Abstract
A scaled train tunnel simulator has been constructed for investigating weak shock waves which are generated in a long tunnel when a high-speed train enters it. The simulator consists of a driver section which can launch a 50 g and 18 mm diam piston (model train) at up to 120 m/s (430 km/h) and a 40 mm diameter and 25 m long tube. The entire tunnel simulator is inclined by 8° so that the decrease of the piston speed is minimized. The performance of the driver section is analyzed and a simple algebraic formulation is obtained. Mainly due to aerodynamic drag force, the piston speed is decreased by at most 10% through the tube. The effect of the decrease of the piston speed on shock wave generation processes is found to be negligible. Using this scaled train tunnel simulator, the overpressure of shock waves which is generated by a high-speed train is well reproduced by laboratory experiments.
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