하이퍼 튜브 내부에서 BR 계수 변화에 따른 칸트로위쯔 한계 현상 수치 해석

초록

The hyper tube train traveling inside tube has a different aerodynamic phenomena with the high speed train running in the open space. The maximum speed in the tube is limited by ‘Kantrowitz Limit’ phenomena caused by choking flow. The Kantrowitz Limit is influenced by the ratio of train cross section area to tube cross-section area which is called blockage ratio (BR). In this study, the Kantrowitz Limit phenomena in the tube is numerically and theoretically investigated according to the variation of BR when high speed train (pod) is traveling in the tube. The speed of train is fixed to 170m/sec and BRs are varied from 0.3 to 0.8. Large eddy simulation method is applied to solve the momentum equation. The pressure coefficient around train is calculated and compared with theoretical equation.