| 曹远龙,张凯歌,谢小平,王晨辉.侧风状态下重型卡车气动性能研究[J].南华大学学报(自然科学版),2023,(1):78~86.[CAO Yuanlong,ZHANG Kaige,XIE Xiaoping,WANG Chenhui.Research on Heavy Truck Aerodynamic Characteristics Under Crosswind[J].Journal of University of South China(Science and Technology),2023,(1):78~86.] |
| 侧风状态下重型卡车气动性能研究 |
| Research on Heavy Truck Aerodynamic Characteristics Under Crosswind |
| 投稿时间：2022-10-05 |
| DOI：10.19431/j.cnki. 1673-0062.2023.01.012 |
| 中文关键词: 重型卡车 空气动力学 侧风 减阻导流装置 |
| 英文关键词:heavy truck aerodynamic cross wind diversion devices of drag reduction |
| 基金项目:湖南省自然科学基金项目(2021JJ40443);南华大学校级教研与教改项目(202JXJ015) |
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| 中文摘要: |
| 为了研究侧风状态对重型卡车气动性能的影响,建立计算流体动力学模型研究不同横摆角下卡车外流场的变化,随后提出添加横向和纵向隔板作为减阻导流装置,分析两种结构对卡车气动特性的影响,并通过1∶7.5卡车比例模型的风洞试验验证数值仿真模型的有效性。结果表明:侧风状态下重型卡车的风阻、侧向力和升力系数均随横摆角的增大而增大;在货箱前部添加横向或纵向隔板能够切断货箱前方间隙内流体的连续性,能不同程度地降低侧风状态下卡车的风阻系数。与添加纵向隔板相比,添加横向隔板的减阻效果更加明显,横摆角为12°时相对于原车模型的风阻系数下降率可达19.6%。但两种结构对侧向力系数和升力系数的影响很小,说明两种减阻结构在提升燃油经济性的同时,也可保证行车安全性。 |
| 英文摘要: |
| To study the effect of crosswind on heavy truck aerodynamic characteristics, a computational fluid dynamics model is established to study the changes of the truck's outflow field under different yaw angles. Then, the lateral and longitudinal partitions are proposed as diversion devices of drag reduction. The influence of the two structures on the aerodynamic characteristics of trucks is analyzed. The effectiveness of the numerical simulation model is verified by the wind tunnel test of a 1∶7.5 truck scale model. The results show that the drag coefficient, lateral force and lift force of heavy trucks increase with the increase of yaw angle under crosswind. Adding lateral or longitudinal partitions to the front of the cargo compartment can cut off the continuity of fluid in the clearance between the cab and the cargo compartment, and reduce the drag coefficient of the truck under crosswind to different degrees. Compared with the longitudinal partition, the drag reduction effect of adding the transverse partition is more obvious. When the yaw angle is 12°, the reduction rate of the drag coefficient of the truck model with transverse partition is 19.6% compared with that of the original model. However, the two structures adding to truck model have little influence on the coefficients of lateral force and lift force, indicating that the two drag reduction structures can not only improve fuel economy, but also ensure driving safety. |
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