Study on the supersonic flows inside and outside a micronozzle using LIF and MTV

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560198
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Kyushu University
• Principal Investigator: HANDA Taro 九州大学, 総合理工学研究科(研究院), 准教授 (30284566)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: マイクロ流れ / 超音速流れ / 圧縮性流れ / レーザー誘起蛍光法 / 分子タグ法 / マイクロ噴流

Outline of Final Research Achievements

In the present study, the characteristics of supersonic flows in a rectangular micronozzle were investigated using the LIF (Laser-Induced Fluorescence) and MTV (Molecular Tagging Velocimetry) techniques, both of which are a non-intrusive technique for measuring supersonic flows. The results demonstrated that the supersonic core of the jet issuing from the micronozzle is extended remarkably and becomes 60~70 times longer than the nozzle exit height at a certain operating condition. The results also demonstrated that the phenomenon peculiar to supersonic micro flows occur in the micronozzle; that is to say, the density distributions measured in the nozzle cannot be explained by the concept that has been believed.

Free Research Field

流体工学