抄録
This study aims to design and experimental construct a small-scale supersonic/hypersonic ground test facility. The Ludwieg tube can generate calm flows with Mach and large Reynolds numbers corresponding to the real flight conditions, with sufficiently long duration for flow field settling and measurements, and without shocks and pressure disturbances. Its flow characteristics are predicted by quasi-one-dimensional analysis, and several design points are selected. Its primary components, such as high-pressure reservoir tubes, a high-speed opening valve, and contoured nozzles, are designed, fabricated and assembled. In preliminary runs, moderately calm supersonic flows, overexpanded slightly, are realized. The steady-state pressure at the reservoir tubes agrees well with the theoretical value and the duration of the pressure plateau is about 50milliseconds.
