자연풍을 고려한 대형트럭 캡 측면 오염에 관한 비정상 상태 입자 유동해석

다국어 초록 (Multilingual Abstract)

The main function of the corner vane is to reduce dirt contamination to the side surface of the truck cab by changing the flow direction and the drag force due to flow separation occurring at a corner. Hence, detailed knowledge of the flow field around the corner vane was essential in improved fuel efficiency and reduced dirt contamination on the vehicle body surface. In the case of trucks driving off-road and on a wet road, dust generated by tire/soil interaction spoiled not only the vehicle’s appearance, but also the safety of the field of view due to adhesion to the body surface, side windows, and exterior mirrors. The main goal of the research was to establish an unsteady state simulation process and to gain a better understanding of dirt contamination mechanisms after considering the effect of natural wind systems. This paper discussed a collaborative effort where a CFD(Computational Fluid Dynamics) method was first validated upon road testing and then applied to a new design study. Based on off-road driving tests, it was observed that the main stream causing the dirt contamination phenomenon was determined by the interaction between the dispersed flow inside the wheel house and the intermittent inflow stream from the lower part of the engine room. As a result of this study, it was confirmed that a complex, three-dimensional vortex could occur around the wheel house region, and noticeable outflow was also observed in the front upper part of the rotating tire. The particle path lines starting from the emission box around the surface of the wheel exposed to wind were deflected upward periodically. Some of the particle path lines were directed to the upper region through the mirror wake flow.

참고문헌 (Reference)

1 김철호, "대형트럭용 루프 훼어링과 디프렉트의 공기저항력 저감 특성에 관한 연구" 한국자동차공학회 14 (14): 194-201, 2006

2 M. Kim, "Three-Dimensional Numerical Study on the Aerodynamic Characteristics around Corner Vane in Heavy-Duty Truck" 8 (8): 181-189, 2000

3 H. Gu, "The Analysis of Distribution Characteristics of Wind in Korea using Steadiness Index" 3 (3): 87-95, 2008

4 "SAE International Surface Vehicle Recommended Practice, SAE Wind Tunnel Test Procedure for Trucks and Buses, SAE Standard J1252"

5 R. Clift, "Bubbles, Drops and Particles" Academic Press 1978

6 M. Kim, "A Study on the Improvement of a Dirt Contamination in a Heavy-duty Truck" 2260-2267, 2010

7 J. Ha, "A Study on an Aerodynamic Reduction Effect of a Rear Upper Guide System on the Heavy Truck" 1093-1098, 2010