Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 166, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120725
Keywords
Gasoline direct injection; X-ray phase-contrast imaging; Ball motion; Near-field spray velocity; High-pressure injection
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education (Korea) [2019R1A2C1089494]
- Center for Environmentally Friendly Vehicle (CEFV) as the Global-Top Project of KMOE (Ministry of Environment, Korea) [2019002070001]
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This study visualized the ball (needle) motion and near-field spray characteristics of a gasoline direct injection injector under different injection conditions, and analyzed the effect of the injector's internal structure on these characteristics. It was found that the ball tilts during stable motion and holes with smaller inlet angles display better atomization characteristics.
The purpose of this study is to visualize the ball (needle) motion and near-field spray characteristics of a gasoline direct injection injector under different injection conditions and analyze the effect of the internal structure of the injector on the ball motion, near-field spray velocity, and post-injection process. The injection pressure is set to 10MPa, 20 MPa, and 30 MPa, and the energization duration is fixed at 1.5 ms. An advanced X-ray technique with high transmittance and low scattering, is used to visualize the internal structure and near-field spray characteristics of the injector, which is impossible with general light sources. The ball is found to tilt to the right in the Y-axial direction during stable motion because the driving force of fuel on the ball is larger on the left side owing to the larger distance of the ball from the left wall. In addition, during stable motion, the near-field velocity of a hole with a smaller inlet angle is significantly higher than that of a hole with a larger inlet angle. The hole with a smaller inlet angle display better atomization characteristics during the post-injection process under all values of injection pressure. (C) 2020 Elsevier Ltd. All rights reserved.
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