Investigation on In-Nozzle Flow Characteristics Using X-Ray Imaging Technique

被引：0

作者：

Gao Y. ^{[1
]}

Huang W. ^{[2
]}

Li L. ^{[1
]}

Wu Z. ^{[1
]}

机构：

[1] School of Automotive Studies, Tongji University, Shanghai

[2] Energy and Environment Department, National Institute of Advanced Industrial Science and Technology, Tsukuba

来源：

Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2023年 / 41卷 / 05期

关键词：

fuel nozzle; gasoline direct injection; internal flow characteristics; synchrotron X-ray imaging;

D O I：

10.16236/j.cnki.nrjxb.202305054

中图分类号：

学科分类号：

摘要：

The in-nozzle flow and near-nozzle spray characteristics of a gasoline nozzle under the actual needle motion were visualized using the synchrotron radiation X-ray imaging technique. Firstly，the X-ray light source parameters were carefully determined to obtain the most optimized imaging quality. Then，the experiments were conducted to observe the in-nozzle flow and liquid-core breakup simultaneously. Finally，their dependency was discussed accordingly. Investigating results show that the hydraulic flip is formed shortly as the needle opens. The hydraulic flip width is sensitive to the orifice inlet angle，whereas barely changes with injection pressures. This phenomenon could result from the short length-to-diameter ratio of the currently used nozzle. The existence of a hydraulic flip in the nozzle boosts the jet breakup. The jet spreads wider as the hydraulic-flip width increases. © 2023 Chinese Society for Internal Combustion Engines. All rights reserved.

引用

页码：458 / 465

页数：7

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