Abstract
Experimental investigations were conducted in the 25-mm-bore ram accelerator using open-base projectiles, which were designed to obtain higher acceleration by reducing the mass. Single stage operations were conducted in a starting mixture, 2.8CH4+2O2+5.7N2. With a low entrance velocity, ram acceleration initiation delayed. The reliable start was obtained with an entrance velocity higher than 1.3 km/s. A maximum velocity of 2.3km/s was achieved through a 4-m-long ram acceleration section, where a ballistic efficiency higher than 0.1 was kept.
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