带竖井公路隧道运营通风热位差利用数值模拟

发布时间：2018-04-11 16:45

本文选题：集中排风 + 集中送风　；参考：《长安大学》2015年硕士论文

【摘要】：在带竖井的长大深埋公路隧道中,经常会遇到氋地温问题,其引起的热位差对隧道通风存在较大的影响。隧道热位差研究不够,会造成隧道通风设计上的不合理,导致隧道运营过程中能耗严重或通风不足。因此,为了正确认识隧道运营过程中热位差的作用,从而有效利用热位差,有必要对长大隧道热位差的变化规律进行研究,以便优化隧道通风方案达到节能降耗的目的。本文在总结国内外现有研究的基础上,围绕隧道竖井内热位差的变化规律,基于Fluent软件对长大隧道运营通风进行了数值模拟分析,并开展了以下研究工作:1.介绍了隧道通风数值模拟中流体力学的几个控制方程,对比分析了Fluent软件的三类基本湍流模型,针对靠近壁面区域的计算分析,选用标准k-ε双方程模型,分析了风流与隧道围岩的热交换过程,在Fluent软件中打开能量方程。进行了隧道热位差计算和数值模拟的对比分析,验证了Fluent软件对热位差变化规律进行数值模拟的可行性。2.利用Fluent软件模拟了热位差和轴流风机对单竖井隧道集中排(送)风的影响,分析了环境温度对隧道内空气温度、密度和流态变化的影响,提出了对向公路隧道冬季集中排风和夏季集中送风的通风方案。3.利用Fluent软件对单向单竖井隧道进行了正常运营通风的数值模拟,分析了单向单竖井隧道内排风井和送风井热位差的变化规律,得出了隧道运营通风优化方案:冬季排风井内轴流风机部分开动,适当减少隧道排风段射流风机开启数量,且适当增加隧道送风段射流风机开启数量,避免出洞口处污染物集聚不易排出。4.利用Fluent软件对单向双竖井公路隧道进行了热位差利用的数值模拟分析,结合单向单竖井隧道热位差变化的数值模拟结果进行了全面分析,提出了无论是否考虑交通风压,单向隧道处于排送组合通风状态时,单向双竖井隧道的通风规律等效于两个单向单竖井隧道通风规律叠加,从侧面验证了特长隧道纵向分段式通风的合理性。
[Abstract]:In long and deep buried highway tunnel with shaft, the problem of ground temperature is often encountered, and the heat potential difference caused by it has a great influence on the ventilation of the tunnel.Insufficient research on tunnel thermal potential difference will lead to unreasonable ventilation design and serious energy consumption or insufficient ventilation during tunnel operation.Therefore, in order to correctly understand the role of thermal potential difference in tunnel operation and make effective use of thermal potential difference, it is necessary to study the variation law of thermal potential difference of long and long tunnel, in order to optimize the ventilation scheme of tunnel to achieve the purpose of saving energy and reducing consumption.On the basis of summing up the existing researches at home and abroad, this paper analyzes the operating ventilation of long and long tunnels by numerical simulation based on Fluent software around the variation law of thermal potential difference in tunnel shaft, and carries out the following research work: 1.This paper introduces several governing equations of hydrodynamics in numerical simulation of tunnel ventilation, compares and analyzes three basic turbulence models of Fluent software, and selects the standard k- 蔚 two-equation model for the calculation and analysis of the area near the wall.The heat transfer process between wind flow and surrounding rock of tunnel is analyzed, and the energy equation is opened in Fluent software.The comparison and analysis of tunnel thermal potential difference calculation and numerical simulation are carried out, and the feasibility of numerical simulation of thermal potential difference variation rule by Fluent software is verified.The effects of heat potential difference and axial flow fan on the centralized ventilation in a single shaft tunnel are simulated by using Fluent software. The effects of ambient temperature on the air temperature, density and flow state in the tunnel are analyzed.The ventilation scheme of centralized ventilation for highway tunnel in winter and summer is put forward.The numerical simulation of normal operating ventilation of unidirectional single shaft tunnel is carried out by using Fluent software, and the variation law of heat potential difference between exhaust well and air supply well in unidirectional single shaft tunnel is analyzed.The optimization scheme of tunnel operation ventilation is obtained: in winter, the axial flow fan in the ventilation well is partially started, the number of jet fan opening in tunnel exhaust section is reduced appropriately, and the number of jet fan opening in tunnel air supply section is increased appropriately.Avoid the accumulation of pollutants at the entrance of the hole is not easy to discharge. 4.The thermal potential difference of one-way double-shaft highway tunnel is simulated and analyzed by using Fluent software. Combined with the numerical simulation results of one-way single-shaft tunnel thermal potential difference, the paper puts forward whether the traffic wind pressure is considered or not.When the unidirectional tunnel is in the state of draining combined ventilation, the ventilation law of the unidirectional double-shaft tunnel is equivalent to the superposition of the ventilation law of the two unidirectional single-shaft tunnels, which verifies the rationality of the longitudinal segmental ventilation of the super-long tunnel from the side.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U453.5

【共引文献】