Nozzle Processing Using Ultrasonic Cavitation Jet

高强度超声波对空化和进流有磨损作用。将其用于小型汽油机喷油嘴的精加工是一项研究。与传统方法相比，预期具有更好的效果。结果表明，小于等于10微米的钻头加工毛刺几乎被去除，流量增加。形状改变了比它大的毛刺，但去除是不可能的。根据这些结果，我们检验了有效空化能的利用。一是阐述了超声空化的处理机理。今年做了这项研究。一种实验装置超声振子增加了扩幅指数喇叭，用它来发射高强度的空化。振动器以28千赫150瓦的功率驱动它。一种实验装置具有通过空化来排出不必要的气泡的结构。空化排放介质采用高脱氧城市水。观测水箱是用透明的亚克力管子制成的。它的结构是在声场节点上做气泡的陷阱。我长大了一代又一代，泡沫最终会经历一个破裂的过程。我们观察到气泡的形状随着空化强度和崩溃时刻的声压的变化。观察到空化气泡。气泡的直径很小，只有微米量级。气泡的产生是不规则的，运动剧烈。我们用高速ccd显微镜观察了这个空化气泡。最大放大倍数为800。很难在一个小的摄影区域内观察一秒钟的现象.一些观察被多次试验证明是成功的。此外，还观察到了空化气泡坍塌时的声致发光。

There is abrasion action for cavitation and progressing flow to occur by a high-intensity ultrasonic. It is a study to use this for the finish processing of the fuel jet nozzle for small gasoline engines. In comparison with a conventional method, superior action is expected. As a result, burr of drill processing equal to or less than,10 micron was almost removed, and flow quantity increased. Shape transformed the large burr than it, but the removal was not possible. From these results, we examined usage of effective cavitation energy. The one is elucidation of processing mechanism of ultrasonic cavitation. This year did this study.An experimental deviceThe ultrasonic vibrator added exponential horn for amplitude expansion to used it for emission of the cavitation which was high-intensity. The vibrator drove it at 28 kHz 150W. An experimental device has structure to drain an unnecessary bubble by cavitation. The emission medium of cavitation used high deaerated city water. The observation water tank was made with a transparent acrylic pipe. It is structure to do a trap of a bubble in node of acoustic field. I grow up after generation, and a bubble takes a collapsing process at last. We observe a change of shape of a bubble for cavitation intensity and sound pressure of a moment of collapse.Observation of a cavitation bubbleA diameter of a bubble is small with micron order. Generation of a bubble is irregular, and the movement is intense. We observed this cavitation bubble with a high speed CCD microscope. Magnification at the maximum is 800. It was difficult that a photography area was small observation a phenomenon for a second. Some observation succeeded by many trials. Furthermore, acoustic luminescence with collapse of a cavitation bubble was observed.