Complex Flow Field Characteristics inside Combustion Chamber During the Secondary Ignition Process of CTA
The flow field characteristics inside the combustion chamber during the secondary ignition process of a large caliber cased telescoped ammunition(CTA)is studied.A two-dimensional axisymmetric two-phase reacting flow model based on the Euler-Euler approach is used,combined with dynamic grid division theory and user-defined function technology,to numerically simulate the secondary ignition internal ballistic process of a 105 mm CTA armor-piercing projectile.The results show that the main charge bed is ignited after the rupture of combustible guide tube,and the gas converges in the bottom area of the projectile,forming local eddies.The intensity of the eddies gradually increases,and the temperature at the center of the eddies gradually increases.Under the action of gas phase force,the main charge bed is compressed axially and radially to the bottom area of the projectile,and then is dispersed by a large amount of gas into the entire combustion chamber.It is found that the maximum breech pressure during the secondary ignition process is 560 MPa,and the muzzle velocity reaches 1 650 m/s.
cased telescoped ammunitiontwo-phase reacting flowinternal ballisticsflow field characteristicnumerical simulation
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