Study on Time-Resolved Characteristics of Intermittent Air-Assisted Spray

被引：0
|
作者：
Wu H. [1 ,2 ]
Zhang Z. [1 ,2 ]
Zhang F. [1 ]
Hui Y. [1 ]
Gao H. [3 ]
机构：
[1] School of Mechanical Engineering, Beijing Institute of Technology, Beijing
[2] Yangtze Delta Region Academy, Beijing Institute of Technology, Jiaxing
[3] Beijing Aerospace Time Feihong Technology Company Limited, Beijing
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2023年 / 41卷 / 03期
关键词：
air-assisted spray; joint probability density function; slip velocity; spray characteristics;
D O I：
10.16236/j.cnki.nrjxb.202303026
中图分类号：
学科分类号：
摘要：
Experimental study of time-resolved microscopic spray characteristics of an intermittent air-assisted injection system was carried out using a high-speed camera and a phase-Doppler particle analyzer(PDPA). The droplet size-velocity joint probability density function(JPDF)，mean droplet diameter and velocity were compared and analyzed for different injection control parameters and spatial sampling positions. The local gas velocity and interphase slip velocity in the spray were calculated. The results show that when the fuel/air injection duration ratio is larger than 8，the projected area of the spray keeps increasing with the injection time. The droplet size-velocity JPDF under various operating conditions shows a single-peak distribution. The droplet diameter is mainly distributed in the range of 0—40 µm and the droplet velocity is within the range of 0—150 m/s. The increase of the fuel injection duration significantly increases the spray droplet diameter and decreases the droplet velocity. The air/fuel injection duration ratio larger than 0.25 causes the droplet to be further accelerated at the later stage of spray development. The interphase slip velocity under different fuel/air injection duration ratio will not be affected by the sampling time while the interphase slip velocity under various air/fuel injection duration ratio is affected by both the air injection duration and the sampling time. © 2023 Chinese Society for Internal Combustion Engines. All rights reserved.
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页码：220 / 229
页数：9
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