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Outline
To address the diverse usage scenarios of light-duty trucks for overseas users, the study selects typical user usage scenarios in representative overseas markets and systematically investigates the aerodynamic characteristics of light-duty trucks with different cargo heights and body styles. A numerical model of the external flow field of a light-duty truck is established based on the Computational Fluid Dynamics (CFD) method, and simulations are carried out under the operating condition of 90 km/h. The effects of different body styles on the overall aerodynamic drag, surface pressure distribution, and rear wake vortex structures are comparatively analyzed. The results indicate that the height difference between the cab and the cargo body is a primary factor influencing pressure drag, and the installation of an air deflector is an important means of improving high-speed fuel economy. Finally, it is recommended that high-capacity drop-side cargo bodies be prioritized in regions with lower average vehicle speeds, while aerodynamically optimized enclosed van body configurations be adopted in European and Middle Eastern regions with well-developed highway networks.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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