城市地下交通联系隧道火灾通风网络模拟

发布时间：2018-04-18 04:36

本文选题：城市地下交通联系隧道 + 通风网络　；参考：《重庆大学》2015年硕士论文

【摘要】：随着我国城市化的迅速发展,交通堵塞的问题变得日益严重,地面上的交通道路已经不能满足机动车辆迅速增长的需要,我国在现有的国家资源基础上全面考虑环境、经济效益和投资成本的综合影响,在许多城市中开拓地下空间系统,比如在地下修建地铁、公路隧道、快速通道等交通网络系统,其中包括一种新型的地下交通网络系统——城市地下交通联系隧道。城市地下交通联系隧道由主环路和坡度较大的出入口隧道组成。城市地下交通联系隧道主环路通常与多个地下车库相连接,出入口隧道与地上主干道相连接,缓解车辆高峰地段的堵塞问题。城市地下交通联系隧道复杂的结构使其拥有更复杂的火灾通风系统。城市地下交通联系隧道火灾通风时各通道的风流实际流动方向的确定,各通道实际风量值、温度值以及压力值的求解,风机设备的匹配方案的确定等都是城市地下交通联系隧道火灾通风过程中需要解决的问题。为解决上述问题,以图论理论为基础将城市地下交通联系隧道简化为网络图的形式,建立城市地下交通联系隧道火灾通风网络模拟数学模型,在此基础上编写火灾通风网络程序进行模拟计算,是定量描述城市地下交通联系隧道火灾通风网络系统的一个新方法。本文研究的具体内容包括:(1)建立城市地下交通联系隧道火灾通风网络数学模型,包括通风动力模型、温度模型、热源模型、围护结构传热模型等。(2)采用CFD与网络模拟相结合的方法,计算城市地下交通联系隧道复杂结构的局部阻力系数,并将计算的阻力系数作为网络模拟解算程序的输入参数。(3)利用matlab将城市地下交通联系隧道火灾通风网络模拟数学模型编制为计算程序,在城市地下交通联系隧道火灾工况下采用不同的通风方案时,包括射流风机纵向通风系统、竖井纵向通风系统、半横向通风系统、自然通风系统,计算各种火灾通风方案的隧道参数如风量、温度、压力等,并确定通风设备所需提供的压力或流量,优化城市地下交通联系隧道火灾通风方案。通过城市地下交通联系隧道火灾通风网络模拟计算,得到比较准确的隧道内流量、温度、压力等参数的分布,有助于更合理地确定隧道具体的通风排烟方案。为其他类似的实际工程隧道确定火灾通风排烟方案提供一种计算方法,进而可对火灾通风方案的安全可靠性分析提供帮助。
[Abstract]:With the rapid development of urbanization in our country, the problem of traffic jam becomes more and more serious. The traffic road on the ground can no longer meet the need of the rapid growth of motor vehicles. Our country considers the environment comprehensively on the basis of the existing national resources.The combined effects of economic benefits and investment costs have led to the development of underground space systems in many cities, such as the construction of underground subway, highway tunnels, express access and other transportation network systems.It includes a new kind of underground traffic network system-urban underground traffic connection tunnel.The urban underground traffic connection tunnel is composed of the main loop road and the entrance and exit tunnel with high slope.The main loop road of urban underground traffic connection tunnel is usually connected with many underground garages, and the entrance and exit tunnel is connected with the above ground main road to alleviate the congestion problem in the rush hour section of vehicles.Urban underground traffic is linked to the complex structure of tunnels so that it has a more complex fire ventilation system.The determination of the actual flow direction of each passage, the solution of the actual wind value, temperature value and pressure value of each passage when the urban underground traffic is connected with the tunnel fire ventilation,The determination of matching scheme of fan equipment is the problem to be solved in the process of tunnel fire ventilation.In order to solve the above problems, based on graph theory, the urban underground traffic connection tunnel is simplified into the form of network diagram, and the mathematical model of fire ventilation network simulation of urban underground traffic connection tunnel is established.On the basis of this, it is a new method to quantitatively describe the ventilation network system of urban underground traffic and tunnel fire by compiling the fire ventilation network program.The specific contents of this paper include: (1) establishing a mathematical model of ventilation network for urban underground traffic and tunnel fire, including ventilation power model, temperature model, heat source model,The heat transfer model of enclosure structure is used to calculate the local resistance coefficient of the complicated structure of the tunnel connected with urban underground traffic by using the method of combining CFD with network simulation.The calculated drag coefficient is taken as the input parameter of the network simulation solution program. The mathematical model of ventilation network simulation of urban underground traffic and tunnel fire is compiled as a calculation program by using matlab.When different ventilation schemes are adopted under the condition of urban underground traffic and tunnel fire, they include the longitudinal ventilation system of jet fan, vertical ventilation system of shaft, semi-transverse ventilation system, natural ventilation system, and so on.The tunnel parameters of various fire ventilation schemes, such as air volume, temperature, pressure and so on, are calculated, and the pressure or flow rate required by ventilation equipment is determined to optimize the ventilation scheme of urban underground traffic associated with tunnel fire.By simulating and calculating the ventilation network of urban underground traffic and tunnel fire, the accurate distribution of flow, temperature, pressure and other parameters in tunnel is obtained, which is helpful to determine the concrete ventilation and smoke removal scheme of tunnel more reasonably.This paper provides a calculation method for other similar engineering tunnels to determine the fire ventilation and smoke exhaust scheme, which can be helpful to the safety and reliability analysis of the fire ventilation scheme.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U458;U453.5

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