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Control of Plasma at the Inlet of Disk MHD Generator by a Radio-Frequency Electromagnetic Field

射频电磁场对圆盘磁流体发生器入口处等离子体的控制

基本信息

批准号：
10650271
负责人：
OKUNO Yoshihiro
金额：
$ 2.56万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650271/
关键词：
MHD Power Generation Disk Generator Non-equilibrium Plasma Radio-frequency Plasma Pre-ionization

项目摘要

In order to realize the high performance non-equilibrium disk MHD generator working under wide range operating conditions, the plasma properties at the generator inlet should be controlled and optimized in response to the change in the operating condition. From this viewpoint, the aim of the present research is to clarify the usefulness of a radio-frequency electromagnetic field for the plasma production and control at the inlet of the disk MHD generator.For the present research, a new disk MHD generator was manufactured. In the disk MHD generator, radio-frequency induction coils are embedded in one side disk wall and anodes, which are needed for electric power extraction, are equipped in another side. At first, the plasma production by the radio-frequency electromagnetic field was attempted in the disk MHD generator under no seeding, no flow and no magnetic field. The experimental results showed that the nonequilibrium inert gas plasma uniform in the azimuthal direction was produced under the wide range of gas pressure condition. As the next step, the disk MHD generator was installed in the shock tube facility. It was confirmed in the experiment that the nonequilibrium plasma fairly uniform in the azimuthal direction was realized along the induction coil in the presence of high temperature, high pressure, high velocity flow and magnetic field by the radio-frequency electromagnetic field. Furthermore, in the power generation experiment without radio-frequency electromagnetic field, the performance of the present disk MHD generator with the asymmetrical electrode configuration was confirmed to be comparable to that of a conventional MHD generator.The subsequent research proposed on the basis of the present research is addressed to the improvement in the performance of disk MHD Generator by a radio-frequency electromagnetic field.

为了实现大范围工作的高性能非平衡盘式磁流体发电机，需要对发电机入口等离子体的特性进行控制和优化，以适应工作条件的变化。基于此，本研究的目的是阐明射频电磁场在盘式磁流体发生器入口等离子体产生和控制中的作用。在盘式磁流体发电机中，射频感应线圈被嵌入在一侧的盘壁中，并且用于电力提取的阳极被装备在另一侧。首先，在无引晶、无气流、无磁场的条件下，利用射频电磁场在圆盘磁流体发生器中产生等离子体。实验结果表明，在较宽的气压范围内产生了沿方位方向均匀分布的非平衡惰性气体等离子体。作为下一步，磁盘磁流体发电机安装在激波管设施。实验证实，在高温、高压、高速流动和磁场的作用下，利用射频电磁场可以实现沿感应线圈沿着方向均匀分布的非平衡等离子体。此外，在无射频电磁场的发电实验中，证实了非对称电极结构的圆盘MHD发电机的性能与传统的MHD发电机相当，并在此基础上提出了利用射频电磁场提高圆盘MHD发电机性能的后续研究。