World Journal of Engineering Research and Technology

He-Chao Guo, Zhi-Yang Zhao, Meng-Xi Hu, Shu-Xian Shi, Shen Chen

ABSTRACT

To address the problem that the regulation mechanism of deflectors onthe flow field of van-type trucks under a wide range of wind speedoperating conditions remains unclear, this paper adopts the standardRNG k–ε turbulence model to perform numerical calculations on theexternal flow field of van-type trucks with and without deflectorsunder three typical wind speeds, and systematically analyzes theregulation mechanism of the deflector device on flow fieldcharacteristics. The results show that high stagnation pressure exists onthe windward surface of the truck without deflectors, which increasessharply with rising wind speed; after the installation of deflectors, thepressure gradient transitions smoothly, thus reducing aerodynamicdrag. Without deflectors, the velocity gradient between the lowdynamic pressure regions at the cab and the front of the cargo compartment and the highdynamic pressure regions at the cab corners increases significantly with wind speed. Thedeflectors effectively eliminate the low dynamic pressure region at the cab roof, but have alimited improvement effect on the high dynamic pressure acceleration effect of lateral bypassflow. For the truck without deflectors, the total pressure deficit in the wake region is severe,and the energy dissipation increases non-linearly and sharply. The deflector device reducespart of the irreversible energy dissipation by reducing direct flow impingement.

[Full Text Article] [Download Certificate] https://doi.org/10.5281/zenodo.19343373