Experimental investigations on the effects of longitudinal groove fabric for drag reductions on a track cyclist

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Chuntai Zheng, Peng Zhou, Jiaqi Mao, Xin Zhang
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引用次数: 0

Abstract

The previous study has shown that the longitudinal groove fabric can reduce drag forces on a circular cylinder by forcing a drag crisis (Zheng et al. 2021). In this study, the effects of the longitudinal groove fabric are investigated on a full-scale track cycling mannequin. The force measurement results show that the longitudinal groove fabric on the upper arms can achieve a maximum drag reduction of about 7% at a flow speed of 17 m/s, and its control effects depend on flow speeds. Large-scale particle image velocimetry measurements further show that the drag reductions on the upper arm are characterized by diminished streamwise velocity deficits. The control effects also vary on different spanwise locations of the arm, where the flow behaves distinctively. The measurements also reveal the distinct flow dynamics at different heights, i.e., wake interactions and swirling motions, showing the complexity of reducing drag forces from a track cyclist.

Abstract Image

纵向沟槽织物对轨道自行车运动员减少阻力效果的实验研究
之前的研究表明,纵向沟槽织物可以通过强迫阻力危机来减少圆柱体上的阻力(Zheng 等人,2021 年)。在本研究中,纵向沟槽织物在全尺寸场地自行车人体模型上的效果进行了研究。测力结果表明,在流速为 17 米/秒时,上臂的纵向沟槽织物可实现最大约 7% 的阻力减小,其控制效果取决于流速。大尺度粒子图像测速测量进一步表明,上臂阻力减少的特点是流向速度缺陷减小。控制效果还因上旋臂的不同跨度位置而异,这些位置的气流表现各不相同。测量结果还显示了不同高度上的不同流动动态,即尾流相互作用和漩涡运动,显示了减少赛道自行车阻力的复杂性。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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