Numerical study on performance of disk MHD generator using frozen inert gas plasma
Numerical study on performance of disk MHD generator using frozen inert gas plasma
复制标题
冷冻惰性气体等离子体盘式磁流体发生器性能数值研究
DOI：
10.1109/tps.2002.806616
复制
发表时间：
2002
影响因子：
1.5
通讯作者：
Y. Okuno
中科院分区：
文献类型：
--
作者：
Hiromichi Kobayashi;Y. Satou;Y. Okuno
在采用冷冻惰性气体等离子体（FIP）的磁流体动力（MHD）发生器中，通过/spl gamma/-/spl theta/二维模拟，对冷冻氩等离子体的可用性、发生器入口等离子体均匀性对性能的影响以及大型发生器的可行性进行了数值验证。FIP是通过在发生器入口处不加碱金属种子的惰性气体预电离产生的，由于惰性气体像冷冻反应等离子体一样重组相当缓慢，因此等离子体在整个通道内的电离度几乎保持恒定。研究发现，虽然氩的入口电离度需要高度精确的控制，但不仅可以实现氦，还可以实现氩冷冻等离子体的MHD生成。为了提高最大焓萃取比，降低发生器入口等离子体特性的不均匀性是很重要的。即使对于1000mw热输入的大型发电机，整个通道的电离度几乎保持恒定，也能获得较高的性能。这一结果对FIP MHD发生器非常有吸引力。
In an magnetohydrodynamic (MHD) generator using a frozen inert gas plasma (FIP), the availability of a frozen argon plasma, the influence of plasma uniformity at the generator inlet on the performance, and the feasibility of a large-scale generator are numerically examined by /spl gamma/-/spl theta/ two-dimensional simulation. The FIP is produced by pre-ionizing inert gas without an alkali metal seed at the generator inlet, then the ionization degree of the plasma is kept almost constant in the whole of the channel because of considerable slow recombination of the inert gas just like frozen reaction plasma. It is found that not only helium, but also argon frozen plasma MHD generation is realized, although highly accurate control of inlet ionization degree is necessary for argon. It is important to reduce the nonuniformity of plasma properties at the generator inlet in order to raise the maximum enthalpy extraction ratio. Even for the large-scale generator with 1000-MW thermal input, the ionization degree is kept almost constant in the whole of the channel and the high performance is obtainable. This result is extremely attractive for the FIP MHD generator.