Plasma-fluid behavior of a less divergent disk magnetohydrodynamic Generator using helium-cesium
Plasma-fluid behavior of a less divergent disk magnetohydrodynamic Generator using helium-cesium
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使用氦铯的较小发散盘磁流体动力发生器的等离子体流体行为
DOI：
10.1109/tps.2004.833384
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发表时间：
2004
影响因子：
1.5
通讯作者：
H. Yamasaki
中科院分区：
文献类型：
--
作者：
T. Murakami;H. Yamasaki
我们描述了一个较少发散的圆盘形径向流磁流体发电机的等离子体流体行为和性能，使用铯种子氦（He-Cs），并将其与铯种子氩（Ar-Cs）发电机进行比较。采用He-Cs的小发散发生器具有45%的等熵效率和15.9%的焓萃取率。使用He-Cs的发电机性能在种子分数较低时达到峰值，为1.7/spl倍/10/sup -4倍/，与Ar-Cs发电机相比降低了四倍。适当的He-Cs操作使霍尔参数加倍（3.7），但与Ar-Cs发电机相比，电导率降低到四分之一。He-Cs等离子体的电子温度在较宽的粒子分数范围内不超过4000 K；这表明等离子体处于完全电离的种子状态。因此，He-Cs等离子体形成了一个稳定而均匀的结构，没有任何特定的不均匀性。虽然氦铯等离子体的辐射受到扰动，但其特征频率很高（从60到90千赫）。相比之下，Ar-Cs等离子体在低种子分数时形成局域结构，而在高种子分数时形成致密的同心圆形结构。
We describe the plasma-fluid behavior and performance of a less divergent disk-shaped radial-flow magnetohydrodynamic (MHD) generator using cesium-seeded helium (He-Cs) and compare it to a cesium-seed argon (Ar-Cs) generator. The less divergent generator using He-Cs provides a high isentropic efficiency of 45% and an enthalpy extraction ratio of 15.9%. The generator performance using He-Cs peaks at a low seed fraction of 1.7/spl times/10/sup -4/, which was reduced by a factor of four compared to the Ar-Cs generator. The proper He-Cs operation doubles the Hall parameter (3.7) but reduces the electrical conductivity to one-quarter in comparison with the Ar-Cs generator. The electron temperature of the He-Cs plasma is no more than 4000 K in a wide seed fraction range; this suggests that the plasma is in a fully ionized seed condition. Thus, the He-Cs plasma forms a stable and homogeneous structure without any specific nonuniformity. Although radiation from the He-Cs plasma is perturbed, its characteristic frequency is high (from 60 to 90 kHz). In contrast, the Ar-Cs plasma forms a localized structure at low seed fractions and a dense concentric circular structure at high seed fractions.