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대형트럭용 공기저항 저감 장치인 루프 훼어링과 디프렉트의 공기역학적 특성에 관한 연구
김철호(Chul-Ho Kim),윤찬배(Chanbae Youn) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An aerodynamic drag force generated on a moving body is a negative factor not only for the dynamic stability performance of the body but also for the energy efficiency of the driving power of it. Because of this, a roof-fairing or deflector system that is known as one of the simplest and effective devices has been applied to reduce an aerodynamic drag force on a heavy-duty truck. In this study, a numerical approach has been done to see the effect of the systems on a running vehicle. For this purpose, five different models of the drag reduction system were designed and incorporated to numerical experimentation to understand which one of the drag reducing systems has better effect on the aerodynamic characteristics such as drag, lift and power savings. The calculation results were compared one another quantitatively to find out the most effective device on the model vehicle. From the experimental results, the deflector system(Model 5,6) was revealed as a better device for reduction of aerodynamic drag than the roof-fairing system(Model 2,3,4) on the heavy-duty truck and it can be expected that over 10% of brake power of an engine can be saved on a tractor-trailer by the aerodynamic drag reducing device at normal speed range(80Km/h~).<br/>
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