Experiments on High-Efficiency MHD Generation without Alkali Metal Seed

2002年，我们一直在准备测量和数据采集系统，以便利用激波管装置进行驱动实验。首先对破裂盘进行了初步的实验研究，得到了破裂压力随膜数的变化规律。同时，利用压力传感器进行了气体压力的快速测量。将实测的随时间变化的压力轨迹与基于CIP-单调方案的模拟结果进行了比较，CIP-单调方案是在过去几年中开发的。尽管两者之间存在着细微的差异，但大体上是一致的，并且充分了解了由于条件变化而引起的动态特性。在数值模拟中，迄今为止，已经研究了激波管装置的行为。为了准备激波管驱动磁流体发电机的实验研究，本文以激波管端部气体条件、随时间变化的滞止温度和滞止压力为输入条件，建立了模拟发电机性能的数值计算方法。我们发现，发生器的性能取决于种子分数和负载电阻和最高的性能可以获得的条件下，出口马赫数接近1。研究还发现，即使在固定的种子分数和负荷，性能波动与进口条件的波动。在实验条件下，当出口马赫数为1时，等离子体的输出性能最好。在盘形发生器的研究中，对混合惰性气体工作介质下的放电结构、等离子体稳定性和发生器性能进行了研究。结果表明，发生器的性能和放电结构强烈依赖于工作等离子体的复合系数。

In 2002, we have been preparing measurement and data acquisition system in order to conduct drive experiment using shock-tube facility. At first, preliminary experiment for rapture disk have been carried out to know how rapture pressure changes with number of films. At the same time, fast measurement of gas pressure using pressure transducers was conducted. Measured time-dependent pressure traces were compared with simulation results based on CIP-Monotone Scheme which have been developed in the past years in this research program. In spite of slight discrepancy between them, roughly speaking, they agree well and dynamic characteristics owing to change of conditions are sufficiently known.In numerical simulation, so far, behavior of shock-tube facility has been studied. In order to prepare power generation experiments using MHD generator driven by shock-tube facility, we developed numerical scheme to simulate generator performance using gas conditions at the end of shock-tube, time dependent stagnation temperature and stagnation pressure as input conditions for an MHD generator. We found that generator performance depends on seed fraction and load resistance and the highest performance could be obtained for the conditions where exit Mach number is close to 1. It is also found that even at the constant seed fraction and load, performance fluctuated with the fluctuation of inlet conditions. In this case, output performance was highest with the exit Mach number of 1.In the disk generator study, discharge structure, plasma stability and generator performance have been studied when mixed inert gas working medium was used. It was found that generator performance and discharge structure depended strongly on recombination coefficient of working plasma.