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In order to optimize the underbody flow field of vehicle efficiently and reduce aerodynamic drag, this paper takes a electric vehicle as the research object, and proposes a multivariate joint global optimization method. Firstly, considering the influence of RPR fixturess, the method which combines CFD simulation and wind tunnel test is applied to verify the effectiveness of the initial optimization scheme and the reliability of the analysis method; Then, based on DOE, surrogate model and ASA algorithm,two optimization schemes are used to reduce aerodynamic drag: optimization of front wheel deflector, and joint optimization of front and rear wheel deflector. Finally, wind tunnel tests are conducted for verification. The test results show that, multivariate optimization of front wheel deflector has the best drag reduction effect,the drag coefficient of the optimal scheme is reduced by 5.5% compared to the original model.
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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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