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Method for obtaining fire heat release rate of high-altitude tunnel

A technology of heat release rate and high altitude, applied in the direction of material thermal development, etc., can solve the problems of high altitude tunnel disaster prevention design and personnel evacuation safety impact, and the method of obtaining high altitude tunnel fire heat release rate has not been obtained.

Inactive Publication Date: 2020-04-17
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, there is still no research on the effect of altitude on the change of fire source scale, and no method for obtaining the heat release rate of high-altitude tunnel fires
This has a serious impact on the disaster prevention design and personnel evacuation safety of high-altitude tunnels

Method used

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  • Method for obtaining fire heat release rate of high-altitude tunnel
  • Method for obtaining fire heat release rate of high-altitude tunnel
  • Method for obtaining fire heat release rate of high-altitude tunnel

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Embodiment

[0031] In the present invention, by establishing a mobile model tunnel fire test platform, the oil pools under the same oil pan size and fuel volume conditions are respectively tested at different altitudes for fire field experiments and research tests; by measuring the mass loss rate of the oil pool, the obtained The heat release rate of fires at different altitudes; and the heat release rate at different altitudes is obtained based on the heat release rate of fires obtained at the base altitude.

[0032] The methods for obtaining the heat release rate of tunnel fires at different altitudes specifically include:

[0033] (1) Based on the low-altitude plain area, this example is based on the Chengdu Plain at an altitude of 504m. The method for obtaining the heat release rate of a tunnel fire is:

[0034]

[0035] The fire heat release rate is obtained by using the fuel mass loss rate method, where η is the combustion efficiency; is the mass loss rate, kg / m 2 .s; △H c,ef...

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Abstract

The invention discloses a method for obtaining the fire heat release rate of a high-altitude tunnel. The method comprises the following steps: establishing a mobile model tunnel fire test platform, and respectively carrying out fire field test on oil pools with the same and different oil pan sizes and fuel volumes at different altitudes; by measuring the mass loss rates of the oil pool at different altitudes, obtaining the combustion efficiency changing along with the altitudes; on the basis of a low-altitude plain area, obtaining the change rule of the basic heat release rate of the low-altitude plain area and the heat release rates of tunnels at different altitudes, and expressing the change rule as a corresponding calculation formula according to the combustion efficiency changing alongwith the altitudes. Through moving the model tunnel fire test platform, fire field test research is carried out at different altitudes; the mass loss rate of an oil pool and the combustion efficiencychanging along with the altitude are measured to obtain each high-altitude fire heat release rate and the relationship between the fire heat release rate and the altitude. The method provides a basisfor tunnel fire design at different altitudes.

Description

technical field [0001] The invention belongs to the technical field of fire protection design for tunnel construction, and in particular relates to a method for obtaining the heat release rate of high-altitude tunnel fires. Background technique [0002] With the continuous advancement and improvement of the country's western development, some plateau tunnel construction projects have gradually entered the implementation stage, and high-altitude highway tunnels with an altitude of more than 3500m are also emerging. For example, the Yakexia Snow Mountain Tunnel in Sichuan at an altitude of 3900m, the Baimang Snow Mountain Tunnel in Yunnan at an altitude of 4060m, and the Changla Mountain Tunnel in Qinghai at an altitude of 4499m. Compared with plain tunnels, there are several notable environmental characteristics in high-altitude tunnels: low air pressure, low oxygen content, and low temperature. These features are bound to greatly change the characteristics of tunnel fire co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/22
CPCG01N25/22
Inventor 王峰黄玉冰朱磊张路华罗飞宇戴开来王宇
Owner SOUTHWEST JIAOTONG UNIV
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