The combustion light gas gun (CLGG) uses low molecular weight gas aspropellant to burn, expand and propel the projectile out of the barrel withhigher muzzle velocities. The launching principle of CLGG is different fromthat of solid propellant gun. In order to study the CLGG interior ballisticcharacteristics, the space behind the projectile is assumed to be composed ofburned region and unburned region, and then a quasi-dimensional two-zonecombustion model is developed. The experimental fitting formula is usedfor the laminar burning speed of premixed gases. The interior ballisticprocess of CLGG is numerically simulated which is charged with hydrogenand oxygen at low temperature and high pressure. The pressure andtemperature in the combustion chamber as well as projectile velocity aregained which are consistent well with the experiment data. The results showthat the quasi-dimensional two-zone combustion model is suitable forCLGG interior ballistic research.
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