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Characteristics of the Gasoline Spray near Impinging Wall in Suction Flow
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 Title & Authors
Characteristics of the Gasoline Spray near Impinging Wall in Suction Flow
Kim, Won-Tae; Kang, Shin-Jae; Rho, Byung-Joon;
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 Abstract
In port fuel injection system of SI engines, injected fuel is impinged onto the surface of intake valves and port-wall, and then formed the wall flow under the cold start operation. Wall flows entrained into the cylinder result in the unsteady and nonuniform mixture formation. Therefore, the spray impingement to the wall is considered as having negative influences such as lowering combustion efficiency and causing unburned hydrocarbon emissions. This study investigates the spray characteristics of the wall impinging air-assist spray in suction air flow. A PDPA was used to analyze the flow characteristics under the different conditions such as impingement angle and supplied air. Experimental data concerning the impinging sprays has been obtained in the vicinity of the wall. Measured droplets divided into the pre-impinging droplets which denote as the positive normal velocities and post-impinging droplets that describe as the negative normal velocities for the suction flow. Their velocities, size distributions and SMD are comparatively analyzed before and after the impingement.
 Keywords
SI Engine;Wall Impinging;Air-assist;Pre-Impinging Droplet;Post-impinging Droplet;PDPA;SMD;
 Language
Korean
 Cited by
1.
가솔린 직접분사식 고압선회 분사기의 분무 영역별 분무 특성 고찰,송범근;김원태;강신재;

대한기계학회논문집B, 2003. vol.27. 1, pp.9-16 crossref(new window)
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