Research On The Aerodynamic Characteristics And The Aerodynamic Load Spectrum Of High Speed Railway Tunnel

High speed railway transportation is the development trend of passenger and freight transportation in the future,in recent years,China's high-speed railway has made considerable progress,mileage and construction technology are ahead of the rest of the world.With the improvement of high-speed railway network,the research on the aerodynamics of the tunnel has been attached importance to the domestic scholars and the relevant staff.On the one hand,it is necessary to ensure the safety and comfort of the passengers and the safety of the train body,on the other hand,we should focus on the standard cross section of high speed railway tunnel in different countries.The smooth operation of the two projects depends on the tunnel aerodynamic load spectrum,but,the research on the aerodynamic load spectrum in China is still blank.In this paper,Fluent software was used to establish the three-dimensional model,and the numerical simulation of the tunnel aerodynamics was studied.The main contents and conclusions are as follows:(1)The control equations,mathematical models,boundary conditions and calculation methods used in the numerical simulation of the tunnel aerodynamics were summarized.And it was summarized that the basic laws of the air pressure change inside the high speed railway tunnel according to the theoretical literature and the related results of the site and model test.(2)The tunnel pressure comfort standards in Britain,Germany and japan were studied in this paper,and the standard of pressure comfort for high speed railway tunnel in China was summarized.Then the numerical simulation of the pressure comfort of high speed railway tunnel in China was carried out.The results show that,in the current situation of construction.(3)The calculation method and propagation law of micro pressure wave caused by high speed railway trains were summarized.And the effects of the tunnel length,the train operating speed and the tunnel blockage on the micro pressure wave in the entrance were studied.The results show that the micro pressure wave is not affected by the tunnel length.But there is linear relationship between the peak of micro pressure wave and the cubic of the speed,And power relation between the peak of micro pressure wave and the tunnel blockage ratio.(4)This paper studied the influence of tunnel length,train speed and tunnel blockage on the aerodynamic load of tunnel.The results show that:1000m is the most unfavorable tunnel length,There is linear relationship between the aerodynamic load and the square of the speed,and power relationship between the aerodynamic load and tunnel blockage ratio.(5)The aerodynamic load spectrum of tunnel was put forward based on the aerodynamic load spectrum of Deutsche Bahn.The results of this paper complemented the database of the numerical simulation of aerodynamics in China,and supplemented the blank of the research on the aerodynamic load spectrum of high speed railway tunnel in China.It is of great significance for the improvement of high speed railway network in China and the selection of the standard section of railway tunnel in different countries.