Optimization of construction ventilation scheme for large-scale underground cavern group of Xiangjiaba hydropower station based on numerical simulation

The ventilation of Xiangjiaba underground powerhouse is very difficult, and the traditional ventilation design maybe result in poor effect and resource waste. In order to resolve these problems, the optimization model of ventilation scheme was proposed based on dynamic simulation and numerical simulation. By this model, the variability and the dynamic characteristic of needed wind quantity can be considered and the flow field can be simulated. The results showed that this method can provide the theoretic proof and technical support for the ventilation design.