1970•NASA STI Repository (National Aeronautics and Space Administration)Open access
Evaluation of a light-gas gun hypervelocity augmentation technique Final report
Run-Hang Teng
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Abstract
An analysis of the interior ballistics of a constant base-pressure (C BP) gun is made, relating t'he muzzle velocity to p~rtitlent initial conditions in the gun.The specific chamber volume history required for the CBP launch cycle and the method of approximating the chamber volume are presented.Fifty-two runs have been made with the light-gas gun at the Douglas Aerophysic Laboratory to verify the theory and to identHy the important parameter s which may affect its performance.The departlU'e of the CBP theory from the experimental results has been identified as the friction between the piston and the high pressure section walls.Four types of collapsible pistons have been developed to meet the requirements of the CBP launch cycle.The VII 4.4 Maximwn-Performance Launch-Cycle 4.4. 1 Ahuninwn Collapsing Mechanism 4.4. 2 Glass -Reinforced Epoxy (Scotchply) Collapsing-Mechanism 4.4.317-4 PH Stainl&ss-Steel Collapsing-Mechanism 4.4.4Variable Recessing-Rate Collapsing-Mechanism 4.
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