Reduction of pressure transients of high-speed train passing through a tunnel by cross-section increase. Issue 183 (December 2018)

• Record Type: Journal Article
• Authors: Wang, Tiantian; Wu, Fan; Yang, Mingzhi; Ji, Peng; Qian, Bosen
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 183(2018)
• Page Start: 235
• Page End: 242
• Publication Date: 2018-12
• Subjects: High-speed train -- Tunnel -- Pressure reduction -- Enlarged section -- Numerical simulation; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2018.11.001
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: This study investigates the alleviation effect of partially enlarged cross-section on tunnel aerodynamics. By comparing the numerical results to moving model tests data, the SST k-ω turbulence model and hybrid grid are used for the numerical simulations of high-speed train passing through tunnel. The reduction effects of three parameters for the enlarged section are analyzed, i.e., length, cross-sectional area, and slope. Systematic numerical simulations show that the terminal location of the enlarged section should be close to the location of the initial compression wave amplitude along tunnel length direction. The reduction rates of the pressure transient amplitude and the average pressure variation follow a second order polynomial equation with the increase of the enlarged section area, and increase with the increase of enlarged section slope. Positive enlarged section slope is applied for reducing pressure transients in the tunnel. Furthermore, an engineering application equation is proposed, with which the reduction rates of enlarged sections on the pressure transient amplitude and the average pressure variation can be estimated effectively. The equation generalized in this study could well guide the tunnel design process. Highlights: The SST k-ω turbulence model with hybrid grid achieved best accuracy in simulation. The optimum length of the enlarged section is obtained. The relationship of pressure transients and cross-sectional area is derived. An engineering equation regarding pressure transient reduction is proposed.