摘要
列车外形对列车气动性能起决定性作用。以往常采用长度法定义的长细比(长度长细比)来评估不同头部外形气动性能,这种方法在车身横截面积相同的情况下,致使长度相同外形不同的流线型车头具有相同的长细比而无法进行比较。针对这一情况,对不同外形系列的流线型列车开展了风洞实验研究,在此基础上提出了一组新的列车气动性能评估参数-整体长细比和宽细比。整体长细比考虑了车头流线型部分水平面投影形状(水平长细比)和纵向对称面投影形状(纵向长细比)对空气阻力的影响,宽细比则综合了长度长细比和车头流线型部分水平面投影形状对列车交会压力波的影响。研究结果表明该组评估参数能较好地反映出端车流线型外形对列车气动阻力和交会空气压力波幅值的影响。
The configuration of a train is decisive in its aerodynamic performance. We used to evaluate the aerodynamic performance of cabs with different head shapes using the length slenderness ratio. But this cannot compare the aerodynamic performance of trains, which have the same length of the streamlined head and the same cross section area of the train body but different head shapes. This paper carried out the research of the wind tunnel test on the aerodynamic performance of a streamlined train of different configuration and brought forward a new set of evaluating parameters. These parameters are the total slenderness ratio and the width ratio. The total slenderness ratio includes the influence to the resistance of the horizontal and the longitudinal projection of the streamline part of the train head. The width ratio colligates the influence to the air pressure pulse of the length slenderness ratio and the horizontal projection shape of the streamline part of the train head. The investigation results show these evaluating parameters can reflect the influence of the configuration of streamline end coach to the resistance and the amplitude of air pressure pulse during train operation.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2003年第1期38-42,共5页
China Railway Science
基金
铁道部科技研究开发计划项目(2000G49 B)
