The Parametric Study Of The Explosive Pressure Wave Influential Factor About High-speed Train Passing Through The Tune

In this thesis, based on two dimensional axisymmetric Euler equations, the explosive pressure wave is studied synthetically from theory、numerical calculation and experiment.Theoretical research includes the study of the explosive pressure on the formation mechanism and the study of explosive pressure wave on theoretical calculation. In view of the near field strongly nonlinear characteristics of the tunnel outlet explosive pressure wave, while the existing numerical calculation accuracy remains to be improved, according to the nonperturbation boundary hypothesis, the new spectral difference method numerically simulates the explosive pressure wave which is generated by high-speed train passing through the tunnel, and the numerical results are compared with the experimental results.On this basis, the paper proceeds the following numerical study of the explosive pressure wave:the study of the explosive pressure wave on the space distance; the study of the explosive pressure wave on the space angle; the study of the explosive pressure wave on the pressure wave gradient; the study of the explosive pressure wave on the barrier height; the study of the explosive pressure wave on the direction; the study of the explosive pressure wave on the waveform changes..The main conclutions are as follow.(?) For the350km/h speed stage, the explosive pressure wave is proportional to tunnel axial distance r to the power of-0.83.(?) When the monitoring points are in the range of [0.3d,0.6d],the γ of the formula2-6is in the range of [0.75,1.02].(?) The barrier height,which is more than3.5times the diameter of the exit of the tunnel, did not affect the explosive pressure wave of the tunnel exit axis20meters t.(?) For the sound of the tunnel exit structure, the sound pressure value is decreasing as the azimuth angle increases, and the increases trend slows down gradually with the increase of azimuth angle.In the [10°30°] and [40°70°], the sound pressure shows a linear relationship with azimuth angle, but in the [0°90°], the sound pressure shows not certain functional relationship with azimuth angle.