field. The flow field characteristics and hydrodynamic parameters under variations in the angle between the device and the water flow direction, flow field velocity, and gas storage airbag volume state are systematically studied. To verify the reliability of the simulation results, a hydrodynamic characteristic verification experiment of the scale model is designed. The relative errors between the experimental data and simulation results are all within 15%, confirming the correctness of the numerical simulation analysis.