Experimental studies on performance of a nonequilibrium disk MHD generator with radio-frequency preionization
Experimental studies on performance of a nonequilibrium disk MHD generator with radio-frequency preionization
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射频预电离非平衡盘磁流体发生器性能实验研究
DOI：
10.1109/tps.2003.808868
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发表时间：
2003
影响因子：
1.5
通讯作者：
H. Yamasaki
中科院分区：
文献类型：
--
作者：
T. Fujino;T. Murakami;Y. Okuno;H. Yamasaki
通过实验研究了外部施加射频电磁场（RF预电离）改善非平衡盘式磁流体动力（MHD）发电机性能的可能性。在2275(/spl plusmn/75) K和2650(/spl plusmn/50) K两种进气滞温条件下，采用激波管驱动的圆盘式MHD发电机进行了MHD发电实验，结果表明，在高、低滞温条件下，射频预电离均能提高输出功率。在入口停滞温度较低的情况下，等离子体不能仅通过自激电动势引起的焦耳加热来产生。在较高的进口停滞温度下，射频预电离改善了MHD通道内的等离子体状态，导致输出功率增加。在入口滞止温度较低的情况下，预电离对输出功率的显著提高不仅是因为施加射频电磁场触发了自激电动势的焦耳加热等离子体的产生，还因为射频电磁场的焦耳加热在MHD通道的更上游区域产生了高导电性的等离子体。
The possibility of the improvement in performance of a nonequilibrium disk magnetohydrodynamics (MHD) generator by externally applying a radio frequency (RF) electromagnetic field (RF preionization) was examined experimentally. The MHD power generation experiments were carried out using a shock-tube driven disk MHD generator with the RF induction coils for the two inlet stagnation temperatures of 2275(/spl plusmn/75) K and 2650(/spl plusmn/50) K. As a result, under the conditions of both high and low stagnation temperatures, the output power was increased by the RF preionization. The increase was markedly observed for the low inlet stagnation temperature, where the plasma could not be produced only by the Joule heating attributed to a self-excited electromotive force. For the high inlet stagnation temperature, the plasma state in the MHD channel was improved by the RF preionization, leading to the increase in the output power. For the low inlet stagnation temperature, the marked increase in the output power by the preionization was not only because applying the RF electromagnetic field triggered the plasma production by the Joule heating attributed to a self-excited electromotive force but also because the plasma with the high electrical conductivity was produced in the more upstream region of MHD channel by the Joule heating attributed to the RF electromagnetic field.