长大公路隧道通风系统局部结构优化研究

发布时间：2018-11-09 08:05

【摘要】：经过近十多年来科研人员的不懈努力,我国在公路隧道通风方面取得了丰硕的研究成果。但是也存在着一些不足,如对于纵向通风系统中有关细部结构——排(送)风口、三通、风机房扩压、缩压段等的局部阻力损失系数在《公路隧道通风细则》(JTG/T D70/2-02-2014)中虽有涉及但不完善。所以,对于长大公路隧道通风系统局部结构的优化研究很有必要。本文以公路隧道分段纵向通风系统为对象,以局部阻力损失系数为度量标准,对通风系统中的局部结构进行系统数值模拟研究。论文首先对影响纵向通风系统三通局部阻力损失系数的因素(倾斜角度、主支流面积比、主支流流量比、形状)进行了研究,分析了上述参数对其影响程度,给了最佳参数组合。其次,对突扩、突缩、渐扩和渐缩四种不同类型的风道,分别分析了截面形状、前后截面积比及倾斜角度等参数对局部阻力损失系数的影响,给出了最佳参数组合。再次,分析了弯曲角度、弯道直径、弯曲半径及形状等参数对弯曲风道局部阻力损失系数的影响,并给出了相应的优化参数。最后,结合相似工程的现场测试,对新二郎山公路隧道通风系统中的渐扩、渐缩风道及弯曲风道等细部结构,提出了优化建议。
[Abstract]:Through the unremitting efforts of researchers in the past ten years, China has made great achievements in highway tunnel ventilation. But there are some shortcomings, for example, for the longitudinal ventilation system about the details of the air outlet, the three links, the fan room, the expansion of pressure, The local resistance loss coefficient of the reduced pressure section is involved in the ventilation rules of Highway Tunnel (JTG/T D70 / 2-02-2014), but it is not perfect. Therefore, it is necessary to optimize the local structure of ventilation system of long road tunnel. In this paper, a systematic numerical simulation study on the local structure of the ventilation system is carried out by taking the local resistance loss coefficient as the measurement standard and the segmented longitudinal ventilation system of the highway tunnel as the object. In this paper, the factors influencing the local resistance loss coefficient of longitudinal ventilation system (inclination angle, main tributary area ratio, main tributary flow ratio, shape) are studied, and the influence degree of the above parameters on them is analyzed. The optimal parameter combination is given. Secondly, for four different types of wind ducts, such as sudden expansion, sudden contraction, gradual expansion and gradual contraction, the effects of cross-section shape, front and rear cross-sectional area ratio and tilt angle on the local drag loss coefficient are analyzed respectively, and the optimum parameter combination is given. Thirdly, the influence of bending angle, bend diameter, bending radius and shape on the local resistance loss coefficient is analyzed, and the corresponding optimization parameters are given. Finally, combined with the field test of similar projects, the paper puts forward some optimization suggestions for the detail structures of the ventilation system of the new Erlangshan highway tunnel, such as the gradual expansion, the gradually shrinking air passage and the curved air passage, etc.
【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

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