气候变化领域集成服务门户(CCPortal): Aerodynamic integration produces a vehicle shape with a negative drag coefficient

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DOI	10.1073/pnas.2106406118
	Aerodynamic integration produces a vehicle shape with a negative drag coefficient
	Salari K.; Ortega J.M.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:27
英文摘要	Negative drag coefficients are normally associated with a vessel outfitted with a sail to extract energy from the wind and propel the vehicle forward. Therefore, the notion of a heavy vehicle, that is, a semi truck, that generates negative aerodynamic drag without a sail or any external appendages may seem implausible, especially given the fact that these vehicles have some of the largest drag coefficients on the road today. However, using both wind tunnel measurements and computational fluid dynamics simulations, we demonstrate aerodynamically integrated vehicle shapes that generate negative body-axis drag in a crosswind as a result of large negative frontal pressures that effectively “pull” the vehicle forward against the wind, much like a sailboat. While negative body-axis drag exists only for wind yaw angles above a certain analytical threshold, the negative frontal pressures exist at smaller yaw angles and subsequently produce body-axis drag coefficients that are significantly less than those of modern heavy vehicles. The application of this aerodynamic phenomenon to the heavy vehicle industry would produce sizable reductions in petroleum use throughout the United States. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Aerodynamics; Computational fluid dynamics; Drag; Wind tunnel
语种	英语
scopus关键词	analytical parameters; Article; computational fluid dynamics; dynamics; motor vehicle; physical parameters; statistical analysis; United States; wind
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238491
作者单位	Lawrence Livermore National Laboratory, Livermore, CA 94551, United States
推荐引用方式 GB/T 7714	Salari K.,Ortega J.M.. Aerodynamic integration produces a vehicle shape with a negative drag coefficient[J],2021,118(27).
APA	Salari K.,&Ortega J.M..(2021).Aerodynamic integration produces a vehicle shape with a negative drag coefficient.Proceedings of the National Academy of Sciences of the United States of America,118(27).
MLA	Salari K.,et al."Aerodynamic integration produces a vehicle shape with a negative drag coefficient".Proceedings of the National Academy of Sciences of the United States of America 118.27(2021).