Theoretical and numerical study of choking mechanism of fluid flow in Hyperloop system

Yu, Qiujun; Yang, Xiaofeng; Niu, Jilei; Sui, Yang; Du, Yanxia; Yuan, Yanping

doi:10.1016/j.ast.2022.107367

Cited by 15 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, they found that symmetrically shaped capsule is lower than the other types, while aerodynamic lift varies drastically with the shapes. Yu et al [24] recently investigated the choking mechanism with the corresponding physics and nature of the choked flow. According to this study, the intensity of choking increases with the acceleration of the capsule up to Mach 1, and then gradually diminishes with the elevation of the vehicle's speed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Aerodynamic Characteristics of Hyperloop System Using Optimized Capsule Design

Roy

Rahman²,

Halder³

2023

Int. J. Automot. Mech. Eng.

View full text Add to dashboard Cite

As a consequence of research on developing a speedy transportation system, Hyperloop is one of the best solutions now as smaller resistant forces are developed on the capsule body compared to conventional ground transportation systems due to movement in a vacuum and no contact with the ground. In this study, a capsule of an elliptical-shaped head and semicircular-shaped rear was chosen for analysis. Aerodynamic drags were calculated at different evacuated tunnel pressures. The computational regime was a 360 meters long tunnel. The inlet and outlet were pressure far-field boundaries while the wall was moving, with a Blockage Ratio (BR) of 0.36. Characteristics of different regions were identified in choked conditions. The drag was found to be lesser than the capsule of semicircular ends at different speeds. The pressure drag and friction drag were increased with the increase in velocity in the same tunnel pressure. By investigating different flow regions, it was found that a series of rhomboidal-shaped shock waves appear at high speeds. The formation and nature of this shock wave were also investigated, and found that it is caused due to shock wave and expansion wave interaction that results in the fall of pressure and temperature in the wake region.

show abstract

Section: Introductionmentioning

confidence: 99%