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Characteristics of a Flow Field Generated by a Breach on an Evacuated Tube

Characteristics of a Flow Field Generated by a Breach on an Evacuated Tube Numerical simulations using the 3-dimensional unsteady Navier–Stokes equation were performed to understand the characteristics of a flow field generated by a breach on an evacuated tube which is one of the serious risks for the Hyperloop system. The breach situation was set up with inflow from the atmosphere into the interior of the evacuated tube of 100 Pa for various breach diameters with fixed tube diameter. Three aspects of the flow field, the strong inflow through the breach, pressure waves propagating along the tube, and a pulse-like wave radiating to the atmosphere were identified from the simulation results, and enhanced analysis were conducted on these phenomena. It was found that the mass flow rate through the breach was proportional to the breach area, and the characteristic pressure variables followed the power-fit curves with the breach area. To characterize the inflow through the breach, the discharge coefficient was introduced, and the resulting value of the coefficient was 0.41 over the simulation conditions. A simple model for the near flow just downstream of the breach was proposed to explain the linear relationship between the intensity of the pressure wave along the tube and the ratio of the breach and tube diameters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Aeronautical and Space Sciences Springer Journals

Characteristics of a Flow Field Generated by a Breach on an Evacuated Tube

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References (28)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to The Korean Society for Aeronautical & Space Sciences 2022
ISSN
2093-274X
eISSN
2093-2480
DOI
10.1007/s42405-022-00479-y
Publisher site
See Article on Publisher Site

Abstract

Numerical simulations using the 3-dimensional unsteady Navier–Stokes equation were performed to understand the characteristics of a flow field generated by a breach on an evacuated tube which is one of the serious risks for the Hyperloop system. The breach situation was set up with inflow from the atmosphere into the interior of the evacuated tube of 100 Pa for various breach diameters with fixed tube diameter. Three aspects of the flow field, the strong inflow through the breach, pressure waves propagating along the tube, and a pulse-like wave radiating to the atmosphere were identified from the simulation results, and enhanced analysis were conducted on these phenomena. It was found that the mass flow rate through the breach was proportional to the breach area, and the characteristic pressure variables followed the power-fit curves with the breach area. To characterize the inflow through the breach, the discharge coefficient was introduced, and the resulting value of the coefficient was 0.41 over the simulation conditions. A simple model for the near flow just downstream of the breach was proposed to explain the linear relationship between the intensity of the pressure wave along the tube and the ratio of the breach and tube diameters.

Journal

International Journal of Aeronautical and Space Sciences – Springer Journals

Published: Nov 1, 2022

Keywords: Hyperloop; Evacuated tube; Breach; Computational fluid dynamics; Pressure wave

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