Research On Tunnel Natural Wind Prediction Method And Ventilation Energy Saving Technology Based On Open Source Meteorologic Parameters

This thesis is aiming at solveing the problem of difficulty in building a ventilation and energy-saving system for highway tunnels caused by the lack of natural wind prediction methods.Basing on the Yanglin Tunnel,this thesis conducts a research about the optimization of natural wind ventilation.Theoretical analysis,field testing,software programming and other methods has been used to solve the problems of natural wind pressure in mountain tunnels,the prediction method of meteorological parameters outside the mountain tunnel,and the control method of fan in mountain tunnels are studied.The main results are as follows:1.Based on the engineering and meteorological characteristics of Yanglin tunnel,a set of natural wind calculation method for single shaft mountain tunnel is proposed.The correctness of the theory and calculation of this method is verified by theoretical derivation of ventilation and field test data.The meteorological station is established to collect and process the meteorological parameters at the entrance,and the natural wind distribution law in the two ventilation sections of Yanglin tunnel is obtained.2.The three-stage prediction method of tunnel natural wind based on open source meteorological parameters is proposed,including the real-time acquisition method of tunnel portal meteorological parameters based on open source data,the prediction method of next period meteorological parameters based on tunnel portal real-time data,and the determination method of tunnel natural wind based on tunnel portal predicted meteorological parameters.This method is used to predict the natural wind in the tunnel supporting the project,and the accuracy of the prediction model is verified.3.The ventilation energy-saving technology of Yanglin tunnel based on natural wind prediction is established.According to the natural wind prediction model of Yanglin tunnel,a ventilation energy-saving control mode based on the natural wind prediction method is proposed.The schemes of fan real-time control,hourly control,2-hour control,6-hour control and wind direction change process control are compared economically,and the optimal fan control scheme is obtained according to the wind direction change process control.The operation cost of the whole life cycle of the tunnel is analyzed by using the predicted meteorological data.Compared with the calculation results of the detailed rules for ventilation design of highway tunnel,the method proposed in this paper can save energy by 6.05%.The above research results can be used for the setting of the operation ventilation and energy saving system based on the project,and can also provide a certain reference for the acquisition of meteorological parameters of the same type of mountain tunnel and the construction of the feedforward ventilation system.