Study on influence of thermal potential difference on propagation characteristics of hot air at tunnel face
In order to solve the problem of thermal damage caused by hot air to the operators in the deep buried high-speed railway tunnel,according to the law of conservation of energy,a theoretical model for the temperature of the front of hot air propagating in the tunnel changed with distance was derived,and the CFD software was used to simulate the air temperature change along the deep buried high-speed railway tunnel under different working conditions.The results show that when there is no ventilation,the temperature change of the propagating front of hot air presents 2 distinct phases:T>297 K,extremely fast descent phase,T<297 K,gradual stabling phase.The timely ventilation can quickly reduce the tunnel temperature,and it is recommended that both the outlet of the side duct of the large and small mileage are 45 m from the tunnel face,and the ventilation wind speed is 20 and 15 m/s,respectively.The research results can provide reference for further optimization of ventilation and cooling in high-speed railway tunnel construction.
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