Parameter study and optimization design of a hat oblique tunnel portal. (March 2022)

• Record Type: Journal Article
• Authors: Guo, Zijian; Liu, Tanghong; Li, Wenhui; Xia, Yutao
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 236:Number 3(2022)
• Page Start: 234
• Page End: 246
• Publication Date: 2022-03
• Subjects: Hat oblique portal -- high-speed train -- micro-pressure wave -- optimization -- transient pressure; Railroads -- Periodicals; Personal rapid transit -- Periodicals; 625.1
• DOI: 10.1177/09544097211014075
• Languages: English
• ISSNs: 0954-4097

Abstract

The present work focuses on the aerodynamic problems resulting from a high-speed train (HST) passing through a tunnel. Numerical simulations were employed to obtain the numerical results, and they were verified by a moving-model test. Two responses, Δ C p (coefficient of the peak-to-peak pressure of a single fluctuation) and P mpw (pressure value of micro-pressure wave), were studied with regard to the three building parameters of the portal-hat buffer structure of the tunnel entrance and exit. The MOPSO (multi-objective particle swarm optimization) method was employed to solve the optimization problem in order to find the minimumΔ C p and P mpw . Results showed that the effects of the three design parameters onΔ C p were not monotonous, and the influences of α (the oblique angle of the portal) andh (the height of the hat structure) were more significant than that of β (the angle between the vertical line of the portal and the hat). Monotonically decreasing responses were found in P mpw forα and β . The Pareto front ofΔ C p and P mpw was obtained. The ideal single-objective optimums for each response located at the ends of the Pareto front had values of 1.0560 forΔ C p and 101.8 Pa for P mpw .