Abstract
To explore the influence of the traveling wave parameters on the aerodynamic characteristics of Ahmed models, the geometric model of the traveling wave wall is used as the study object, and the influence of the traveling wave geometric parameters on aerodynamic drag is studied by numerical simulation. A cosine-type traveling wave digital model is established on the basis of Ahmed’s original model. Results show that the static traveling wave structure can play a good role in reducing drag under some driving conditions. The traveling wave’s drag reduction characteristics are affected by the layout position, depth, wavelength, and other related parameters and more affected by driving speed. Finally, a group of working conditions with good drag reduction effects is selected, and the principle of drag reduction by using static traveling wave structure is explained qualitatively and quantitatively through velocity field, shear stress, and pressure field.
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Abbreviations
- A D :
-
The orthographic projection area of the object (m2)
- C D :
-
Aerodynamic drag coefficient
- F D :
-
Aerodynamic resistance of the object in the direction of movement
- L :
-
The length of the plate (m)
- Q :
-
Vorticity equipotential surface
- Re :
-
Reynolds number
- S :
-
Strain rate amplitude
- V ∞ :
-
The relative speed of the synthetic airflow (m/s)
- Ω :
-
Vorticity amplitude
- ρ :
-
Air density (kg/m3)
- δ(L) :
-
Thickness of the boundary layer of the flat plate (m)
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Acknowledgments
Great acknowledgement to the National Natural Science Foundation of China (No.51875238) for supporting this work.
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Wei Lan is a Professor of the College of Automotive Engineering, Jilin University, Changchun, China. Her research interests include aerodynamics, heat transfer, and nanofluids.
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Hu, X., Wang, Z., Li, J. et al. Aerodynamic drag reduction based on static traveling wave structure. J Mech Sci Technol 36, 2379–2386 (2022). https://doi.org/10.1007/s12206-022-0420-3
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DOI: https://doi.org/10.1007/s12206-022-0420-3