| URN | etd-0119126-140848 | Statistics | This thesis had been viewed 18 times. Download 2 times. |
| Author | Lin-Ya Syu | ||
| Author's Email Address | No Public. | ||
| Department | Institute Of Mechanical Engineering | ||
| Year | 2025 | Semester | 1 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 56 |
| Title | Application and Performance Analysis of Truck Rear Diffusers on Van-Type Vehicles | ||
| Keyword | |||
| Abstract | This study investigates the feasibility and aerodynamic benefits of applying a rear container-truck spoiler to a van-type vehicle in order to reduce aerodynamic drag caused by wake vortices during driving. A Mercedes-Benz Sprinter was selected as the baseline vehicle. Three-dimensional models of the vehicle body and rear spoiler were constructed using Creo Parametric, and computational fluid dynamics (CFD) simulations were conducted using ANSYS Fluent to analyze the external flow characteristics at a driving speed of 72 km/h (20 m/s). A total of twenty-one configurations were evaluated, considering various spoiler angles of attack (−5¢X¡B0¢X¡B5¢X¡B10¢X¡B15¢X¡B20¢Xand 25¢X) and spoiler lengths (10, 20, and 30 cm). The drag force and drag coefficient were compared among all configurations. The results indicate that the aerodynamic performance of the spoiler is highly dependent on its geometric parameters and exhibits a non-linear relationship. Insufficient angles of attack or overly short spoiler lengths tend to intensify wake vortices at the rear of the vehicle, resulting in increased aerodynamic drag. Among all configurations, the spoiler with a 20¢X angle of attack and a length of 20 cm demonstrated the most significant drag reduction, achieving an approximately 12.6% decrease in drag compared with the baseline model and effectively reducing the low-pressure region behind the vehicle. In contrast, spoilers with a length of 10 cm were unable to adequately guide the wake flow and therefore showed no drag-reduction benefits. Overall, the simulation results confirm that a properly designed rear spoiler can effectively improve the wake flow structure of a van-type vehicle, reduce pressure drag, and enhance overall aerodynamic performance. This study demonstrates the feasibility of applying rear container-truck spoilers to van-type vehicles and provides a reference for aerodynamic design and energy-efficiency improvement of ambulances. |
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| Files | indicate access worldwide | ||
| Date of Defense | 2025-01-16 | Date of Submission | 2026-01-19 |