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공기보조형 가솔린 연료분사기의 흡기포트내 연료분무 거동에 관한 연구
노병준,강신재,김원태,Rho, Byung-Joon,Kang, Shin-Jae,Kim, Won-Tae 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.1
The fuel spray behavior in the intake port of an electronic control port irijection gasoline engine has a strong influence on engine performance, exhaust emission and fuel consumption. Thus, in this study, fuel spray behavior and flow characteristics of the air assist gasoline spray injected into a suction flow in a simulated rectangular intake port have boon investigated. Macro-behavior of spray characteristics was investigated by means of visualization and the measurements of SMD and velocity were made by PDPA. For analysis the flow field with droplets size, droplets are classified five droplets size groups. As a result, the normal distance of suction flow increasing, the relatively large droplets distribution and SMD increase because small droplets easily follow suction flow. Near impinging wail, after impinging against the wall, secondary atomized small droplets of D < $30{\mu}m$ bound from the wall. And the increasement of suction flow progress to the large droplets of D > $100{\mu}m$ distribution. Therefore, SMD are apparently increased near impinging wall, Z/d = 9.0.
노병준(Byung-Joon Rho),정우태(Woo-Tae Jeung),이상진(Sang-Jin Lee),김성민(Sung-Min Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The aspect ratio is the main parameter which governs the outer flow pattern and nozzle performance.<br/> And in this study, some flow characteristics with the variation of nozzle aspect ratios such as mean<br/> pressure distributions along the center line of the outer flow, flow coefficients and the diffusion angles<br/> have been experimentally investigated. Through the experimental analysis, the higher aspect ratio was<br/> known to decrease the jet kinetic energy because of the friction losses at the outer of nozzle. As the<br/> result, it is found that the nozzle performance depends mainly on the aspect ratio of nozzle.
4공 가솔린 분사기의 2중 분무 사이에서 연료 액적들의 유동특성
김원태,강신재,노병준,Kim, Won-Tae,Kang, Shin-Jae,Rho, Byung-Joon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.4
This study investigates the flow characteristics of fuel droplets between twin spray for the 4-hole injector used a 4-valve gasoline engine. The injectors for this study were the three types of 4-hole gasoline injector in which orifice diameter was 0.24mm. The spray behavior of twin spray was investigated by means of visualization employed stroboscope. A PDPA system was employed to simultaneously measure the size and velocity of fuel droplets. The 3 dimensional mean velocities. droplet size distributions, SMD and joint probability density function of velocity and droplet size are analyzed at the center of the spray and the center region of twin spray. As a result, the configurations of injector exit such as orifice interval and length of outlet, are very important factors that affect the flow characteristics of fuel droplets at the center region of twin spray.
김원태,강신재,노병준,Kim, Won-Tae,Kang, Shin-Jae,Rho, Byung-Joon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
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.