This paper presents a CFD-based assessment of the aerodynamic performance of a compact electric fire truck under constant speed driving condition. Steady, incompressible RANS simulations are performed using the SST    turbulence model with near-wall prism layers. Surface pressure distribution indicates strong stagnation regions on the front bumper, windshield, front-wheel leading areas, and the special-purpose module, which are identified as key contributors to drag generation. A drag-contribution breakdown shows that the upper body accounts for more than 80% of the total drag, while the underbody contributes about 11%, the front and rear wheels contribute 6.4% and 2.4%, respectively. Wake visualization further reveals drag-increasing flow structures around the wheels, rear-view mirrors, and the roof mounting region, as well as insufficient underbody upwash. These findings suggest that localized shape refinement and underbody fairing are promising directions for aerodynamic drag reduction in ultra-compact electric emergency vehicles.

• 전수원(원광대학교 기계공학과 대학원) | Su Won JEON
• 김준성(원광대학교 기계공학부 학부생) | Jun Sung KIM
• 김영렬(진우SMC 연구소) | Youngryul Kim
• 이상욱(원광대학교 기계공학과 교수) | Sang Wook LEE Corresponding author