• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 29 Issue 5
Oct.  2016
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Article Contents
YAN Yaguang, YANG Qingshan, LUO Jianjun. Optimizing Flared Hood of Tunnel Based on Aeroacoustics[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 832-839. doi: 10.3969/j.issn.0258-2724.2016.05.003
Citation: YAN Yaguang, YANG Qingshan, LUO Jianjun. Optimizing Flared Hood of Tunnel Based on Aeroacoustics[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 832-839. doi: 10.3969/j.issn.0258-2724.2016.05.003

Optimizing Flared Hood of Tunnel Based on Aeroacoustics

doi: 10.3969/j.issn.0258-2724.2016.05.003
  • Received Date: 24 Sep 2015
  • Publish Date: 25 Oct 2016
  • In order to alleviate the sonic boom caused by aerodynamic effect in a tunnel, design parameters of the tunnel entrance with a flared hood were optimized. By solving the FW-H equation with Green's function, the pressure and pressure gradient of the initial compression wavefront in the tunnel were obtained. Then, the cross-sectional area function, the entrance cross-section area and the length of the flared hood were optimized according to the characteristics of the flared hood. The optimization results show that the peak pressure gradient decreases with an increase in the length of the tunnel hood. Considering economic factors, the optimal length of the flared hood is 10 times the tunnel diameter. With the optimized cross sectional area function and entrance area of the tunnel hood, the curves of pressure present a linear growth, and the peak pressure gradient is reduced by 63.9%. Consequently, the abrupt change of pressure at the tunnel entrance is avoided, and the phenomenon of the micro pressure wave such as sonic boom can be relieved effectively.

     

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