Numerical Simulation Of The Using Of Thermal Potential Difference In Operating Ventilation Of Highway Tunnel With Shaft

High temperature problem is very common in the deep-buried highway tunnel which caused the thermal potential difference has great influence in the tunnel ventilation. The inadequate research of tunnel thermal potential difference will cause the unreasonable tunnel ventilation design, and these problems will lead to serious energy consumption and insufficient ventilation in the tunnel operation process. Therefore, in order to correctly understand the thermal potential role in the tunnel operation process to effectively utilize the thermal potential difference, it is necessary to study the change law of the thermal potential difference for the optimization of the ventilation scheme, to optimize the ventilation scheme to achieve the saving energy and reducing consumption purpose. On the basis of summarizing the existing research both at home and abroad, the paper utilizes the numerical simulation to research some problems of the operation ventilation in the highway tunnel, the main research work as follows:1. The paper introduced some fluid mechanics governing equations in the numerical simulation of the tunnel ventilation, it analyzed three kinds of basic turbulence models in the Fluent, and selected the standard k-ε epsilon model. The energy equation should be open in the process of heat transfer. It validated the feasibility of the numerical simulation by the calculation of the thermal potential difference.2. The paper studied the influence of the thermal potential difference and axial flow fan in the concentration of the exhaust(supply) of the highway tunnel with a shaft, and analyzed the influence of the environmental temperature on the air temperature, density and the flow state. It was put forward to central exhaust in winter or to central supply in summer.3. It analyzed the law of the thermal potential difference in the exhausting and blowing longitudinal ventilation system, and it put forward a optimization scheme of ventilation: in the winter, the amount of opening jet fan in supply section should be increased, and the number of opening jet fan in exhaust section should be reduced.4. The paper studied the using of the thermal potential difference in the exhausting and blowing ventilation of the highway tunnel with two shafts. The regular of exhausting and blowing ventilation in one-way tunnel with two shafts is similar to the regular exhausting and blowing ventilation, in the combination of two one-way tunnels with a shaft. And the same regular of exhausting and blowing ventilation is applied to one-way tunnel with three shafts.