Effects of eccentricity in tube–pod arrangements on hyperloop aerodynamics

Kim, Jihoon; Lee, Changyoung; Le, Thi Thanh Giang; Kim, Dokyun; Won, Yoonjin; Cho, Minki; Ryu, Jaiyoung

doi:10.1016/j.ijmecsci.2024.109505

International Journal of Mechanical Sciences

2024

DOI: 10.1016/j.ijmecsci.2024.109505

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Effects of eccentricity in tube–pod arrangements on hyperloop aerodynamics

Jihoon Kim,

Changyoung Lee,

Thi Thanh Giang Le

et al.

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2024

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Cited by 2 publications

References 74 publications

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Numerical characterization of a hyperloop propelling nozzle and its adaption to an experimental wind tunnel

Galindo,

Dolz,

Navarro

et al. 2024

Physics of Fluids

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Hyperloop systems, where a pod travels at high speed within a tube under rarefied conditions, have a maximum speed limit due to the Kantrowitz effect. One solution to overcome this limit is to include a circuit with a fan that can also assist the pod's propulsion through a nozzle at the vehicle's rear. This paper focuses on analyzing the propulsive efficiency of these coaxial jets within a tube at low-pressure conditions. The paper's objective is to use a computational fluid dynamics tool to design an experiment in a wind tunnel with a steady tube and vehicle that could reproduce the actual operation of a stationary tube and a moving vehicle. Several issues are dealt with. First, the effect of the vehicle's front design on the coaxial jets, which resulted be negligible. Additionally, the increase in temperature in the compressor circuit can be neglected, simplifying the experimental arrangement. Third, scaling the wind tunnel prototype shows that the difference in size can be compensated by setting the test pressure at ambient conditions. Finally, considering steadiness in the vehicle in the test leads to a different velocity pattern in the coaxial jets. Several changes in the tube's geometry are proposed and analyzed to address this problem. The results demonstrate that it is possible to replicate the actual coaxial jets in steady conditions with a small tapered section in the tube. Furthermore, this modification can be used over a relatively large range of operating conditions and for different rear pod designs.

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Numerical characterization of a hyperloop propelling nozzle and its adaption to an experimental wind tunnel

Galindo,

Dolz,

Navarro

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

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Numerical Investigation of Jet-Propelled Multiple-Vehicle Hyperloop System Considering the Suspension Gap

Alzhrani,

Abdulla,

Juhany

et al. 2024

Sustainability

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The Hyperloop system offers revolutionary transportation, aiming for near-sonic speeds in a low-pressure environment. The aerodynamic design challenges of multiple vehicles in a confined tube remain largely unexplored, particularly regarding vehicle spacing and suspension gaps. This study investigates a jet-propelled, multi-vehicle Hyperloop system using Reynolds-Averaged Navier–Stokes (RANS) equations and the k−ω turbulence model. Analysis of suspension gaps and vehicle spacing on drag and thrust revealed that suspension gaps cause significant jet deflection, reducing effective thrust and increasing drag. It was found that vehicle suspension, with a 75 mm suspension gap, increased drag by 58% at Mach 0.7 compared to the unsuspended configuration. Meanwhile, smaller vehicle spacing (Xv=0.25Lv) reduced the drag by up to 50%, enhancing system efficiency. The results emphasize the need to address the effect of jet deflection and optimize vehicle spacing for maximum energy savings. These findings offer valuable insights for enhancing aerodynamic performance in multi-vehicle Hyperloop systems.

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Effects of eccentricity in tube–pod arrangements on hyperloop aerodynamics

Cited by 2 publications

References 74 publications

Numerical characterization of a hyperloop propelling nozzle and its adaption to an experimental wind tunnel

Numerical characterization of a hyperloop propelling nozzle and its adaption to an experimental wind tunnel

Numerical Investigation of Jet-Propelled Multiple-Vehicle Hyperloop System Considering the Suspension Gap

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