Dynamic leg-motion and its effect on the aerodynamic performance of cyclists
Dynamic leg-motion and its effect on the aerodynamic performance of cyclists
复制标题
DOI：
10.1016/j.jfluidstructs.2016.05.007
复制
发表时间：
2016-08-01
影响因子：
3.6
通讯作者：
Sheridan, John
中科院分区：
文献类型：
--
作者：
Crouch, Timothy N.;Burton, David;Sheridan, John
在这个基于风洞的实验研究中，一个通用的解剖学上准确的模型骑自行车的近尾流拓扑结构映射为一系列减少踩踏频率。尾流场的静态腿和蹬自行车手进行了比较，在整个360旋转的曲柄使用时间和相位平均。主要的尾流结构和空气动力的量化和分析下的动态蹬车条件下的精英级计时赛自行车手的代表。在范围内的减少踩踏频率的研究，只有微小的变化被检测到之间的瞬时阻力和主涡流结构的踩踏骑自行车相比，固定骑自行车的踏板在相同的位置。提出了一个简化的模型的气动力作用下的腿的运动提供洞察腿的运动如何影响气动阻力。从这个模型与那些从实验中预测的力量的比较提供了一个新的视角如何骑自行车的空气动力学可能会被优化。(C)2016爱思唯尔有限公司版权所有
In this wind-tunnel based experimental study, the flow topology of the near wake of a generic anatomically accurate model cyclist is mapped for a range of reduced pedalling frequencies. Wake flow fields for both static leg and pedalling cyclists are compared over the full 360 rotation of the crank using both time- and phase-averaging. The primary wake flow structures and aerodynamic forces are quantified and analysed under dynamic pedalling conditions representative of an elite-level time-trial cyclist. Over the range of reduced pedalling frequencies studied, only minor variation was detected between the instantaneous drag and primary vortical structures of a pedalling cyclist compared to a stationary cyclist with the pedals in the same position. A simplified model of the aerodynamic forces acting on the legs under motion is presented to provide insight into how the motion of the legs influences aerodynamic drag. A comparison of predicted forces from this model with those from experiments provides a new perspective on how the aerodynamics of cyclists may be optimised. (C) 2016 Elsevier Ltd. All rights reserved.