Abstract
The study of aerodynamic processes in railway tunnels on highspeed railways in the absence of practical experience in operation should be carried out with a sufficient degree of accuracy only by mathematical modeling. A multi-factor experiment was performed, which resulted in solving the optimization task of determining the tunnel cross-sectional area, taking into account aerodynamic processes. Based on the analysis of the results, the conclusion is made about the applicability of the method to the prognosis of aerodynamic effects on prospective tunnel structures of high-speed railways and optimization of geometric parameters of the tunnels.
Highlights
Aerodynamic processes in high-speed train traffic make the design of the cross-sectional area of tunnels one of the most difficult issues in tunnel construction
The purpose of the study is to substantiate the parameters of the cross-section area of tunnels on the high-speed railways (HSR) depending on the trains velocity, taking into account aerodynamic processes, as well as to determine whether the geometric parameters of tunnel structures meet the aerodynamic requirements, and to confirm the proposed hypothesis of the behavior of the multi-factor system "tunnel-train" in high-speed traffic
The study established the applicability of the safety criterion ΔP≤10 kPa to the justification of the geometric parameters of tunnel structures on the HSR, and determined the aerodynamic parameters and loads in the set on the basis of the optimal experiment planning program
Summary
Aerodynamic processes in high-speed train traffic make the design of the cross-sectional area of tunnels one of the most difficult issues in tunnel construction. There are methods of research in aerodynamic tubes (wind tunnels) based on the principle of movement reversibility and similarity theory - it involves blowing air flow (air injection devices) of a stationary model; as well as "centrifugal" modeling, in which the air flow is generated by the object model, which allows simulating inertial interactions These methods are reasonably applicable for measuring the values of pressure on the object surfaces, acting forces, studying the influence of temperatures and acoustic fields, and visualizing flows from the point of view of hydromechanics and aeromechanics. They have a number of disadvantages, including inappropriate similarity of the generated air flow and similarity criteria for other parameters (flow velocity and models, geometry of research objects), as well as complexity. In the absence of experience in designing tunnels on high-speed railways (HSR), mathematical modeling becomes the only way
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