19363

۱۹۳۶۳

تحليل و مدلسازي پارامترهاي شكل دماغه قطار پرسرعت تحت اثر باد عرضي

كارشناسي ارشد

ماشين‌هاي ريلي

۹۴-۹۷

۱۳۹۷/۴/۲۷

دكتر محمدرضا طلائي

راه آهن

1397/06/24

analysis and modeling of high-speed train nose shape parameters under crosswind

9/22/2020 12:00:00 AM

Abstract: In recent years, increasing speed and reducing weight of railway vehicles has raised concerns about the risk of instability and overturning of these vehicles. Blowing crosswind is an affective factors in overturning and derailment, when accompanied with speed of high-speed trains, increase risk of overturning and derailment. Unlike other researches that considering only two variables(relative wind speed and relative wind blowing angle); in this study, numerical simulation of crosswind induced air flow around an ICE2 train model, performed by considering three variables(train speed, wind speed and wind blowing angle), with aid of RANS equations of computational fluid dynamic and aerodynamic coeffecients obtained. This method specify portion of wind speed and train speed on unstability of train motion, separately. Critial range of train motion determined by this results. Then, 8 new nose shape generated by considering 5 geometerical parameters and apply on basic geometery (ICE2 aerodynamic train model). Effect of change geometrical parameters reported by comparisoning of these 9 geometeries aerodynamic coefficients and reasons explained. Investigations showed among considered geometrical parameters, reducing nose thickness and increasing nose length is more favorable than reducing nose width and increase nose tip hight have unfavorable effect on train motion stability. Keywords: train aerodynamics- crosswind- stability of movement- overturnning