Earticle

초록

영어

This study was performed to analyze the effect on driving performance by identifying the flow characteristics of the rear diffuser such as drag coefficient, lift coefficient, velocity vector, velocity streamlines, turbulence kinetic energy and vortex-core region according to the angle of the sedan rear diffuser and the shape of the divider. The angle of the diffuser was analyzed at 2° intervals from 0° to 18°, and the divider was analyzed by changing from one to five. The three-dimensional modeling was performed using CATIA V5 and the vehicle model was selected as a sedan car in the form of an LF Sonata. The CFD analysis was performed in order to identify the flow characteristics of rear diffuser using ANSYS CFX 14.5.7. For each model, the analysis was performed under each condition with speeds of 80km/h, 100km/h, 120km/h, 140km/h. The results of the flow analysis showed that the rear diffuser angle was the best result in driving stability at 6°. The results of the study on the number of dividers showed the best result value in driving stability when the rear diffuser angle was 6° and the divider was 3 and selected as the optimal shape.

목차

ABSTRACT
1. 서론
2. 유동해석방법
2.1 유동해석을 위한 지배방정식
2.2 유동해석 방법
2.3 격자생성(mesh generation)
2.4 경계조건(boundary conditions)
3. 리어 디퓨저 각도변화
3.1 리어 디뷰퍼의 각도변화 모델
3.2 항력계수 특성
3.3 양력계수 특성
3.4 최적 각도에서의 항력 및 양력계수 비교
4. 리어 디퓨저 디바이더 개수 변화
4.1 리어 디퓨저 디바이더 개수변화 모델
4.2 항력계수 특성
4.3 양력계수 특성
4.4 최적 디바이더에서의 유동특성비교
5. 결론
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References

키워드

리어 디퓨저 칸막이 항력계수 양력계수 압력계수 전산유체역학 Rear diffuser Divider Drag coefficient Lift coefficient Pressure coefficient CFD

저자

• 김나용 [ Na-Yong Kim | Automotive Engineering, Grauate School, Gyeongnam National University of Science and Technology ]
• 김봉환 [ Bong-Hwan Kim | Member, Gyeongnam National University of Science and Technology ] Corresponding Author

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