3D numerical simulation of construction ventilation effect for underground chamber group of Xiangjiaba Hydropower Station

The underground chamber group of Xiangjiaba Hydropower Station is characterized by complicated structures,large scale and difficulty in ventilation and smoke dissipation.For optimizing the ventilation plan to improve actual ventilation effect,we further studied the ventilation flow fields under different ventilation modes by 3D numerical simulation based on fluid mechanics theory,and quantitatively analyze the ventilation effects of several ventilation modes such as composite ventilation layout,serial arrangement,position selection of blowers and ventilation shaft.The simulation results show that the position of blowers directly influence the ventilation effect.It is suggested that the arrangement of negative-pressure blowers should be close to the fresh air source.The research results can provide the theoretic base and technical support for the ventilation design of similar projects.