Method for calculating micro-pressure waves generated in process of passing through tunnel by high-speed train

Abstract

The invention relates to a method for calculating micro-pressure waves generated in the process of passing through a tunnel by a high-speed train. The method for calculating micro-pressure waves is characterized by comprising the following steps: dividing a flow field of the tunnel into a plurality of areas by using a dynamic mesh; calculating areas containing a first compression wave and an expansion wave and an area before the compression wave and the expansion wave; and simulating to obtain a micro-pressure wave value of a tunnel outlet. The method for calculating the micro-pressure waves generated in the process of passing through a tunnel by a high-speed train better solves the problems of oversize scale, overlong calculating period, and the like of a three-dimensional calculating mesh of a long tunnel and a tunnel group. In the method, the flow field is divided into a plurality of the areas by adopting dynamic mesh technology and the value simulation on the micro-pressure waves of the tunnel outlet are carried out by only calculating the areas containing the first compression wave and the expansion wave and the area before the first compression wave and the expansion wave according to the forming mechanism of the micro-pressure waves. Meanwhile, the invention provides a new method for the calculation of the micro-pressure waves of the tunnel outlet.

Description

technical field [0001] The invention belongs to the field of measuring the influence of micro-pressure waves produced by long tunnels on the environment when trains pass through tunnels at high speed, and in particular relates to a simplified and efficient calculation method for micro-pressure waves after high-speed trains pass through tunnels. Background technique [0002] my country's railways are in an important period of leapfrog development. After the sixth large-scale speed increase of the existing main railway lines, the maximum operating speed of passenger trains has reached 250km / h. For example, the maximum operating speed of the Beijing-Tianjin Passenger Dedicated Line has reached 350km / h. The construction of a passenger dedicated line running at a higher speed has started, and it is expected to be completed around 2010, and will run high-speed trains with a speed of 380km / h. my country is a mountainous country, and there are more than 5,000 tunnels on the line. As ...

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Problems solved by technology

[0003] The numerical simulation methods of micro-pressure waves at the tunnel exit mainly include one-dimensional algorithm and three-dimensional numerical simulation method. The one-dimensional algorithm has the characteristics of simple algorithm and high efficiency. Accurately simulate the impact of shafts and buffer structures with skylights on the aerodynamic effect of tunnels; 3D numerical simulation methods generally use 3D compressible unsteady Reynolds-averaged N-S equations, combined with slip grid technology to directly simulate tunnel micro-pressure waves , the feature of this method is that it can directly simulate the detailed structure of trains and tunnels, and the three-dimensional effects of trains entering and exiting tunnels. The scale is too large, the calculation cycle is too long, and it can only be solved on large and medium workstations

[0004] In addition, there is still no good method in the prior art to simulate the process of the train passing through the curved tunnel, and it is also impossible to evaluate the micro-pressure wave at the exit of the curved tunnel

When the train passes through the variable section of the tunnel, new expansion waves and compression waves will be generated, and the compression waves and expansion waves generated at the entrance of the tunnel will also change the direction of propagation through the reflection of the tunnel wall during the propagation process, making the flow field in the tunnel more complicated

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