摩托车空气动力翼套件的数值研究

IF 1.5 4区 工程技术 Q3 MECHANICS
Han Chien, Chin-Cheng Wang
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引用次数: 0

摘要

本研究旨在设计赛车摩托车空气动力翼套件(AWK)的配置,以实现最高的下压力-阻力比。数值研究涉及一辆直线行驶的摩托车,AWK 通过产生下压力来防止升力,从而提高性能和安全性。AWK 的几何形状使用跨度为 0.6 米的 NACA 4412 翼面。计算网格使用 SnappyHexMesh 生成,并安装在简化的摩托车上,以尽量减少网格偏斜。使用 RANS k-ω SST 和 LES 湍流模型,用 OpenFOAM CFD 解决 Navier-Stokes 方程。案例 1 比较了带假人和不带假人的摩托车,两者都配备了 AWK,攻角 (AoA) 从 0 度到 -41 度不等。案例 2 研究了在不同风速(即 20、60 和 100 米/秒)下的单翼,以确定在 -37 度 AoA 时的最大下压力-阻力比。这些结果是案例 3 的基础,案例 3 研究了固定上翼和旋转下翼的非平行翼配置。在情况 4 中,上翼和下翼作为平行翼同时旋转,下压力-阻力比峰值出现在-41 度的 AoA 上。最后,情况 5 将情况 4 中平行翼-41 度的 AoA 修改为闭翼版本,以符合 FIM 的安全规定。利用 LES 湍流模型,可以使用 Q 准则直观地显示非稳定和复杂的湍流结构。无翼和闭翼配置的时间平均升力系数比较显示,下压力增加了约 360%。因此,AWK 的普及将有助于提高摩托车赛车的驾驶安全性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Study of Motorbike Aerodynamic Wing Kit
This study aims to design the configuration of an aerodynamic wing kit (AWK) on a racing motorbike to achieve the highest downforce-to-drag ratio. The numerical study involves a motorbike traveling in a straight line, where the AWK improves performance and safety by generating downforce to prevent lift. The geometry of the AWK uses a NACA 4412 airfoil with a span of 0.6 m. The computational mesh is generated using SnappyHexMesh and installed on a simplified motorbike to minimize the mesh skewness. The Navier–Stokes equations are solved with OpenFOAM CFD using the RANS k-ω SST and LES turbulence models. Case 1 compares a motorbike with and without a dummy, both equipped with the AWK varying the angle of attack (AoA) from 0 to -41 degrees. Case 2 studies the single wing at different wind speeds (i.e. 20, 60, and 100 m/s) to determine the highest downforce-to-drag ratio at an AoA of -37 degrees. These results serve as the basis for Case 3, which investigates non-parallel wing configurations with a fixed upper wing and a rotating lower wing. In Case 4, where both upper and lower wings rotate simultaneously as parallel wings, the peak downforce-to-drag ratio occurs at an AoA of -41 degrees. Finally, Case 5 modifies the AoA of -41 degrees of the parallel wing of Case 4 to a closed-wing version to comply with FIM safety regulations. With the LES turbulence model, unsteady and complex turbulence structures can be visualized using the Q-criterion. A comparison of the time-averaged lift coefficient between the wingless and closed-wing configurations shows an increase in downforce of approximately 360%. Subsequently, the popularity of AWK will contribute to the safety of racing motorbike driving.
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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