Abstract A tunnel with a perforated wall is a new type of high-speed railway tunnel structure, and the aerodynam? ics induced by the passing of a high-speed train through the tunnel will differ from those of traditional tunnel. In this paper, the effects of a perforated wall on the air resistance produced by a high-speed train passing through a tunnel was studied based on the one-dimensional unsteady compressible non-homentropic fluid flow model and the characteristics of the generalized Riemann variables method. The variation laws of the maximum and average values of the air resistance of tunnels of different lengths with or without perforated walls were simulated, and it was concluded that a tunnel with a perforated wall may significantly reduce air resistance and that tunnel length does not affect the amplitude of air resistance under a certain speed. The effects of hole spacing, hole size and the running speed of a train on air resistance was analyzed for a 2 000 m-long tunnel with a perforated wall. The relationship among the air resistance, compression wave and expansion wave produced by a train passing through a tunnel with a perforated wall are discussed, as well as the relationship between the maximum air resistance and train speed
Abstract：
A tunnel with a perforated wall is a new type of high-speed railway tunnel structure, and the aerodynam? ics induced by the passing of a high-speed train through the tunnel will differ from those of traditional tunnel. In this paper, the effects of a perforated wall on the air resistance produced by a high-speed train passing through a tunnel was studied based on the one-dimensional unsteady compressible non-homentropic fluid flow model and the characteristics of the generalized Riemann variables method. The variation laws of the maximum and average values of the air resistance of tunnels of different lengths with or without perforated walls were simulated, and it was concluded that a tunnel with a perforated wall may significantly reduce air resistance and that tunnel length does not affect the amplitude of air resistance under a certain speed. The effects of hole spacing, hole size and the running speed of a train on air resistance was analyzed for a 2 000 m-long tunnel with a perforated wall. The relationship among the air resistance, compression wave and expansion wave produced by a train passing through a tunnel with a perforated wall are discussed, as well as the relationship between the maximum air resistance and train speed
.Numerical Simulation of Air Resistance Generated by a High-Speed Train Passing through a Tunnel with a Perforated Wall[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(4): 152-159
2017, Vol. 54 