| Citation: | SHANG Yong, JIN Wei. Mechanism of spray in gasoline direct injection engine based on laser diagnostics[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(1): 60-66. doi: 10.13700/j.bh.1001-5965.2019.0178(in Chinese)
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It is important to study the direct injection spray penetration and spray cone angle characteristics of gasoline for the occurrence and development of spray and combustion characteristics in gasoline direct injection engine. Based on the design and building of gasoline direct injection (GDI) system, the constant volume combustion bomb system and the optical testing system are established, and based on LSD measurement technique, the influence of injection pressure and back pressure on the spray characteristics of GDI engine is studied in this paper. The experiment shows that with the increase of injection pressure, the penetration at the same injection time gradually increases. With the increase of back pressure, the penetration at the same injection time decreases gradually. Under different injection pressure and back pressure, with the development of injection time, the penetration gradually increases, and the spray cone angle is between 38° and 50°.
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