Abstract
A two-stage light gas gun has been developed to accelerate a projectile to supersonic velocity. The first stage of the gas gun is filled with a combustible gas mixture. The second stage is filled with a light gas. A free piston is located between them to compress the light gas which accelerates the projectile. The performance of the gas gun was evaluated under various experimental conditions. The projectile velocity was measured using several magnetic detectors, We plan to use this gas gun in a ram accelerator. In order to visualize the flow field around a projectile, a two-dimensional projectile is used. Consequently, the launch tube of the gas gun has a rectangular bore.
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