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- W3161063279 abstract "The purpose of this paper is to investigate the effect of the different hole diameter on the spray and droplet atomization characteristics in a gasoline direct injection (GDI) injector. In order to understand the spray characteristics, the frozen spray images were captured by high speed camera with light-source in the constant-volume chamber. The spray characteristics, such as the spray tip penetration, spray area, and spray width, were calculated and analyzed from the captured spray images using MATLAB code. The atomization characteristics were analyzed through the droplet size, distribution, and velocity. The droplet size and velocity were measured by the phase Doppler anemometry (PDA). The test injectors have a single-hole, and the difference of hole diameter among test injectors was set to 30 ㎛. The test was conducted under the following experimental conditions: injection pressure of 50 bar to 200 bar with 50 bar step, ambient pressure of 5 bar and 15 bar, energizing duration of 1.5ms.The experimental results showed that the larger the injector hole diameter, the longer spray tip penetration and the larger the spray area for the same time. As the diameter increases, the injection quantities increase and the spray momentum increases accordingly. Because of the large amount of spray momentum, injectors with large hole diameter have long spray tip penetration and wider spray areas. In the vicinity of the nozzle tip, the spray width over time tends to be similar to the injection rate result. It can be seen that the spray width has a close relationship with the injection rate. The larger the hole diameter, the larger the Sauter mean diameter (SMD) and the smaller the droplet velocity. As the injection pressure increased, the SMD decreases and droplet velocity increases." @default.
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- W3161063279 date "2017-01-01" @default.
- W3161063279 modified "2023-09-24" @default.
- W3161063279 title "Spray Characteristics of GDI Injectors with Different Hole Diameter" @default.
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