Abstract
In order to compare with future experiment, a numerical study was made on the performance of a two-stage light gas gun which has been installed in the Shock Wave Research Center of the Institute of Fluid Science, Tohoku University. The random choice method (RCM) was used for the numerical simulation. In this numerical scheme, effects of the wall friction, heat transfer and the head loss induced by rupturing of a diaphragm were taken into account. To determine the optimum performance of the two-stage light gas gun, computations were conducted for various combinations of the operation parameters such as amount of propellant, weight of heavy piston, initial helium gas pressure in a pump tube, diaphragm rupturing pressure, and the weight of the projectile etc. It was found that optimum performance exists and can be determined by the simulation. For example, the experimental muzzle velocity was 3.67 km/s whereas the calculated velocity was 3.62 km/s with 80 g of smokeless powder, a heavy piston of 1 kg, a 4g projectile, and a diaphragm rupturing pressure of 300 atm.
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