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자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 2002년 춘계학술대회논문집 3호
발행연도
2002.5
수록면
1,499 - 1,505 (7page)

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이 논문의 연구 히스토리 (3)

초록· 키워드

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An objective of this numerical study is to understand an aerodynamic effect of a drag-reducing device on a heavy-duty truck. When a tractor-trailer runs straightfomard at a constant speed with no side wind, the vehicle experiences two kinds of aerodynamic force; drag and lift force (or down force). Aerodynamic drag force acting on a running vehicle is one of serious obstacles increasing fuel consumption of the vehicle. The negative lift force influences the rolling resistance of the vehicle on the road. For the reduction of the aerodynamic drag force on a heavy-duty truck, a device named roof-fairing system has been applied. Recently, heavy-duty trucks, which have a drag reduction device, are often shown on the load in Korea. However, it is hard to expect the best efficiency of the device on the vehicle without exact understanding of engineering information of the system.
In this study, four different shapes of a roof-fairing model attached on the tractor were incorporated to see airflow phenomenon around a truck and aerodynamic forces generated on the body. The calculation results were analyzed to find out the size of drag and lift force generated on the vehicle and the forces compared one another to explain that which fairing model is better than others.
From this study, it was found that negative lift force or down force increases even though the drag force decreases with respect to vehicle speed in all roof-fairing models. It means that rolling resistance of a model vehicle due to the negative lift force is another important factor that should be carefully considered for an optimum aerodynamic design of a roof-fairing system of a tractor-trailer. According to the results, the model-2 that has 2/3h in height has the lowest drag force among the test model fairings in all speed range and reasonable down force as well. It is due to the thickness of boundary layer generated on the topside of the container.

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ABSTRACT

1. 서론

2. 대형 상용차의 공기역학적 특성 및 구조

3. 수치해석적 연구를 위한 기법과 조건

4. 수치해석 결과의 분석기법

5. 연구결과 및 고찰

6. 결론

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