Effect of fuel and nozzle geometry on the off-axis oscillation of needle in diesel injectors using high-speed X-ray phase contrast imaging

被引：9

作者：

Zhang, X. ^{[1
]}

Liu, J. ^{[1
]}

Wang, J. ^{[2
]}

机构：

[1] Shanghai Maritime Univ, Merchant Marine Coll, Shanghai 201306, Peoples R China

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

来源：

JOURNAL OF INSTRUMENTATION | 2016年 / 11卷

基金：

中国国家自然科学基金;

关键词：

X-ray mammography and scinto- and MRI-mammography; X-ray radiography and digital radiography (DR); INTERNAL FLOW; SPRAY CHARACTERISTICS; CAVITATION; BIODIESEL;

D O I：

10.1088/1748-0221/11/05/C05015

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The diesel spray characteristics are strongly influenced by the flow dynamics inside the injector nozzle. Moreover, the off-axis oscillation of needle could lead to variation of orifice flow in the nozzle. In this paper, the needle oscillation was investigated using high-speed X-ray phase contrast imaging and quantitative image processing. The effects of fuel, injection pressure and nozzle geometry on the needle oscillation were analyzed. The results showed that the vertical and horizontal oscillation of needle was independent on the injection pressure. The maximum oscillation range of 14 mu m was found. Biodiesel application slightly decreased the needle oscillation due to high viscosity. The needle oscillation range increased generally with increasing hole number. The larger needle oscillation in multi-hole injectors was dominated by the geometry problem or production issue at lower needle lift. In addition, the influence of needle oscillation on the spray morphology was also discussed.

引用

页数：14

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