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Analysis of Atomization Processes of a Slit-Type Injector (Effect of Cross-Flow and Wall Impingement)
Published May 21, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Meeting
The analysis of spray characteristics is important to examine the combustion characteristics of DI gasoline engines because the fuel-air mixture formation is controlled by spray characteristics and gas motion. However, the gasoline spray characteristics have not been well clarified due to the experimental difficulties. In this study, the characteristics of a fan-shaped spray, such as the droplet size, its velocity and the droplet distribution were simultaneously measured on a 2D plane by using ILIDS (Interferometric Laser Imaging for Droplet Sizing) method. ILIDS method is an optical measurement using interference fringes by illuminating transparent spherical particles with a coherent laser light. In the measurement of the wall-impinging spray, effects of the distance to the wall and the wall temperature on the spray characteristics were investigated. As a result, it was found that the SMD near the wall surface increased with shortening the distance. In the measurement of spray under cross flow, the relative velocity of between the droplet and the ambient gas was found influential on the atomization.