中南大学学报（自然科学版）2023，Vol.54Issue(12)：4917-4932,16.DOI:10.11817/j.issn.1672-7207.2023.12.028
车轮对方背汽车双稳态非定常尾迹特性的影响
Effects of wheels on bi-stable wake of a square-back automotive
摘要
Abstract
The long-time scale bi-stable wake of the square-back vehicle with and without wheels was numerically studied using improved-delayed detached eddy simulation.Several switches of bi-stable wake were successfully captured and the impact of wheels on the wake was analyzed in detail based on both time-averaged and instantaneous flow field.Then,the dominant modes of the instantaneous base pressure and wake flow field were extracted by the proper orthogonal decomposition(POD)method.And low-order mode reconstruction model was applied to investigate the dynamic evolution of the bi-stable wake.The results show that the wheels can enhance the wake upwash,leading to the lower base pressure in the bottom of the base.The POD mode energy fraction of the Lateral-Reflection Symmetry Breaking mode representing the bi-stable wake is significantly reduced by the wheels,while the energy proportion of the vertical asymmetric mode greatly increases.The vortex pair generated by the flow separation from the side of the rear wheel has a destructive effect on the asymmetric steady state maintained by the bi-stable wake,promoting the rapid and modest swing of the wake.关键词
方背体汽车/车轮/双稳态尾迹/本征正交分解Key words
square-back vehicle/wheels/bi-stable wake/proper orthogonal decomposition分类
交通工程引用本文复制引用
杨志刚,余磊,夏超,范亚军,任静..车轮对方背汽车双稳态非定常尾迹特性的影响[J].中南大学学报（自然科学版）,2023,54(12):4917-4932,16.基金项目
国家重点研发计划项目(2022YFE0208000) （2022YFE0208000）
国家自然科学基金资助项目(52372360) （52372360）
上海市地面交通工具空气动力与热环境模拟重点实验室项目(23DZ2229029)(Project(2022YFE0208000)supported by the National Key Research and Development Program of China （23DZ2229029）
Project(52372360)supported by the National Natural Science Foundation of China （52372360）
Project(23DZ2229029)supported by the Shanghai Key Laboratory of Aerodynamics and Thermal Environment Simulation for Ground Vehicles) （23DZ2229029）
