کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4924847 | 1431097 | 2017 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of ambient wind on aerodynamic performance when two trains intersect inside a tunnel
ترجمه فارسی عنوان
تاثیر باد محیط بر عملکرد آیرودینامیک زمانی که دو قطار در داخل یک تونل در حال تقاطع هستند
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کلمات کلیدی
باد محیطی، تقسیم موج فشار پیش و عقب زمان، ضریب نیرو،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
In this study, the aerodynamic performance of two trains that intersect inside a tunnel under ambient wind conditions is investigated. A full-scale test is conducted to verify the computational method and mesh, and then a series of numerical simulations are performed to investigate the pressure variation and the aerodynamic force coefficient by comparing with the condition of no ambient air. The difference between the results with/without ambient wind in a tunnel is analysed. The results indicate that if Train A travels downwind, the positive pressure of train surface increases and the negative pressure decreases as the wind velocity increases, and the arrival time of the maximum positive pressure lags on average 0.024Â s and 0.058Â s for wind velocities of 20Â m/s and 40Â m/s, respectively. For the tunnel wall measuring points, the maximum positive pressure increases as the wind velocity increases. The maximum drag coefficient of downwind Train A decreases by 4.7% and 10.1% for wind velocities of 20Â m/s and 40Â m/s, respectively, whereas that of upwind Train B increases by 5.7% and 15.8%, respectively. The maximum positive side force coefficient of downwind Train A increases by 20.8% for an ambient wind velocity of 40Â m/s, whereas the same coefficient decreases by 16.7% for upwind Train B.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Wind Engineering and Industrial Aerodynamics - Volume 169, October 2017, Pages 139-155
Journal: Journal of Wind Engineering and Industrial Aerodynamics - Volume 169, October 2017, Pages 139-155
نویسندگان
Zhengwei Chen, Tanghong Liu, Xisai Zhou, Jiqiang Niu,