A Study On Numerical Simulation And Model Experiment Of The Pressure Waves Of The High-Speed Trains Through Tunnels

Based on the analogy between the wave height for the free-surface flow and the pressure of compressible flow movement, shallow water simulation experimental equipment that was used to simulate the tunnel pressure wave of high-speed railway firstly was built in China, and the simulation experiment of tunnel pressure wave was carried. Experimental results show that the shallow water simulation experimental method and equipment are successful and the result can be used to check the numerical calculation of pressure wave with complex geometry structure tunnel.As the structure form of this immersed tunnel is made of special form pipes, there are not the flowing resistance data of the structure tunnel to be used. In the thesis author has firstly simulated the resistance coefficients of trains passing the immersed tunnel and has gotten a number of experimental data on pressure loss coefficient. These data is very valuable to study of tunnel pressure wave and design of tunnel ventilation.Combining the trait of the proposed Nanjing Yangtze River immersed tunnel, Author has developed the numerical procedure of the single-train pressure waves and train crossing pressure waves with complex geometry structure tunnel. Using the above experimental data Author checked the validity of the procedure. Because the results of the numerical calculation are good agreement with the simulation experimental oae, the numerical procedure can be used to predict the pressure wave with complex geometry structure tunnel. The procedure has been investigated the pressure waves under the kinds of conditions. The results are helpful for the selection of the immersed tunnel tentative programmes.One dimensional unsteady compressible non-homentropic flow prediction method and procedure for calculating pressure waves generated by high-speed trains passing though a single bore tunnel are perfected in this thesis. Under the condition of the tilting and quasi-high-speed trains sharing the same line, the single-train pressure waves and train crossing pressure waves were firstly investigated in China. With the help of a number of numerical calculations the suggestion of controlling the running speed and retarding measures on pressure waves were gotten.By analyzing the forming mechanism and feature of tunnel pressure wave andmicro-pressure wave, in the thesis it is realized that essential feature of tunnel pressure wave and micro-pressure wave are infrasound and a new detection method that is used to evaluate the impact of high-speed trains aerodynamics to environment is set forth. The new test equipment that is used to detect the impact of high-speed train to environment is manufactured.