초고속 튜브트레인 아음속 및 초음속 유동 해석을 통한 공력 저항 비교 분석

초록

The aerodynamic drag and pressure behavior for supersonic and subsonic flow of high-speed tube train are investigated using 3D and 2D CFD. Speed of capsule train is increased from Mach = 0.4 to 0.9 to analyze velocity vectors around train. Secondary flows are found to move toward the upper part from the bottom and a pair of vortex is generated in the wake region. In the subsonic flow, normal shock is generated just behind tail. However, in the supersonic flow normal shock is also generated in front of train head which is moving toward more upper region as the speed of capsule train is close to Mach = 1.0(1,224 km/h). Two dimensional CFD is employed to solve the supersonic flow due to a demand for large number of grids and a limitation of calculation capacity in supersonic flow. The aerodynamic drag is 435.7N at Mach = 0.9(1,100 km/h) and 1,200N at Mach = 2.0(2,448 km/h) which is increased 2.8 times.

키워드