تحلیل و مدل‌سازی موج فشاری ایجاد شده در ورود قطار تندرو به تونل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی راه‌آهن، دانشگاه علم و صنعت،تهران

2 استادیار، دانشکده مهندسی راه‌آهن، دانشگاه علم و صنعت ایران، تهران

چکیده

با ورود قطار تندرو به تونل، یک موج فشاری در جلوی قطار به‏وجود می‌آید. همین امر عامل ایجاد پدیده پیستونی در تونل است که تمام جریان هوای درون تونل را تحت تأثیر قرار می‌دهد. این پدیده در بلندمدت باعث مشکلاتی از جمله تخریب لایه‌های دیواره تونل، تهدید امنیت مسافران، تهویه ایستگاه‏های زیرزمینی و حتی در مواردی آسیب به قطار می‌شود. در این پژوهش، این پدیده برای ورود یک قطار از نوع ICE2 به تونل تک­خط مورد بررسی قرار گرفته است. شبیه‌سازی با استفاده از حل عددی در نرم‌افزار محاسبات سیالاتی انسیس فلوئنت، به روش اسلایدینگ مش، به‌صورت سه‌بعدی، تراکم­ناپذیر و مغشوش انجام شده است. برای اطمینان از روش عددی، سرعت جریان درون تونل با یک تست تجربی صحت­سنجی شده است. شبیه‌سازی‌ها برای قطار با سرعت‌های 60، 80 و 100 متر بر ثانیه انجام شده است. نتایج کلی نشان از آن دارد که هر چه سرعت قطار افزایش داده شود، در نتیجه آن، دامنه فشار و سرعت موج هوایی تولید شده افزایش می‌یابد. در نهایت، میزان استحکام شیشه روبروی قطار در مقابل حداکثر موج هوای ایجاد شده مورد مطالعه قرار گرفته و محدوده­ی مجاز سرعت قطار در ورود به تونل قابل برداشت است.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis and Modeling of Pressure Wave at the Entrance of the High-Speed Train to Tunnel

نویسندگان [English]

  • Mehrdad Jafari 1
  • mohammad Reza Talaee 2
1 MSc. Student, School of Railway Engineering, Iran University of Science and Technology, Tehran, I. R. Iran.
2 Assistant Professor, School of Railway Engineering, Iran University of Science and Technology, Tehran, I. R. Iran.
چکیده [English]

When a high-speed train enters into a tunnel, a pressure wave will be created. This leads to piston phenomenon in the tunnel, which affects all air currents in the tunnel. This phenomenon may lead to some problems in the long time like destruction of tunnel wall layers, safety of the passengers, ventilation of the subway stations and disturbing train balance. In this research, this phenomenon was investigated for entering of an ICE2 train to a single-line tunnel. Simulation is performed by using numerical solution in ANSYS Fluent CFD software considering sliding mesh, three-dimensional, incompressible and turbulent flow. The numerical method has been validated with an experimental test for the flow speed in the tunnel. Simulations have been done for 60, 80 and 100 m/s train speeds. Overal results showed that with increasing the train speed, the pressure domain and aerial wave speed will increase too. Finally, the strength of train’s front glass against maximum air wave has been studied and permissible train-speed range for entering the tunnel has been obtained.

کلیدواژه‌ها [English]

  • High-speed train
  • Piston effect
  • Compressive and expansion pressure waves
  • Incompressible flow
  • Sliding mesh

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