کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10225454 1701178 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of yaw angle on the unsteady aerodynamic performance of the pantograph of a high-speed train under crosswind
ترجمه فارسی عنوان
اثرات زاویه نورد در عملکرد نزولی آیرودینامیکی پانتوگراف یک قطار سرعت بالا تحت صخره
کلمات کلیدی
قطار سریع السیر، پانتوگراف، زاویه یوغ، عملکرد ناگهانی آیرودینامیکی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
In this study, the delayed detached eddy simulation approach based on the shear-stress transport κ-ω turbulent model was performed to simulate the unsteady aerodynamic performance of the pantograph of a high-speed train using yaw angles of 0°, 10°, 20°, and 30° with crosswind to determine how the yaw angle influenced the numerical simulation results. For validation, the simulation results were compared with wind tunnel test results, demonstrating good agreement. Additionally, the aerodynamic forces and instantaneous and time-averaged flow fields around the pantograph were analyzed. With increasing yaw angle, the flow field asymmetry and vortex intensity near the pantograph increased, the wake flow became more turbulent, and the unsteady aerodynamic characteristics became more obvious. Thus, the yaw angle affected the velocity field distribution near the pantograph considerably, especially in the wake flow area. The aerodynamic forces on the pantograph were also computed, and their time histories were used to reveal the characteristic frequencies of the flow motion around the pantograph. The time-averaged aerodynamic coefficients and their fluctuations increased with increasing yaw angle. In addition, the power spectral densities of the aerodynamic coefficients exhibited obvious peaks, while the aerodynamic coefficient frequency band was wider with crosswind than without crosswind.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Wind Engineering and Industrial Aerodynamics - Volume 182, November 2018, Pages 49-60
نویسندگان
, , , ,