Analysis of buoyancy-driven natural ventilation effect in integrated compartment of underground utility tunnels

 Aiming at the design of buoyancy-driven natural ventilation for the integrated compartment of the underground utility tunnel, a numerical model is established based on the integrated compartment of the Wushan utility tunnel, and the effects of the height difference of air inlet and exhaust outlet and the heat dissipation of cables in the cabin on the profile velocity and temperature distribution at different positions in the utility tunnel are simulated and analysed. The height difference of air inlet and exhaust outlet, the intensity of heat source in the cabin, the pipeline layout and the size of the exhaust outlet are optimized and explored. The results show that the reasonable natural ventilation design can effectively remove the heat in the integrated cabin and meet the normal ventilation requirements.