Experiments on High-Efficiency MHD Generation without Alkali Metal Seed

2002年，我们准备了测量和数据采集系统，以便在激波管设备上进行驱动实验。首先，对提片进行了初步实验，了解了提片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。在本研究项目中，将测量的随时间变化的压力迹线与基于cip -单调方案的模拟结果进行了比较。尽管两者之间存在细微的差异，但大致上符合得很好，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，目前对激波管装置的性能研究较少。为了准备激波管驱动MHD发电机的发电实验，我们开发了以激波管末端气体条件、随时间变化的滞止温度和滞止压力作为MHD发电机输入条件的数值模拟方案。我们发现发电机的性能取决于种子分数和负荷阻力，在出口马赫数接近1的条件下可以获得最高的性能。即使在种子分数和负荷不变的情况下，其性能也随进口条件的波动而波动。在这种情况下，出口马赫数为1时，输出性能最高。在圆盘发生器研究中，研究了采用混合惰性气体工质时的放电结构、等离子体稳定性和发生器性能。研究发现，工作等离子体的复合系数对发生器的性能和放电结构有很大的影响。

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.