Control of Mach number of Electromagnetically accelerated plasma flow using a magnetic nozzle and its applications

磁力喷嘴电磁加速等离子体流马赫数控制及其应用

• 批准号: 14208046
• 负责人: INUTAKE Masaaki
• 金额: $ 29.2万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14208046/
• 关键词: Magnetic nozzle; Laval nozzle; Plasma acceleration; Supersonic plasma flow; Mach number; Electromagnetic acceleration; MPD; HITOP

This research aims to clarify an electromagnetic acceleration mechanism of plasma flow and to control Mach number of the plasma flow using a magnetic nozzle for optimization of the plasma acceleration. Especially, we have directly observed the electromagnetic force (Lorentz force) accelerating the plasma in the Laval-type magnetic nozzle and compared it with the flow velocity measurement. We investigated in detail the formation of the Lorentz force in various magnetic field configurations and effects on the acceleration. The results are summarized as follows.1.The thermal energy of the ion was converted into the flow energy by passing through the Laval type magnetic nozzle at the muzzle of Magneto-Plasma-Dynamic arcjet (MPDA). The ion Mach number of the plasma attains to more than unity and the supersonic plasma flow was obtained.2.Spatial profiles of the several plasma parameters, flow velocity, ion temperature and Mach number of the plasma, were consistent with the theoretical results derived from the one-dimensional isentropic flow model.3.It was experimentally clarified that the magnetic field in the plasma flow became weak caused by the diamagnetic effect and the converging magnetic field was spontaneously formed near the MPDA. The Lorenz force by the azimuthal current and the inward magnetic field decelerated ions in the plasma.4.Adding a strong diverging magnetic field improved the deformation of the magnetic field and changes the deceleration force to acceleration force, which resulted in a large increase of plasma flow velocity.As a result, we have shown that the electromagnetic force acting on the plasma flow could be controlled directly by shaping the external magnetic field, and clarified the plasma acceleration mechanism and its control methods.

本研究旨在阐明等离子体流的电磁加速机理，并利用电磁喷嘴控制等离子体流的马赫数，以优化等离子体加速。特别是，我们直接观察到电磁力（洛伦兹力）加速等离子体在拉瓦尔型磁喷嘴，并与流速测量进行了比较。我们详细研究了洛伦兹力在各种磁场配置中的形成以及对加速度的影响。主要研究结果如下：1.磁等离子体动力电弧加热发动机（MPDA）喷口处的拉瓦尔型磁性喷管将离子的热能转化为流动能。得到了等离子体的离子马赫数大于1，得到了超声速等离子体流场。2.得到了等离子体流场的几个参数：流速、离子温度和等离子体马赫数的空间分布，与理论结果一致，三维等熵流模型。3.实验阐明了等离子体流中的磁场由于抗磁效应而变弱，会聚磁场在MPDA附近自发形成。4.外加一个强发散磁场，改善了磁场的变形，使减速力变为加速力，从而使等离子体流速大大增加，使离子体中的离子加速。我们已经表明作用在等离子体流上的电磁力可以通过成形外部磁场来直接控制，阐明了等离子体加速机理及其控制方法。

项目成果

Evaluation of Para-Perp Type Mach Prove by Using a Fast Flowing Plasma

使用快速流动等离子体评估 Para-Perp 型马赫证明

• 发表时间: 2005
• 期刊: J.Plasma and Fusion Research 81
• 作者: A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;M.Inutake;M.Inutake;A.Ando;A.Ando
• 通讯作者: A.Ando

Development of Supersonic Plasma Flows by use of a Magnetic Nozzle and an ICRF Heating

使用磁力喷嘴和 ICRF 加热开发超音速等离子流

• 发表时间: 2004
• 期刊: Proc.of 12^<th> International Congress on Plasma Physics 1
• 作者: K.Ikeda;Y.Ono;M.Enomoto;M.Kojima;T.Kobayashi;M.Seto;K.Koyama;Y.Uwatoko;A.Ando;K.Hattori;M.Inutake;A.Ando;A.Ando;A.Ando;M.Sakagami;Y.Kiwamoto;Y.Yatsuyanagi;M.Inutake
• 通讯作者: M.Inutake

H.Tobari: "Evaluation of Electromagnetic Forces in an Axially-magnetized MPD Arcjet Plasma"Proc. of 11^<th> International Congress on Plasma Physics. 475. 152-152 (2002)

H.Tobari：“轴向磁化 MPD Arcjet 等离子体中电磁力的评估”Proc。

Evaluations of Para-Perp Type Mach Probe by Using a Fast Flowing Plasma

使用快速流动等离子体评估 Para-Perp 型马赫探针

• 发表时间: 2005
• 期刊: J.Plasma and Fusion Research 81
• 作者: K.Hattori;H.Tobari;A.Ando;M. Inutake;M. Inutake;A. Ando;A. Ando;K. Nemoto;K. Hattori;K. Hattori;H. Tobari;A. Ando;M.Inutake;A.Ando;A.Ando;A.Ando;A.Ando;A. Ando;A. Ando;A. Ando;A. Ando;K.Hattori;A.Ando;M.Inutake;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;M.Inutake;A.Ando
• 通讯作者: A.Ando

Spatial Distribution of Lorentz Forces in an Applied-Field Magneto-Plasma-Dynamic Arcjet Plasma

外加场磁等离子体动力电弧喷射等离子体中洛伦兹力的空间分布

• 发表时间: 2004
• 期刊: J. Plasma Fusion Research 80
• 作者: A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;A.Ando;M.Inutake;M.Inutake;A.Ando;A.Ando;S.Matsuyama;A.Ando;H.Tobari
• 通讯作者: H.Tobari