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Computational study of effects of jet fans on the ventilation of a highway curved tunnel

机译：喷气机风扇对公路弯道通风影响的计算研究

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摘要

A computational study was carried out to investigate the aerodynamic behavior of jet fans in a curved road tunnel and its effects on the tunnel ventilation system. It has been found that the variations of the static and dynamic pressure in a curved tunnel are non-monotonic. After the issue of the jets, the pressure initially increases gradually, but this is followed by a sudden drop and then a recovery. This is attributed to the interaction between the jets and the curved walls of the tunnel. A sudden increase in pressure is resulted as the jet reaches the convex wall, whereas that the concave wall is approached causes a pressure reduction. The flow becomes asymmetrical downstream of the jets. The development of the jets depends on the separation of the fans and the distance between the fans and the tunnel walls. Increasing the space between the fans or moving them away from the tunnel ceiling makes the jets spreading more quickly across the cross-section. However, it takes a longer distance for the jets to develop when the fans are close to each other or to the tunnel wall. The distance required for pressure to be fully recovered is approximately 90-120 m in this study. The biggest pressure-rising coefficient is obtained when the fans are arranged according to the distance of 2.4 m between the fans, the fans offset of 0.5 m from the centre line towards the convex wall, and the ratio of the distance between fans and the ceiling to the diameter of fans of 1.77.
机译：进行了计算研究，以研究弯道隧道中喷气风扇的空气动力学行为及其对隧道通风系统的影响。已经发现，弯曲隧道中的静压力和动压力的变化是非单调的。射流释放后，压力开始逐渐增加，但随后突然下降，然后恢复。这归因于射流与隧道的弯曲壁之间的相互作用。当射流到达凸壁时会导致压力突然增加，而接近凹壁会导致压力降低。气流在射流的下游变得不对称。射流的发展取决于风扇的间隔以及风扇与隧道壁之间的距离。增大风扇之间的空间或将风扇从隧道顶棚移开，可使喷嘴在横截面上的扩散速度更快。然而，当风扇彼此靠近或靠近隧道壁时，射流形成需要更长的距离。在这项研究中，压力完全恢复所需的距离约为90-120 m。当根据风扇之间的距离为2.4 m，风扇从中心线向凸壁的距离为0.5 m以及风扇与天花板之间的距离之比来布置风扇时，可获得最大的升压系数。到风扇直径1.77。

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  • 来源
    《Tunnelling and underground space technology》 |2010年第4期|p.382-390|共9页
  • 作者

    Feng Wang; Mingnian Wang; S. He; Jisheng Zhang; Yuanye Deng;

  • 作者单位

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK;

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;

    School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK;

    School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK;

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    curved tunnel; jet fans; CFD; velocity field; pressure-rise coefficient;

    机译：弯曲的隧道喷气风扇差价合约速度场压力上升系数;

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