A calculation method of an air curtain heat preservation theory of a railway tunnel in a cold region

A technology of tunnel air and calculation method, applied in tunnels, calculations, tunnel linings, etc., can solve the problems of operating tunnels that are not suitable for high-speed railways in cold regions, and achieve the effect of maintaining temperature and preventing frost heave

Active Publication Date: 2019-01-11
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

Most of the existing calculation theories for air curtains are related to cold storage gates and mine roadways, and are not suitable for high-speed railway operation tunnels in cold regions.

Method used

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  • A calculation method of an air curtain heat preservation theory of a railway tunnel in a cold region
  • A calculation method of an air curtain heat preservation theory of a railway tunnel in a cold region
  • A calculation method of an air curtain heat preservation theory of a railway tunnel in a cold region

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Embodiment

[0114] Take the 300km / h single-track tunnel of the high-speed railway in the cold area as an example, in which the nozzle length b 0 9.3001m, spout width B 1 is 0.3m, the turbulence coefficient a is 0.2, the natural wind speed ω outside the tunnel is 5m / s, and the jet velocity of the nozzle at the tunnel mouth ω 0 The range is 0~25m / s, the range of jet angle α is 1°~90°, the average height H of the tunnel entrance is 8.7676m, the maximum horizontal span B of the tunnel is 9.3001m, and the perennial temperature range outside the tunnel is -30℃~0 ℃, the perennial temperature range in the tunnel is -5℃~0℃. Use MATLAB software to analyze the relationship between the air curtain jet angle, jet velocity and barrier efficiency, and analyze the relationship between the nozzle temperature and the temperature inside and outside the tunnel, such as Figure 7 , Figure 8 As shown, the analysis results show that:

[0115] (1) By measuring data such as the natural wind speed outside the...

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Abstract

The invention discloses a calculation method of an air curtain heat preservation theory of a railway tunnel in a cold region, which comprises the following steps: obtaining tunnel section design drawing, air curtain basic parameters and tunnel internal and external environment parameters; calculating the barrier efficiency of air curtain; according to the temperature inside and outside the tunnel,the quantity of air ejected from the air curtain jet and the quantity of air mixed into the air curtain inside and outside the tunnel, the optimum temperature of the air curtain jet is obtained by the heat balance principle. This method is mainly used to calculate the barrier efficiency of air curtain and the temperature of mixed gas flow in tunnel; the method is suitable for the design of air curtain size, or for the calculation of jet velocity, jet angle and jet temperature during the operation of air curtain, so as to achieve the purpose of blocking the air flow inside the tunnel and maintaining the temperature inside the tunnel in the cold region by multiple vertical air curtains, and prevent the frost heave in the tunnel in the cold region.

Description

technical field [0001] The invention relates to a calculation method for the air curtain heat preservation theory of railway tunnels in cold regions. Background technique [0002] The construction and operation of a large number of railway tunnels in cold regions shows that freezing damage caused by low temperature generally exists in railway tunnels. These freezing damages not only cause serious damage to tunnel structures, but also bury major safety hazards for railway operation safety. Laying the insulation layer is a passive cold-proof insulation measure commonly used in China at present. It has a certain scope of application, or because the thickness of the insulation layer is not suitable for extreme low temperature, or because the low temperature is too long, or the insulation performance of the material is reduced due to water seepage, so it is not necessary. Not suitable for all cold area tunnels, especially high-speed railway tunnels. Therefore, it is of great the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21D11/38
CPCE21D11/38G06F2119/08G06F30/13
Inventor 丁云飞高焱夏晶晶耿纪莹周君李峥嵘凌田陈昕王敏朱奇
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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