Plasma stabilization and improvement in the performance of a nonequilibrium disk MHD generator by a radio-frequency electromagnetic field
Plasma stabilization and improvement in the performance of a nonequilibrium disk MHD generator by a radio-frequency electromagnetic field
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通过射频电磁场实现等离子体稳定并提高非平衡盘 MHD 发生器的性能
DOI：
10.1109/27.772292
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发表时间：
1999
影响因子：
1.5
通讯作者：
S. Kabashima
中科院分区：
文献类型：
--
作者：
T. Murakami;Y. Okuno;S. Kabashima
采用r-/spl θ/二维数值模拟方法，研究了在非平衡盘形磁流体发电机工作气体中加入射频（RF）电磁场以改善其性能的可行性。研究了射频电场作用下磁流体等离子体的行为与发生器性能之间的关系。水的污染会引起等离子体的强烈非均匀性和非稳定性，使等离子体的性能恶化。电子温度和种子原子的电离度的波动被发现抑制通过施加RF电场。其结果是，发电机的焓提取率和等熵效率提高。RF电场所需的额外焦耳加热与用于稳定等离子体和改善性能的发生器的热输入的比率估计为约0.9%。
By applying a radio-frequency (RF) electromagnetic field, the feasibility of improvement in the performance of a nonequilibrium disk-shaped magnetohydrodynamic (MHD) generator suffering from water vapor contamination in the working gas is investigated with r-/spl theta/ two-dimensional numerical simulations. Attention is paid to the relation between the behavior of MHD plasma in the presence of the RF electric field and the generator performance. The water contamination causes the strongly nonuniform and unsteady plasma, and deteriorates its performance. The fluctuations of the electron temperature and of the ionization degree of seed atoms are found to be suppressed by applying the RF electric field. As a result, the enthalpy extraction ratio and the isentropic efficiency of the generator improve. The ratio of the required additional joule heating by the RF electric field to the thermal input to the generator for the stabilization of the plasma and the improvement in the performance is estimated to be about 0.9%.