Horn geometry effects on atomization characteristics of a micro nozzle array type ultrasonic fuel injector

被引：0

作者：

Araki, Mikiya ^{[1
]}

Obokata, Tomio ^{[1
]}

Ishima, Tsuneaki ^{[1
]}

Shiga, Seiichi ^{[1
]}

Masubuchi, Masahiko ^{[1
]}

Sugimoto, Tomojiro ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Gunma University, Kiryu-shi, Gunma, 376-8515

来源：

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2008年 / 74卷 / 01期

关键词：

Liquid atomization; Micro nozzle array; Port fuel injector; Ultrasonic oscillator;

D O I：

10.1299/kikaib.74.228

中图分类号：

学科分类号：

摘要：

Effects of horn geometry on the atomization characteristics of an ultrasonic fuel injector using a micro nozzle array were investigated experimentally. Micro nozzles whose exit diameter d=3 μm are mounted on a thin metal film. The number of the micro nozzles is from 2.0×10 4 to 1.2×105. Using an ultrasonic oscillator, gasoline is periodically pushed out from the micro nozzles at a frequency from 62 to 65 kHz. A disk type PZT is used as an ultrasonic oscillator, and the oscillation is amplified using a step-type horn. The input voltage to the PZT is varied from 0 to 200 V. To increase the fuel flow rate, the horn small end diameter Ds is increased from 10.5 to 25 mm, while the large end diameter is fixed at 30 mm. To prevent forming a liquid film on the micro nozzle array, gutters are machined on the small end of the horn. It is shown that the SMD (Sauter mean diameter) of the spray is almost uniform around 10 to 14 μm, regardless of the horn small end diameter. The fuel flow rate increases, at the maximum, 2.8 times larger when compared to the original horn geometry.

引用

页码：228 / 236

页数：8

共 6 条

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