中文摘要：

利用基于激波风洞的磁流体动力技术实验系统，设计了超声速喷管和分段法拉第型试验段，选用合理的电场及磁场方案，开展了不同磁感应强度下的磁流体加速实验研究。当激波管高压段压力1．2MPa、低压段压力500Pa，电容充电电压为400V时，得到的主要实验结论如下：随着磁感应强度增大，加速通道电极间电压增加，电流降低，单个电极的输入功率降低，负载系数略有降低，电效率略有升高；当磁感应强度分别为0．5T、1T、1．5T时，#10电极处超声速气流的电导率分别约为181S／m、81S／m和50S／m，利用#20电极开路电压的方法评估出口速度增量分别约为16．1％、14．7％、14．3％。电导率对输入功率的影响较大，提高加速效果需要同时提高气流的电导率和通道的电效率。

英文摘要：

MHD acceleration technology is of great hope in application. In this paper, with a MHD experi-mental system based on shock tunnel being used, the supersonic nozzle and test section （segmented Fara-day accelerator） are designed as well as reasonable electric field and magnetic field facilities. Experiments under different magnetic induction are carried out. Under the conditions of 1. 1 MPa driver pressure, 500Pa driven pressure and 400 V capacitance voltage, some results are obtained as follows： With the in-crease of the magnetic field, the voltage at electrode pair # 10 rises, while the current is decreased, the in-put power and the load factor are decreased. When magnetic inductions are differently as 0.5 T, 1 T and 1.5 T, the conductivities of supersonic airflow are about 181 S/m, 81 S/m and 50 S/m respectively, and the increasing rates of outlet speed are estimated to be 16.1%, 14.7% and 14.3% by evaluation method of using open circuit voltage at electrode pair # 20. The conductivity of supersonic airflow has an important effect on acceleration, and both the enhancements in electric conductivity and in efficiency are simultane-ously needed to improve MHD acceleration.