A study on the macroscopic spray behavior and atomization characteristics of biodiesel and dimethyl ether sprays under increased ambient pressure
A study on the macroscopic spray behavior and atomization characteristics of biodiesel and dimethyl ether sprays under increased ambient pressure
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DOI：
10.1016/j.fuproc.2009.11.007
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发表时间：
2010-03-01
影响因子：
7.5
通讯作者：
Lee, Chang Sik
中科院分区：
文献类型：
--
作者：
Kim, Hyung Jun;Park, Su Han;Lee, Chang Sik
采用图像处理技术和雾化性能分析技术，研究了不同环境压力条件下生物柴油和二甲醚（DME）燃料在高压缸内的喷雾特性。为了观察生物柴油和二甲醚燃料在不同环境压力下的喷雾行为，使用由高速摄像机和两个金属卤化物光源组成的可视化系统，分析了喷雾图像开始后的不同时间。此外，使用能够承受4 MPa压力的高压室来调节环境压力。从喷雾图像，喷雾特性，如喷雾尖端的穿透，锥角，面积，并在不同的光强度水平的轮廓图进行了分析，使用图像转换处理。利用液滴测量系统测量了不同轴向/径向距离处的局部Sauter平均直径（SMD），比较了生物柴油和二甲醚喷雾的雾化性能，结果表明，在不同的实验条件下，环境压力对燃料的喷雾特性有显著的影响。随着环境压力的增加，喷雾贯穿距离和喷雾面积减小。生物柴油和DME喷雾的等高线图显示喷雾中心区域的高光强水平。在相同的喷射和环境条件下，生物柴油喷雾的雾化性能不如二甲醚喷雾。(C)2009爱思唯尔有限公司版权所有。
The aim of this work is to investigate the spray behaviors of biodiesel and dimethyl ether (DME) fuels using image processing and atomization performance analysis of the two fuel sprays injected through a common-rail injection system under various ambient pressure conditions in a high pressure chamber. In order to observe the biodiesel and DME fuel spray behaviors under various ambient pressures, the spray images were analyzed at various times after the start of energization using a visualization system consisting of a high speed camera and two metal halide light sources. In addition, a high pressure chamber that can withstand a pressure of 4 MPa was used for adjusting the ambient pressure. From the spray images, spray characteristics such as the spray tip penetration, cone angle, area, and contour plot at various light intensity levels were analyzed using image conversion processing. Also, the local Sauter mean diameters (SMD) were measured at various axial/radial distances from the nozzle tip by a droplet measuring system to compare the atomization performances of the biodiesel and DME sprays.The results showed that the ambient pressure had a significant effect on the spray characteristics of the fuels at the various experimental conditions. The spray tip penetration and spray area decreased as the ambient pressure increased. The contour plot of the biodiesel and DME sprays showed a high light intensity level in the center regions of the sprays. In addition, it was revealed that the atomization performance of the biodiesel spray was inferior to that of the DME spray at the same injection and ambient conditions. (C) 2009 Elsevier B.V. All rights reserved.