Deformation of Shock Wave in Supersonic Plasma Jet Caused by Applied Magnetic Field

外加磁场引起的超音速等离子射流冲击波变形

• 批准号: 22560174
• 负责人: KOIKE Kazuo
• 金额: $ 2.41万
• 依托单位: Tohoku Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560174/
• 关键词: 流体工学; プラズマ; 流体計測; 衝撃波; プラズマ噴流; 磁場; 光学計測; 画像解析; プラズマ加工

An experimental study of underexpanded plasma jet was carried out to reveal the effects of applied magnetic field on flow behavior around the normal shock wave, that is, Mach disk. Photographic images of the flow were taken with a digital single-lens reflex camera. The light intensity is extracted from uncompressed RAW files of the images. Angles of barrel and reflected shock wave to the flow direction at the reflected shock starting point were determined from the gradient of the light intensity. The angle of reflected shock wave increases with magnetic field intensity. On the other hand, the angle of barrel shock wave tends to decrease with increases in the field strength. Contour plots of the light intensity in downstream region from Mach disk significantly changes with applied magnetic field compared to those without the field. The effects of magnetic field on oblique shock wave around a conical probe in supersonic region of the jet were also studied using the light intensity . The local Mach number in the jet, evaluated from the oblique shock angle using Taylor-Maccoll equation, shows a tendency to increase with the field strength.

对欠膨胀等离子体射流进行了实验研究，揭示了外加磁场对法向激波即马赫盘周围流动行为的影响。流动的照片是用数码单反相机拍摄的。从图像的未压缩RAW文件中提取光强度。根据光强的梯度确定了反射激波起始点的炮管和反射激波与水流方向的夹角。反射冲击波的角度随磁场强度的增大而增大。另一方面，身管激波波角随场强的增大而减小。与无磁场相比，马赫盘下游区域的光强等值线图随着外加磁场的变化而发生显著变化。利用光强研究了磁场对超音速锥形探头周围斜激波的影响。从斜激波角度用Taylor-Maccoll方程计算得到的射流中的局部马赫数随场强的增大而增大。

项目成果

Effects of Applied Magnetic Field on Light Intensity Distribution around Mach Disk in Plasma Jet

等离子射流中外加磁场对马赫盘周围光强分布的影响

• 发表时间: 2013
• 作者: Noriaki ITAMIYA;Hiroshi SHINDO;Norifumi ONO and Kazuo KOIKE;Kazuo KOIKE and Norifumi ONO
• 通讯作者: Kazuo KOIKE and Norifumi ONO

磁場下におけるプラズマ噴流内斜め衝撃波の画像診断

磁场下等离子射流斜激波的图像诊断

• 发表时间: 2011
• 作者: 天田裕久;小野憲文;小池和雄
• 通讯作者: 小池和雄

Image Analysis of an Oblique Shock Wave around a Conical Probe in Plasma Jet under Applied Magnetic Field

外加磁场下等离子射流中锥形探针周围倾斜冲击波的图像分析

• 发表时间: 2012
• 期刊: Frontier of Applied Plasma Technology
• 作者: Noriaki ITAMIYA;Hiroshi SHINDO;Norifumi ONO and Kazuo KOIKE
• 通讯作者: Norifumi ONO and Kazuo KOIKE

Image Analysis of Shock Wave around a Circular Cone in Plasma Jet under Applied Magnetic Field

外加磁场下等离子射流中圆锥周围冲击波的图像分析

• 发表时间: 2011
• 期刊: ADVANCES IN APPLIED PLASMA SCIENCE
• 作者: Noriaki Itamiya;Hiroshi Shindo;Norifumi Ono and Kazuo Koike
• 通讯作者: Norifumi Ono and Kazuo Koike

Flow around Mach Disk in Under-Expanded Plasma Jet under Applied Magnetic Field

外加磁场下欠膨胀等离子射流中马赫盘周围的流动

• 发表时间: 2011
• 期刊: Proceedings of the 18th Annual Meeting of IAPS, International Workshop 2011 in Melbourne, Plasma Application & Hybrid Functionally Materials
• 作者: N.ITAMIYA;H.SHINDO;N.ONO;K.KOIKE
• 通讯作者: K.KOIKE