충돌분무의 거동에 미치는 벽면곡률의 영향에 대한 수치해석 연구Numerical Study on the Effect of the Wall Curvature on the Behaviors of the Impinging Sprays
- Authors
- 고권현; 유홍선
- Issue Date
- 2004
- Publisher
- 한국자동차공학회
- Keywords
- 충돌분무; 벽면곡률; 벽제트 보텍스; 스플래시; 보텍스 중심; Impinging spray; Wall curvature; Wall jet vortex; Splash; Vortex center
- Citation
- 한국자동차공학회 논문집, v.12, no.3, pp 59 - 65
- Pages
- 7
- Journal Title
- 한국자동차공학회 논문집
- Volume
- 12
- Number
- 3
- Start Page
- 59
- End Page
- 65
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/28713
- ISSN
- 1225-6382
2234-0149
- Abstract
- In this paper a numerical study was performed for the effect of the wall curvature on the behaviors of fuel sprays impinging on the concave Surface. Actually, in the real diesel engines, a piston head has a curved shape for the purpose of the controlling the movement of fuel droplets and the mixture formation. For past decades, although many experimental and numerical works had been performed on the spray/wall impingement phenomena, the curvature effect of impinged wall was rarely investigated. The wall curvature affects on the behaviors of the secondary droplets generated by impingement and the concave wall obstructs the droplets to advance from the impinging site to outward. In present study, the simulation code was validated for the flat surface case and three cases of the different curvature were calculated and compared with the flat surface case for several parameters, such as the spray radius, the spray height and the position of vortex center of gas phase. The simulation results showed that the radial advance of the wall spray and the vortex is decreased with increasing the curvature. It was concluded that the curvature of the impinged wall significantly affects the behaviors of both the gas-phase and the droplet-phase.
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