升力翼高速列车前后翼干扰特性研究OA北大核心CSTPCD
Interference characteristics of front and rear wings of high-speed train with lift wing
在高速列车车顶安装升力翼旨在通过提高列车气动升力减小轮轨作用力,是一种新型等效减重的手段.升力翼安装到高速列车顶部后,其工作环境与航空相比有很大不同,升力翼与升力翼之间存在相互干扰.以三车编组1꞉10缩比某型CRH高速列车模型为研究对象,采用改进型延迟分离涡模拟(IDDES)方法,分别针对不同高度和不同间距布局的两翼高速列车进行数值模拟分析,探讨前后升力翼布局对升翼力列车气动力和周围流场结构的影响规律及其作用机理.研究结果表明:对于不同间距布局,当后翼距离前翼过近时,前翼翼尖涡流的干扰导致流速加大,压差变小,最终使气动升力有所降低;而当前后翼间距过大时,即后翼远离前翼尾流干扰范围,后翼由于无法受到前翼下洗气流的正向作用,使得升力减小.对于不同高度布局,错落式布局下前翼的尾流涡旋由于高度差的原因远离后翼,相较于等高式布局,错落式布局中前翼尾流对后翼造成的干扰程度较小.错落式布局的列车整体升力性能优于等高式布局的列车整体升力性能,且前低后高式布局下,列车的增升效果最好.综合不同间距和不同高度布局的结果可知,对于两翼高速列车,翼间距为0.90H时前低后高式布局的整车气动性能最优,尤其是列车升力可以得到显著提升.
The installation of the lift wing on the roof of a high-speed train aims to reduce the action force of wheel and rail by increasing the pneumatic lift of the train,which is a new equivalent weight loss method.After the lift wing is mounted on the top of the high-speed train,the working environment is very different from that of aviation,and there is mutual interference between lift wings.The 1:10 ratio of CRH high-speed train model was studied,and the improved delay separation vortex simulation(IDDES)method was used to conduct numerical simulation analysis of the two-wing high-speed train with different wing heights and different wing spacings.The effects of the wing layout on the air dynamics and the surrounding flow field structure around the train were discussed.The results show that for different spacing layout,when the rear wing is too close to the front wing,the flow velocity is increased,the pressure difference becomes smaller,and the aerodynamic lift is reduced.When the rear wing spacing is too large,the rear wing is far away from the interference range of the front wing wake,the rear wing cannot be subjected by the forward airflow under the front wing,so the lift force is reduced.For different height layout,the wake vortex of the front wing with the scattered layout is far away from the rear wing due to the height difference.Compared with the elevation layout,the front wing tail of the scattered layout causes less interference to the rear wing.In terms of aerodynamic force,the overall lift performance of the train with scattered layout is better than that of the equal height layout,and with the front low and rear high type layout,the increase effect of the train is the best.Based on the results of different spacings and different height layout,it is finally determined that for the two-wing high-speed trains,the aerodynamic performance of the whole vehicle with the front low and rear high layout with the wing spacing of 0.90H is optimal,especially the lift of the train can be significantly improved.
张宝珍;熊小慧;汪欣然;耿嘉旭
重载快捷大功率电力机车全国重点实验室,湖南株洲,412000||中车株洲电力机车有限公司,湖南株洲,412000中南大学轨道交通安全教育部重点实验室,湖南长沙,410075||中南大学轨道交通列车安全保障技术国家地方联合工程研究中心,湖南长沙,410075
交通运输
高速列车升力翼翼间干扰特性计算流体力学
high-speed trainlift winginter wing interference characteristicscomputational fluid dynamics
《中南大学学报（自然科学版）》 2024 (005)
1806-1821 / 16
国家重点研发计划项目(2020YFA0710903)(Project(2020YFA0710903)supported by the National Key R&D Program of China)
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