Aerodynamic Effects of Inclined Portals on the Initial Compression Wave Generated by a High Speed Train Entering a TunnelSource: Journal of Fluids Engineering:;2015:;volume( 137 ):;issue: 012::page 121104DOI: 10.1115/1.4030843Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The micropressure wave radiated from a tunnel exit is one of the environmental problems which can be investigated from the temporal pressure gradient of the compression wave. The effects of inclined portals on the initial compression wave, specifically the maximum temporal pressure gradient, are numerically studied by solving the flow field during a highspeed train nose entering a tunnel, using the unsteady threedimensional (3D) Euler equations. After mesh independency and temporal sensitivity tests of the numerical method, validations are conducted by comparing the numerical results with experimental and numerical data. The temporal gradients of pressure wavefront are parametrically investigated for different combinations among the train speed, the blockage ratio of the train to tunnel, and inclination angle of the tunnel entrance. The numerical results show a negligible influence of train Mach number or blockage ratio on the normalized pressure gradient and noticeable effects of inclination angle, location of the train with respect to the median line of a doubletracked tunnel (DT), and the profile of train nose. Based on the numerical results, an empirical formula is proposed to predict the relationship between the maximum pressure gradient and the inclination angle of tunnel entrance.
|
Collections
Show full item record
contributor author | Xiang, Xintao | |
contributor author | Xue, Leiping | |
contributor author | Wang, Benlong | |
date accessioned | 2017-05-09T01:19:15Z | |
date available | 2017-05-09T01:19:15Z | |
date issued | 2015 | |
identifier issn | 0098-2202 | |
identifier other | fe_137_12_121104.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/158339 | |
description abstract | The micropressure wave radiated from a tunnel exit is one of the environmental problems which can be investigated from the temporal pressure gradient of the compression wave. The effects of inclined portals on the initial compression wave, specifically the maximum temporal pressure gradient, are numerically studied by solving the flow field during a highspeed train nose entering a tunnel, using the unsteady threedimensional (3D) Euler equations. After mesh independency and temporal sensitivity tests of the numerical method, validations are conducted by comparing the numerical results with experimental and numerical data. The temporal gradients of pressure wavefront are parametrically investigated for different combinations among the train speed, the blockage ratio of the train to tunnel, and inclination angle of the tunnel entrance. The numerical results show a negligible influence of train Mach number or blockage ratio on the normalized pressure gradient and noticeable effects of inclination angle, location of the train with respect to the median line of a doubletracked tunnel (DT), and the profile of train nose. Based on the numerical results, an empirical formula is proposed to predict the relationship between the maximum pressure gradient and the inclination angle of tunnel entrance. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Aerodynamic Effects of Inclined Portals on the Initial Compression Wave Generated by a High Speed Train Entering a Tunnel | |
type | Journal Paper | |
journal volume | 137 | |
journal issue | 12 | |
journal title | Journal of Fluids Engineering | |
identifier doi | 10.1115/1.4030843 | |
journal fristpage | 121104 | |
journal lastpage | 121104 | |
identifier eissn | 1528-901X | |
tree | Journal of Fluids Engineering:;2015:;volume( 137 ):;issue: 012 | |
contenttype | Fulltext |