CLOSED CYCLE MHD SYSTEM USING He/Xe WORKING GAS
CLOSED CYCLE MHD SYSTEM USING He/Xe WORKING GAS
复制标题
使用 He/Xe 工作气体的闭循环 MHD 系统
DOI：
10.2514/6.1997-2372
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
N. Harada
中科院分区：
文献类型：
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作者：
N. Sakamoto;H. Endo;N. Harada
本文研究了不使用碱金属籽晶的闭式循环磁流体发电系统的可能性。基于籽晶的重要作用，我们提出了采用氙作为籽晶材料。通过求解Saha方程的考虑表明，要使氙的电子数密度得到显著提高，必须使用氦，而要使氙的电子数密度达到与碱金属籽晶相同的水平，则必须保持较高的电子温度（8000- 9000 K）。采用一维数值模拟的方法进行了设计研究和性能预测。我们成功地设计出了能提供40%以上热焓提取的氙籽晶发生器。研究了Penning电离的影响。讨论电离过程，特别是在相对较低的温度范围内的电离过程是很重要的。为了研究等离子体的稳定性和放电结构，进行了二维数值模拟，并给出了初步结果。等离子体相当均匀，可以获得高焓提取，没有引入干扰。然而，等离子体变得不均匀，发生器的性能显着下降时，引入扰动。为实现这一设想，如何提高等离子体的初始电导率、稳定性及其对等离子体参数和发生器性能的影响有待研究。
In this paper, we examined possibility of closed cycle MHD power generation system without using alkali-metal seed. Based on the important role of seed, we proposed to use xenon as seed material. Consideration by solving Saha equation showed that helium must be used to obtain notable enhancement of electron number density from xenon and that higher electron temperature of 8000-9000K must be kept to achieve same electron number density level as that for alkali-metal seed. Design study and performance prediction by means of 1 -dimensional numerical simulation were carried out. We succeeded to design the disk generator for xenon seed which could provide over 40% enthalpy extraction. Influence of Penning ionization was studied. It was important to discuss ionization process particularly in relatively lower temperature regime. In order to study plasma stability and discharge structure, 2-dimensional numerical simulation was started and preliminary results were presented. Plasma was quite uniform and high enthalpy extraction could be obtained with no disturbance introduced. However, plasma became non-uniform and generator performance was significantly decreased when disturbance was introduced. To realize this proposal, how to increase initial conductivity, plasma stability and its effects on plasma parameter and generator performance were left to be studied.