...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tunnelling and underground space technology >Proposing a general formula to calculate the critical velocities in tunnels with different cross-sectional shapes
【24h】

Proposing a general formula to calculate the critical velocities in tunnels with different cross-sectional shapes

机译：提出一种用不同的横截面形状计算隧道中的临界速度的通式

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Among the parameters affecting the critical velocity in tunnel fires, the tunnel cross-sectional shape could significantly affect the tunnel fire characteristics, mainly due to the wall-bounded physics of the tunnel fire. Previously, the effects of the cross-sectional geometry of the tunnel were calculated using the non-dimensional analysis and hydraulic height of the tunnel. The dimensionless analysis using hydraulic height calculates only the effects of the tunnel sizes and does not capture the effects of the shape of the tunnel cross-section. Developing a 3D computational fluid dynamics tool using the body-fitted grids, the critical velocities are calculated for the 7 different cross-sectional shapes of tunnels, including the curved shape and the rectangular shape cross-sections, to precisely find the effects of the tunnel cross-sectional shape. The shape coefficient of the tunnel cross-section (area of the tunnel cross-section divided by the square of its height) is used as a tuning factor to correlate the results of the different cross-sectional shapes. Also, a modified formula is proposed to calculate the critical velocity of any arbitrary cross-sectional shape of the tunnel. Finally, the proposed formula is validated using the benchmark data. A series of recommendations in tunnel fires are provided using the proposed formula.
机译：在影响隧道火灾中的临界速度的参数中，隧道横截面形状可能会显着影响隧道火灾特性，主要是由于隧道火的壁有限的物理学。以前，使用隧道的非尺寸分析和液压高度来计算隧道的横截面几何形状的效果。使用液压高度的无量纲分析仅计算隧道尺寸的效果，并且不会捕获隧道横截面形状的效果。使用主体拟合栅格开发3D计算流体动力学工具，针对隧道的7种不同的横截面形状计算临界速度，包括弯曲形状和矩形横截面，以精确地找到隧道的效果横截面形状。隧道横截面（隧道横截面的面积除以其高度的平方）的形状系数用作调谐因子，以将不同的横截面形状的结果相关联。而且，提出了一种改进的公式来计算隧道的任何任意横截面形状的临界速度。最后，使用基准数据验证所提出的公式。使用所提出的公式提供隧道火灾中的一系列建议。

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号