3D Simulation on CO Diffusion in the Underground Powerhouse Construction

Ventilation is of important in the underground powerhouse construction. Under forced ventilation, the CO diffusion of construction was investigated using a 3D high Reynolds number k - epsiv model. The interfacial momentum transfers were considered. The wall roughness was considered in the wall function. Ventilation on the first layer of underground powerhouse of Xiangjiaba hydropower station was used as a case. It is concluded that the CO concentration decreases gradually with the increasing of the ventilation time. However, iso-concentration curves have the same tendency after 1200s. The CO concentration meets the ventilation and dust-prevention health standard after 1850s. It shows the u- velocity exhibited obvious difference adjacent to the heading face. The prediction by the present model is confirmed by the experimental measurement by Nakayama.