Numerical Investigation of Aerodynamic Drag on Vacuum Tube High Speed Train

Bibin, Sreeja; Mukherjea, S. K.

doi:10.1115/imece2013-65703

Cited by 8 publications

(5 citation statements)

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“…Different shapes of the pod have been studied in previous studies to reduce the aerodynamic drag on the pod. 10,[27][28][29] This study used the ideal pod shape for both pods. For this purpose, both pods' semicircular nose and tail were selected to study the aerodynamic characteristics.…”

Section: Computational Domainmentioning

confidence: 99%

“…The researchers' primary objective for the Hyperloop system is to reduce the aerodynamic drag value, which will result in economic efficiency and feasibility of high-speed trains/pods. Various researchers study the aerodynamic properties of the Hyperloop system by changing the speed of the pod, 7,[9][10][11][12][13] the pressure inside the tube, 7,[9][10][11]13 the shape of the pod, 9,14 the variation of the blockage ratio (i.e., which is the ratio of the cross-sectional area of the pod to the crosssectional area of the tube), [10][11][12] and the length of the tube. 7 Increasing the pod's speed or pressure of the tube or blockage ratio (BR) or size of the pod results in an increase in the value of aerodynamic drag value and vice versa.…”

Section: Introductionmentioning

confidence: 99%

“…The study of the generation of this shockwave has been conducted under steady-state conditions and unsteady conditions. 7,[9][10][11][12][13]15,16 However, the propagation of the pressure waves cannot be studied under steady-state conditions. Moreover, the reflection of the pressure waves from the boundary of the computational domain has an adverse effect on the results of the simulation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of aerodynamic characteristics of multi-pod hyperloop system

Mirza

Ali

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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The Hyperloop system is a new and innovative mode of transportation in which high-speed pods move through near-vacuum tubes. The multi-pod Hyperloop Systems are essential for increased transportation capacity. In this study, a multi-pod Hyperloop System was analyzed using numerical simulations at different values of the distance between the pods (i.e., 2 L–3.5 L). The pressure and velocity flow fields and the aerodynamic characteristics of the pods were analyzed for four different flow speeds, that is, 100, 200, 300, and 400 m/s, using unsteady compressible flow conditions. The simulation results indicated that the pressure waves generated across the pods play a significant role in the determination of the aerodynamic characteristics of the pods. Increasing the distance between the pods results in the delay of the pressure wave interaction. The aerodynamic drag increases on the first pod with the increase in the distance between the pods due to an increase in the pressure gradient. In contrast, the aerodynamic drag decreases across the second pod with the increase in the distance between them. So, the distance between the pods is a critical factor that should be considered when designing the Hyperloop System with more than one pod.

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Section: Computational Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of aerodynamic characteristics of multi-pod hyperloop system

Mirza

Ali

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Different geometries of trains have been identified and modelled. Bibin et al (2013) found that a blockage ratio of 0.25 would be most appropriate for vacuum tube transportation. This effect taking into consideration with the assumption that the flow is steady three dimensional, compressible.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Aerodynamic Drag Effects on Vacuum Tube Trains

Gillani

Panikulam

Sadasivan

et al. 2019

JAFM

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Aerodynamic aspects of train shapes suitable for Vacuum Tube Train System are investigated in this paper. Three feasible geometries for the vacuum tube train system have been considered and modelled in three dimensions and have been computationally studied using the commercial software Ansys Fluent. Aerodynamic drag loads on these geometries have been calculated under different tube pressures and speeds of the train, which provide insight on various operating parameters that need to be considered while designing the vacuum tube train system. The present computational research shows that, the suitable vacuum pressure, and different shapes of head and tail of the train have significantly effects the drag force of the vacuum train in the tunnel. Overall, the elliptical train shape with a height to base ratio of 2:1 is more efficient for aerodynamic drag reduction of the vacuum tube train at the vacuum tube pressure of 1013.25 Pa.

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“…Hence, aerodynamics of the HTS Maglev-ETT system is a new subject needed further research. Many groups have simulated aerodynamics of the vacuum tube train and analyzed the effect of the vehicle speed, blockage ratio, and air pressures [9,10] . Nonetheless, due to the lack of experimental facilities, there is little work on the related experiments.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Aerodynamic Characteristics of High Temperature Superconducting Maglev-Evacuated Tube Transport System

Bao¹,

Wang²,

Zhang³

et al. 2017

dtetr

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In the high temperature superconducting maglev-evacuated tube transport (HTS Maglev-ETT) system, the air drag is the most principal resistance to the speed improvement and energy conservation. Considering the aerodynamic performance of the HTS Maglev-ETT system has great significance in practical application. As the first step, we experimentally explored the influence of velocity, blockage ratio and airshaft on the air drag of a running maglev vehicle at atmospheric pressure (95.6 kPa in Chengdu), coupled with the simulation by using the ANSYS-FLUENT software. The results preliminarily confirmed the feasibility of the aerodynamic experiments on the HTS maglev-ETT test system, as the drag is proportional to the blockage ratio and the square of velocity respectively. Moreover, airshafts are suggested to be added in the future design of the HTS Maglev-ETT system, aimed at its good relief on the air drag displayed in the experiment and simulation.

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Numerical Investigation of Aerodynamic Drag on Vacuum Tube High Speed Train

Cited by 8 publications

References 0 publications

Numerical analysis of aerodynamic characteristics of multi-pod hyperloop system

Numerical analysis of aerodynamic characteristics of multi-pod hyperloop system

CFD Analysis of Aerodynamic Drag Effects on Vacuum Tube Trains

Preliminary Study of Aerodynamic Characteristics of High Temperature Superconducting Maglev-Evacuated Tube Transport System

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