Ventilation ducts with a high cross-sectional area are frequently built as structural that include inside transversal beams. In this way, the requested is respected, but transverse elements will have big impact on airflow, eventually additional noise and vibration amount of energy wasted across From perspective, aim study to evaluate beams ventilation ducts, analyze different alternatives for a...

In tunnel construction, the difficulty of ventilation gradually increases with increase distance, which endangers construction safety and delays progress. This paper presents an air cabin system during construction. Theoretical calculations show that energy consumption this is reduced by 20.7% compared blowing ventilation, especially since resistance loss along duct 47.04%. A 3D numerical model...

In order to investigate the effect of environmental wind on a tunnel with one blocked end fire under natural ventilation, series numerical simulations were conducted using large eddy simulation method in this study. The model is established by software FDS, and 36 groups working conditions such as speed 0-5m / s angle 45-135 are simulated. Combined results smoke spread, temperature velocity vec...

We investigate the ventilation conditions required to control propagation of smoke, produced by a tunnel fire, in presence two inertial forcings: transverse extraction system and longitudinal flow. For that purpose, we performed series experiments reduced-scale tunnel, using mixture air helium simulate release hot smoke during fire. Experiments were designed focus on flows allow buoyant be conf...